forked from OSchip/llvm-project
ba46a47e07
Let me tell you a story. Suppose you want to build your project (e.g. LLVM) with CMake 2.8, Clang and AddressSanitizer. You also want to ensure that Clang is fresh enough and check that CMAKE_CXX_COMPILER_VERSION is 3.1+. This check would fail - CMake would fail to correctly calculate compiler version if you pass CMAKE_CXX_FLAGS=-fsanitize=address. The problem is funky compiler version calculation in CMakeDetermineCompilerId.cmake module: it compiles the sample source file with provided compiler and compile flags, runs "strings" and greps for "INFO:" ASCII strings contained on the executable to fetch "INFO:compiler", "INFO:compiler_version" etc. It limits the output of grep to just 4 lines. Unfortunately, if your executable was built with ASan, it would also contain an ASCII string INFO: %s ignores mlock/mlockall/munlock/munlockall and INFO:compiler_version string would never be parsed. All of the above actually happened after r243574 when we tried to configure libcxx with just-built Clang with TSan/MSan, and the version check mentioned above failed in HandleLLVMOptions.cmake (╯°□°)╯.~.┻━┻ llvm-svn: 243599 |
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|---|---|---|
| clang | ||
| clang-tools-extra | ||
| compiler-rt | ||
| debuginfo-tests | ||
| libclc | ||
| libcxx | ||
| libcxxabi | ||
| libunwind | ||
| lld | ||
| lldb | ||
| llgo | ||
| llvm | ||
| openmp | ||
| polly | ||