Looking at the mail archive it appears that my message was cut off. The
remainder:
>From a compile standpoint, there is no problem -- the codegen is built with
-DCODEGEN so it won't include the generated file, which of course wouldn't
even exist on the first pass. But since CMake doesn't preprocess headers,
it creates a circular dependency situation, where the code generator
"depends" on files which it generates. This causes unnecessary rebuilds,
since the code generator gets rebuilt after every time it regenerates files.
I thought I could create a dummy "GeneratedFile.h" in the directory
containing the codegen files, and put this into the CMakeLists.txt in that
directory:
include_directories(
BEFORE
${PROJECT_SOURCE_DIR}/src/codegen
)
That seemed to work the first time -- if I looked at the codegen's
depend.make file I saw lines like "SomeUtilityFile.cpp.o:
..../codegen/GeneratedFile.h" -- the dummy version of the file.
The problem is that CMake seems to have a global dependency cache, so once
SomeUtilityFile.cpp gets built for the program, the dependency globally
changes to the real GeneratedFile.h.
Any ideas to make this work, or other ways I can work around the problem?
Thank you
-dan
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