From d5914ecbb0285aea1eb2b9432d6e91155877fd95 Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Thu, 9 Jun 2016 21:53:59 +0200 Subject: [PATCH] configure: only add -Wunused-result if supported by the compiler Old gcc versions such as 4.3.x do not support -Wunused-result, so instead of unconditionally using this warning, only use it if supported by the compiler. Signed-off-by: Thomas Petazzoni --- Submitted upstream: https://github.com/obgm/libcoap/pull/32 configure.ac | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index f4452ac..6354fcf 100644 --- a/configure.ac +++ b/configure.ac @@ -110,12 +110,12 @@ WARNING_CFLAGS="\ -Wswitch-default \ -Wswitch-enum \ -Wunused \ --Wunused-result \ " # check whether or not the compiler supports -Wlogical-op (clang does not...) AX_CHECK_COMPILE_FLAG([-Wlogical-op], [WARNING_CFLAGS="$WARNING_CFLAGS -Wlogical-op"],,[-Werror]) AX_CHECK_COMPILE_FLAG([-fdiagnostics-color], [CFLAGS="$CFLAGS -fdiagnostics-color"],,[-Werror]) +AX_CHECK_COMPILE_FLAG([-Wunused-result], [WARNING_CFLAGS="$WARNING_CFLAGS -Wunused-result"]) AC_SUBST([WARNING_CFLAGS]) -- 2.7.4