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# gcc(1) completion                                        -*- shell-script -*-
#
# The only unusual feature is that we don't parse "gcc --help -v" output
# directly, because that would include the options of all the other backend
# tools (linker, assembler, preprocessor, etc) without any indication that
# you cannot feed such options to the gcc driver directly.  (For example, the
# linker takes a -z option, but you must type -Wl,-z for gcc.)  Instead, we
# ask the driver ("g++") for the name of the compiler ("cc1"), and parse the
# --help output of the compiler.

_gcc()
{
    local cur prev words cword
    _init_completion || return

_expand || return

local cc backend

case $1 in
        gcj)
            backend=jc1
            ;;
        gpc)
            backend=gpc1
            ;;
        *77)
            backend=f771
            ;;
        *95)
            backend=f951
            ;;
        *)
            backend=cc1 # (near-)universal backend
            ;;
    esac

if [[ "$cur" == -* ]]; then
        cc=$( $1 -print-prog-name=$backend 2>/dev/null )
        [[ $cc ]] || return
        # sink stderr:
        # for C/C++/ObjectiveC it's useless
        # for FORTRAN/Java it's an error
        COMPREPLY=( $( compgen -W "$( $cc --help 2>/dev/null | tr '\t' ' ' |\
            command sed -e '/^  *-/!d' -e 's/ *-$[^][ <>]*$.*/-\1/' )" -- "$cur" ) )
        [[ $COMPREPLY == *= ]] && compopt -o nospace
    else
        _filedir
    fi
} &&
complete -F _gcc gcc g++ gfortran g77 g95 gcj gpc &&
{
    cc  --version 2>/dev/null | command grep -q GCC || \
        [[ $( _realcommand cc ) == *gcc* ]] && \
        complete -F _gcc cc  || complete -F _minimal cc
    c++ --version 2>/dev/null | command grep -q GCC || \
        [[ $( _realcommand c++ ) == *g++* ]] && \
        complete -F _gcc c++ || complete -F _minimal c++
    f77 --version 2>/dev/null | command grep -q GCC || \
        [[ $( _realcommand f77 ) == *gfortran* ]] && \
        complete -F _gcc f77 || complete -F _minimal f77
    f95 --version 2>/dev/null | command grep -q GCC || \
        [[ $( _realcommand f95 ) == *gfortran* ]] && \
        complete -F _gcc f95 || complete -F _minimal f95
}

# ex: filetype=sh

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