various bug fixes

Makefile.in

@@ -26,6 +26,7 @@ INSTALL_DATA = @INSTALL_DATA@
 MAKEINFO = makeinfo
 TEXI2DVI = texi2dvi
 M4 = @M4@
+AWK = @AWK@
 PERL = @PERL@
 
 # Programs that are always installed.
@@ -70,7 +71,8 @@ DISTFILES = COPYING ChangeLog ChangeLog.1 INSTALL \
 	testsuite/lib/*.exp testsuite/autoconf.[gs]/*.exp \
 	standards.texi make-stds.texi standards.info*
 
-editsh = sed -e 's,@''datadir''@,$(acdatadir),g' -e 's,@''M4''@,$(M4),g'
+editsh = sed -e 's,@''datadir''@,$(acdatadir),g' -e \
+	's,@''M4''@,$(M4),g'  -e 's,@''AWK''@,$(AWK),g'
 editpl = sed -e 's,@''datadir''@,$(acdatadir),g' -e 's,@''PERL''@,$(PERL),g'
 
 all: ${SCRIPTS}

NEWS

@@ -1,5 +1,11 @@
 Major changes in release 2.2:
 
+* The ifnames utility is much faster but requires a "new awk" interpreter.
+* AC_CHECK_LIB and AC_HAVE_LIBRARY check and add the new
+  library before existing libs, not after, in case it uses them.
+* New macros: AC_FUNC_GETPGRP, AC_CHECK_TOOL.
+* Many additions to the TODO file :-)
+* Lots of bug fixes.
 
 Major changes in release 2.1:
 

TODO

@@ -116,13 +116,8 @@ Have AC_CANONICAL_* cache the host/build/target types.
 ------------------------------------------------------------------------------
 
 Look at contributions:
-	ifnames rewrite using nawk (Paul Eggert)
 	ac_include (Karl Berry)
-	tool_prefix (Roland McGrath)
 	aclocal.h tom@basil.icce.rug.NL (Tom R.Hageman)
-	inline rewrite (Jim Avera)
-	getpgrp and stringize (Arnold Robbins)
-	caching AC_DECL_YYTEXT (Karl Berry, John something)
 
 ------------------------------------------------------------------------------
 
@@ -203,11 +198,6 @@ From: "Randall S. Winchester" <rsw@eng.umd.edu>
 
 ------------------------------------------------------------------------------
 
-Handle trailing slashes in PATH elements in AC_CHECK_PROG,
-AC_PATH_PROG, AC_PROG_INSTALL.
-
-------------------------------------------------------------------------------
-
 In libc and make in aclocal.m4 I have AC_CHECK_SYMBOL, which checks for
 sys_siglist et al.  Using AC_CHECK_FUNC doesn't work on some system that
 winds up caring that you reference it as a function and it is really a
@@ -215,16 +205,7 @@ variable.  My version always declares the symbol as a char *[]; if that
 ends up a bad idea, we can have it take an arg with the C decl, but that is
 a bit verbose to write if it's actually superfluous.
 From Roland McGrath.
-
+[I'd call it AC_CHECK_VAR, I think. -djm]
-------------------------------------------------------------------------------
-
-In /gd4/gnu/hurd/aclocal.m4 I wrote AC_CHECK_TOOL, which is a boon when
-doing a lot of cross compilation, and I think a good thing to use
-generically (AC_PROG_{CC,RANLIB} should use it).  I want this merged so I
-can convert mach4's configure.in to stop using local hack macros, and
-finally get a configure.in up for hurd (and then rewrite its makefiles
-again).
-From Roland McGrath.
 
 ------------------------------------------------------------------------------
 

acconfig.h

@@ -52,6 +52,9 @@
 /* Define if the `getloadavg' function needs to be run setuid or setgid.  */
 #undef GETLOADAVG_PRIVILEGED
 
+/* Define if the `getpgrp' function takes no argument.  */
+#undef GETPGRP_VOID
+
 /* Define to `int' if <sys/types.h> doesn't define.  */
 #undef gid_t
 

acgeneral.m4

@@ -755,7 +755,8 @@ AC_CANONICAL_TARGET
 AC_CANONICAL_BUILD
 test "$host_alias" != "$target_alias" &&
   test "$program_prefix$program_suffix$program_transform_name" = \
-    NONENONEs,x,x, && program_prefix=${target_alias}-
+    NONENONEs,x,x, &&
+  program_prefix=${target_alias}-
 ])
 
 dnl Subroutines of AC_CANONICAL_SYSTEM.
@@ -770,6 +771,7 @@ fi
 
 AC_MSG_CHECKING(host system type)
 
