Meson-generated config.h file don't allow C++ style comments (//)

[brunvonlope]

Describe the bug
If you use something like conf.configuration_data() and conf.set('var_name', var_value), the produced config.h file will have a C-style header:

/*
 * Autogenerated by the Meson build system.
 * Do not edit, your changes will be lost.
 */

Inno Setup scripts are not compatible with that, they need a C++ style comment comment and I see no option in https://mesonbuild.com/Configuration.html to change that.

Creating a custom config.h file from config.h.in with configure_file isn't doable because GIMP defines more than 80 variables.

To Reproduce
Create a meson.build file with:

conf.configuration_data()
conf.set('var_name', var_value)

Run meson setup

Expected behavior
config.h file have C++ style comment, which is more universal(?), or option to choose it if it isn't the default

system parameters

• Native build
• Windows 11
• Python 3.12.9 (MSYS2)
• Meson 1.7.0 (MSYS2)

[eli-schwartz]

config.h file have C++ style comment, which is more universal(?),

Technically no, single-line comments // were added later on in c99 and the original comment style was multi-line block comments /*

[bruchar1]

I guess we could add a c++ output format.