How to add a default include path for GCC in Linux?
I'd like gcc to include files from $HOME/include in addition to the usual include directories, but there doesn't seem to be an analogue to $LD_LIBRARY_PATH.
I know I can just add the include directory at command line when compiling (or in the makefile), but I'd really like a universal approach here, as in the library case.
Try setting C_INCLUDE_PATH (for C header files) or CPLUS_INCLUDE_PATH (for C++ header files).
As Ciro mentioned, CPATH will set the path for both C and C++ (and any other language).
More details in GCC's documentation.
Create an alias for gcc with your favorite includes.
alias mygcc='gcc -I /whatever/'
just a note: CPLUS_INCLUDE_PATH and C_INCLUDE_PATH are not the equivalent of LD_LIBRARY_PATH. LD_LIBRARY_PATH serves the ld (the dynamic linker at runtime) whereas the equivalent of the former two that serves your C/C++ compiler with the location of libraries is LIBRARY_PATH.
A gcc spec file can do the job, however all users on the machine will be affected.
See HOWTO Use the GCC specs file
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-I-l<libnam>to link Just note that creating an alias is a very poor solution, really you would build a list of your 'favorite includes' and add them in your makefile.