Bug#916393: llvm-toolchain-7: fails to work if cache directory not writeable

[Uwe Kleine-König]

Source: llvm-toolchain-7
Severity: normal

Hello,

llvm 7 makes sparse fail to build (even when #912566 is fixed). The
problem is that a test fails with:

	could not create jit cache directory /sbuild-nonexistent/.debug/jit/: Permission denied
	could not initialize debugging directory

This was not a problem with llvm 6.

To reproduce you can build git at salsa.debian.org:ukleinek/sparse.git in
unstable.

Best regards
Uwe

-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (700, 'testing'), (600, 'unstable'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'stable'), (499, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.19.0-trunk-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled