cff94bf7a0
The -Og (optimise for debugging) flag is only available for GCC 4.8.0 and above, and specifying it for a GCC version lower than 4.8.0 will result in a compilation error. This commit adds a check for compiler -Og optimisation flag support and a fallback to -O0 (disable optimisation) when -Og flag is unsupported. Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
34 lines
1.2 KiB
CMake
34 lines
1.2 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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# See root CMakeLists.txt for description and expectations of this macro
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#
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# NOTE: Some GNU toolchains break with plain '-Os' or '-Og', but is fixable
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# with tweaks. So allow user to override, via ifndef, the compile flags that
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# CONFIG_{NO,DEBUG,SPEED,SIZE}_OPTIMIZATIONS will cause, yet still leaving the
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# selection logic in kconfig.
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#
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# These macros leaves it up to the root CMakeLists.txt to choose the CMake
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# variable names to store the optimization flags in.
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macro(toolchain_cc_optimize_for_no_optimizations_flag dest_var_name)
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set_ifndef(${dest_var_name} "-O0")
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endmacro()
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macro(toolchain_cc_optimize_for_debug_flag dest_var_name)
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# -Og optimisation flag is only supported from gcc 4.8.0 and above.
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# Fall back to using -O0 flag if running an older gcc version.
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if(CMAKE_C_COMPILER_VERSION VERSION_LESS "4.8.0")
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set_ifndef(${dest_var_name} "-O0")
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else()
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set_ifndef(${dest_var_name} "-Og")
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endif()
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endmacro()
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macro(toolchain_cc_optimize_for_speed_flag dest_var_name)
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set_ifndef(${dest_var_name} "-O2")
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endmacro()
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macro(toolchain_cc_optimize_for_size_flag dest_var_name)
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set_ifndef(${dest_var_name} "-Os")
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endmacro()
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