cmake: clang: set no_track_macro_expansion properly

Compiler property no_track_macro_expansion is controlled by
CONFIG_COMPILER_TRACK_MACRO_EXPANSION.
When that Kconfig is set to Y, clang fails with the following error
message:

   unknown argument: '-ftrack-macro-expansion=0'

This commit modifies clang/compiler_flags.cmake so that there is a
proper clang compiler option for this flag.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

cmake/compiler/clang/compiler_flags.cmake

@@ -137,6 +137,9 @@ set_compiler_property(PROPERTY linker_script -Wl,-T)
 # clang flag for colourful diagnostic messages
 set_compiler_property(PROPERTY diagnostic -fcolor-diagnostics)
 
+# clang flag to disable macro backtrace in diagnostics (can't fully disable it, so limit to 1)
+set_compiler_property(PROPERTY no_track_macro_expansion "-fmacro-backtrace-limit=1")
+
 set_compiler_property(PROPERTY no_global_merge "-mno-global-merge")
 
 set_compiler_property(PROPERTY specs)