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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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26
autoconf/m4/pa_check_bad_stdc_inline.m4 Normal file
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@ -0,0 +1,26 @@
dnl --------------------------------------------------------------------------
dnl PA_CHECK_BAD_STDC_INLINE
dnl
dnl Some versions of gcc seem to apply -Wmissing-prototypes to C99
dnl inline functions, which means we need to use GNU inline syntax
dnl --------------------------------------------------------------------------
AC_DEFUN([PA_CHECK_BAD_STDC_INLINE],
[AC_MSG_CHECKING([if $CC supports C99 external inlines])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
AC_INCLUDES_DEFAULT
/* Don't mistake GNU inlines for c99 */
#if defined(__GNUC__) && !defined(__GNUC_STDC_INLINE__)
# error "Using gnu inline standard"
#endif
inline int foo(int x)
{
return x+1;
}
])],
[AC_MSG_RESULT([yes])
AC_DEFINE([HAVE_STDC_INLINE], 1,
[Define to 1 if your compiler supports C99 extern inline])],
[AC_MSG_RESULT([no])
PA_ADD_CFLAGS([-fgnu89-inline])])])