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add AC_TRY_COMPILE
This commit is contained in:
David MacKenzie
parent
3a2b4f82cd
commit
8b9cd57886
19
NEWS
19
NEWS
@ -46,19 +46,20 @@ Major changes in release 2.0:
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* AC_CONFIG_AUX_DIR, AC_CANONICAL_SYSTEM, AC_CANONICAL_HOST, AC_LINK_FILES to
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support deciding unguessable features based on the host and target types.
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* AC_CONFIG_SUBDIRS to recursively configure a source tree.
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* AC_ARG_PROGRAM, which uses the options --program-prefix,
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* AC_ARG_PROGRAM to use the options --program-prefix,
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--program-suffix, and --program-transform-name to change the names
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of programs being installed.
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* AC_PREFIX_DEFAULT, to change the default prefix.
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* AC_CHECK_TYPE, which checks whether sys/types.h defines a given type.
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* AC_CHECK_LIB, which checks for a particular function in a library.
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* AC_PREFIX_DEFAULT to change the default prefix.
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* AC_TRY_COMPILE to compile a test program without linking it.
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* AC_CHECK_TYPE to check whether sys/types.h defines a given type.
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* AC_CHECK_LIB to check for a particular function in a library.
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* AC_MSG_CHECKING and AC_MSG_RESULT to print test results, on a single line,
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whether or not the test succeeds. They obsolete AC_CHECKING and AC_VERBOSE.
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* AC_SUBST_FILE, to insert one file into another.
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* AC_FUNC_MEMCMP, to check whether memcmp is 8-bit clean.
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* AC_FUNC_STRFTIME, to find strftime even if it's in -lintl.
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* AC_FUNC_GETMNTENT, to find getmntent even if it's in -lsun or -lseq.
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* AC_HEADER_SYS_WAIT, to check whether sys/wait.h is POSIX.1 compatible.
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* AC_SUBST_FILE to insert one file into another.
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* AC_FUNC_MEMCMP to check whether memcmp is 8-bit clean.
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* AC_FUNC_STRFTIME to find strftime even if it's in -lintl.
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* AC_FUNC_GETMNTENT to find getmntent even if it's in -lsun or -lseq.
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* AC_HEADER_SYS_WAIT to check whether sys/wait.h is POSIX.1 compatible.
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** Changed macros:
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* Many macros renamed systematically, but old names are accepted for
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39
acgeneral.m4
39
acgeneral.m4
@ -51,7 +51,7 @@ dnl
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divert(-1)dnl Throw away output until AC_INIT is called.
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changequote([, ])
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define(AC_ACVERSION, 1.124)
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define(AC_ACVERSION, 1.125)
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dnl Some old m4's don't support m4exit. But they provide
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dnl equivalent functionality by core dumping because of the
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@ -1008,6 +1008,7 @@ AC_DEFUN(AC_LANG_C,
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ac_ext=c
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# CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
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ac_cpp='$CPP $CPPFLAGS'
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ac_compile='${CC-cc} $CFLAGS $CPPFLAGS conftest.$ac_ext -c 1>&AC_FD_CC 2>&AC_FD_CC'
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ac_link='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext -o conftest $LIBS 1>&AC_FD_CC 2>&AC_FD_CC'
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])
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@ -1017,6 +1018,7 @@ AC_DEFUN(AC_LANG_CPLUSPLUS,
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ac_ext=C
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# CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
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ac_cpp='$CXXCPP $CPPFLAGS'
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ac_compile='${CXX-gcc} $CXXFLAGS $CPPFLAGS conftest.$ac_ext -c 1>&AC_FD_CC 2>&AC_FD_CC'
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ac_link='${CXX-gcc} $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext -o conftest $LIBS 1>&AC_FD_CC 2>&AC_FD_CC'
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])
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@ -1291,13 +1293,42 @@ rm -f conftest*
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])
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dnl ### Examining syntax
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dnl AC_TRY_COMPILE(INCLUDES, FUNCTION-BODY,
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dnl ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
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AC_DEFUN(AC_TRY_COMPILE,
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[cat > conftest.$ac_ext <<EOF
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dnl This sometimes fails to find confdefs.h, for some reason.
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dnl [#]line __oline__ "[$]0"
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[#]line __oline__ "configure"
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#include "confdefs.h"
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[$1]
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int main() { return 0; }
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int t() {
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[$2]
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; return 0; }
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EOF
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if eval $ac_compile; then
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ifelse([$3], , :, [rm -rf conftest*
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$3])
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ifelse([$4], , , [else
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rm -rf conftest*
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$4
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])dnl
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fi
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rm -f conftest*]
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)
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dnl ### Examining libraries
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dnl AC_COMPILE_CHECK(ECHO-TEXT, INCLUDES, FUNCTION-BODY,
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dnl ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
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AC_DEFUN(AC_COMPILE_CHECK,
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[AC_OBSOLETE([$0], [; instead use AC_TRY_LINK])dnl
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[AC_OBSOLETE([$0], [; instead use AC_TRY_COMPILE or AC_TRY_LINK])dnl
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ifelse([$1], , , [AC_CHECKING([for $1])
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])dnl
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AC_TRY_LINK([$2], [$3], [$4], [$5])dnl
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@ -1311,10 +1342,6 @@ dnl This sometimes fails to find confdefs.h, for some reason.
