On Thu, 2020-05-21 at 17:35 +0200, Romain Naour wrote: > As reported by several Buildroot users [1][2][3], the gcc build > may fail while running selftests makefile target. > > The problem only occurs when ccache is used with gcc 9 and 10, > probably due to a race condition. > > While debuging with "make -p" we can notice that s-selftest-c target > contain only "cc1" as dependency instead of cc1 and SELFTEST_DEPS > [4]. > > s-selftest-c: cc1 > > While the build is failing, the s-selftest-c dependencies recipe is > still running and reported as a bug by make. > > "Dependencies recipe running (THIS IS A BUG)." > > A change [5] in gcc 9 seems to introduce the problem since we can't > reproduce this problem with gcc 8.
Sorry about introducing the breakage. The patch looks sane to me, though I don't know if I can formally approve it (and I'm now doubting my "make" skills...) Dave
