yamt commented on a change in pull request #2064:
URL: https://github.com/apache/incubator-nuttx/pull/2064#discussion_r517828776



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File path: boards/sim/sim/sim/scripts/Make.defs
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@@ -72,11 +72,16 @@ NM = $(CROSSDEV)nm
 OBJCOPY = $(CROSSDEV)objcopy
 OBJDUMP = $(CROSSDEV)objdump
 
+# Note: -fshort-wchar for the case where NuttX and the host OS have
+# differnt wchar_t. On Nuttx, it's uint16_t. On macOS, it's 32-bit.
 CFLAGS := $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
-   $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe
+   $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRAFLAGS) -pipe \
+   -fshort-wchar

Review comment:
       i don't know how CPPFLAGS is designed.
   the majority of the current uses of PREPROCESS in the tree are for C files, 
it seems.
   




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