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dnl [#]line __oline__ "[$]0"
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[#]line __oline__ "configure"
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#include "confdefs.h"
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ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
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extern "C" void exit(int);
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#endif
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])dnl
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[$1]
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int main() { return 0; }
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int t() {
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@ -308,9 +308,10 @@ AC_DEFUN(AC_PROG_LEX,
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if test -z "$LEXLIB"
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then
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case "$LEX" in
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flex*) AC_CHECK_LIB(fl, main, LEXLIB="-lfl") ;;
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*) LEXLIB="-ll" ;;
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flex*) ac_lib=fl ;;
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*) ac_lib=l ;;
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esac
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AC_CHECK_LIB($ac_lib, main, LEXLIB="-l$ac_lib")
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fi
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AC_SUBST(LEXLIB)])
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@ -527,7 +528,7 @@ AC_DEFUN(AC_CHECK_HEADER_DIRENT,
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[ac_safe=`echo "$1" | tr './' '__'`
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AC_MSG_CHECKING([for $1 that defines DIR])
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AC_CACHE_VAL(ac_cv_header_dirent_$ac_safe,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <$1>], [DIR *dirp = 0;],
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eval "ac_cv_header_dirent_$ac_safe=yes",
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eval "ac_cv_header_dirent_$ac_safe=no")])dnl
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@ -615,7 +616,7 @@ fi
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AC_DEFUN(AC_DECL_SYS_SIGLIST,
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[AC_MSG_CHECKING([for sys_siglist declaration in signal.h or unistd.h])
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AC_CACHE_VAL(ac_cv_decl_sys_siglist,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <signal.h>
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/* NetBSD declares sys_siglist in unistd.h. */
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#ifdef HAVE_UNISTD_H
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@ -631,7 +632,7 @@ fi
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AC_DEFUN(AC_HEADER_SYS_WAIT,
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[AC_MSG_CHECKING([for sys/wait.h that is POSIX.1 compatible])
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AC_CACHE_VAL(ac_cv_header_sys_wait_h,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/wait.h>
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#ifndef WEXITSTATUS
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#define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
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@ -722,7 +723,7 @@ dnl Note that identifiers starting with SIG are reserved by ANSI C.
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AC_DEFUN(AC_TYPE_SIGNAL,
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[AC_MSG_CHECKING([return type of signal handlers])
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AC_CACHE_VAL(ac_cv_type_signal,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <signal.h>
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#ifdef signal
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#undef signal
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@ -1132,7 +1133,7 @@ AC_CHECK_HEADER(nlist.h,
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[AC_DEFINE(NLIST_STRUCT)
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AC_MSG_CHECKING([for n_un in struct nlist])
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AC_CACHE_VAL(ac_cv_struct_nlist_n_un,
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[AC_TRY_LINK([#include <nlist.h>],
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[AC_TRY_COMPILE([#include <nlist.h>],
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[struct nlist n; n.n_un.n_name = 0;],
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ac_cv_struct_nlist_n_un=yes, ac_cv_struct_nlist_n_un=no)])dnl
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AC_MSG_RESULT($ac_cv_struct_nlist_n_un)
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@ -1270,7 +1271,7 @@ dnl ### Checks for structure members
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AC_DEFUN(AC_HEADER_TIME,
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[AC_MSG_CHECKING([whether time.h and sys/time.h may both be included])
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AC_CACHE_VAL(ac_cv_header_time,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/time.h>
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#include <time.h>],
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[struct tm *tp;], ac_cv_header_time=yes, ac_cv_header_time=no)])dnl
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@ -1283,7 +1284,7 @@ fi
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AC_DEFUN(AC_STRUCT_TM,
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[AC_MSG_CHECKING([whether struct tm is in sys/time.h or time.h])
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AC_CACHE_VAL(ac_cv_struct_tm,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <time.h>],
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[struct tm *tp; tp->tm_sec;],
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ac_cv_struct_tm=time.h, ac_cv_struct_tm=sys/time.h)])dnl
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@ -1297,7 +1298,7 @@ AC_DEFUN(AC_STRUCT_TIMEZONE,
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[AC_REQUIRE([AC_STRUCT_TM])dnl
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AC_MSG_CHECKING([for tm_zone in struct tm])
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AC_CACHE_VAL(ac_cv_struct_tm_zone,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <$ac_cv_struct_tm>], [struct tm tm; tm.tm_zone;],
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ac_cv_struct_tm_zone=yes, ac_cv_struct_tm_zone=no)])dnl
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AC_MSG_RESULT($ac_cv_struct_tm_zone)
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@ -1324,7 +1325,7 @@ fi
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AC_DEFUN(AC_STRUCT_ST_BLOCKS,
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[AC_MSG_CHECKING([for st_blocks in struct stat])
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AC_CACHE_VAL(ac_cv_struct_st_blocks,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/stat.h>], [struct stat s; s.st_blocks;],
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ac_cv_struct_st_blocks=yes, ac_cv_struct_st_blocks=no)])dnl
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AC_MSG_RESULT($ac_cv_struct_st_blocks)
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@ -1339,7 +1340,7 @@ AC_SUBST(LIBOBJS)dnl
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AC_DEFUN(AC_STRUCT_ST_BLKSIZE,
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[AC_MSG_CHECKING([for st_blksize in struct stat])
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AC_CACHE_VAL(ac_cv_struct_st_blksize,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/stat.h>], [struct stat s; s.st_blksize;],
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ac_cv_struct_st_blksize=yes, ac_cv_struct_st_blksize=no)])dnl
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AC_MSG_RESULT($ac_cv_struct_st_blksize)
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@ -1351,7 +1352,7 @@ fi
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AC_DEFUN(AC_STRUCT_ST_RDEV,
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[AC_MSG_CHECKING([for st_rdev in struct stat])
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AC_CACHE_VAL(ac_cv_struct_st_rdev,
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[AC_TRY_LINK([#include <sys/types.h>
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[AC_TRY_COMPILE([#include <sys/types.h>
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#include <sys/stat.h>], [struct stat s; s.st_rdev;],
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ac_cv_struct_st_rdev=yes, ac_cv_struct_st_rdev=no)])dnl
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AC_MSG_RESULT($ac_cv_struct_st_rdev)
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@ -1458,7 +1459,7 @@ AC_DEFUN(AC_C_INLINE,
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[AC_MSG_CHECKING([for inline])
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AC_CACHE_VAL(ac_cv_c_inline,
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[if test "$GCC" = yes; then
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AC_TRY_LINK(, [} inline foo() {], ac_cv_c_inline=yes, ac_cv_c_inline=no)
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AC_TRY_COMPILE(, [} inline foo() {], ac_cv_c_inline=yes, ac_cv_c_inline=no)
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else
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ac_cv_c_inline=no
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fi])dnl
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@ -1473,7 +1474,7 @@ AC_DEFUN(AC_C_CONST,
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dnl and with the result message.
