The MACHTYPE bash variable is an odd thing that returns e.g.
x86_64-redhat-linux-gnu on a CentOS system, but x86_64-pc-linux-gnu
on a Debian system, and possibly something different on other distros.
mach valgrind-test is the only place actually relying on MACHTYPE.
Others rely on information from python modules. Uniformize that, and use
the more generic 'pc' rather than 'redhat'.
This patch:
* Adds a suppression for some leaks in libLLVM-3.6-mesa.so.
* Adds Valgrind flag --keep-debuginfo=yes so that the abovementioned leak
stacks can be symbolised and hence suppressed even after
libLLVM-3.6-mesa.so is unmapped from the process.
* Adds Valgrind flag --expensive-definedness-checks=yes as an attempt to
reduce Memcheck false positives from LLVM and rustc compiled code. This
change is aimed primarily at bug 1365915.
MozReview-Commit-ID: KiOZG2O8wzs
This additionally changes exit() calls with |return VALUE| so
that we are sure to call the destructors and valgrind doesn't complain.
Moreover, this disables the 'new-profile' ping when Firefox is ran
on valgrind.
MozReview-Commit-ID: BlGE9w6yGCL
This will add more verbosity, with the intent of having the triggered
suppressions be displayed in the form:
"--23983-- used_suppression: 3 Bug 794372 /builds/slave/try-l64-valgrind-0000000000000/src/build/valgrind/cross-architecture.sup:90 suppressed: 20,736 bytes in 648 blocks"
This removes ambiguity as to which modules are being imported, making
import slightly faster as Python doesn't need to test so many
directories for file presence.
All files should already be using absolute imports because mach command
modules aren't imported to the package they belong to: they instead
belong to the "mach" package. So relative imports shouldn't have been
used.
