9b652e276f
Fedora 42 updated to GCC15 which now defaults to GNU23 as the default instead of GNU17[1], and this breaks m4 compilation. Its been reported upstream [2], so until its fixed lets simply set C language version back to GNU17. [1] https://gcc.gnu.org/gcc-15/porting_to.html#c23 [2] https://savannah.gnu.org/support/?111150 Link: https://github.com/openwrt/openwrt/pull/18505 (cherry picked from commit 8c141e53d720b14a1d8595e0f756f1619df6e763) Link: https://github.com/openwrt/openwrt/pull/18581 Signed-off-by: Robert Marko <robimarko@gmail.com>