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AC_MSG_CHECKING([for working const])
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AC_CACHE_VAL(ac_cv_c_const,
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[AC_TRY_LINK(,
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[AC_TRY_COMPILE(,
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changequote(<<, >>)dnl
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<<
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/* Ultrix mips cc rejects this. */
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@ -1870,7 +1871,8 @@ dnl These are kludges which should be replaced by a single POSIX check.
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AC_DEFUN(AC_AIX,
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[AC_BEFORE([$0], [AC_TRY_LINK])dnl
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[AC_BEFORE([$0], [AC_TRY_COMPILE])dnl
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AC_BEFORE([$0], [AC_TRY_LINK])dnl
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AC_BEFORE([$0], [AC_TRY_RUN])dnl
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AC_MSG_CHECKING(for AIX)
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AC_EGREP_CPP(yes,
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@ -1881,7 +1883,8 @@ AC_EGREP_CPP(yes,
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])
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AC_DEFUN(AC_MINIX,
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[AC_BEFORE([$0], [AC_TRY_LINK])dnl
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[AC_BEFORE([$0], [AC_TRY_COMPILE])dnl
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AC_BEFORE([$0], [AC_TRY_LINK])dnl
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AC_BEFORE([$0], [AC_TRY_RUN])dnl
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AC_CHECK_HEADER(minix/config.h, MINIX=yes, MINIX=)
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if test "$MINIX" = yes; then
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@ -1893,6 +1896,7 @@ fi
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AC_DEFUN(AC_ISC_POSIX,
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[AC_BEFORE([$0], [AC_TRY_LINK])dnl
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AC_BEFORE([$0], [AC_TRY_LINK])dnl
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AC_BEFORE([$0], [AC_TRY_RUN])dnl
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AC_MSG_CHECKING(for POSIXized ISC)
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if test -d /etc/conf/kconfig.d &&
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@ -6,8 +6,8 @@
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@c @setchapternewpage odd
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@c %**end of header
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@set EDITION 1.124
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@set VERSION 1.124
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@set EDITION 1.125
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@set VERSION 1.125
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@set UPDATED October 1994
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@iftex
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@ -184,6 +184,7 @@ Typedefs
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Writing Tests
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* Examining Declarations:: Detecting header files and declarations.
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* Examining Syntax:: Detecting language syntax features.
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* Examining Libraries:: Detecting functions and global variables.
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* Run Time:: Testing for run-time features.
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* Portable Shell:: Shell script portability pitfalls.
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@ -490,14 +491,18 @@ checks for system services
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When calling macros that take arguments, there must not be any blank
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space between the macro name and the open parenthesis. Arguments can be
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more than one line long if they are enclosed within the @code{m4} quote
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characters @samp{[} and @samp{]}. Some macros handle two cases: what
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to do if the given condition is met, and what to do if the condition is
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not met. In some places you might want to do something if a
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condition is true but do nothing if it's false, or vice versa. To omit
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the true case, pass an empty value for the @var{action-if-found}
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argument to the macro. To omit the false case, omit the
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@var{action-if-not-found} argument to the macro, including the comma
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before it.
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characters @samp{[} and @samp{]}. If you have a long line such as a
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list of file names, you can generally use a backslash at the end of a
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line to continue it logically on the next line (this is implemented by
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the shell, not by anything special that Autoconf does).
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Some macros handle two cases: what to do if the given condition is met,
|
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and what to do if the condition is not met. In some places you might
|
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want to do something if a condition is true but do nothing if it's
|
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false, or vice versa. To omit the true case, pass an empty value for
|
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the @var{action-if-found} argument to the macro. To omit the false
|
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case, omit the @var{action-if-not-found} argument to the macro,
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including the comma before it.
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You can include comments in @file{configure.in} files by starting them
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with the @code{m4} builtin macro @code{dnl}, which discards text up
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@ -2146,9 +2151,9 @@ is executed when one of the header files is not found.
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@section Structures
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The following macros check for certain structures or structure members.
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To check structures not listed here, you can use @code{AC_EGREP_CPP}
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(@pxref{Examining Declarations}) or @code{AC_TRY_LINK} (@pxref{Examining
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Libraries})
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To check structures not listed here, use @code{AC_EGREP_CPP}
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(@pxref{Examining Declarations}) or @code{AC_TRY_COMPILE}
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(@pxref{Examining Syntax}).
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@defmac AC_HEADER_STAT
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@maindex HEADER_STAT
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@ -2326,9 +2331,9 @@ builtin type @var{default}; e.g., @samp{short} or @samp{unsigned}.
