(gccint.info.gz) Header Dirs

 
 21 Standard Header File Directories
 ***********************************
 
 `GCC_INCLUDE_DIR' means the same thing for native and cross.  It is
 where GCC stores its private include files, and also where GCC stores
 the fixed include files.  A cross compiled GCC runs `fixincludes' on
 the header files in `$(tooldir)/include'.  (If the cross compilation
 header files need to be fixed, they must be installed before GCC is
 built.  If the cross compilation header files are already suitable for
 GCC, nothing special need be done).
 
  `GPLUSPLUS_INCLUDE_DIR' means the same thing for native and cross.  It
 is where `g++' looks first for header files.  The C++ library installs
 only target independent header files in that directory.
 
  `LOCAL_INCLUDE_DIR' is used only by native compilers.  GCC doesn't
 install anything there.  It is normally `/usr/local/include'.  This is
 where local additions to a packaged system should place header files.
 
  `CROSS_INCLUDE_DIR' is used only by cross compilers.  GCC doesn't
 install anything there.
 
  `TOOL_INCLUDE_DIR' is used for both native and cross compilers.  It is
 the place for other packages to install header files that GCC will use.
 For a cross-compiler, this is the equivalent of `/usr/include'.  When
 you build a cross-compiler, `fixincludes' processes any header files in
 this directory.

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