Created attachment 920021 [details] gnustep-base/gnustep-base-1.30.0 build.log (xz compressed) CFLAGS appended with -std=gnu17 in user env https://github.com/gnustep/libs-base/blob/master/configure.ac#L128 This is similar issue to what qmake suffers from. The flags that are configured when building gnustep-make will be used for gnustep-base. I was affected by this when I tried to take a shortcut with a C23 issue (GCC-15 changed the default to it) by setting an older C standard via CFLAGS.
Created attachment 920022 [details] emerge --info
Now I hit another problem where adding or removing flags would help, but due to this I have to build both packages with these workarounds. In this case an ICE from lld on the llvm profile when built against libobjc2. https://github.com/llvm/llvm-project/issues/60137
