Steven Wilson wrote:
Hey all,
I have a large project whose source files start as files with an
alternate extension (.bc). Those files are mostly generic C files that
have some C++ like features that are preprocessed into vanilla C files
using a custom C pre-processor. My project uses an
add_custom_command() call to put the file through the necessary steps to
go from .bc to a .c file. By the time it becomes a .c file, the C
preprocessor(and the custom preprocessor) has already run and all the
header files, etc have been put into the .c file. I need a way to
generate a list of dependencies (ie header files) for the original .bc
file so that my add_custom_command() call can use those file names in
the DEPEND section so that the .c file gets regenerated correctly when
any of the dependencies change.
I know different techniques for getting this information into CMake once
the list is compiled for any give source file, but I'm not sure how to
generate the list. Can CMake's C dependency scanner be invoked (using
cmake -E cmake_depends) to create this kind of list. The .bc files are
generic C (from a preprocessor scanning point of view) so CMake's
dependency scanner should be able to produce this information. If
cmake -E cmake_depends cannot function for this task, does anyone know
of another tool that could be forced into service for this type of
functionality?
I have a hack of an idea that might work....
If you could changed your bc -> c generator to put in the #include lines
, but with if blockers around it:
#if FOOL_CMAKE_DEPEND_SCANNER
#include "foo.h"
#include "bar.h"
#endif
Since CMake ignores #if directives will depend on foo and bar, but the c
compiler will not expand them.
-Bill
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