On 19/12/2023 10:56, Tao.Zeng--- via Gcc-help wrote:
Dear GCC-HELP:
I am look for if there is a command which can generate CRC of a structure by GCC.
My problem is that there is a data structure used to pass paramters from one binary to another binary. They have same definition but in different header files. These files are put in differerent folder and build for different binaries. Once somebody changed it's definition in file A but fogot do same change in file B, then the data parameters are not match, and the problems is hard to check. So I want to know if there is any GCC command which can generate a crc or any other characteristic value which I can stored in each binary and check characteristic value/crc first before using them, so we can detect errors at first time.
Could you help me for this problem? Thanks.
You are trying to get some kind of checksum of source code here? That
is not something you will get within GCC.
The best solution for you will depend on your build systems and your
development structure. Probably the best idea is to put the structure
definition, and any other common features, in a /single/ dedicated
header that is included by the files for both binaries.
If I am working with different programs that have to match on a
particular data structure, I put a version number for the structure in
the code. When I change the structure, I change the version number. At
run time, if one program wants to exchange data with the other via this
structure, they first compare structure version numbers. This lets
things work (to at least some extent) even if the two sides of the
exchange are separate and perhaps different generations of the software.
If you really need to checksum source code, it must be handled by your
build system somehow. Maybe you could have a "makefile" rule that runs
md5sum on the file, and passes it through a sed filter to generate
another header file with a checksum stamp macro that you can check? Or
use "diff" or "cmp" to compare the files as part of the build process,
failing if they differ?
I think this is all well out of scope for the compiler.
