[CMake] Source modification using CMake

[Nicholas Yue]

Hi Brian,

  Have you consider ExternaProject() ? It has a patching feature.

https://cmake.org/cmake/help/v3.0/module/ExternalProject.html

Cheers

On Mon, 6 Nov 2017 at 07:35 brian heim <brianlheim at gmail.com> wrote:

> Hi list,
>
> Hope you're doing well. I have a question about using CMake to patch the
> source code in a project I work on. This is the situation:
>
> - Project includes C++ transpiled from a different specialized language
> - That transpiler is not cross-platform, so we include transpiled C++ in
> our source tree
> - The generated code does not compile with MSVC 2013 because of a bug
> (specifically
> https://support.microsoft.com/en-us/help/315481/bug-too-many-unnested-loops-incorrectly-causes-a-c1061-compiler-error
> )
> - Vendor of transpiler will not patch for this case, so we need to modify
> the source ourselves
>
> We don't want to _directly_ modify the source because that means we'll
> have to [remember to] do it on a regular basis, when new or updated source
> files are added. The patching is simple enough that it can be done with a
> regex. I am not very experienced with CMake, but I'm aware that two ways of
> modifying source files are:
>
> 1. configure_file(), which doesn't seem to give tools for this purpose.
> 2. file(READ ...) followed by file(WRITE ...). I've gotten my regex to
> work with it, but my attempt overwrites the source file in-place, unlike
> configure_file() which places the modified file in the build tree.
>
> Is there a way to do (2) correctly? By which I mean, can I do a form of
> configure_file() using a regex? Or is there an altogether easier solution
> that's staring me in the face?
>
> Thank you very much in advance for your help,
>
> Brian H
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