This is an auto-filled bug because dev-embedded/xa calls cc directly.
The issue was originally discovered on amd64, but it may be reproducible on other arches as well.
If you think that a different summary clarifies the issue better, feel free to change it.
Attached build log and emerge --info.
If you think it doesn't make sense fix these type of issues, I'd like to point out that won't be possible use a different CC implementation (like clang) by setting the CC variable. So this issue has been reproduced by setting the CC variable to x86_64-pc-linux-gnu-gcc and by removing the /usr/bin/cc - /usr/bin/gcc binaries.
Created attachment 638282 [details]
build log and emerge --info
The bug has been closed via the following commit(s):
Author: David Seifert <firstname.lastname@example.org>
AuthorDate: 2020-07-05 20:49:49 +0000
Commit: David Seifert <email@example.com>
CommitDate: 2020-07-05 20:49:49 +0000
dev-embedded/xa: Fix build system
Package-Manager: Portage-2.3.103, Repoman-2.3.23
Signed-off-by: David Seifert <firstname.lastname@example.org>
dev-embedded/xa/files/xa-2.3.10-Makefile.patch | 77 ++++++++++++++++++++++++++
dev-embedded/xa/xa-2.3.10.ebuild | 17 +++---
2 files changed, 85 insertions(+), 9 deletions(-)