commit: e51546df7ff0b4f452c0f4291de23fa083f3fa76
Author: Sam James <sam <AT> gentoo <DOT> org>
AuthorDate: Thu Oct 26 16:46:27 2023 +0000
Commit: Sam James <sam <AT> gentoo <DOT> org>
CommitDate: Thu Oct 26 16:47:26 2023 +0000
URL: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=e51546df
toolchain.eclass: pass -fno-control-flow-redundancy, filter flags for older
compilers too
If we're *building* an older GCC, then these flags won't be supported later
on during the boostrap process, so filter them out.
Also, pass -fno-control-flow-redundancy given it makes the compiler unbearably
slow (on a 3950x, it went from 2.5hours for pgo+lto+checking to 6+ hours) and it
doesn't really benefit us there anyway.
Signed-off-by: Sam James <sam <AT> gentoo.org>
eclass/toolchain.eclass | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index 8df8b506b0b1..4fd884f5f0bc 100644
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -1535,6 +1535,18 @@ gcc_do_filter_flags() {
fi
fi
+
+ if ver_test -lt 13.6 ; then
+ # These aren't supported by the just-built compiler either.
+ filter-flags -fharden-compares -fharden-conditional-branches \
+ -fharden-control-flow-redundancy -fhardcfr-skip-leaf \
+ -fhardcfr-check-exceptions
-fhardcfr-check-returning-calls \
+ '-fhardcfr-check-noreturn-calls=*'
+ fi
+
+ # Makes things painfully slow and no real beenfit for the compiler.
+ append-flags $(test-flags-CC -fno-harden-control-flow-redundancy)
+
# Please use USE=lto instead (bug #906007).
filter-lto
