Fix incorrect gbuild usage that can cause intermittent parallel build failures.
There was some misuse of gbuild that was causing make rules to be added
that had solver/*/*/workdir/Extern
Fix incorrect gbuild usage that can cause intermittent parallel build failures.
There was some misuse of gbuild that was causing make rules to be added
that had solver/*/*/workdir/ExternalHeaders/Library and
solver/*/*/workdir/ExternalHeaders/Library listed as dependencies.
If these directories did not exist, then a pattern match rule intended
to create files under the
solver/*/*/workdir/ExternalHeaders/{Library,StaticLibrary} directories
would be triggered. The recipe for that rule would then
mkdir -p solver/*/*/workdir/ExternalHeaders
and then
touch solver/*/*/workdir/ExternalHeaders/{Library,StaticLibrary}
creating it as a plain file. A subsequent make rule would
unconditionally
mkdir -p solver/*/*/workdir/ExternalHeaders/{Library,StaticLibrary}
and fail.
Fix the incorrect gbuild usage and add some sanity checks to gbuild
to catch the problem closer to the source and more deterministically.
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