Commit f57ba2d30c ("cmake: toolchain_cc_imacros: don't use space
separated arguments") moved toolchain_cc_imacros() to using the long
argument format in order to avoid spaces that CMake uses to delimitate
and deduplicate arguments.
It seems that xcc doesn't support the --imacros=foo form. However
it does support the short "combined" -imacrosfoo form (without space).
So let's use that instead and document the caviat.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Because CMake explicitly deduplicates arguments, it is not possible
to use toolchain_cc_imacros() multiple times as the later "-imacros"
are stripped away, leaving the associated file arguments dangling.
The documented workaround in the CMake manual involves some "SHELL:..."
construct but that doesn't get through zephyr_compile_options()
undammaged.
Let's simply remove this issue altogether by replacing "-imacros x.h"
with the joined form "--imacros=x.h" instead. Both gcc and clang
support this syntax.
FYI, this joined form is also available for other arguments such as:
-include x.h --> --include=x.h
-A foo --> --assert=foo
-D foo --> --define-macro=foo
-U foo --> --undefine-macro=foo
Etc.
Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
The macro is intended to abstract the -imacros compiler option for
inclusion of the autoconf.h header file. The abstraction allows for a
given toolchain to decide how the inclusion of the header file is to
be done.
The intent here is to abstract Zephyr's dependence on toolchains,
thus allowing for easier porting to other, perhaps commercial,
toolchains and/or usecases.
No functional change expected.
Signed-off-by: Danny Oerndrup <daor@demant.com>