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@section Compiler Characteristics
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The following macros check for C compiler or machine architecture
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features. You can use @code{AC_TRY_LINK} (@pxref{Examining Libraries})
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or @code{AC_TRY_RUN} (@pxref{Run Time}) to check for
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characteristics not listed here.
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features. To check for characteristics not listed here, use
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@code{AC_TRY_COMPILE} (@pxref{Examining Syntax}) or @code{AC_TRY_RUN}
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(@pxref{Run Time})
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@defmac AC_C_BIGENDIAN
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@maindex C_BIGENDIAN
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@ -2560,6 +2565,7 @@ about what they're checking for.
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@menu
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* Examining Declarations:: Detecting header files and declarations.
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* Examining Syntax:: Detecting language syntax features.
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* Examining Libraries:: Detecting functions and global variables.
|
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* Run Time:: Testing for run-time features.
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* Portable Shell:: Shell script portability pitfalls.
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@ -2568,7 +2574,7 @@ about what they're checking for.
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* Language Choice:: Selecting which language to use for testing.
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@end menu
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@node Examining Declarations, Examining Libraries, , Writing Tests
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@node Examining Declarations, Examining Syntax, , Writing Tests
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@section Examining Declarations
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The macro @code{AC_TRY_CPP} is used to check whether particular header
|
||||
@ -2628,7 +2634,27 @@ on which language is current, @pxref{Language Choice}), if it hasn't
|
||||
been called already.
|
||||
@end defmac
|
||||
|
||||
@node Examining Libraries, Run Time, Examining Declarations, Writing Tests
|
||||
@node Examining Syntax, Examining Libraries, Examining Declarations, Writing Tests
|
||||
@section Examining Syntax
|
||||
|
||||
To check for a syntax feature of the C or C++ compiler, such as whether
|
||||
it recognizes a certain keyword, use @code{AC_TRY_COMPILE} to try to
|
||||
compile a small program that uses that feature. You can also use it to
|
||||
check for structures and structure members that are not present on all
|
||||
systems.
|
||||
|
||||
@defmac AC_TRY_COMPILE (@var{includes}, @var{function-body}, @var{action-if-found} @r{[}, @var{action-if-not-found}@r{]})
|
||||
@maindex TRY_COMPILE
|
||||
Create a test C program to see whether a function whose body consists of
|
||||
@var{function-body} can be compiled; @var{includes} is any
|
||||
@code{#include} statements needed by the code in @var{function-body}.
|
||||
If the file compiles successfully, run shell commands
|
||||
@var{action-if-found}, otherwise run @var{action-if-not-found}. This
|
||||
macro uses @code{CFLAGS} or @code{CXXFLAGS}, and @code{CPPFLAGS}, when
|
||||
compiling.
|
||||
@end defmac
|
||||
|
||||
@node Examining Libraries, Run Time, Examining Syntax, Writing Tests
|
||||
@section Examining Libraries
|
||||
|
||||
To check for a library, a function, or a global variable, Autoconf
|
||||
@ -2649,12 +2675,11 @@ However, some of them can be given options that make the exit status
|
||||
correct. This is a problem that Autoconf does not currently handle
|
||||
automatically.
|
||||
|
||||
The below macro is used to compile test programs to test for functions
|
||||
and global variables. It is also used to check for libraries, by adding
|
||||
the library being checked for to @code{LIBS} temporarily and trying to
|
||||
link a small program. And it is used to check matters of C syntax, such
|
||||
as whether a particular keyword is recognized---a test program using a
|
||||
keyword does not compile on systems that don't support it.
|
||||
@code{AC_TRY_LINK} is used to compile test programs to test for
|
||||
functions and global variables. It is also used (by
|
||||
@code{AC_CHECK_LIB}) to check for libraries, by adding the library being
|
||||
checked for to @code{LIBS} temporarily and trying to link a small
|
||||
program.
|
||||
|
||||
@defmac AC_TRY_LINK (@var{includes}, @var{function-body}, @var{action-if-found} @r{[}, @var{action-if-not-found}@r{]})
|
||||
@maindex TRY_LINK
|
||||
@ -3094,13 +3119,14 @@ newlines.
|
||||
|
||||
@defmac AC_SUBST_FILE (@var{variable})
|
||||
@maindex SUBST_FILE
|
||||
Another way to create an output variable from a shell variable.
|
||||
Make @code{AC_OUTPUT} substitute the contents of the file named by shell
|
||||
Another way to create an output variable from a shell variable. Make
|
||||
@code{AC_OUTPUT} substitute the contents of the file named by shell
|
||||
variable @var{variable} into output files (typically one or more
|
||||
@file{Makefile}s). This means that @code{AC_OUTPUT} will replace
|
||||
instances of @samp{@@@var{variable}@@} in the @file{Makefile.in} files
|
||||
with the contents of the file that the shell variable @var{variable}
|
||||
names when @code{AC_OUTPUT} is called.
|
||||
names when @code{AC_OUTPUT} is called. Set the variable to
|
||||
@file{/dev/null} for cases which do not have a file to insert.
|
||||
|
||||
This macro is useful for inserting @file{Makefile} fragments containing
|
||||
special dependencies or other @code{make} directives for particular host
|
||||
|
||||
@ -6,8 +6,8 @@
|
||||
@c @setchapternewpage odd
|
||||
@c %**end of header
|
||||
|
||||
@set EDITION 1.124
|
||||
@set VERSION 1.124
|
||||
@set EDITION 1.125
|
||||
@set VERSION 1.125
|
||||
@set UPDATED October 1994
|
||||
|
||||
@iftex
|
||||
@ -184,6 +184,7 @@ Typedefs
|
||||
Writing Tests
|
||||
|
||||
* Examining Declarations:: Detecting header files and declarations.
