It replaces
make BOARD=iotlab-m3 info-debug-variable-NEWLIB_INCLUDE_DIR
/usr/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/include/
with
make BOARD=iotlab-m3 info-debug-variable-NEWLIB_INCLUDE_DIR
/usr/arm-none-eabi/include
Without trailing slash and without relative '..' everywhere.
It also uses `realpath` instead of `abspath` to support Mingw32.
Some versions of Mingw32 abspath implementation has trouble working with
windows formatted path.
$(abspath "C:/A/B") returns "/C/CUR/DIR/C:/A/B" instead of "/C/A/B"
relpath does not have this problem, it does additional symlink resolution but is
not a problem.
Note: on windows it does not remove the trailing `/`.
https://github.com/zephyrproject-rtos/zephyr/issues/2061#issuecomment-331635063
Patched in
941059c69f
Only keep lines that are indeed include path.
It also keeps newlines as they do not matter.
It fixes Mingw32 support where `grep '^\s'` is not working the same way.
It also handles some mac `sed` that do not support `\s`.
Ouput tested with:
make -C examples/hello-world BOARD=samr21-xpro info-debug-variable-COMPILER_INCLUDE_PATHS
# by also putting newlines for readability
Now:
/usr/bin/../lib/gcc/arm-none-eabi/7.2.1/include
/usr/bin/../lib/gcc/arm-none-eabi/7.2.1/include-fixed
/usr/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/include
Before:
/usr/bin/../lib/gcc/arm-none-eabi/7.2.1/cc1 -E -quiet -v -iprefix /usr/bin/../lib/gcc/arm-none-eabi/7.2.1/ -isysroot /usr/bin/../arm-none-eabi -D__USES_INITFINI__ /dev/null
/usr/bin/../lib/gcc/arm-none-eabi/7.2.1/include
/usr/bin/../lib/gcc/arm-none-eabi/7.2.1/include-fixed
/usr/bin/../lib/gcc/arm-none-eabi/7.2.1/../../../../arm-none-eabi/include
When NEWLIB_INCLUDE_DIR is set from other parts than 'COMPILER_INCLUDE_PATHS' it
does not have a trailing slash.
Also, it makes it more problematic when supplying it from the command line.
And anyway having two '/' does not break anything.
In the previous state, with llvm and arm for example, newlib-nano include dir
NEWLIB_NANO_INCLUDE_DIR is placed after NEWLIB_INCLUDES and so the default
'newlib.h' is used instead of the nano version.
