1377211 - Build failures on try provide useless error messages ("cc1plus: error: to generate dependencies you must specify either -M or -MM")

Status: RESOLVED DUPLICATE of bug 1376593

(Developer Services :: General, task)

Description

[Kartikaya Gupta (email:[e-mail])]

This is probably not the right component for this bug, but I don't know what is.

Lately build failures on try pushes have been eating the compiler error messages and providing a useless generic error message instead. See for example [1], which has this output:

INFO -  cc1plus: error: to generate dependencies you must specify either -M or -MM
INFO -  /home/worker/workspace/build/src/config/rules.mk:1010: recipe for target 'UnifiedBindings22.o' failed
INFO -  gmake[5]: *** [UnifiedBindings22.o] Error 1
INFO -  gmake[5]: *** Waiting for unfinished jobs....

[1] https://treeherder.mozilla.org/logviewer.html#?job_id=110786315&repo=try&lineNumber=10326

Comment 1

[Kartikaya Gupta (email:[e-mail])]

Possibly, but probably not, related: https://bugzilla.redhat.com/show_bug.cgi?id=1373295 which points to https://github.com/ccache/ccache/issues/129

FWIW our linux64 builders have ccache 3.1.8 (per "ccache --version" on a one-click loaner).

Comment 2

[Kartikaya Gupta (email:[e-mail])]

This looks like an sccache bug. I reproduced the failed build on a one-click loaner for a failing linux64 build, and isolated one of the failing commands. Running that command manually:

/home/worker/workspace/build/src/sccache2/sccache /home/worker/workspace/build/src/gcc/bin/g++ -std=gnu++11 ..[snip].. Unified_cpp_gfx_layers0.cpp

produces this output:

cc1plus: error: to generate dependencies you must specify either -M or -MM

whereas if I run the same command without the sccache wrapper it produces the actual compiler error messages.