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Bug 568306 - sys-devel/{gcc,binutils}: make cross-compiling poison logic kick in based on --sysroot settings
Summary: sys-devel/{gcc,binutils}: make cross-compiling poison logic kick in based on ...
Status: RESOLVED WONTFIX
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All All
: Normal enhancement (vote)
Assignee: Gentoo Crossdev team
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Depends on:
Blocks: crossdev-bugs
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Reported: 2015-12-15 05:52 UTC by SpanKY
Modified: 2019-12-23 00:12 UTC (History)
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Description SpanKY gentoo-dev 2015-12-15 05:52:52 UTC 
atm, we enable the poisoned system flags only for cross-compilers.  we should make these flags always available (even native toolchains), and by default only enable the warning when the active sysroot is not /.
Comment 1 Sergei Trofimovich (RETIRED) gentoo-dev 2019-12-22 23:57:49 UTC 
I guess it's specifically about the https://gitweb.gentoo.org/repo/gentoo.git/tree/eclass/toolchain.eclass#n1018:

	### Cross-compiler options
	if is_crosscompile ; then
		# Enable build warnings by default with cross-compilers when system
		# paths are included (e.g. via -I flags).
		confgcc+=( --enable-poison-system-directories )
Comment 2 Sergei Trofimovich (RETIRED) gentoo-dev 2019-12-23 00:12:55 UTC 
Gentoo stopped applying gcc-poison-system-directories.patch after gcc-5.5.0.

openembedded has a refreshed version of the patch:
    http://cgit.openembedded.org/openembedded-core/tree/meta/recipes-devtools/gcc/gcc-9.2/0002-gcc-poison-system-directories.patch

Does not looks like the patch ever meant to be applied upstream. I suggest upstreaming some form of this patch instead and make enhancements there.