Hello, We were trying to build 4.14 kernel with GCC 8, but perf failed to compile. The upstream tree seems to have necessary commits to support GCC 8, but they were not ported to 4.14 branch. With backporting the following commits we were able to restore perf compilation and compile a working 4.14 kernel with GCC 8.2: 6810158d526e483868e519befff407b91e76b3db: perf annotate: Use asprintf when formatting objdump command b7a313d84e853049062011d78cb04b6decd12f5c: perf tools: Fix python extension build for gcc 8 77f18153c080855e1c3fb520ca31a4e61530121d: perf tools: Fix snprint warnings for gcc 8 06c3f2aa9fc68e7f3fe3d83e7569d2a2801d9f99: perf utils: Move is_directory() to path.h Propose to apply the above commits to 4.14 to be able to compile it with GCC 8 (mostly to properly support CONFIG_RETPOLINE) Commit 6810158d526e483868e519befff407b91e76b3db might need adjustment to cleanly apply on 4.14 branch. Regards, Ignat
