870f0cd2a0 build: Add MemorySanitizer (MSan) in Travis to detect use of uninitialized memory (practicalswift)
Pull request description:
Add MemorySanitizer (MSan) in Travis to detect use of uninitialized memory.
First UBSan, then ASan followed by TSan... and now: yes, the wait is over -- **MSan is finally here!** :)
Some historical context:
* 2017: Continuous compilation with Clang Thread Safety analysis enabled (#10866, #10923)
* 2018: Continuous testing with trapping on signed integer overflows (`-ftrapv`) (#12686)
* 2018: Continuous testing of use of locale dependent functions (#13041)
* 2018: Continuous testing of format strings (#13705)
* 2018: Continuous compilation with MSVC `TreatWarningAsError` (#14151)
* 2018: Continuous testing under UndefinedBehaviorSanitizer – UBSan (#14252, #14673, #17006)
* 2018: Continuous testing under AddressSanitizer – ASan (#14794, #17205, #17674)
* 2018: Continuous testing under ThreadSanitizer – TSan (#14829)
* 2019: Continuous testing in an unsigned char environment (`-funsigned-char`) (#15134)
* 2019: Continuous compile-time testing of assumptions we're making (#15391)
* 2019: Continuous testing of fuzz test cases under Valgrind (#17633, #18159, #18166)
* 2020: Finally... MemorySanitizer – MSAN! :)
What is the next step? What tools should we add to CI to keep bugs from entering `master`? :)
ACKs for top commit:
MarcoFalke:
ACK 870f0cd2a0
Tree-SHA512: 38327c8b75679d97d469fe42e704cacd1217447a5a603701dd8a58ee50b3be2c10248f8d68a479ed081c0c4b254589d3081c9183f991640b06ef689061f75578
7027c67cac