how to find all *.c files for Cmake build system

Question

I want to find all .c files under a directory and add them all to SRC files to compile in cmake. How can I do this in CMakeList.txt.

for regular makefiles I can create

SPECIFIED_SRC_FILE = $(foreach d,$(SPECIFIED_SRC_DIRS),$(wildcard $(addprefix $(d)/,.c)))

bu I couldn't get how to do something like this in CMakeList.txt.

Thank you for your help...

Answer 1

Try this:

 AUX_SOURCE_DIRECTORY:
     Find all source files in a directory. 


  AUX_SOURCE_DIRECTORY(dir VARIABLE) 

Collects the names of all the source files in the
specified directory and stores the list in the variable provided. This command
is intended to be used by projects that use explicit template instantiation.
Template instantiation files can be stored in a "Templates"
subdirectory and collected automatically using this command to avoid manually
listing all instantiations.


It is tempting to use this command to avoid writing
the list of source files for a library or executable target. While this seems
to work, there is no way for CMake to generate a build system that knows when a
new source file has been added. Normally the generated build system knows when
it needs to rerun CMake because the CMakeLists.txt file is modified to add a
new source. When the source is just added to the directory without modifying
this file, one would have to manually rerun CMake to generate a build system
incorporating the new file. 

Answer 2

You can use AUX_SOURCE_DIRECTORY as @whitequark described, but it won't really work as you expect, as CMake will be unable to determine when new files are added (which is kind of the whole point with using a wildcard).

Answer 3

How about the good old globbing?

FILE(GLOB MyCSources *.c)

ADD_EXECUTABLE(MyExecutable ${MyCSources})