How to Add -fexceptions and Other Linker/Compiler Flags in CMake?

How to Incorporate Linker and Compile Flags in a CMake File

When compiling with the arm-linux-androideabi-g compiler, adding exception handling requires the inclusion of the -fexceptions flag. While it works using the command line, the issue arises when attempting to compile using a CMake file.

To add the -fexceptions flag in CMake, follow these steps:

1. Define a Constant: Declare the flags as a constant.

SET(CMAKE_EXCEPTIONS_FLAG "-fexceptions")

2. Append to CMake Variables: Append the flag to the appropriate CMake variables.

SET(CMAKE_CXX_FLAGS  "${CMAKE_CXX_FLAGS} ${CMAKE_EXCEPTIONS_FLAG}")
SET(CMAKE_EXE_LINKER_FLAGS  "${CMAKE_EXE_LINKER_FLAGS} ${CMAKE_EXCEPTIONS_FLAG}")

3. Use Target Properties: Alternatively, use target properties to set the flags.

get_target_property(TEMP ${THE_TARGET} COMPILE_FLAGS)
if(TEMP STREQUAL "TEMP-NOTFOUND")
    SET(TEMP "")
else()
    SET(TEMP "${TEMP} ")
endif()
SET(TEMP "${TEMP}${CMAKE_EXCEPTIONS_FLAG}")
set_target_properties(${THE_TARGET} PROPERTIES COMPILE_FLAGS ${TEMP})

By implementing these steps, you can incorporate the necessary flags into your CMake file and successfully compile your code with the desired exception handling functionality.

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