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From: "Sam James" <sam@gentoo.org>
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Message-ID: <1728042541.70a43aaf58504bb01c77faf58c96abe0b0ca856d.sam@gentoo>
Subject: [gentoo-commits] repo/gentoo:master commit in: eclass/
X-VCS-Repository: repo/gentoo
X-VCS-Files: eclass/toolchain.eclass
X-VCS-Directories: eclass/
X-VCS-Committer: sam
X-VCS-Committer-Name: Sam James
X-VCS-Revision: 70a43aaf58504bb01c77faf58c96abe0b0ca856d
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Date: Fri, 4 Oct 2024 11:49:46 +0000 (UTC)
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commit: 70a43aaf58504bb01c77faf58c96abe0b0ca856d
Author: Sam James <sam <AT> gentoo <DOT> org>
AuthorDate: Fri Oct 4 11:11:22 2024 +0000
Commit: Sam James <sam <AT> gentoo <DOT> org>
CommitDate: Fri Oct 4 11:49:01 2024 +0000
URL: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=70a43aaf
toolchain.eclass: add ewarns to explain USE=-debug behaviour w/ unreleased GCC
We sometimes have people surprised by the behaviour with USE=-debug for
unreleased versions of GCC.
For more detail on that & context, see:
* 564b130fd1bc8a35ac4d673d5211654c49af3fda
* 85db50a7c626a1844c8eb2d03051c8c5d320c205
* 3f9a5248fb796417d63ae1c1234b534a88f22f14
Add some ewarns to explain the situation to users so they understand
their options and also don't wrongly think GCC will be slow when released.
Bug: https://bugs.gentoo.org/904481
Signed-off-by: Sam James <sam <AT> gentoo.org>
eclass/toolchain.eclass | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/eclass/toolchain.eclass b/eclass/toolchain.eclass
index a2eba0a9297e..5b978f6871db 100644
--- a/eclass/toolchain.eclass
+++ b/eclass/toolchain.eclass
@@ -1148,7 +1148,15 @@ toolchain_src_configure() {
# unless USE=debug. Note that snapshots on stable branches don't count as "non-released"
# for these purposes.
if grep -q "experimental" gcc/DEV-PHASE ; then
- # - USE=debug for pre-releases: yes,extra,rtl
+ # Tell users about the non-obvious behavior here so they don't think
+ # e.g. the next GCC release is super slow to compile things.
+ ewarn "Unreleased GCCs default to extra runtime checks even with USE=-debug,"
+ ewarn "matching upstream default behavior. We recommend keeping these enabled."
+ ewarn "The checks (sometimes substantially) increase build time but provide important protection"
+ ewarn "from potential miscompilations (wrong code) by turning them into build-time errors."
+ ewarn "To override (not recommended), set: GCC_CHECKS_LIST=\"release\"."
+
+ # - USE=debug for pre-releases: yes,extra,rtl (stornger than USE=debug for releases)
# - USE=-debug for pre-releases: yes,extra (following upstream default)
confgcc+=( --enable-checking="${GCC_CHECKS_LIST:-$(usex debug yes,extra,rtl yes,extra)}" )
else