+dnl Set host_alias.
 host_alias=$host
 case "$host_alias" in
 NONE)
@@ -782,6 +784,7 @@ NONE)
   esac ;;
 esac
 
+dnl Set the other host vars.
 host=`$ac_config_sub $host_alias`
 host_cpu=`echo $host | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\1/'`
 host_vendor=`echo $host | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\2/'`
@@ -799,6 +802,7 @@ AC_DEFUN(AC_CANONICAL_TARGET,
 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
 AC_MSG_CHECKING(target system type)
 
+dnl Set target_alias.
 target_alias=$target
 case "$target_alias" in
 NONE)
@@ -808,6 +812,7 @@ NONE)
   esac ;;
 esac
 
+dnl Set the other target vars.
 target=`$ac_config_sub $target_alias`
 target_cpu=`echo $target | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\1/'`
 target_vendor=`echo $target | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\2/'`
@@ -825,6 +830,7 @@ AC_DEFUN(AC_CANONICAL_BUILD,
 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
 AC_MSG_CHECKING(build system type)
 
+dnl Set build_alias.
 build_alias=$build
 case "$build_alias" in
 NONE)
@@ -834,6 +840,7 @@ NONE)
   esac ;;
 esac
 
+dnl Set the other build vars.
 build=`$ac_config_sub $build_alias`
 build_cpu=`echo $build | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\1/'`
 build_vendor=`echo $build | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\2/'`
@@ -1151,6 +1158,22 @@ done
 ifelse([$3], , , [test -n "[$]$1" || $1="$3"
 ])])
 
+dnl Internal subroutine.
+AC_DEFUN(AC_CHECK_TOOL_PREFIX,
+[AC_REQUIRE([AC_CANONICAL_HOST])dnl
+if test $host != $build; then
+  ac_tool_prefix=${host_alias}-
+else
+  ac_tool_prefix=
+fi
+])
+
+dnl AC_CHECK_TOOL(VARIABLE, PROG-TO-CHECK-FOR)
+AC_DEFUN(AC_CHECK_TOOL,
+[AC_REQUIRE([AC_CHECK_TOOL_PREFIX])dnl
+AC_CHECK_PROG($1, ${ac_tool_prefix}$2, ${ac_tool_prefix}$2, $2)
+])
+
 dnl Guess the value for the `prefix' variable by looking for
 dnl the argument program along PATH and taking its parent.
 dnl Example: if the argument is `gcc' and we find /usr/local/gnu/bin/gcc,
@@ -1168,7 +1191,7 @@ AC_MSG_CHECKING([for prefix by ])
 AC_PATH_PROG(AC_VAR_NAME, $1)
 changequote(<<, >>)dnl
   if test -n "$ac_cv_path_<<>>AC_VAR_NAME"; then
-    prefix=`echo $ac_cv_path_<<>>AC_VAR_NAME|sed 's%/[^/][^/]*/[^/][^/]*$%%'`
+    prefix=`echo $ac_cv_path_<<>>AC_VAR_NAME|sed 's%/[^/][^/]*//*[^/][^/]*$%%'`
 changequote([, ])dnl
   fi
 fi

acspecific.m4

@@ -250,7 +250,7 @@ AC_SUBST([SET_MAKE])dnl
 AC_DEFUN(AC_PROG_RANLIB,
 [AC_CHECK_PROG(RANLIB, ranlib, ranlib, :)])
 
-dnl Check for mawk first since it's said to be faster.
+dnl Check for mawk first since it's generally faster.
 AC_DEFUN(AC_PROG_AWK,
 [AC_CHECK_PROGS(AWK, mawk gawk nawk awk, )])
 
@@ -317,27 +317,34 @@ then
 fi
 AC_SUBST(LEXLIB)])
 
