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-rw-r--r--aclocal.m425
1 files changed, 25 insertions, 0 deletions
diff --git a/aclocal.m4 b/aclocal.m4
index 9578cd35c4..918e30a886 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -1849,6 +1849,31 @@ case $erl_gethrvtime in
esac
])dnl
+dnl ----------------------------------------------------------------------
+dnl
+dnl LM_TRY_ENABLE_CFLAG
+dnl
+dnl
+dnl Tries a CFLAG and sees if it can be enabled without compiler errors
+dnl $1: textual cflag to add
+dnl $2: variable to store the modified CFLAG in
+dnl Usage example LM_TRY_ENABLE_CFLAG([-Werror=return-type], [CFLAGS])
+dnl
+dnl
+AC_DEFUN([LM_TRY_ENABLE_CFLAG], [
+ AC_MSG_CHECKING([if we can add $1 to $2 (via CFLAGS)])
+ saved_CFLAGS=$CFLAGS;
+ CFLAGS="$1 $$2";
+ AC_TRY_COMPILE([],[return 0;],can_enable_flag=true,can_enable_flag=false)
+ CFLAGS=$saved_CFLAGS;
+ if test "X$can_enable_flag" = "Xtrue"; then
+ AC_MSG_RESULT([yes])
+ AS_VAR_SET($2, "$1 $$2")
+ else
+ AC_MSG_RESULT([no])
+ fi
+])
+
dnl ERL_TRY_LINK_JAVA(CLASSES, FUNCTION-BODY
dnl [ACTION_IF_FOUND [, ACTION-IF-NOT-FOUND]])
dnl Freely inspired by AC_TRY_LINK. (Maybe better to create a