The %T lit expansion expands to a common directory shared between all the tests in the same directory, which is unexpected and unintuitive, and more importantly, it's been a source of subtle race conditions and flaky tests. In https://reviews.llvm.org/D35396, it was agreed that it would be best to simply ban %T and only keep %t, which is unique to each test. When a test needs a temporary directory, it can just create one using mkdir %t.
This patch removes %T in llvm.
Differential Revision: https://reviews.llvm.org/D36495
llvm-svn: 310953
Also,
Revert "test: remove the archive before modifying it"
Revert "test: explicitly use gnu format"
This reverts commits r286778, r286729 and r286767, as they are randomly failing
on many bots (AArch64, x86_64).
llvm-svn: 286820
Kuba Mracek