+dnl Check if lex declares yytext as a char * by default, not a char[].
+undefine([AC_DECL_YYTEXT])
 AC_DEFUN(AC_DECL_YYTEXT,
 [AC_REQUIRE_CPP()dnl
 AC_REQUIRE([AC_PROG_LEX])dnl
+AC_MSG_CHECKING(lex output file root)
+AC_CACHE_VAL(ac_cv_prog_lex_root,
+[# The minimal lex program is just a single line: %%.  But some broken lexes
+# (Solaris, I think it was) want two %% lines, so accommodate them.
+echo '%%
+%%' | $LEX
+if test -f lex.yy.c; then
+  ac_cv_prog_lex_root=lex.yy
+elif test -f lexyy.c; then
+  ac_cv_prog_lex_root=lexyy
+else
+  AC_MSG_ERROR(cannot find output from $LEX; giving up)
+fi])dnl
+LEX_OUTPUT_ROOT=$ac_cv_prog_lex_root
+AC_MSG_RESULT($ac_cv_prog_lex_root)
+AC_SUBST(LEX_OUTPUT_ROOT)dnl
+
 AC_MSG_CHECKING(whether yytext is a pointer)
 AC_CACHE_VAL(ac_cv_prog_lex_yytext_pointer,
 [# POSIX says lex can declare yytext either as a pointer or an array; the
 # default is implementation-dependent. Figure out which it is, since
 # not all implementations provide the %pointer and %array declarations.
-#
-# The minimal lex program is just a single line: %%.  But some broken lexes
-# (Solaris, I think it was) want two %% lines, so accommodate them.
 ac_cv_prog_lex_yytext_pointer=no
-  echo '%%
-%%' | $LEX
-if test -f lex.yy.c; then
-  LEX_OUTPUT_ROOT=lex.yy
-elif test -f lexyy.c; then
-  LEX_OUTPUT_ROOT=lexyy
-else
-  AC_MSG_ERROR([cannot find output from $LEX, giving up])
-fi
 echo 'extern char *yytext;' >>$LEX_OUTPUT_ROOT.c
 ac_save_LIBS="$LIBS"
 LIBS="$LIBS $LEXLIB"
@@ -348,7 +355,6 @@ AC_MSG_RESULT($ac_cv_prog_lex_yytext_pointer)
 if test $ac_cv_prog_lex_yytext_pointer = yes; then
   AC_DEFINE(YYTEXT_POINTER)
 fi
-AC_SUBST(LEX_OUTPUT_ROOT)dnl
 ])
 
 AC_DEFUN(AC_PROG_INSTALL,
@@ -368,8 +374,9 @@ if test -z "$INSTALL"; then
 AC_CACHE_VAL(ac_cv_path_install,
 [  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}:"
   for ac_dir in $PATH; do
-    case "$ac_dir" in
+    # Account for people who put trailing slashes in PATH elements.
-    ''|.|/etc|/usr/sbin|/usr/etc|/sbin|/usr/afsws/bin|/usr/ucb) ;;
+    case "$ac_dir/" in
+    /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;;
     *)
       # OSF1 and SCO ODT 3.0 have their own names for install.
       for ac_prog in ginstall installbsd scoinst install; do
@@ -838,6 +845,69 @@ if test $ac_cv_func_mmap = yes; then
 fi
 ])
 
+AC_DEFUN(AC_FUNC_GETPGRP,
+[AC_MSG_CHECKING(whether getpgrp takes no argument)
+AC_CACHE_VAL(ac_cv_func_getpgrp_void,
+[AC_TRY_RUN([
+/*
+ * If this system has a BSD-style getpgrp(),
+ * which takes a pid argument, exit unsuccessfully.
+ *
+ * Snarfed from Chet Ramey's bash pgrp.c test program
+ */
+#include <stdio.h>
+#include <sys/types.h>
+
+int     pid;
+int     pg1, pg2, pg3, pg4;
+int     ng, np, s, child;
+
+main()
+{
+        pid = getpid();
+        pg1 = getpgrp(0);
+        pg2 = getpgrp();
+        pg3 = getpgrp(pid);
+        pg4 = getpgrp(1);
+
+        /*
+         * If all of these values are the same, it's pretty sure that
+         * we're on a system that ignores getpgrp's first argument.
+         */
+        if (pg2 == pg4 && pg1 == pg3 && pg2 == pg3)
+                exit(0);
+
+        child = fork();
+        if (child < 0)
+                exit(1);
+        else if (child == 0) {
+                np = getpid();
+                /*
+                 * If this is Sys V, this will not work; pgrp will be
+                 * set to np because setpgrp just changes a pgrp to be
+                 * the same as the pid.
+                 */
+                setpgrp(np, pg1);
+                ng = getpgrp(0);        /* Same result for Sys V and BSD */
+                if (ng == pg1) {
+                        exit(1);
+                } else {
+                        exit(0);
+                }
+        } else {
+                wait(&s);
+                exit(s>>8);
+        }
+}
+], ac_cv_func_getpgrp_void=yes, ac_cv_func_getpgrp_void=no,
+   AC_MSG_ERROR(cannot check getpgrp if cross compiling))
+])
+AC_MSG_RESULT($ac_cv_func_getpgrp_void)
+if test $ac_cv_func_getpgrp_void = yes; then
+  AC_DEFINE(GETPGRP_VOID)
+fi
+])
+
 AC_DEFUN(AC_FUNC_VPRINTF,
 [AC_CHECK_FUNC(vprintf, AC_DEFINE(HAVE_VPRINTF))
 if test "$ac_cv_func_vprintf" != yes; then
@@ -1460,18 +1530,23 @@ if test $ac_cv_c_bigendian = yes; then
 fi
 ])
 
