This is an auto-filed bug because net-misc/sks 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 641524 [details]
build log and emerge --info
The bug has been closed via the following commit(s):
Author: Sam James <email@example.com>
AuthorDate: 2020-10-08 22:29:35 +0000
Commit: Sam James <firstname.lastname@example.org>
CommitDate: 2020-10-08 22:40:28 +0000
net-misc/sks: take 20200624 snapshot
Package-Manager: Portage-3.0.4, Repoman-3.0.1
Signed-off-by: Sam James <email@example.com>
net-misc/sks/Manifest | 1 +
.../sks/files/sks-1.1.6_p20200624-QA-fixups.patch | 71 +++++++++++
...s-1.1.6_p20200624-respect-CFLAGS-CXXFLAGS.patch | 81 +++++++++++++
net-misc/sks/sks-1.1.6_p20200624.ebuild | 132 +++++++++++++++++++++
4 files changed, 285 insertions(+)