ClickHouse/cmake/add_warning.cmake

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CMake
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include (CheckCXXCompilerFlag)
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include (CheckCCompilerFlag)
# Try to add -Wflag if compiler supports it
macro (add_warning flag)
string (REPLACE "-" "_" underscored_flag ${flag})
string (REPLACE "+" "x" underscored_flag ${underscored_flag})
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check_cxx_compiler_flag("-W${flag}" SUPPORTS_CXXFLAG_${underscored_flag})
check_c_compiler_flag("-W${flag}" SUPPORTS_CFLAG_${underscored_flag})
if (SUPPORTS_CXXFLAG_${underscored_flag})
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -W${flag}")
else ()
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message (STATUS "Flag -W${flag} is unsupported")
endif ()
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if (SUPPORTS_CFLAG_${underscored_flag})
set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -W${flag}")
else ()
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message (STATUS "Flag -W${flag} is unsupported")
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endif ()
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endmacro ()
# Try to add -Wno flag if compiler supports it
macro (no_warning flag)
add_warning(no-${flag})
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endmacro ()
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# The same but only for specified target.
macro (target_add_warning target flag)
string (REPLACE "-" "_" underscored_flag ${flag})
string (REPLACE "+" "x" underscored_flag ${underscored_flag})
check_cxx_compiler_flag("-W${flag}" SUPPORTS_CXXFLAG_${underscored_flag})
if (SUPPORTS_CXXFLAG_${underscored_flag})
target_compile_options (${target} PRIVATE "-W${flag}")
else ()
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message (STATUS "Flag -W${flag} is unsupported")
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endif ()
endmacro ()
macro (target_no_warning target flag)
target_add_warning(${target} no-${flag})
endmacro ()