What mean file with extension “h.in”?

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梦谈多话
梦谈多话 2020-12-24 11:13

I am studying the C language, and I saw a new extension that I had not seen before.

What do files with the extension like library.h.in mean?

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  • 2020-12-24 12:02

    These files are usually the input for autoconf which will generate final .h files.

    Here's an example from PCRE:

    #define PCRE_MAJOR          @PCRE_MAJOR@
    #define PCRE_MINOR          @PCRE_MINOR@
    #define PCRE_PRERELEASE     @PCRE_PRERELEASE@
    #define PCRE_DATE           @PCRE_DATE@
    

    Autoconf will replace all variables (@…@) with the respective values and the result will be a .h file.

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  • 2020-12-24 12:09

    Typically, a .h.in file is a header template that is filled in to become the actual header by a configure script based on the outcome of several tests for features present on the target platform.

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  • 2020-12-24 12:09

    Files ending with .in are typically template files used by a program called configure that generates a new file without the extension after substituting for variable expansions. I.e., if you're looking at a source tree that has files called, e.g. Makefile.in in the tree, then ./configure will generate a usable Makefile that can be used to "make" from source.

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