+dnl Do nothing if the compiler accepts the inline keyword.
+dnl Otherwise define inline to __inline__ or __inline if one of those work,
+dnl otherwise define inline to be empty.
 AC_DEFUN(AC_C_INLINE,
 [AC_MSG_CHECKING([for inline])
 AC_CACHE_VAL(ac_cv_c_inline,
-[if test "$GCC" = yes; then
+[ac_cv_c_inline=no
-AC_TRY_COMPILE(, [} inline foo() {], ac_cv_c_inline=yes, ac_cv_c_inline=no)
+for ac_kw in inline __inline__ __inline; do
-else
+  AC_TRY_COMPILE(, [} $ac_kw foo() {], [ac_cv_c_inline=$ac_kw; break])
-  ac_cv_c_inline=no
+done
-fi])dnl
+])dnl
 AC_MSG_RESULT($ac_cv_c_inline)
-if test $ac_cv_c_inline = no; then
+case "$ac_cv_c_inline" in
-  AC_DEFINE(inline, __inline)
+  inline | yes) ;;
-fi
+  no) AC_DEFINE(inline, ) ;;
+  *)  AC_DEFINE_UNQUOTED(inline, $ac_cv_c_inline) ;;
+esac
 ])
 
 AC_DEFUN(AC_C_CONST,

autoconf.texi

@@ -1606,6 +1606,20 @@ list are found, set @var{variable} to @var{value-if-not-found}; if
 is not changed.  Calls @code{AC_SUBST} for @var{variable}.
 @end defmac
 
+@defmac AC_CHECK_TOOL (@var{variable}, @var{prog-to-check-for})
+@maindex CHECK_TOOL
+Like @code{AC_CHECK_PROG}, but first looks for @var{prog-to-check-for}
+with a prefix of the host type as determined by @code{AC_CANONICAL_HOST},
+followed by a dash (@pxref{Canonicalizing}).  For example, if the user
+runs @samp{configure --host=i386-gnu}, then this call:
+@example
+AC_CHECK_TOOL(AR, ar)
+@end example
+@noindent
+sets @code{AR} to @file{i386-gnu-ar} if that program exists in
+@code{PATH}, or to @samp{ar} if not.
+@end defmac
+
 @defmac AC_PATH_PROG (@var{variable}, @var{prog-to-check-for} @r{[}, @var{value-if-not-found}@r{]})
 @maindex PATH_PROG
 Like @code{AC_CHECK_PROG}, but set @var{variable} to the entire
@@ -1789,11 +1803,21 @@ to the name of the group that should own the installed program.
 @defmac AC_FUNC_GETMNTENT
 @maindex FUNC_GETMNTENT
 @cvindex HAVE_GETMNTENT
-Check for the @code{getmntent} in the @file{sun} and @file{seq}
+Check for @code{getmntent} in the @file{sun} and @file{seq}
 libraries, for Irix 4 and PTX, respectively.  Then, if @code{getmntent} is
 available, define @code{HAVE_GETMNTENT}.
 @end defmac
 
+@defmac AC_FUNC_GETPGRP
+@maindex FUNC_GETPGRP
+@cvindex GETPGRP_VOID
+If @code{getpgrp} takes no argument (the POSIX.1 version), define
+@code{GETPGRP_VOID}.  Otherwise, it is the BSD version, which takes a
+process ID as an argument.  This macro does not check whether
+@code{getpgrp} exists at all; if you need to work in that situation,
+first call @code{AC_CHECK_FUNC} for @code{getpgrp}.
+@end defmac
+
 @defmac AC_FUNC_MEMCMP
 @maindex FUNC_MEMCMP
 @ovindex LIBOBJS
@@ -2403,9 +2427,9 @@ it as empty.
 @defmac AC_C_INLINE
 @maindex C_INLINE
 @cvindex inline
-If the C compiler is a version of GCC that supports the keyword
+If the C compiler supports the keyword @code{inline}, do nothing.
-@code{__inline} but not @code{inline} (such as some NeXT versions),
+Otherwise define @code{inline} to @code{__inline__} or @code{__inline}
-define @code{inline} to be @code{__inline}.
+if it accepts one of those, otherwise define @code{inline} to be empty.
 @end defmac
 
 @defmac AC_C_CHAR_UNSIGNED
@@ -3677,8 +3701,8 @@ a suggestion for what to use instead of @var{this-macro-name}.
 
