<div dir="ltr">If we're going to be making any significant changes to the way inferiors are compiled, why not use cmake? Make clean is already not implemented correctly in many places, leading to lots of remnants left over in the source tree after test runs. Furthermore, make is run every single time currently, leading to hundreds (if not thousands) of unnecessary compilations. Seems to me like all the inferiors should be compiled one time, up front, as part of the configure step, and into the build directory. This is nice because it already integrates perfectly into the existing LLVM "way" of building things.</div><br><div class="gmail_quote"><div dir="ltr">On Wed, Jan 17, 2018 at 12:32 PM Adrian Prantl via lldb-dev <<a href="mailto:lldb-dev@lists.llvm.org">lldb-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi lldb-dev!<br>
<br>
I've been investigating some spurious LLDB test suite failures on <a href="http://green.lab.llvm.org/green/" rel="noreferrer" target="_blank">http://green.lab.llvm.org/green/</a> that had to do with build artifacts from previous runs lying around in the test directories and this prompted me to ask a couple of general noob questions about the LLDB testsuite.<br>
<br>
My understanding is that all execution tests are compiled using using `make` in-tree. I.e.: the test driver (dotest.py) effectively executes something equivalent to `cd $srcdir/packages/.../mytest && make`. And it does this in a serial fashion for all configurations (dwarf, dSYM, dwo, ...) and relies on the `clean` target to be implemented correctly.<br>
<br>
I don't understand all the design decisions that went into the LLDB testsuite, but my naive intuition tells me that this is sub-optimal (because of the serialization of the configurations) and dangerous (because it relies on make clean being implemented correctly). It seems to me that a better approach would be to create a separate build directory for each test variant and then invoke something like `cd $builddir/test/mytest.dwarf && make -C $srcdir/packages/.../mytest`. This way all configurations can build in parallel, and we can simply nuke the build directory afterwards and this way get rid of all custom implementations of the `clean` target.<br>
<br>
- Is this already possible, and/or am I misunderstanding how it works?<br>
- Would this be a goal that is worthwhile to pursue?<br>
- Is there a good reason why we are not already doing it this way?<br>
<br>
thanks,<br>
adrian<br>
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</blockquote></div>