diff options
Diffstat (limited to 'tool/m4/ruby_cppoutfile.m4')
| -rw-r--r-- | tool/m4/ruby_cppoutfile.m4 | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/tool/m4/ruby_cppoutfile.m4 b/tool/m4/ruby_cppoutfile.m4 new file mode 100644 index 0000000000..976cbb1c43 --- /dev/null +++ b/tool/m4/ruby_cppoutfile.m4 @@ -0,0 +1,18 @@ +dnl -*- Autoconf -*- +AC_DEFUN([RUBY_CPPOUTFILE], +[AC_CACHE_CHECK(whether ${CPP} accepts -o, rb_cv_cppoutfile, +[save_CPPFLAGS="$CPPFLAGS" +CPPFLAGS='-o conftest-1.i' +rb_cv_cppoutfile=no +AC_PREPROC_IFELSE([AC_LANG_SOURCE([[test-for-cppout]])], + [grep test-for-cppout conftest-1.i > /dev/null && rb_cv_cppoutfile=yes]) +CPPFLAGS="$save_CPPFLAGS" +rm -f conftest*]) +AS_IF([test "$rb_cv_cppoutfile" = yes], [ + CPPOUTFILE='-o conftest.i' +], [test "$rb_cv_cppoutfile" = no], [ + CPPOUTFILE='> conftest.i' +], [test -n "$rb_cv_cppoutfile"], [ + CPPOUTFILE="$rb_cv_cppoutfile" +]) +AC_SUBST(CPPOUTFILE)])dnl |