 A few kinds of features can't be guessed automatically by running test
 programs.  For example, the details of the object file format, or
-special options that need to be passed to the compiler or linker.  It is
+special options that need to be passed to the compiler or linker.  You
-possible to check for such features using ad-hoc means, such as having
+can check for such features using ad-hoc means, such as having
 @code{configure} check the output of the @code{uname} program, or
 looking for libraries that are unique to particular systems.  However,
 Autoconf provides a uniform method for handling unguessable features.
@@ -3843,6 +3867,10 @@ creates in the current directory @file{host.h}, which is a link to
 to @file{@var{srcdir}/config/$@{obj_format@}.h}.
 @end defmac
 
+You can also use the host system type to find cross-compilation tools.
+@xref{Generic Programs}, for information about the @code{AC_CHECK_TOOL}
+macro which does that.
+
 @node Site Configuration, Invoking configure, Manual Configuration, Top
 @chapter Site Configuration
 

bin/ifnames.in

@@ -56,7 +56,7 @@ if test $show_version = yes; then
   exit 0
 fi
 
-mawk '
+@AWK@ '
   # Record that sym was found in FILENAME.
   function file_sym(sym,  i, fs) {
     if (sym ~ /^[A-Za-z_]/) {

configure.in

@@ -8,6 +8,7 @@ dnl their path, the installer can configure with a path that has GNU m4
 dnl first and get that path embedded in the installed autoconf and
 dnl autoheader scripts.
 AC_PATH_PROGS(M4, gm4 gnum4 m4, m4)
+AC_PROG_AWK
 
 dnl We use a path for perl so the #! line in autoscan will work.
 AC_PATH_PROG(PERL, perl, no)

doc/Makefile.in

@@ -26,6 +26,7 @@ INSTALL_DATA = @INSTALL_DATA@
 MAKEINFO = makeinfo
 TEXI2DVI = texi2dvi
 M4 = @M4@
+AWK = @AWK@
 PERL = @PERL@
 
 # Programs that are always installed.
@@ -70,7 +71,8 @@ DISTFILES = COPYING ChangeLog ChangeLog.1 INSTALL \
 	testsuite/lib/*.exp testsuite/autoconf.[gs]/*.exp \
 	standards.texi make-stds.texi standards.info*
 
-editsh = sed -e 's,@''datadir''@,$(acdatadir),g' -e 's,@''M4''@,$(M4),g'
+editsh = sed -e 's,@''datadir''@,$(acdatadir),g' -e \
+	's,@''M4''@,$(M4),g'  -e 's,@''AWK''@,$(AWK),g'
 editpl = sed -e 's,@''datadir''@,$(acdatadir),g' -e 's,@''PERL''@,$(PERL),g'
 
 all: ${SCRIPTS}

doc/autoconf.texi

@@ -1606,6 +1606,20 @@ list are found, set @var{variable} to @var{value-if-not-found}; if
 is not changed.  Calls @code{AC_SUBST} for @var{variable}.
 @end defmac
 
+@defmac AC_CHECK_TOOL (@var{variable}, @var{prog-to-check-for})
+@maindex CHECK_TOOL
+Like @code{AC_CHECK_PROG}, but first looks for @var{prog-to-check-for}
+with a prefix of the host type as determined by @code{AC_CANONICAL_HOST},
+followed by a dash (@pxref{Canonicalizing}).  For example, if the user
+runs @samp{configure --host=i386-gnu}, then this call:
+@example
+AC_CHECK_TOOL(AR, ar)
+@end example
+@noindent
+sets @code{AR} to @file{i386-gnu-ar} if that program exists in
+@code{PATH}, or to @samp{ar} if not.
+@end defmac
+
 @defmac AC_PATH_PROG (@var{variable}, @var{prog-to-check-for} @r{[}, @var{value-if-not-found}@r{]})
 @maindex PATH_PROG
 Like @code{AC_CHECK_PROG}, but set @var{variable} to the entire
@@ -1789,11 +1803,21 @@ to the name of the group that should own the installed program.
 @defmac AC_FUNC_GETMNTENT
 @maindex FUNC_GETMNTENT
 @cvindex HAVE_GETMNTENT
-Check for the @code{getmntent} in the @file{sun} and @file{seq}
+Check for @code{getmntent} in the @file{sun} and @file{seq}
 libraries, for Irix 4 and PTX, respectively.  Then, if @code{getmntent} is
 available, define @code{HAVE_GETMNTENT}.
 @end defmac
 
