On 1/4/22 08:23, Richard Biener wrote:
Since we have a fixed set of supported linkers and we know their implementation status with respect to linker plugin support we can maybe auto-add -fno-use-linker-plugin (via specs?) when -fuse-ld=lld or -fuse-ld=mold is used?
Well, if I'm correct, we do so when GCC is configured with --with-ld=... That can perform version detection and so on. I still hope that ld.mold will support LTO plug-in quite soon. It's even possible that it will be there once GCC 12.1 is released.
But yes, adding a note to the documentation that for lld and mold LTO support is severely restricted compared to GNU ld or gold on platforms that support the linker plugin and thus their use is discouraged there might be a good idea.
I'm going to do that if ld.mold LTO support won't be available when 12.1 gets released. Martin
