Meson: Use out-of-nothing GIT projects as dependencies

Meson project dependency processing: cleverly solves the problem of dependency on Git project without Meson.build files

Many excellent Git projects lack Meson.build files, which presents challenges for developers using Meson build systems. This article will introduce a way to solve this problem by creating a patch file and successfully add a Git project without the Meson.build file to your Meson project as a subproject.

Suppose you need to add benhoyt/ht project (which does not have a Meson.build file) to your project as a subproject. You can use Meson's wrap mechanism, but you need to add the Meson.build file manually.

First, create a ht.wrap file and specify the Git repository information:

 <code>[wrap-git] directory=ht url=https://github.com/benhoyt/ht revision=master depth=1</code>

Then, download the subproject:

 <code class="language-bash">meson subprojects ht</code>

Next, create an empty meson.build file in subprojects/ht directory:

 <code class="language-bash">touch ./subprojects/ht/meson.build</code>

Now, create a patch file containing the meson.build file:

 <code class="language-bash">mkdir -pv subprojects/{packagecache,packagefiles} git -C ./subprojects/ht add meson.build git -C ./subprojects/ht diff --cached > ./subprojects/packagefiles/ht-meson.patch</code>

Finally, add the patch file to the ht.wrap file:

 <code class="language-bash">echo "diff_files = ht-meson.patch" >> ./subprojects/ht.wrap</code>

Now you can run the Meson build system:

 <code class="language-bash">CC=gcc meson setup ./build --wipe -D b_sanitize=none -D buildtype=release meson compile -C ./build</code>

After the compilation is successful, the executable file will appear in the ./build directory.

Summary: By creating the meson.build file and the corresponding patch, you can easily add a Git project without the Meson.build file to your Meson project as a subproject. This approach avoids modifying the original project and maintains the integrity of the project.

Reference information:

• Meson Subprojects: https://www.php.cn/link/aaddcd13798c7609e4c6479d1a4f67c9
• GCC 14.2.0: https://www.php.cn/link/9a912f218d27a625d946ed56081d9123
• Meson 1.7.0
• Ninja 1.12.1
• GNU Emacs 30
• Debian Sid
• GNU Guix

(Note: This article assumes that you have installed necessary tools such as Meson, GCC and Ninja. The content of the meson.build file needs to be written according to the actual situation of the ht project.)

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