Bug 666966

Summary:	=www-client/firefox-62.0.2: USE="clang" and USE="neon" conflict with each other
Product:	Gentoo Linux	Reporter:	tt_1 <herrtimson>
Component:	Current packages	Assignee:	Mozilla Gentoo Team <mozilla>
Status:	RESOLVED FIXED
Severity:	normal	CC:	whissi
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description tt_1 2018-09-24 09:51:15 UTC

First of all - the neon useflag is intended for arm and masked on all other arches. The code behind it looks like this: 

	# Modifications to better support ARM, bug 553364
	if use neon ; then
		mozconfig_annotate '' --with-fpu=neon
		mozconfig_annotate '' --with-thumb=yes
		mozconfig_annotate '' --with-thumb-interwork=no
fi


At least one of the flags is rejected by clang, propably those related to thumb, as clang doesn't seem to support it. I'll hand in a proper build.log later on, my arm device is busy with other tasks at the moment. So this bug is a reminder to myself for the most of it. 

Please don't hardmask the clang useflag or remove tc-is-clang for arm profiles, because even if there is no official support for clang in Gentoo for arm profiles, firefox compiled by gcc on arm leads to a segfault at startup for the firefox binary, rendering the use of tc-is-gcc on arm as a waste of time. 

possible solution: make them conflict with each other, so that USE="clang neon" emerge -av =firefox-62.0.2 would blow up before portage starts emerging. It wouldn't affect any other arches, as the neon useflag is masked on those.

Comment 1 Larry the Git Cow gentoo-dev

2018-09-27 14:31:26 UTC

The bug has been referenced in the following commit(s):

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=2d25811f80b28d70558fdfff1391a856fbffd47f

commit 2d25811f80b28d70558fdfff1391a856fbffd47f
Author:     Thomas Deutschmann <whissi@gentoo.org>
AuthorDate: 2018-09-27 14:30:48 +0000
Commit:     Thomas Deutschmann <whissi@gentoo.org>
CommitDate: 2018-09-27 14:30:48 +0000

    www-client/firefox: clang doesn't support thumb-interwork
    
    Bug: https://bugs.gentoo.org/666966
    Signed-off-by: Thomas Deutschmann <whissi@gentoo.org>
    Package-Manager: Portage-2.3.50, Repoman-2.3.11

 www-client/firefox/firefox-62.0.2.ebuild | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Comment 2 tt_1 2018-09-27 16:51:46 UTC

Case closed, thanks for the fast fix!