diff options
Diffstat (limited to 'tool/m4/ruby_try_cflags.m4')
| -rw-r--r-- | tool/m4/ruby_try_cflags.m4 | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/tool/m4/ruby_try_cflags.m4 b/tool/m4/ruby_try_cflags.m4 index f2c6a3094e..b74718fe5e 100644 --- a/tool/m4/ruby_try_cflags.m4 +++ b/tool/m4/ruby_try_cflags.m4 @@ -1,12 +1,24 @@ dnl -*- Autoconf -*- -AC_DEFUN([RUBY_TRY_CFLAGS], [ - AC_MSG_CHECKING([whether ]$1[ is accepted as CFLAGS]) +dnl +dnl Autoconf 2.67 fails to detect `-Werror=old-style-definition` due +dnl to the old style definition of `main`. +m4_version_prereq([2.70], [], [ +m4_defun([AC_LANG_PROGRAM(C)], m4_bpatsubst(m4_defn([AC_LANG_PROGRAM(C)]), [main ()], [main (void)])) +])dnl +dnl +AC_DEFUN([_RUBY_TRY_CFLAGS], [ RUBY_WERROR_FLAG([ CFLAGS="[$]CFLAGS $1" AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[$4]], [[$5]])], + [$2], [$3]) + ])dnl +])dnl +AC_DEFUN([RUBY_TRY_CFLAGS], [ + AC_MSG_CHECKING([whether ]$1[ is accepted as CFLAGS])dnl + _RUBY_TRY_CFLAGS([$1], [$2 AC_MSG_RESULT(yes)], [$3 - AC_MSG_RESULT(no)]) - ]) + AC_MSG_RESULT(no)], + [$4], [$5]) ])dnl |