|
||||
* Examining Syntax:: Detecting language syntax features.
|
||||
* Examining Libraries:: Detecting functions and global variables.
|
||||
* Run Time:: Testing for run-time features.
|
||||
* Portable Shell:: Shell script portability pitfalls.
|
||||
@ -490,14 +491,18 @@ checks for system services
|
||||
When calling macros that take arguments, there must not be any blank
|
||||
space between the macro name and the open parenthesis. Arguments can be
|
||||
more than one line long if they are enclosed within the @code{m4} quote
|
||||
characters @samp{[} and @samp{]}. Some macros handle two cases: what
|
||||
to do if the given condition is met, and what to do if the condition is
|
||||
not met. In some places you might want to do something if a
|
||||
condition is true but do nothing if it's false, or vice versa. To omit
|
||||
the true case, pass an empty value for the @var{action-if-found}
|
||||
argument to the macro. To omit the false case, omit the
|
||||
@var{action-if-not-found} argument to the macro, including the comma
|
||||
before it.
|
||||
characters @samp{[} and @samp{]}. If you have a long line such as a
|
||||
list of file names, you can generally use a backslash at the end of a
|
||||
line to continue it logically on the next line (this is implemented by
|
||||
the shell, not by anything special that Autoconf does).
|
||||
|
||||
Some macros handle two cases: what to do if the given condition is met,
|
||||
and what to do if the condition is not met. In some places you might
|
||||
want to do something if a condition is true but do nothing if it's
|
||||
false, or vice versa. To omit the true case, pass an empty value for
|
||||
the @var{action-if-found} argument to the macro. To omit the false
|
||||
case, omit the @var{action-if-not-found} argument to the macro,
|
||||
including the comma before it.
|
||||
|
||||
You can include comments in @file{configure.in} files by starting them
|
||||
with the @code{m4} builtin macro @code{dnl}, which discards text up
|
||||
@ -2146,9 +2151,9 @@ is executed when one of the header files is not found.
|
||||
@section Structures
|
||||
|
||||
The following macros check for certain structures or structure members.
|
||||
To check structures not listed here, you can use @code{AC_EGREP_CPP}
|
||||
(@pxref{Examining Declarations}) or @code{AC_TRY_LINK} (@pxref{Examining
|
||||
Libraries})
|
||||
To check structures not listed here, use @code{AC_EGREP_CPP}
|
||||
(@pxref{Examining Declarations}) or @code{AC_TRY_COMPILE}
|
||||
(@pxref{Examining Syntax}).
|
||||
|
||||
@defmac AC_HEADER_STAT
|
||||
@maindex HEADER_STAT
|
||||
@ -2326,9 +2331,9 @@ builtin type @var{default}; e.g., @samp{short} or @samp{unsigned}.
|
||||
@section Compiler Characteristics
|
||||
|
||||
The following macros check for C compiler or machine architecture
|
||||
features. You can use @code{AC_TRY_LINK} (@pxref{Examining Libraries})
|
||||
or @code{AC_TRY_RUN} (@pxref{Run Time}) to check for
|
||||
characteristics not listed here.
|
||||
features. To check for characteristics not listed here, use
|
||||
@code{AC_TRY_COMPILE} (@pxref{Examining Syntax}) or @code{AC_TRY_RUN}
|
||||
(@pxref{Run Time})
|
||||
|
||||
@defmac AC_C_BIGENDIAN
|
||||
@maindex C_BIGENDIAN
|
||||
@ -2560,6 +2565,7 @@ about what they're checking for.
|
||||
|
||||
@menu
|
||||
* Examining Declarations:: Detecting header files and declarations.
|
||||
* Examining Syntax:: Detecting language syntax features.
|
||||
* Examining Libraries:: Detecting functions and global variables.
|
||||
* Run Time:: Testing for run-time features.
|
||||
* Portable Shell:: Shell script portability pitfalls.
|
||||
@ -2568,7 +2574,7 @@ about what they're checking for.
|
||||
* Language Choice:: Selecting which language to use for testing.
|
||||
@end menu
|
||||
|
||||
@node Examining Declarations, Examining Libraries, , Writing Tests
|
||||
@node Examining Declarations, Examining Syntax, , Writing Tests
|
||||
@section Examining Declarations
|
||||
|
||||
The macro @code{AC_TRY_CPP} is used to check whether particular header
|
||||
@ -2628,7 +2634,27 @@ on which language is current, @pxref{Language Choice}), if it hasn't
|
||||
been called already.
|
||||
@end defmac
|
||||
|
||||
@node Examining Libraries, Run Time, Examining Declarations, Writing Tests
|
||||
@node Examining Syntax, Examining Libraries, Examining Declarations, Writing Tests
|
||||
@section Examining Syntax
|
||||
|
||||
To check for a syntax feature of the C or C++ compiler, such as whether
|
||||
it recognizes a certain keyword, use @code{AC_TRY_COMPILE} to try to
|
||||
compile a small program that uses that feature. You can also use it to
|
||||
check for structures and structure members that are not present on all
|
||||
systems.
|
||||
|
||||
@defmac AC_TRY_COMPILE (@var{includes}, @var{function-body}, @var{action-if-found} @r{[}, @var{action-if-not-found}@r{]})
|
||||
@maindex TRY_COMPILE
|
||||
Create a test C program to see whether a function whose body consists of
|
||||
@var{function-body} can be compiled; @var{includes} is any
|
||||
@code{#include} statements needed by the code in @var{function-body}.
