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-rw-r--r--lib/erl_interface/aclocal.m426
-rw-r--r--lib/erl_interface/configure.in4
2 files changed, 30 insertions, 0 deletions
diff --git a/lib/erl_interface/aclocal.m4 b/lib/erl_interface/aclocal.m4
index 9578cd35c4..5d555a5123 100644
--- a/lib/erl_interface/aclocal.m4
+++ b/lib/erl_interface/aclocal.m4
@@ -1849,6 +1849,32 @@ 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 $1 to CFLAGS])
+ saved_CFLAGS=$CFLAGS;
+ CFLAGS="$1 $CFLAGS";
+ AC_TRY_COMPILE([],[return 0;],can_enable_flag=true,can_enable_flag=false)
+ CFLAGS=$saved_CFLAGS;
+ if test "X$can_enable_flag" = "Xtrue"; then
+ AC_MSG_RESULT([yes])
+ AS_VAR_SET($2, "$1 $CFLAGS")
+ else
+ AC_MSG_RESULT([no])
+ AS_VAR_SET($2, "$CFLAGS")
+ 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
diff --git a/lib/erl_interface/configure.in b/lib/erl_interface/configure.in
index 97f1cff345..d511f2e240 100644
--- a/lib/erl_interface/configure.in
+++ b/lib/erl_interface/configure.in
@@ -273,6 +273,8 @@ esac
AC_SUBST(WFLAGS)
if test "x$GCC" = xyes; then
+ # Treat certain GCC warnings as errors
+ LM_TRY_ENABLE_CFLAG([-Werror=return-type], [WERRORFLAGS])
WFLAGS="-Wall -Wstrict-prototypes -Wmissing-prototypes -Wmissing-declarations -Wnested-externs -Winline"
# check which GCC version
GCC_VERSION=`$CC -v 2>&1 | sed -n 's/gcc version //p'`
@@ -287,8 +289,10 @@ if test "x$GCC" = xyes; then
*)
WFLAGS="$WFLAGS -fno-strict-aliasing";;
esac
+ CFLAGS="$WERRORFLAGS $CFLAGS"
else
WFLAGS=""
+ WERRORFLAGS=""
fi
# ---------------------------------------------------------------------------