try_compile(): handle empty CMAKE_TRY_COMPILE_CONFIGURATION (!6344) · Merge requests · CMake / CMake

Alexander Richardson requested to merge arichardson/cmake:try-compile-cmp0066-default-build-type into master Jul 13, 2021

If CMAKE_TRY_COMPILE_CONFIGURATION is not set, the generated CMake project sets CMAKE_<LANG>_FLAGS_DEBUG, but does not set CMAKE_BUILD_TYPE to Debug so those flags will be ignored. I noticed this because poppler's configure checks were failing when cross-compiling for CHERI-RISC-V due to missing -mabi/-march flags. This happens because poppler's build system overrides CMAKE_C_FLAGS and appends the user/toolchain-provided flags to CMAKE_C_FLAGS_<CONFIG>.

See https://gitlab.freedesktop.org/poppler/poppler/-/merge_requests/887

Fixes: #22414 (closed)

Edited Jul 13, 2021 by Alexander Richardson

try_compile(): handle empty CMAKE_TRY_COMPILE_CONFIGURATION

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