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Override AC_C_PROGRAM on old autoconf

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Autoconf 2.69 fails to detect `-Werror=old-style-definition` due
to the old style definition of `main`.
This commit is contained in:
Nobuyoshi Nakada 2022-01-22 19:05:02 +09:00
parent 2c25427496
commit ad150a1459
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1 changed files with 15 additions and 0 deletions
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15
tool/m4/ruby_try_cflags.m4
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@ -1,4 +1,19 @@
dnl -*- Autoconf -*-
dnl
dnl Autoconf 2.67 fails to detect `-Werror=old-style-definition` due
dnl to the old style definition of `main`.
m4_version_prereq([2.70], [], [
m4_define([AC_LANG_PROGRAM(C)],
[$1
int
main (void)
{
$2
;
return 0;
}])
])dnl
dnl
AC_DEFUN([RUBY_TRY_CFLAGS], [
AC_MSG_CHECKING([whether ]$1[ is accepted as CFLAGS])
RUBY_WERROR_FLAG([