ARMC6 support required ARM compiler support as mandatory requirement which
should not be the case. Cortex-M23/M33 devices are not suuported by ARM compiler5
Adding ARMC6 without ARM in target.json should work now.
While ARMC6 does use the same linker (armlink) as ARM Compiler 5, it
is not compatible.
The reason for this incompatibility are twofold:
* armlink may invoke the C preprocessor by adding a shebang
(`#!`) to the top of their input files.
* ARMC6 and ARMC5 differ in how you invoke the preprocessor:
* ARMC5: `#! armcc -E`
* ARMC6: `#! armclang -E`
This forces the tools to rewrite the shebang if it's wrong.
This does not yet handle dependencies properly
inc paths might be a list or might not be (just single string). If they don't, we are ending up with non valid include paths (one letter include paths).
This as result would not compile.
targets.json contained a key for some targets, `OUTPUT_EXT`, which I
moved to `Target`, the root of all targets. Following on that, the tools
now use this extension provided by `OUTPUT_EXT` to determine the file
type of the output executable.
An earlier patch in this series relies on the assumption that all
toolchain construction goes through `prepare_toolchain`. This is still
not the case. The only remaining user of the `mbedToolchain` object that
does not go through `prepare_toolchain` is the static analysis scanner.
It's basically dead-code at this point. I say we remove it. So this
patch removes it.
This is a bug fix for the following bug (Github issue #437):
If two builds were run specifying a non-default build folder, the second
build would fail to link with duplicate symbols and may not fit on the
device. The root of this problem is that these non-default build folders
are not ignored by scan-resources, and therefore included in the build.
We fix this bug by ignoring the build directory passed into the tools.
Resolves the github issue #3790: Blinky fails to build (on Mac) after
addition of linker script preprocessing feature. Paraphrasing, this
issue is that Homebrew on mac does not install `arm-none-eabi-gcc` in
the same location as `arm-none-eabi-cpp`, the C Pre-Processor. The tools
prior to this commit, and after turning on the pre-processing of the
linker-script will fail on any Mac homebrew installed toolchains.
This commit resolves the above issue by allowing the toolchain's path to
the executable to remain empty after a call to `check_executable`. When
this path is empty, the tools will search the PATH environment variable
for the executable.