CMakeLists.txt: allow flags passed on the command line to win over bu… #107
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…ilt-in flags CMakeLists.txt and booster/CMakeLists.txt define some flags in CXX_FLAGS, and then set CMAKE_CXX_FLAGS in a way that causes the flags in CXX_FLAGS to override the ones passed (for example on the command line through CMAKE_CXX_FLAGS). This prevents the user from overriding those compiler flags in CXX_FLAGS. A specific example is that CXX_FLAGS sets -std=c++11, but with recent version of ICU (such as >= 77-1), -std=c++11 is not enough, passing -std=c++17 is needed. Unfortunately, it cannot be passed through CMAKE_CXX_FLAGS due to the aforementioned problem. This commit allows to resolve this by ensuring that CMAKE_CXX_FLAGS and CMAKE_C_FLAGS win over CXX_FLAGS/C_FLAGS. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
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…ilt-in flags
CMakeLists.txt and booster/CMakeLists.txt define some flags in CXX_FLAGS, and then set CMAKE_CXX_FLAGS in a way that causes the flags in CXX_FLAGS to override the ones passed (for example on the command line through CMAKE_CXX_FLAGS). This prevents the user from overriding those compiler flags in CXX_FLAGS.
A specific example is that CXX_FLAGS sets -std=c++11, but with recent version of ICU (such as >= 77-1), -std=c++11 is not enough, passing -std=c++17 is needed. Unfortunately, it cannot be passed through CMAKE_CXX_FLAGS due to the aforementioned problem.
This commit allows to resolve this by ensuring that CMAKE_CXX_FLAGS and CMAKE_C_FLAGS win over CXX_FLAGS/C_FLAGS.