Extra linker flags without -Wl, prefix

Sometimes you need to pass extra flags to GCC linker without Wl,. You could use build_flags option but it will not work. PlatformIO will not parse these flags to LINKFLAGS scope. In this case, simple extra script will help:

platformio.ini:

[env:env_extra_link_flags]
platform = windows_x86
extra_scripts = extra_script.py

extra_script.py (place it near platformio.ini):

Import("env")

#
# Dump build environment (for debug)
# print(env.Dump())
#

env.Append(
  LINKFLAGS=[
      "-static",
      "-static-libgcc",
      "-static-libstdc++"
  ]
)