This is an auto-filed bug because sci-libs/taucs calls ar 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 AR implementation (like llvm-ar) by setting the AR variable. So this issue has been reproduced by setting the AR variable to x86_64-pc-linux-gnu-ar and by removing the /usr/bin/ar binary.
Created attachment 642036 [details]
build log and emerge --info
The bug has been closed via the following commit(s):
Author: David Seifert <email@example.com>
AuthorDate: 2020-09-08 07:31:33 +0000
Commit: David Seifert <firstname.lastname@example.org>
CommitDate: 2020-09-08 07:31:33 +0000
sci-libs/taucs: Port to EAPI 7
Package-Manager: Portage-3.0.5, Repoman-3.0.1
Signed-off-by: David Seifert <email@example.com>
sci-libs/taucs/files/taucs-2.2-no-test-cilk.patch | 4 +-
sci-libs/taucs/files/taucs-2.2-respect-ar.patch | 22 +++++++++
sci-libs/taucs/taucs-2.2.ebuild | 60 +++++++++++------------
3 files changed, 54 insertions(+), 32 deletions(-)