+@defmac AC_FUNC_GETPGRP
+@maindex FUNC_GETPGRP
+@cvindex GETPGRP_VOID
+If @code{getpgrp} takes no argument (the POSIX.1 version), define
+@code{GETPGRP_VOID}.  Otherwise, it is the BSD version, which takes a
+process ID as an argument.  This macro does not check whether
+@code{getpgrp} exists at all; if you need to work in that situation,
+first call @code{AC_CHECK_FUNC} for @code{getpgrp}.
+@end defmac
+
 @defmac AC_FUNC_MEMCMP
 @maindex FUNC_MEMCMP
 @ovindex LIBOBJS
@@ -2403,9 +2427,9 @@ it as empty.
 @defmac AC_C_INLINE
 @maindex C_INLINE
 @cvindex inline
-If the C compiler is a version of GCC that supports the keyword
+If the C compiler supports the keyword @code{inline}, do nothing.
-@code{__inline} but not @code{inline} (such as some NeXT versions),
+Otherwise define @code{inline} to @code{__inline__} or @code{__inline}
-define @code{inline} to be @code{__inline}.
+if it accepts one of those, otherwise define @code{inline} to be empty.
 @end defmac
 
 @defmac AC_C_CHAR_UNSIGNED
@@ -3677,8 +3701,8 @@ a suggestion for what to use instead of @var{this-macro-name}.
 
 A few kinds of features can't be guessed automatically by running test
 programs.  For example, the details of the object file format, or
-special options that need to be passed to the compiler or linker.  It is
+special options that need to be passed to the compiler or linker.  You
-possible to check for such features using ad-hoc means, such as having
+can check for such features using ad-hoc means, such as having
 @code{configure} check the output of the @code{uname} program, or
 looking for libraries that are unique to particular systems.  However,
 Autoconf provides a uniform method for handling unguessable features.
@@ -3843,6 +3867,10 @@ creates in the current directory @file{host.h}, which is a link to
 to @file{@var{srcdir}/config/$@{obj_format@}.h}.
 @end defmac
 
+You can also use the host system type to find cross-compilation tools.
+@xref{Generic Programs}, for information about the @code{AC_CHECK_TOOL}
+macro which does that.
+
 @node Site Configuration, Invoking configure, Manual Configuration, Top
 @chapter Site Configuration
 

ifnames.in

@@ -56,7 +56,7 @@ if test $show_version = yes; then
   exit 0
 fi
 
-mawk '
+@AWK@ '
   # Record that sym was found in FILENAME.
   function file_sym(sym,  i, fs) {
     if (sym ~ /^[A-Za-z_]/) {

ifnames.sh

@@ -56,7 +56,7 @@ if test $show_version = yes; then
   exit 0
 fi
 
-mawk '
+@AWK@ '
   # Record that sym was found in FILENAME.
   function file_sym(sym,  i, fs) {
     if (sym ~ /^[A-Za-z_]/) {

lib/autoconf/general.m4

@@ -755,7 +755,8 @@ AC_CANONICAL_TARGET
 AC_CANONICAL_BUILD
 test "$host_alias" != "$target_alias" &&
   test "$program_prefix$program_suffix$program_transform_name" = \
-    NONENONEs,x,x, && program_prefix=${target_alias}-
+    NONENONEs,x,x, &&
+  program_prefix=${target_alias}-
 ])
 
 dnl Subroutines of AC_CANONICAL_SYSTEM.
@@ -770,6 +771,7 @@ fi
 
 AC_MSG_CHECKING(host system type)
 
+dnl Set host_alias.
 host_alias=$host
 case "$host_alias" in
 NONE)
@@ -782,6 +784,7 @@ NONE)
   esac ;;
 esac
 
+dnl Set the other host vars.
 host=`$ac_config_sub $host_alias`
 host_cpu=`echo $host | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\1/'`
 host_vendor=`echo $host | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\2/'`
@@ -799,6 +802,7 @@ AC_DEFUN(AC_CANONICAL_TARGET,
 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
 AC_MSG_CHECKING(target system type)
 
+dnl Set target_alias.
 target_alias=$target
 case "$target_alias" in
 NONE)
@@ -808,6 +812,7 @@ NONE)
   esac ;;
 esac
 
+dnl Set the other target vars.
 target=`$ac_config_sub $target_alias`
 target_cpu=`echo $target | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\1/'`
 target_vendor=`echo $target | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\2/'`
@@ -825,6 +830,7 @@ AC_DEFUN(AC_CANONICAL_BUILD,
 [AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
 AC_MSG_CHECKING(build system type)
 
+dnl Set build_alias.
 build_alias=$build
 case "$build_alias" in
 NONE)
@@ -834,6 +840,7 @@ NONE)
   esac ;;
 esac
 
+dnl Set the other build vars.
 build=`$ac_config_sub $build_alias`
 build_cpu=`echo $build | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\1/'`
 build_vendor=`echo $build | sed 's/^\(.*\)-\(.*\)-\(.*\)$/\2/'`
@@ -1151,6 +1158,22 @@ done
 ifelse([$3], , , [test -n "[$]$1" || $1="$3"
 ])])
 
