michaelh/zephyr
1
0
Fork 0
Code Releases Activity

cmake: Add GCC -Og flag fallback to -O0.

Browse source 
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>
This commit is contained in:
Stephanos Ioannidis 2019-11-12 21:50:39 +09:00 • committed by Ioannis Glaropoulos
commit cff94bf7a0
1 changed files with 7 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

6
cmake/compiler/gcc/target_optimizations.cmake
View file

@ -15,7 +15,13 @@ macro(toolchain_cc_optimize_for_no_optimizations_flag dest_var_name)
endmacro()
macro(toolchain_cc_optimize_for_debug_flag dest_var_name)
# -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()
endmacro()
macro(toolchain_cc_optimize_for_speed_flag dest_var_name)