michaelh/zephyr
1
0
Fork 0
Code Releases Activity

cmake: kconfig: Add new abstraction for -Oz optimization level

Browse source 
Both Clang [1] and (recently) GCC [2] support this flag to enable
additional codesize optimizations beyond -Os, possibly at the expense of
performance.

This tradeoff is worthwhile for some (and, Clang's -Oz seems to be
closer to GCC's -Os currently), so add a new abstraction for this flag
so users can select it as appropriate.

[1] https://clang.llvm.org/docs/CommandGuide/clang.html#cmdoption-O0
[2] https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html#index-Oz

Signed-off-by: Jonathon Penix <jpenix@quicinc.com>
This commit is contained in:
Jonathon Penix 2024-03-20 10:29:51 -07:00 • committed by Anas Nashif
commit d6041d62b3
6 changed files with 14 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

1
cmake/compiler/gcc/compiler_flags.cmake
View file

@ -20,6 +20,7 @@ else()
endif()
set_compiler_property(PROPERTY optimization_speed -O2)
set_compiler_property(PROPERTY optimization_size -Os)
set_compiler_property(PROPERTY optimization_size_aggressive -Oz)
if(CMAKE_C_COMPILER_VERSION GREATER_EQUAL "4.5.0")
set_compiler_property(PROPERTY optimization_lto -flto)