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
CC 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=
or place it at "/mingw/lib/gcc/mingw32//specs" to make GCC use it by default, where refers to the GCC version installed.
Adding include directories to the search path
he *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
he *link_libgcc: section should be modified. It contains the following by default:
*link_libgcc:
%D
f "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
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