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Enable various compilation flags to reduce the binary size (#401)

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* Add the following compilation flags:
 * -fno-exceptions and -fno-non-call-exceptions : disable exception handling
 * -fno-rtti : disable run time type information (needed by dynamic_cast, for example)

These flags reduce the binary size by about 100KB!

Also, -fstack-usage generate debug info (not in final binary) to allow tools like Puncover to do a stack analysis.

* Remove unused CMake variables in CMake_nRF5x.cmake (duplicated in src/CMakeLists.txt).
Replace -O0 by -Og in DEBUG builds. This generates a smaller binary (small enough for the internal memory) that is debugger friendly.
This commit is contained in:
JF002
2021-06-01 21:03:01 +02:00
committed by GitHub
parent c0b0f8cb73
commit 1b6acdedc2
3 changed files with 38 additions and 53 deletions
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15
cmake-nRF5x/CMake_nRF5x.cmake
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@@ -74,21 +74,6 @@ macro(nRF5x_setup)
)
endif ()
set(COMMON_FLAGS "-MP -MD -mthumb -mabi=aapcs -Wall -g3 -ffunction-sections -fdata-sections -fno-strict-aliasing -fno-builtin --short-enums ${CPU_FLAGS} -Wreturn-type -Werror=return-type")
# compiler/assambler/linker flags
set(CMAKE_C_FLAGS "${COMMON_FLAGS}")
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O0 -g3")
set(CMAKE_C_FLAGS_RELEASE "${CMAKE_C_FLAGS_RELEASE} -O3")
set(CMAKE_CXX_FLAGS "${COMMON_FLAGS}")
set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -O0 -g3")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3")
set(CMAKE_ASM_FLAGS "-MP -MD -x assembler-with-cpp")
set(CMAKE_EXE_LINKER_FLAGS "-mthumb -mabi=aapcs -L ${NRF5_SDK_PATH}/modules/nrfx/mdk -T${NRF5_LINKER_SCRIPT} ${CPU_FLAGS} -Wl,--gc-sections --specs=nano.specs -lc -lnosys -lm")
# note: we must override the default cmake linker flags so that CMAKE_C_FLAGS are not added implicitly
set(CMAKE_C_LINK_EXECUTABLE "${CMAKE_C_COMPILER} <LINK_FLAGS> <OBJECTS> -o <TARGET> <LINK_LIBRARIES>")
set(CMAKE_CXX_LINK_EXECUTABLE "${CMAKE_C_COMPILER} <LINK_FLAGS> <OBJECTS> -lstdc++ -o <TARGET> <LINK_LIBRARIES>")
# basic board definitions and drivers
include_directories(
"${NRF5_SDK_PATH}/components"