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83 lines
1.9 KiB
Plaintext
83 lines
1.9 KiB
Plaintext
dnl RCSid:
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dnl $Id: aclocal.m4,v 1.6 2017/11/26 22:39:20 sjg Exp $
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dnl
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dnl
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dnl AC_CHECK_HEADER_HAS(HEADER, PATTERN, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]))
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AC_DEFUN(AC_CHECK_HEADER_HAS,
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[dnl first check if header exists and if so, see if it contains PATTERN
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ac_has_hdr=`echo "ac_cv_header_$1" | sed 'y%./+-%__p_%'`
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ac_has_it=`echo "ac_cv_header_$1"_$2 | sed 'y%./+-%__p_%'`
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if eval "test \"`echo x'$'$ac_has_hdr`\" = x"; then
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AC_CHECK_HEADER($1)
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fi
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if eval "test \"`echo '$'$ac_has_hdr`\" = yes"; then
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ac_x=HAVE_`echo "$1" | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
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AC_DEFINE_UNQUOTED($ac_x)
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AC_MSG_CHECKING([if $1 has $2])
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AC_CACHE_VAL($ac_has_it,
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[eval $ac_has_it=no
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AC_EGREP_HEADER($2, $1, eval "$ac_has_it=yes")])
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if eval "test \"`echo '$'$ac_has_it`\" = yes"; then
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AC_MSG_RESULT(yes)
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ac_x=HAVE_`echo "$1"_$2 | sed 'y%abcdefghijklmnopqrstuvwxyz./-%ABCDEFGHIJKLMNOPQRSTUVWXYZ___%'`
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AC_DEFINE_UNQUOTED($ac_x)
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ifelse([$3], , :, [$3])
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else
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AC_MSG_RESULT(no)
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ifelse([$4], , , [$4
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])dnl
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fi
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fi
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])
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dnl AC_EGREP(PATTERN, FILE, ACTION-IF-FOUND [,
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dnl ACTION-IF-NOT-FOUND])
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AC_DEFUN(AC_EGREP,
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[
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dnl Prevent m4 from eating character classes:
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changequote(, )dnl
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if egrep "$1" $2 >/dev/null 2>&1; then
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changequote([, ])dnl
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ifelse([$3], , :, [$3])
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ifelse([$4], , , [else
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$4
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])dnl
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fi
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])
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dnl
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dnl Test for __attribute__
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dnl
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AC_DEFUN(AC_C___ATTRIBUTE__, [
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AC_MSG_CHECKING(for __attribute__)
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AC_CACHE_VAL(ac_cv___attribute__, [
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AC_LINK_IFELSE([
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#include <stdlib.h>
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static void foo(void) __attribute__ ((noreturn));
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static void
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foo(void)
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{
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exit(1);
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}
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int
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main(int argc, char **argv)
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{
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foo();
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}
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],
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ac_cv___attribute__=yes,
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ac_cv___attribute__=no)])
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if test "$ac_cv___attribute__" = "yes"; then
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AC_DEFINE(HAVE___ATTRIBUTE__, 1, [define if your compiler has __attribute__])
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fi
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AC_MSG_RESULT($ac_cv___attribute__)
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])
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