+dnl Internal subroutine.
+AC_DEFUN(AC_CHECK_TOOL_PREFIX,
+[AC_REQUIRE([AC_CANONICAL_HOST])dnl
+if test $host != $build; then
+  ac_tool_prefix=${host_alias}-
+else
+  ac_tool_prefix=
+fi
+])
+
+dnl AC_CHECK_TOOL(VARIABLE, PROG-TO-CHECK-FOR)
+AC_DEFUN(AC_CHECK_TOOL,
+[AC_REQUIRE([AC_CHECK_TOOL_PREFIX])dnl
+AC_CHECK_PROG($1, ${ac_tool_prefix}$2, ${ac_tool_prefix}$2, $2)
+])
+
 dnl Guess the value for the `prefix' variable by looking for
 dnl the argument program along PATH and taking its parent.
 dnl Example: if the argument is `gcc' and we find /usr/local/gnu/bin/gcc,
@@ -1168,7 +1191,7 @@ AC_MSG_CHECKING([for prefix by ])
 AC_PATH_PROG(AC_VAR_NAME, $1)
 changequote(<<, >>)dnl
   if test -n "$ac_cv_path_<<>>AC_VAR_NAME"; then
-    prefix=`echo $ac_cv_path_<<>>AC_VAR_NAME|sed 's%/[^/][^/]*/[^/][^/]*$%%'`
+    prefix=`echo $ac_cv_path_<<>>AC_VAR_NAME|sed 's%/[^/][^/]*//*[^/][^/]*$%%'`
 changequote([, ])dnl
   fi
 fi

lib/autoconf/specific.m4

@@ -250,7 +250,7 @@ AC_SUBST([SET_MAKE])dnl
 AC_DEFUN(AC_PROG_RANLIB,
 [AC_CHECK_PROG(RANLIB, ranlib, ranlib, :)])
 
-dnl Check for mawk first since it's said to be faster.
+dnl Check for mawk first since it's generally faster.
 AC_DEFUN(AC_PROG_AWK,
 [AC_CHECK_PROGS(AWK, mawk gawk nawk awk, )])
 
@@ -317,27 +317,34 @@ then
 fi
 AC_SUBST(LEXLIB)])
 
+dnl Check if lex declares yytext as a char * by default, not a char[].
+undefine([AC_DECL_YYTEXT])
 AC_DEFUN(AC_DECL_YYTEXT,
 [AC_REQUIRE_CPP()dnl
 AC_REQUIRE([AC_PROG_LEX])dnl
+AC_MSG_CHECKING(lex output file root)
+AC_CACHE_VAL(ac_cv_prog_lex_root,
+[# The minimal lex program is just a single line: %%.  But some broken lexes
+# (Solaris, I think it was) want two %% lines, so accommodate them.
+echo '%%
+%%' | $LEX
+if test -f lex.yy.c; then
+  ac_cv_prog_lex_root=lex.yy
+elif test -f lexyy.c; then
+  ac_cv_prog_lex_root=lexyy
+else
+  AC_MSG_ERROR(cannot find output from $LEX; giving up)
+fi])dnl
+LEX_OUTPUT_ROOT=$ac_cv_prog_lex_root
+AC_MSG_RESULT($ac_cv_prog_lex_root)
+AC_SUBST(LEX_OUTPUT_ROOT)dnl
+
 AC_MSG_CHECKING(whether yytext is a pointer)
 AC_CACHE_VAL(ac_cv_prog_lex_yytext_pointer,
 [# POSIX says lex can declare yytext either as a pointer or an array; the
 # default is implementation-dependent. Figure out which it is, since
 # not all implementations provide the %pointer and %array declarations.
-#
-# The minimal lex program is just a single line: %%.  But some broken lexes
-# (Solaris, I think it was) want two %% lines, so accommodate them.
 ac_cv_prog_lex_yytext_pointer=no
-  echo '%%
-%%' | $LEX
-if test -f lex.yy.c; then
-  LEX_OUTPUT_ROOT=lex.yy
-elif test -f lexyy.c; then
-  LEX_OUTPUT_ROOT=lexyy
-else
-  AC_MSG_ERROR([cannot find output from $LEX, giving up])
-fi
 echo 'extern char *yytext;' >>$LEX_OUTPUT_ROOT.c
 ac_save_LIBS="$LIBS"
 LIBS="$LIBS $LEXLIB"
@@ -348,7 +355,6 @@ AC_MSG_RESULT($ac_cv_prog_lex_yytext_pointer)
 if test $ac_cv_prog_lex_yytext_pointer = yes; then
   AC_DEFINE(YYTEXT_POINTER)
 fi
-AC_SUBST(LEX_OUTPUT_ROOT)dnl
 ])
 
