改变gcc默认的include目录和link目录

最新推荐文章于 2023-11-13 22:56:55 发布

转载最新推荐文章于 2023-11-13 22:56:55 发布 · 1.4k 阅读

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#gcc #include #search #file #path #behavior

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本文深入探讨了GCC specs文件的用途、修改方法及应用实例，包括如何通过文本编辑器检查默认行为，如何自定义编译参数，以及如何在特定路径下添加头文件和库目录。详细介绍了如何通过修改specs文件来定制GCC的行为，以适应不同项目的编译需求。

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About Specs file

The "gcc" program invoked by users is a convenient front-end driver executable which will invoke other programs in the background such as cc1, as or ld to do its work according to the command line parameter given. A specs file is plain text used to control the default behavior for the "gcc" front-end. The specs file is usually built-in but for flexibility purposes, it can be overridden with an external version.

Basic Specs file modifications

GCC will produce a specs file via the following command.

gcc -dumpspecs > specs

You may use a text editor of your choice to inspect it. It may be confusing at first, but there are many places of interest. To use the specs file, invoke gcc with -specs=<path_to_specs_file> or place it at "/mingw/lib/gcc/mingw32/<version>/specs" to make GCC use it by default, where <version> refers to the GCC version installed.

Adding include directories to the search path

The *cpp: section should be modified. It contains the following by default:

*cpp:
%{posix:-D_POSIX_SOURCE} %{mthreads:-D_MT}

If "z:/libx/include" needs to be added to the GCC includes search path, it should be changed to the following

*cpp:
%{posix:-D_POSIX_SOURCE} %{mthreads:-D_MT} -I z:/libx/include

Adding lib directories to the search path

The *link_libgcc: section should be modified. It contains the following by default:

*link_libgcc:
%D

If "z:/libx/lib" needs to be added to the GCC library search path, it should be changed to the following

*link_libgcc:
%D -L z:/libx/lib