|
||||
If the file compiles successfully, run shell commands
|
||||
@var{action-if-found}, otherwise run @var{action-if-not-found}. This
|
||||
macro uses @code{CFLAGS} or @code{CXXFLAGS}, and @code{CPPFLAGS}, when
|
||||
compiling.
|
||||
@end defmac
|
||||
|
||||
@node Examining Libraries, Run Time, Examining Syntax, Writing Tests
|
||||
@section Examining Libraries
|
||||
|
||||
To check for a library, a function, or a global variable, Autoconf
|
||||
@ -2649,12 +2675,11 @@ However, some of them can be given options that make the exit status
|
||||
correct. This is a problem that Autoconf does not currently handle
|
||||
automatically.
|
||||
|
||||
The below macro is used to compile test programs to test for functions
|
||||
and global variables. It is also used to check for libraries, by adding
|
||||
the library being checked for to @code{LIBS} temporarily and trying to
|
||||
link a small program. And it is used to check matters of C syntax, such
|
||||
as whether a particular keyword is recognized---a test program using a
|
||||
keyword does not compile on systems that don't support it.
|
||||
@code{AC_TRY_LINK} is used to compile test programs to test for
|
||||
functions and global variables. It is also used (by
|
||||
@code{AC_CHECK_LIB}) to check for libraries, by adding the library being
|
||||
checked for to @code{LIBS} temporarily and trying to link a small
|
||||
program.
|
||||
|
||||
@defmac AC_TRY_LINK (@var{includes}, @var{function-body}, @var{action-if-found} @r{[}, @var{action-if-not-found}@r{]})
|
||||
@maindex TRY_LINK
|
||||
@ -3094,13 +3119,14 @@ newlines.
|
||||
|
||||
@defmac AC_SUBST_FILE (@var{variable})
|
||||
@maindex SUBST_FILE
|
||||
Another way to create an output variable from a shell variable.
|
||||
Make @code{AC_OUTPUT} substitute the contents of the file named by shell
|
||||
Another way to create an output variable from a shell variable. Make
|
||||
@code{AC_OUTPUT} substitute the contents of the file named by shell
|
||||
variable @var{variable} into output files (typically one or more
|
||||
@file{Makefile}s). This means that @code{AC_OUTPUT} will replace
|
||||
instances of @samp{@@@var{variable}@@} in the @file{Makefile.in} files
|
||||
with the contents of the file that the shell variable @var{variable}
|
||||
names when @code{AC_OUTPUT} is called.
|
||||
names when @code{AC_OUTPUT} is called. Set the variable to
|
||||
@file{/dev/null} for cases which do not have a file to insert.
|
||||
|
||||
This macro is useful for inserting @file{Makefile} fragments containing
|
||||
special dependencies or other @code{make} directives for particular host
|
||||
|
||||
@ -51,7 +51,7 @@ dnl
|
||||
divert(-1)dnl Throw away output until AC_INIT is called.
|
||||
changequote([, ])
|
||||
|
||||
define(AC_ACVERSION, 1.124)
|
||||
define(AC_ACVERSION, 1.125)
|
||||
|
||||
dnl Some old m4's don't support m4exit. But they provide
|
||||
dnl equivalent functionality by core dumping because of the
|
||||
@ -1008,6 +1008,7 @@ AC_DEFUN(AC_LANG_C,
|
||||
ac_ext=c
|
||||
# CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
|
||||
ac_cpp='$CPP $CPPFLAGS'
|
||||
ac_compile='${CC-cc} $CFLAGS $CPPFLAGS conftest.$ac_ext -c 1>&AC_FD_CC 2>&AC_FD_CC'
|
||||
ac_link='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext -o conftest $LIBS 1>&AC_FD_CC 2>&AC_FD_CC'
|
||||
])
|
||||
|
||||
@ -1017,6 +1018,7 @@ AC_DEFUN(AC_LANG_CPLUSPLUS,
|
||||
ac_ext=C
|
||||
# CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
|
||||
ac_cpp='$CXXCPP $CPPFLAGS'
|
||||
ac_compile='${CXX-gcc} $CXXFLAGS $CPPFLAGS conftest.$ac_ext -c 1>&AC_FD_CC 2>&AC_FD_CC'
|
||||
ac_link='${CXX-gcc} $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext -o conftest $LIBS 1>&AC_FD_CC 2>&AC_FD_CC'
|
||||
])
|
||||
|
||||
@ -1291,13 +1293,42 @@ rm -f conftest*
|
||||
])
|
||||
|
||||
|
||||
dnl ### Examining syntax
|
||||
|
||||
|
||||
dnl AC_TRY_COMPILE(INCLUDES, FUNCTION-BODY,
|
||||
dnl ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
|
||||
AC_DEFUN(AC_TRY_COMPILE,
|
||||
[cat > conftest.$ac_ext <<EOF
|
||||
dnl This sometimes fails to find confdefs.h, for some reason.