 AC_DEFUN(AC_PROG_INSTALL,
@@ -368,8 +374,9 @@ if test -z "$INSTALL"; then
 AC_CACHE_VAL(ac_cv_path_install,
 [  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}:"
   for ac_dir in $PATH; do
-    case "$ac_dir" in
+    # Account for people who put trailing slashes in PATH elements.
-    ''|.|/etc|/usr/sbin|/usr/etc|/sbin|/usr/afsws/bin|/usr/ucb) ;;
+    case "$ac_dir/" in
+    /|./|.//|/etc/*|/usr/sbin/*|/usr/etc/*|/sbin/*|/usr/afsws/bin/*|/usr/ucb/*) ;;
     *)
       # OSF1 and SCO ODT 3.0 have their own names for install.
       for ac_prog in ginstall installbsd scoinst install; do
@@ -838,6 +845,69 @@ if test $ac_cv_func_mmap = yes; then
 fi
 ])
 
+AC_DEFUN(AC_FUNC_GETPGRP,
+[AC_MSG_CHECKING(whether getpgrp takes no argument)
+AC_CACHE_VAL(ac_cv_func_getpgrp_void,
+[AC_TRY_RUN([
+/*
+ * If this system has a BSD-style getpgrp(),
+ * which takes a pid argument, exit unsuccessfully.
+ *
+ * Snarfed from Chet Ramey's bash pgrp.c test program
+ */
+#include <stdio.h>
+#include <sys/types.h>
+
+int     pid;
+int     pg1, pg2, pg3, pg4;
+int     ng, np, s, child;
+
+main()
+{
+        pid = getpid();
+        pg1 = getpgrp(0);
+        pg2 = getpgrp();
+        pg3 = getpgrp(pid);
+        pg4 = getpgrp(1);
+
+        /*
+         * If all of these values are the same, it's pretty sure that
+         * we're on a system that ignores getpgrp's first argument.
+         */
+        if (pg2 == pg4 && pg1 == pg3 && pg2 == pg3)
+                exit(0);
+
+        child = fork();
+        if (child < 0)
+                exit(1);
+        else if (child == 0) {
+                np = getpid();
+                /*
+                 * If this is Sys V, this will not work; pgrp will be
+                 * set to np because setpgrp just changes a pgrp to be
+                 * the same as the pid.
+                 */
+                setpgrp(np, pg1);
+                ng = getpgrp(0);        /* Same result for Sys V and BSD */
+                if (ng == pg1) {
+                        exit(1);
+                } else {
+                        exit(0);
+                }
+        } else {
+                wait(&s);
+                exit(s>>8);
+        }
+}
+], ac_cv_func_getpgrp_void=yes, ac_cv_func_getpgrp_void=no,
+   AC_MSG_ERROR(cannot check getpgrp if cross compiling))
+])
+AC_MSG_RESULT($ac_cv_func_getpgrp_void)
+if test $ac_cv_func_getpgrp_void = yes; then
+  AC_DEFINE(GETPGRP_VOID)
+fi
+])
+
 AC_DEFUN(AC_FUNC_VPRINTF,
 [AC_CHECK_FUNC(vprintf, AC_DEFINE(HAVE_VPRINTF))
 if test "$ac_cv_func_vprintf" != yes; then
@@ -1460,18 +1530,23 @@ if test $ac_cv_c_bigendian = yes; then
 fi
 ])
 
+dnl Do nothing if the compiler accepts the inline keyword.
+dnl Otherwise define inline to __inline__ or __inline if one of those work,
+dnl otherwise define inline to be empty.
 AC_DEFUN(AC_C_INLINE,
 [AC_MSG_CHECKING([for inline])
 AC_CACHE_VAL(ac_cv_c_inline,
-[if test "$GCC" = yes; then
+[ac_cv_c_inline=no
-AC_TRY_COMPILE(, [} inline foo() {], ac_cv_c_inline=yes, ac_cv_c_inline=no)
+for ac_kw in inline __inline__ __inline; do
-else
+  AC_TRY_COMPILE(, [} $ac_kw foo() {], [ac_cv_c_inline=$ac_kw; break])
-  ac_cv_c_inline=no
+done
-fi])dnl
+])dnl
 AC_MSG_RESULT($ac_cv_c_inline)
-if test $ac_cv_c_inline = no; then
+case "$ac_cv_c_inline" in
-  AC_DEFINE(inline, __inline)
+  inline | yes) ;;
-fi
+  no) AC_DEFINE(inline, ) ;;
+  *)  AC_DEFINE_UNQUOTED(inline, $ac_cv_c_inline) ;;
+esac
 ])
 
 AC_DEFUN(AC_C_CONST,