Add a GCC build to the QEMU/IAR project (#728)

* Rename the CORTEX_MPS2_QEMU_IAR directory to CORTEX_MPS2_QEMU_IAR_GCC

* Add makefile and startup.c.

* GCC build is working, but not yet running.

* Add eclipse project.

* Tidy up the linker file.
Add the debug launch file to the file system.

* Add printf-stdarg.c to the GCC build.

* Increase heap size for the GCC build.

* Copy IAR project files into a dedicated IAR build directory.

* Delete the IAR project from its original location now it is in its own build directory.

* Update headers to correct version number.

* Update lexicon.txt.

* Update core_checker.py.

* Change line endings in lexicon.txt.

* Increase the stack size of the task that prints out strings.

* Update linker script to build with older ld versions.

* Add links to the online documentation page for this demo.

* Fix line endings

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

* Remove linker and project files from header check

Eclipse project files have names .project and .cproject. Python splitext
will treat these as file names and not as extension and as a result, it
is not enough to just add these to ignored extension list. Instead, we
need to add them to ignored files list.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

* Remove startup files from header check

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

Co-authored-by: RichardBarry <richardbarry.c@gmail.com>
Co-authored-by: none <>
Co-authored-by: Gaurav Aggarwal <aggarg@amazon.com>

lexicon.txt

@@ -2937,6 +2937,7 @@ uxtaskgetsystemstate
 uxtaskgettasknumber
 uxtaskpriority
 uxtaskpriorityget
+uxtb
 uxtick
 uxtxstackbuffer
 uxvariabletoincrement