|
||||
dnl [#]line __oline__ "[$]0"
|
||||
[#]line __oline__ "configure"
|
||||
#include "confdefs.h"
|
||||
[$1]
|
||||
int main() { return 0; }
|
||||
int t() {
|
||||
[$2]
|
||||
; return 0; }
|
||||
EOF
|
||||
if eval $ac_compile; then
|
||||
ifelse([$3], , :, [rm -rf conftest*
|
||||
$3])
|
||||
ifelse([$4], , , [else
|
||||
rm -rf conftest*
|
||||
$4
|
||||
])dnl
|
||||
fi
|
||||
rm -f conftest*]
|
||||
)
|
||||
|
||||
|
||||
dnl ### Examining libraries
|
||||
|
||||
|
||||
dnl AC_COMPILE_CHECK(ECHO-TEXT, INCLUDES, FUNCTION-BODY,
|
||||
dnl ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND])
|
||||
AC_DEFUN(AC_COMPILE_CHECK,
|
||||
[AC_OBSOLETE([$0], [; instead use AC_TRY_LINK])dnl
|
||||
[AC_OBSOLETE([$0], [; instead use AC_TRY_COMPILE or AC_TRY_LINK])dnl
|
||||
ifelse([$1], , , [AC_CHECKING([for $1])
|
||||
])dnl
|
||||
AC_TRY_LINK([$2], [$3], [$4], [$5])dnl
|
||||
@ -1311,10 +1342,6 @@ dnl This sometimes fails to find confdefs.h, for some reason.
|
||||
dnl [#]line __oline__ "[$]0"
|
||||
[#]line __oline__ "configure"
|
||||
#include "confdefs.h"
|
||||
ifelse(AC_LANG, CPLUSPLUS, [#ifdef __cplusplus
|
||||
extern "C" void exit(int);
|
||||
#endif
|
||||
])dnl
|
||||
[$1]
|
||||
int main() { return 0; }
|
||||
int t() {
|
||||
|
||||
@ -308,9 +308,10 @@ AC_DEFUN(AC_PROG_LEX,
|
||||
if test -z "$LEXLIB"
|
||||
then
|
||||
case "$LEX" in
|
||||
flex*) AC_CHECK_LIB(fl, main, LEXLIB="-lfl") ;;
|
||||
*) LEXLIB="-ll" ;;
|
||||
flex*) ac_lib=fl ;;
|
||||
*) ac_lib=l ;;
|
||||
esac
|
||||
AC_CHECK_LIB($ac_lib, main, LEXLIB="-l$ac_lib")
|
||||
fi
|
||||
AC_SUBST(LEXLIB)])
|
||||
|
||||
@ -527,7 +528,7 @@ AC_DEFUN(AC_CHECK_HEADER_DIRENT,
|
||||
[ac_safe=`echo "$1" | tr './' '__'`
|
||||
AC_MSG_CHECKING([for $1 that defines DIR])
|
||||
AC_CACHE_VAL(ac_cv_header_dirent_$ac_safe,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <$1>], [DIR *dirp = 0;],
|
||||
eval "ac_cv_header_dirent_$ac_safe=yes",
|
||||
eval "ac_cv_header_dirent_$ac_safe=no")])dnl
|
||||
@ -615,7 +616,7 @@ fi
|
||||
AC_DEFUN(AC_DECL_SYS_SIGLIST,
|
||||
[AC_MSG_CHECKING([for sys_siglist declaration in signal.h or unistd.h])
|
||||
AC_CACHE_VAL(ac_cv_decl_sys_siglist,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <signal.h>
|
||||
/* NetBSD declares sys_siglist in unistd.h. */
|
||||
#ifdef HAVE_UNISTD_H
|
||||
@ -631,7 +632,7 @@ fi
|
||||
AC_DEFUN(AC_HEADER_SYS_WAIT,
|
||||
[AC_MSG_CHECKING([for sys/wait.h that is POSIX.1 compatible])
|
||||
AC_CACHE_VAL(ac_cv_header_sys_wait_h,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <sys/wait.h>
|
||||
#ifndef WEXITSTATUS
|
||||
#define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
|
||||
@ -722,7 +723,7 @@ dnl Note that identifiers starting with SIG are reserved by ANSI C.
|
||||
AC_DEFUN(AC_TYPE_SIGNAL,
|
||||
[AC_MSG_CHECKING([return type of signal handlers])
|
||||
AC_CACHE_VAL(ac_cv_type_signal,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <signal.h>
|
||||
#ifdef signal
|
||||
#undef signal
|
||||
@ -1132,7 +1133,7 @@ AC_CHECK_HEADER(nlist.h,
|
||||
[AC_DEFINE(NLIST_STRUCT)
|
||||
AC_MSG_CHECKING([for n_un in struct nlist])
|
||||
AC_CACHE_VAL(ac_cv_struct_nlist_n_un,
|
||||
[AC_TRY_LINK([#include <nlist.h>],
|
||||
[AC_TRY_COMPILE([#include <nlist.h>],
|
||||
[struct nlist n; n.n_un.n_name = 0;],
|
||||
ac_cv_struct_nlist_n_un=yes, ac_cv_struct_nlist_n_un=no)])dnl
|
||||
AC_MSG_RESULT($ac_cv_struct_nlist_n_un)
|
||||
@ -1270,7 +1271,7 @@ dnl ### Checks for structure members
|
||||
AC_DEFUN(AC_HEADER_TIME,
|
||||
[AC_MSG_CHECKING([whether time.h and sys/time.h may both be included])
|
||||
AC_CACHE_VAL(ac_cv_header_time,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <sys/time.h>
|
||||
#include <time.h>],
