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zephyr/cmake/compiler/gcc/target_optimizations.cmake

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license: cleanup: add SPDX Apache-2.0 license identifier Update the files which contain no license information with the 'Apache-2.0' SPDX license identifier. Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of Zephyr, which is Apache version 2. Signed-off-by: Anas Nashif <anas.nashif@intel.com>
2019-04-06 15:08:09 +02:00
# SPDX-License-Identifier: Apache-2.0
cmake: Toolchain abstraction: optimizations Introduce toolchain_cc_optimize_for_* family of macros. Each macro represents a general optimization class. Each macro is then responsible for setting an output variable to that class-of-optimization's flag. The names of these output variables are decided from the root CMakeLists.txt. No functional change expected. Clang's optimization flags are compatible with gcc, and are thus inherited. This is motivated by the wish to abstract Zephyr's usage of toolchains, permitting easier porting to other (commercial) toolchains. Signed-off-by: Mark Ruvald Pedersen <mped@oticon.com>
2019-01-30 10:12:30 +01:00
# See root CMakeLists.txt for description and expectations of this macro
#
# NOTE: Some GNU toolchains break with plain '-Os' or '-Og', but is fixable
# with tweaks. So allow user to override, via ifndef, the compile flags that
# CONFIG_{NO,DEBUG,SPEED,SIZE}_OPTIMIZATIONS will cause, yet still leaving the
# selection logic in kconfig.
#
# These macros leaves it up to the root CMakeLists.txt to choose the CMake
# variable names to store the optimization flags in.
macro(toolchain_cc_optimize_for_no_optimizations_flag dest_var_name)
set_ifndef(${dest_var_name} "-O0")
endmacro()
macro(toolchain_cc_optimize_for_debug_flag dest_var_name)
cmake: Add GCC -Og flag fallback to -O0. The -Og (optimise for debugging) flag is only available for GCC 4.8.0 and above, and specifying it for a GCC version lower than 4.8.0 will result in a compilation error. This commit adds a check for compiler -Og optimisation flag support and a fallback to -O0 (disable optimisation) when -Og flag is unsupported. Signed-off-by: Stephanos Ioannidis <root@stephanos.io>
2019-11-12 13:50:39 +01:00
# -Og optimisation flag is only supported from gcc 4.8.0 and above.
# Fall back to using -O0 flag if running an older gcc version.
if(CMAKE_C_COMPILER_VERSION VERSION_LESS "4.8.0")
set_ifndef(${dest_var_name} "-O0")
else()
set_ifndef(${dest_var_name} "-Og")
endif()
cmake: Toolchain abstraction: optimizations Introduce toolchain_cc_optimize_for_* family of macros. Each macro represents a general optimization class. Each macro is then responsible for setting an output variable to that class-of-optimization's flag. The names of these output variables are decided from the root CMakeLists.txt. No functional change expected. Clang's optimization flags are compatible with gcc, and are thus inherited. This is motivated by the wish to abstract Zephyr's usage of toolchains, permitting easier porting to other (commercial) toolchains. Signed-off-by: Mark Ruvald Pedersen <mped@oticon.com>
2019-01-30 10:12:30 +01:00
endmacro()
macro(toolchain_cc_optimize_for_speed_flag dest_var_name)
set_ifndef(${dest_var_name} "-O2")
endmacro()
macro(toolchain_cc_optimize_for_size_flag dest_var_name)
set_ifndef(${dest_var_name} "-Os")
endmacro()
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