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Standard
header file directories
The following directories are standards for GNU CC.
-
GCC_INCLUDE_DIR
means the same thing for native and cross. It is where GNU CC stores its
private include files, and also where GNU CC stores the fixed include
files. A cross compiled GNU CC runs fixincludes
on the header files in $(tooldir)/include.
(If the cross compilation header files need to be fixed, they must be installed
before GNU CC is built. If the cross compilation header files are already
suitable for ANSI C and GNU CC, nothing special need be done).
-
GPLUS_INCLUDE_DIR
means the same thing for native and cross. It is where g++
looks first for header files. libg++
installs only target independent header files in that directory.
-
LOCAL_INCLUDE_DIR
is used only for a native compiler. It is normally /usr/local/include.
GNU CC searches this directory so that users can install header files in
/usr/local/include.
-
CROSS_INCLUDE_DIR
is used only for a cross compiler. GNU CC doesnt 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 GNU CC 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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