|
||||
[struct tm *tp;], ac_cv_header_time=yes, ac_cv_header_time=no)])dnl
|
||||
@ -1283,7 +1284,7 @@ fi
|
||||
AC_DEFUN(AC_STRUCT_TM,
|
||||
[AC_MSG_CHECKING([whether struct tm is in sys/time.h or time.h])
|
||||
AC_CACHE_VAL(ac_cv_struct_tm,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <time.h>],
|
||||
[struct tm *tp; tp->tm_sec;],
|
||||
ac_cv_struct_tm=time.h, ac_cv_struct_tm=sys/time.h)])dnl
|
||||
@ -1297,7 +1298,7 @@ AC_DEFUN(AC_STRUCT_TIMEZONE,
|
||||
[AC_REQUIRE([AC_STRUCT_TM])dnl
|
||||
AC_MSG_CHECKING([for tm_zone in struct tm])
|
||||
AC_CACHE_VAL(ac_cv_struct_tm_zone,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <$ac_cv_struct_tm>], [struct tm tm; tm.tm_zone;],
|
||||
ac_cv_struct_tm_zone=yes, ac_cv_struct_tm_zone=no)])dnl
|
||||
AC_MSG_RESULT($ac_cv_struct_tm_zone)
|
||||
@ -1324,7 +1325,7 @@ fi
|
||||
AC_DEFUN(AC_STRUCT_ST_BLOCKS,
|
||||
[AC_MSG_CHECKING([for st_blocks in struct stat])
|
||||
AC_CACHE_VAL(ac_cv_struct_st_blocks,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <sys/stat.h>], [struct stat s; s.st_blocks;],
|
||||
ac_cv_struct_st_blocks=yes, ac_cv_struct_st_blocks=no)])dnl
|
||||
AC_MSG_RESULT($ac_cv_struct_st_blocks)
|
||||
@ -1339,7 +1340,7 @@ AC_SUBST(LIBOBJS)dnl
|
||||
AC_DEFUN(AC_STRUCT_ST_BLKSIZE,
|
||||
[AC_MSG_CHECKING([for st_blksize in struct stat])
|
||||
AC_CACHE_VAL(ac_cv_struct_st_blksize,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <sys/stat.h>], [struct stat s; s.st_blksize;],
|
||||
ac_cv_struct_st_blksize=yes, ac_cv_struct_st_blksize=no)])dnl
|
||||
AC_MSG_RESULT($ac_cv_struct_st_blksize)
|
||||
@ -1351,7 +1352,7 @@ fi
|
||||
AC_DEFUN(AC_STRUCT_ST_RDEV,
|
||||
[AC_MSG_CHECKING([for st_rdev in struct stat])
|
||||
AC_CACHE_VAL(ac_cv_struct_st_rdev,
|
||||
[AC_TRY_LINK([#include <sys/types.h>
|
||||
[AC_TRY_COMPILE([#include <sys/types.h>
|
||||
#include <sys/stat.h>], [struct stat s; s.st_rdev;],
|
||||
ac_cv_struct_st_rdev=yes, ac_cv_struct_st_rdev=no)])dnl
|
||||
AC_MSG_RESULT($ac_cv_struct_st_rdev)
|
||||
@ -1458,7 +1459,7 @@ AC_DEFUN(AC_C_INLINE,
|
||||
[AC_MSG_CHECKING([for inline])
|
||||
AC_CACHE_VAL(ac_cv_c_inline,
|
||||
[if test "$GCC" = yes; then
|
||||
AC_TRY_LINK(, [} inline foo() {], ac_cv_c_inline=yes, ac_cv_c_inline=no)
|
||||
AC_TRY_COMPILE(, [} inline foo() {], ac_cv_c_inline=yes, ac_cv_c_inline=no)
|
||||
else
|
||||
ac_cv_c_inline=no
|
||||
fi])dnl
|
||||
@ -1473,7 +1474,7 @@ AC_DEFUN(AC_C_CONST,
|
||||
dnl and with the result message.
|
||||
AC_MSG_CHECKING([for working const])
|
||||
AC_CACHE_VAL(ac_cv_c_const,
|
||||
[AC_TRY_LINK(,
|
||||
[AC_TRY_COMPILE(,
|
||||
changequote(<<, >>)dnl
|
||||
<<
|
||||
/* Ultrix mips cc rejects this. */
|
||||
@ -1870,7 +1871,8 @@ dnl These are kludges which should be replaced by a single POSIX check.
|
||||
|
||||
|
||||
AC_DEFUN(AC_AIX,
|
||||
[AC_BEFORE([$0], [AC_TRY_LINK])dnl
|
||||
[AC_BEFORE([$0], [AC_TRY_COMPILE])dnl
|
||||
AC_BEFORE([$0], [AC_TRY_LINK])dnl
|
||||
AC_BEFORE([$0], [AC_TRY_RUN])dnl
|
||||
AC_MSG_CHECKING(for AIX)
|
||||
AC_EGREP_CPP(yes,
|
||||
@ -1881,7 +1883,8 @@ AC_EGREP_CPP(yes,
|
||||
])
|
||||
|
||||
AC_DEFUN(AC_MINIX,
|
||||
[AC_BEFORE([$0], [AC_TRY_LINK])dnl
|
||||
[AC_BEFORE([$0], [AC_TRY_COMPILE])dnl
|
||||
AC_BEFORE([$0], [AC_TRY_LINK])dnl
|
||||
AC_BEFORE([$0], [AC_TRY_RUN])dnl
|
||||
AC_CHECK_HEADER(minix/config.h, MINIX=yes, MINIX=)
|
||||
if test "$MINIX" = yes; then
|
||||
@ -1893,6 +1896,7 @@ fi
|
||||
|
||||
AC_DEFUN(AC_ISC_POSIX,
|
||||
[AC_BEFORE([$0], [AC_TRY_LINK])dnl
|
||||
AC_BEFORE([$0], [AC_TRY_LINK])dnl
|
||||
AC_BEFORE([$0], [AC_TRY_RUN])dnl
|
||||
AC_MSG_CHECKING(for POSIXized ISC)
|
||||
if test -d /etc/conf/kconfig.d &&
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user