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compilers: add logging to obscure compiler defines scraper
If this command fails, for example when CXX is something not generic enough to be a valid universal compiler command (clang -std=c++11 perhaps), we end up with two problems: - it's impossible to figure out what Meson ran to get that error - the error report isn't clear on what is stdout and what is stderr, or even that that is what the message is about. ``` meson.build:1:0: ERROR: Unable to get clang pre-processor defines: error: invalid argument '-std=c++11' not allowed with 'C' ``` What's C doing there and why is Meson talking about it? Answer: that's compiler stdout. Say so.
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