embuild.exe optimization configuration

[SJahnke]

Hi Nordic,

i have a question regarding the emBuild.exe tool and the optimization level it will use during building a hex file. I'am using the following command combination for my built:

  emBuild.exe -config "Release" xxx.emProject -echo -verbose -rebuild

But i have no idea, if the emBuild.exe is really building an release? And if it does, on which level of optimization? After looking into the help of emBuild.exe there is no option, to configure this level? Any ideas, how to find out? Or does it always build with highest level 3 of optimization?

Thanks!

SJ

[SJahnke]

Okay...i think i've found the answer! It's of course the optimization level of the SES project, previously adjusted in the SES IDE. Am i right?

[Håkon Alseth]

You're right. With the echo command, you can also look at the "-O" parameter passed to the compiler:

3>Compiling 'system_nrf52.c'
3>/opt/segger/segger_embedded_studio_for_arm_4.50/gcc/arm-none-eabi/bin/cc1 -fmessage-length=0 -fno-diagnostics-show-caret -mcpu=cortex-m4 -mlittle-endian -mfloat-abi=hard -mfpu=fpv4-sp-d16 -mthumb -mtp=soft -munaligned-access -nostdinc -isystem/opt/segger/segger_embedded_studio_for_arm_4.50/include -I../../../config -I../../../../../../components -I../../../../../../components/boards -I../../../../../../components/drivers_nrf/nrf_soc_nosd -I../../../../../../components/libraries/atomic -I../../../../../../components/libraries/balloc -I../../../../../../components/libraries/bsp -I../../../../../../components/libraries/delay -I../../../../../../components/libraries/experimental_section_vars -I../../../../../../components/libraries/log -I../../../../../../components/libraries/log/src -I../../../../../../components/libraries/memobj -I../../../../../../components/libraries/ringbuf -I../../../../../../components/libraries/strerror -I../../../../../../components/libraries/util -I../../../../../../components/toolchain/cmsis/include -I../../.. -I../../../../../../external/fprintf -I../../../../../../integration/nrfx -I../../../../../../modules/nrfx -I../../../../../../modules/nrfx/hal -I../../../../../../modules/nrfx/mdk -I../config -D__SIZEOF_WCHAR_T=4 -D__ARM_ARCH_7EM__ -D__SES_ARM -D__ARM_ARCH_FPV4_SP_D16__ -D__HEAP_SIZE__=8192 -D__SES_VERSION=45000 -D__GNU_LINKER -DNDEBUG -DBOARD_PCA10040 -DBSP_DEFINES_ONLY -DCONFIG_GPIO_AS_PINRESET -DFLOAT_ABI_HARD -DINITIALIZE_USER_SECTIONS -DNO_VTOR_CONFIG -DNRF52 -DNRF52832_XXAA -DNRF52_PAN_74 -MD /opt/nrf5_sdk16/examples/peripheral/blinky/pca10040/blank/ses/Output/blinky_pca10040 Release/Obj/system_nrf52.d -MQ Output/blinky_pca10040 Release/Obj/system_nrf52.o -quiet -std=gnu99 -g3 -gpubnames -fdebug-types-section -Os -fomit-frame-pointer -fno-dwarf2-cfi-asm -fno-builtin -ffunction-sections -fdata-sections -fshort-enums -fno-common /opt/nrf5_sdk16/modules/nrfx/mdk/system_nrf52.c -o /opt/nrf5_sdk16/examples/peripheral/blinky/pca10040/blank/ses/Output/blinky_pca10040 Release/Obj/system_nrf52.asm

Really long line, but in my case it's "Os".

Cheers,

Håkon