[openwrt/openwrt] tools: elfutils: set -std=gnu17

[LEDE Commits]

robimarko pushed a commit to openwrt/openwrt.git, branch openwrt-24.10:
https://git.openwrt.org/1e51fd037d780725ca31cc92b39078468a383295

commit 1e51fd037d780725ca31cc92b39078468a383295
Author: Robert Marko <robimarko at gmail.com>
AuthorDate: Wed Apr 16 13:59:14 2025 +0200

    tools: elfutils: set -std=gnu17
    
    Fedora 42 updated to GCC15 which now defaults to GNU23 as the default
    instead of GNU17[1], and this breaks m4 compilation.
    
    This looks like a gnulib issue, so until that is updated/fixed
    lets simply set C language version back to GNU17.
    
    [1] https://gcc.gnu.org/gcc-15/porting_to.html#c23
    
    Link: https://github.com/openwrt/openwrt/pull/18506
    (cherry picked from commit f165dd2f78f7aaafa85f59f5c35264dd03e3a6ce)
    Link: https://github.com/openwrt/openwrt/pull/18581
    Signed-off-by: Robert Marko <robimarko at gmail.com>
---
 tools/elfutils/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/elfutils/Makefile b/tools/elfutils/Makefile
index 2836cadc87..ae829cd340 100644
--- a/tools/elfutils/Makefile
+++ b/tools/elfutils/Makefile
@@ -69,7 +69,7 @@ ifeq ($(HOST_OS),Darwin)
   HOST_CFLAGS += -I/opt/homebrew/include
 endif
 
-HOST_CFLAGS += -Wno-error -fPIC
+HOST_CFLAGS += -Wno-error -fPIC -std=gnu17
 
 HOST_CONFIGURE_ARGS += \
 	--without-libintl-prefix \