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toolchain.eclass: add USE=custom-cflags for gcc-11

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Sometimes it's useful to build gcc quickly with CFLAGS=-O0
as a smoke test for sanity. CFLAGS=-O3 should also generally
work as a code generation stres test. But not in general case.

Some options like -flto would probably not work as is.

Let's allow users to experiment with gcc flags if they really
want to.

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
This commit is contained in:
Sergei Trofimovich
2020-11-08 10:56:44 +00:00
parent 1757a11e00
commit 41d8f38ef4
1 changed files with 13 additions and 6 deletions
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19
eclass/toolchain.eclass
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@@ -181,6 +181,7 @@ if [[ ${PN} != "kgcc64" && ${PN} != gcc-* ]] ; then
tc_version_is_at_least 9.1 && IUSE+=" lto"
tc_version_is_at_least 10 && IUSE+=" zstd" TC_FEATURES+=(zstd)
tc_version_is_at_least 11 && IUSE+=" valgrind" TC_FEATURES+=(valgrind)
tc_version_is_at_least 11 && IUSE+=" custom-cflags"
fi
if tc_version_is_at_least 10; then
@@ -1391,12 +1392,18 @@ downgrade_arch_flags() {
}
gcc_do_filter_flags() {
# Be conservative here:
# - don't allow -O3 and like to over-optimize libgcc # 701786
# - don't allow -O0 to generate potentially invalid startup code
strip-flags
filter-flags '-O?'
append-flags -O2
# Allow users to explicitly avoid flag sanitization via
# USE=custom-cflags.
if ! _tc_use_if_iuse custom-cflags; then
# Over-zealous CFLAGS can often cause problems. What may work for one
# person may not work for another. To avoid a large influx of bugs
# relating to failed builds, we strip most CFLAGS out to ensure as few
# problems as possible.
strip-flags
# Lock gcc at -O2; we want to be conservative here.
filter-flags '-O?'
append-flags -O2
fi
# dont want to funk ourselves
filter-flags '-mabi*' -m31 -m32 -m64