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cmake: improve the check of optimization level against CMAKE_BUILD_TYPE

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Fixes: #39626

The CMAKE_C_FLAGS_<build_type> is a string with arguments separated by
spaces and not a list, for example "-O3 -DNDEBUG".

Therefore update the `if()` check to do a regex match to determine if
the optimization level specified through Kconfig matches the
optimization level that would be defined by the CMAKE_BUILD_TYPE
setting.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>
This commit is contained in:
Torsten Rasmussen 2021-12-10 15:06:30 +01:00 committed by Carles Cufí
parent d9f0ca3943
commit 05bb85523c
1 changed files with 5 additions and 2 deletions
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7
CMakeLists.txt
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@ -1715,8 +1715,11 @@ set(build_types None Debug Release RelWithDebInfo MinSizeRel)
if((CMAKE_BUILD_TYPE IN_LIST build_types) AND (NOT NO_BUILD_TYPE_WARNING))
string(TOUPPER ${CMAKE_BUILD_TYPE} CMAKE_BUILD_TYPE_uppercase)
if(NOT (${OPTIMIZATION_FLAG} IN_LIST CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_uppercase}))
# The CMAKE_C_FLAGS_<build_type> is a string, so we do a regex to see if the
# optimization flag is present in that string.
# To avoid false-positive matches, the flag must either be matched first
# or last in string, or come after / followed by minimum a space.
if(NOT (CMAKE_C_FLAGS_${CMAKE_BUILD_TYPE_uppercase} MATCHES "(^| )${OPTIMIZATION_FLAG}($| )"))
message(WARNING "
The CMake build type was set to '${CMAKE_BUILD_TYPE}', but the optimization flag was set to '${OPTIMIZATION_FLAG}'.
This may be intentional and the warning can be turned off by setting the CMake variable 'NO_BUILD_TYPE_WARNING'"