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cmake: Improve AVR target flags 

- Filter C++-only flags correctly
- Split sections correctly at link time with LTO
- Remove uneeded linker flags
pull/207/head
Yuri D'Elia 2022-10-02 00:20:45 +02:00
parent c6b600d623
commit 74dfb27c20
1 changed files with 9 additions and 6 deletions
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15
CMakeLists.txt
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@ -113,14 +113,17 @@ if(CMAKE_CROSSCOMPILING)
add_compile_options(${MCU_FLAGS}) add_compile_options(${MCU_FLAGS})
add_link_options(${MCU_FLAGS}) add_link_options(${MCU_FLAGS})
# disable some C++ language features
add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fno-threadsafe-statics>)
add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>)
# disable exceptions
add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fno-exceptions>)
add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fno-unwind-tables>)
# split and gc sections # split and gc sections
add_compile_options(-ffunction-sections -fdata-sections) add_compile_options(-ffunction-sections -fdata-sections)
add_link_options(-Wl,--gc-sections) add_link_options(-ffunction-sections -fdata-sections -Wl,--gc-sections)
# disable exceptions and related metadata
add_compile_options(-fno-exceptions -fno-unwind-tables)
add_compile_options($<$<COMPILE_LANGUAGE:CXX>:-fno-rtti>)
add_link_options(-Wl,--defsym,__exidx_start=0,--defsym,__exidx_end=0)
else() else()
if(CMAKE_BUILD_TYPE STREQUAL "Debug") if(CMAKE_BUILD_TYPE STREQUAL "Debug")
add_compile_options(-O0) add_compile_options(-O0)