Neil Schemenauer <[email protected]> added the comment:
That's mysterious. I reviewed the 'stdout' log from the buildbot. The removal
of profile data is run early in the build:
find . -name '*.gc??' -exec rm -f {} ';'
Later, the bytearrayobject is compiled with profile generation enabled:
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall
-Wstrict-prototypes -std=c99 -Wextra -Wno-unused-result
-Wno-unused-parameter -Wno-missing-field-initializers
-Werror=implicit-function-declaration -fprofile-generate -I. -I./Include
-DPy_BUILD_CORE -o Objects/bytearrayobject.o Objects/bytearrayobject.c
When the unit tests run, we get errors:
profiling:/var/lib/buildbot/slaves/enable-optimizations-bot/3.x.gps-debian-profile-opt.nondebug/build/Objects/bytearrayobject.gcda:Merge
mismatch for function 35
The second build (with profile use) fails because of the missing profile
information:
gcc -pthread -c -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall
-Wstrict-prototypes -std=c99 -Wextra -Wno-unused-result
-Wno-unused-parameter -Wno-missing-field-initializers
-Werror=implicit-function-declaration -fprofile-use -fprofile-correction -I.
-I./Include -DPy_BUILD_CORE -o Objects/bytearrayobject.o
Objects/bytearrayobject.c
Objects/bytearrayobject.c: In function ‘bytearray_startswith’:
Objects/bytearrayobject.c:2429:1: error: the control flow of function
‘bytearray_startswith’ does not match its profile data (counter
‘time_profiler’) [-Werror=coverage-mismatch]
}
^
cc1: some warnings being treated as errors
Seems like a compiler bug to me. Wild theory, could it be something to do with
address randomization and forking? Looks like maybe the merge mismatch errors
come when the 'python' executable forks.
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<https://bugs.python.org/issue31963>
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