build_unflags does not apply to linker commands

[lerneaenhydra]

What kind of issue is this?

• Bug report. If you’ve found a bug, please provide information below.

Configuration

Operating system: Linux stm32dev-VirtualBox 4.4.0-24-generic #43-Ubuntu SMP Wed Jun 8 19:25:16 UTC 2016 i686 athlon i686 GNU/Linux

PlatformIO Version (platformio --version): PlatformIO, version 2.10.1

Description of problem

The build_unflags directive does not apply to the generated linker command. For example, when using the ststm32 platform the default flags '-nostartfiles' and '-nostdlib' are not removed when the configuration file contains 'build_unflags= -nostdlib -nostartfiles'

Steps to Reproduce

Compile any project using a platformio.ini file containing;
[env:disco_f407vg]
platform = ststm32
framework = spl
board = disco_f407vg
build_unflags = -nostdlib -nostartfiles

Actual Results

the following linker command is generated
arm-none-eabi-gcc -o .pioenvs/disco_f407vg/firmware.elf -Os -Wl,--gc-sections,--relax -mthumb -mcpu=cortex-m4 **-nostartfiles -nostdlib** -Wl,-T"stm32f405x6.ld" .pioenvs/disco_f407vg/src/backend/cbuf.o .pioenvs/disco_f407vg/src/backend/dsp_wrapper.o .pioenvs/disco_f407vg/src/backend/hw/board.o .pioenvs/disco_f407vg/src/backend/hw/headphone.o .pioenvs/disco_f407vg/src/backend/hw/microphone.o .pioenvs/disco_f407vg/src/backend/hw/stm32f4_discovery.o .pioenvs/disco_f407vg/src/backend/hw/stm32f4_discovery_audio_codec.o .pioenvs/disco_f407vg/src/backend/hw/stm32f4xx_it.o .pioenvs/disco_f407vg/src/backend/hw/system_stm32f4xx.o .pioenvs/disco_f407vg/src/backend/printf.o .pioenvs/disco_f407vg/src/backend/systime/systime.o .pioenvs/disco_f407vg/src/main.o -L/home/stm32dev/.platformio/packages/ldscripts -Llib_ext -L.pioenvs/disco_f407vg -Wl,--start-group -lc -lgcc -lm -lstdc++ -lnosys -lPDMFilter_GCC -larm_cortexM4l_math .pioenvs/disco_f407vg/libFrameworkCMSISVariant.a .pioenvs/disco_f407vg/libFrameworkSPL.a -Wl,--end-group

Expected Results

The above linker command without the -nostartfiles -nostdlib flags.

[ivankravets]

https://community.platformio.org/t/build-unflags-broken/392/13

[env:frdm_k64f]
platform = freescalekinetis
framework = mbed
board = frdm_k64f
build_unflags = -fno-rtti

I already put the env.ProcessUnFlags(env.get("BUILD_UNFLAGS")) after the framework script in platformio.py, but it´s still broken.

[ivankravets]

Please re-test the latest http://docs.platformio.org/en/latest/installation.html#development-version