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

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-23.05:
https://git.openwrt.org/6fc7344c93bc9d705da5cc6d995275f2fa8b3395

commit 6fc7344c93bc9d705da5cc6d995275f2fa8b3395
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>
    [Rework patch to make it apply]
    (cherry picked from commit 1e51fd037d780725ca31cc92b39078468a383295)
    Link: https://github.com/openwrt/openwrt/pull/19065
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 tools/elfutils/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/elfutils/Makefile b/tools/elfutils/Makefile
index f9c6272719..105be07720 100644
--- a/tools/elfutils/Makefile
+++ b/tools/elfutils/Makefile
@@ -19,6 +19,8 @@ PKG_INSTALL:=1
 
 include $(INCLUDE_DIR)/host-build.mk
 
+HOST_CFLAGS +=-std=gnu17
+
 HOST_CONFIGURE_ARGS += \
 	--disable-debuginfod \
 	--disable-libdebuginfod \