[riot-notifications] [RIOT-OS/RIOT] make: disable dwarf compression on CI builds (#12198)

Kaspar Schleiser notifications at github.com
Wed Sep 11 10:40:05 CEST 2019

kaspar030 commented on this pull request.

> @@ -39,9 +39,10 @@ endif
 CFLAGS += -fno-common
 # Compress debug info. This saves approximately 50% of disk usage.
-# It has no effect if debugging information is not emitted, so it can be left
-# on unconditionally.
+# This makes ccache less effective, so disable for CI builds.
+ifneq (1, $(RIOT_CI_BUILD))

I'm in the process of nailing down the problem within the ccache source.
It seems like as soon as any "-g*" option is used, ccache assumes debug info is generated, and includes the current cwd in the hash that identifies cache entries. For "-gz" without any other "-g" other than "-g0", this is a ccache bug. CI builds with a seperate builddir per checkout, so that could be the reason why it is affected a lot more than a local build.

I'm just now trying to create a reproducer and maybe open an upstream bug. For now, I'm confident this is a corner case of how ccache is used in our CI...

Hm, I'm realizing that local builds in different build directories would be affected too. I do that all the time. :) So maybe guarding that by ccache is a good idea.

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