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autoconf: modernize and modularize

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Use my modular m4 library used for other things as well; update
autoconf macros to 2.71 standard.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2024-06-10 18:24:53 -07:00
parent 33051a296c
commit fefaa2cc5c
35 changed files with 680 additions and 461 deletions
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25
autoconf/m4/pa_sigsetjmp.m4 Normal file
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@ -0,0 +1,25 @@
dnl --------------------------------------------------------------------------
dnl PA_SIGSETJMP
dnl
dnl Do we have sigsetjmp/siglongjmp? (AC_CHECK_FUNCS doesn't seem to work
dnl for these particular functions.)
dnl --------------------------------------------------------------------------
AC_DEFUN([PA_SIGSETJMP],
[AC_MSG_CHECKING([for sigsetjmp])
AC_LINK_IFELSE([AC_LANG_SOURCE(
[
AC_INCLUDES_DEFAULT
#include <setjmp.h>
int main(void) {
sigjmp_buf buf;
if (sigsetjmp(buf,1))
return 0;
siglongjmp(buf,2);
return 1;
}
])],
[AC_MSG_RESULT([yes])
AC_DEFINE([HAVE_SIGSETJMP], 1,
[Define to 1 if your system has sigsetjmp/siglongjmp])],
[AC_MSG_RESULT([no])])])