# -*- autoconf -*- AT_BANNER([Low level compiling/preprocessing macros.]) # Since the macros which compile are required by most tests, check # them first. But remember that looking for a compiler is even more # primitive, so check those first. ## --------- ## ## AC_LANG. ## ## --------- ## # Check that AC_LANG is optimizing, i.e., we don't output useless # language changes. Still, make sure we do change the language when # needed :) AT_SETUP([AC_LANG]) AT_DATA([configure.ac], [[AC_INIT AC_LANG(C) AC_LANG(C++) AC_LANG(C++) AC_LANG(Fortran 77) AC_LANG(Fortran 77) ]]) AT_CHECK_AUTOCONF AT_CHECK([sed -n 's/^ac_ext=//p' configure], 0, [c cc f ]) AT_CLEANUP ## ------------------------------------- ## ## AC_LANG, AC_LANG_PUSH & AC_LANG_POP. ## ## ------------------------------------- ## AT_SETUP([AC_LANG, AC_LANG_PUSH & AC_LANG_POP]) AT_DATA([configure.ac], [[AC_INIT # C AC_LANG(C) # C AC_LANG_PUSH(C) # C C AC_LANG_PUSH(C++) # C++ C C AC_LANG(C++) # C++ C C AC_LANG_PUSH(Fortran 77) # F77 C++ C C AC_LANG_POP(Fortran 77) # C++ C C AC_LANG(C++) # C++ C C AC_LANG_POP(C++) # C C AC_LANG_POP(C) # C ]]) AT_CHECK_AUTOCONF AT_CHECK([sed -n 's/^ac_ext=//p' configure], 0, [c cc f cc c ]) AT_CLEANUP ## ------------ ## ## Extensions. ## ## ------------ ## # As far as we know only `foo', `foo.exe' are possible executable, # and `foo.o', `foo.obj' are possible object files. Autoconf must not # know that, but it is OK for the test suite to take this into account. AT_CHECK_MACRO([Extensions], [[AC_PROG_CC case $ac_exeext in '' | '.exe' ) ;; * ) AC_MSG_ERROR([suspicious executable suffix: $ac_exeext]);; esac case $ac_objext in 'o' | 'obj' ) ;; * ) AC_MSG_ERROR([suspicious object suffix: $ac_objext]);; esac ]]) ## ------------ ## ## C keywords. ## ## ------------ ## # GCC supports `const', `volatile', and `inline'. AT_CHECK_MACRO([C keywords], [[AC_PROG_CC AC_C_CONST AC_C_INLINE AC_C_VOLATILE case $GCC,$ac_cv_c_const,$ac_cv_c_inline,$ac_cv_c_volatile in yes,*no*) AC_MSG_ERROR([failed to detect `const', `inline' or `volatile' support]);; esac ]]) ## --------------------------------- ## ## AC_PROG_CPP requires AC_PROG_CC. ## ## --------------------------------- ## # Must invoke AC_PROG_CC. AT_CHECK_MACRO([AC_PROG_CPP requires AC_PROG_CC], [[AC_PROG_CPP test -z "$CC" && AC_MSG_ERROR([looked for a C preprocessor without looking for a compiler]) ]]) ## --------------------------- ## ## AC_PROG_CPP with warnings. ## ## --------------------------- ## # It's Ok for strict preprocessors to produce warnings. AT_SETUP([AC_PROG_CPP with warnings]) AT_DATA([mycpp], [[#! /bin/sh echo noise >&2 exec ${1+"$@"} ]]) chmod +x mycpp _AT_CHECK_AC_MACRO( [AC_PROG_CPP # If the preprocessor is not strict, just ignore test "x$ac_c_preproc_warn_flag" = xyes && AC_MSG_ERROR([preprocessor has no warning option], 77) CPP="./mycpp $CPP" AC_CHECK_HEADERS(stdio.h autoconf_io.h)]) AT_CHECK_DEFINES( [/* #undef HAVE_AUTOCONF_IO_H */ #define HAVE_STDIO_H 1 ]) AT_CLEANUP ## ------------------------------ ## ## AC_PROG_CPP without warnings. ## ## ------------------------------ ## AT_SETUP([AC_PROG_CPP without warnings]) AT_DATA([mycpp], [[#! /bin/sh /lib/cpp ${1+"$@"} exit 0 ]]) chmod +x mycpp _AT_CHECK_AC_MACRO( [# Ignore if /lib/cpp doesn't work if AC_TRY_COMMAND([/lib/cpp &2]); then :; else AC_MSG_ERROR([preprocessor doesn't work], 77) fi CPP=./mycpp AC_PROG_CPP test "x$ac_c_preproc_warn_flag" != xyes && AC_MSG_ERROR([failed to detect preprocessor warning option]) AC_CHECK_HEADERS(stdio.h autoconf_io.h)]) AT_CHECK_DEFINES( [/* #undef HAVE_AUTOCONF_IO_H */ #define HAVE_STDIO_H 1 ]) AT_CLEANUP ## ------------------ ## ## AC_TRY_LINK_FUNC. ## ## ------------------ ## AT_CHECK_MACRO([AC_TRY_LINK_FUNC], [AC_TRY_LINK_FUNC(printf,, [AC_MSG_ERROR([cannot find `printf'])]) AC_TRY_LINK_FUNC(Be_doomed_if_your_libc_has_a_function_named_like_this, [AC_MSG_ERROR([found a nonexistent function])])]) ## --------------------- ## ## Fortran 77 Compiler. ## ## --------------------- ## AT_CHECK_MACRO([GNU Fortran 77], [[AC_LANG(Fortran 77) AC_LANG_COMPILER if AC_TRY_COMMAND([$F77 --version | grep GNU >&2]); then # Has GNU in --version. test "$G77" != yes && AC_MSG_ERROR([failed to recognize GNU Fortran 77 compiler]) else # Has not. test "$G77" = yes && AC_MSG_ERROR([incorrectly recognized a GNU Fortran 77 compiler]) fi AS_EXIT(0)]])