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cmake: toolchain_cc_imacros: don't use space separated arguments
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 <firstname.lastname@example.org>
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