This is an auto-filed bug because sys-fs/quotatool 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 642420 [details]
build log and emerge --info
The bug has been closed via the following commit(s):
Author: David Seifert <email@example.com>
AuthorDate: 2020-09-16 20:16:19 +0000
Commit: David Seifert <firstname.lastname@example.org>
CommitDate: 2020-09-16 20:16:19 +0000
sys-fs/quotatool: Port to EAPI 7
Package-Manager: Portage-3.0.7, Repoman-3.0.1
Signed-off-by: David Seifert <email@example.com>
...lags.patch => quotatool-1.4.13-fix-buildsystem.patch} | 16 ++++++++++++----
sys-fs/quotatool/quotatool-1.6.2.ebuild | 14 ++++++++------
2 files changed, 20 insertions(+), 10 deletions(-)