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Various of the solenv/gbuild/LINUX_*_GCC.mk (namely ARM, AXP, M86K, POWERPC64, S390, S390X) have lines 

  gb_CFLAGS += ...
  gb_CXXFLAGS += ...
to add additional flags before including linux.mk. However, these additions appear to not be effective, as unxgcc.mk (included from linux.mk) unconditionally resets those variables via 

  gb_CFLAGS := ...
  gb_CXXFLAGS := ...
(Also, moving the additions in the LINUX_*_GCC.mk files after including linux.mk wouldn't appear to help, either, as the ultimate use of these two variables is in 

  gb_LinkTarget_CFLAGS := $(gb_CFLAGS)
  gb_LinkTarget_CXXFLAGS := $(gb_CXXFLAGS)
in unxgcc.mk, so the latter variables would still not get the additions. The only correct way appears to be to have 

  gb_LinkTarget_CFLAGS += ...
  gb_LinkTarget_CXXFLAGS += ...
in the LINUX_*_GCC.mk files after including linux.mk. Similar problems may be present in other $(OS)_$(CPUNAME)_$(COM) files, too) 

Or what am I missing?

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