[ATfE] Enable minimal libc++ testing with LLVM libc - #953
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This adds one AArch64 and two Armv7-M (softfp and hardfp) configurations to test libc++ on top on LLVM libc. This requires some small changes/fixes along the way: - JSON files enable tests and also provide enough memory for C++ tests. - CMake and lit option to tell which C library is used for C++ tests. - CMake disable unused rt library. - Test runners to only pass the name of the test binary - not full paths that exceeds LLVM libc bootcode limit and is not used anyway. - Enable stderr to be used separately from stdout in LLVM semihosting and FVP parameters. The resulting failures added to the xfail list: mostly missing functionality or mismatch with hosted behavior. A few stdin tests excluded since they hang with semihosting thus trigger the long timeout.
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This adds one AArch64 and two Armv7-M (softfp and hardfp) configurations to test libc++ on top on LLVM libc.
This requires some small changes/fixes along the way:
The resulting failures added to the xfail list: mostly missing functionality or mismatch with hosted behavior. A few stdin tests excluded since they hang with semihosting thus trigger the long timeout.