Scan C/H source files for #if/#ifdef/#elif symbols, ignore some based on EFL conventions and the rest try to provide the cmake function to check for them

efl-c-scan-ifdefs.sh

#!/bin/sh

find $1 -type 'f' \( -name '*.c' -o -name '*.h' -o -name '*.x' \) |
    xargs grep --no-filename '^ *# *\(if\|elif\)' |
    sed 's/^ *# *\(if\|ifdef\|ifndef\|elif\)//g' |
    sed 's/\(defined\|[()!&|><=]\|^DBG\|^CRI\|^WRN\|^INF\|^ERR\|^NDEBUG\|^EAPI\|__cplusplus\|__APPLE__\|__MACH__\|_MSC_VER\|_WIN32\|__GNUC__\|\(INT\|UINT\)\(8\|16\|32\|64\)_\(MAX\|MIN\)\|HAVE_\(EXOTIC\|ESCAPE\|EVIL\)\)//g' |
    tr ' ' '\n' | sort -u | while read s; do
    if [ -z "$s" ]; then
        continue
    elif [ ${s#HAVE_} != $s ]; then
        r=${s#HAVE_}
        if [ ${r%_H} != $r ]; then
            h=${r%_H}
            h=${h,,}
            h=${h/_/\/}
            echo "$s  - HEADER_CHECK($h.h)"
        else
            r=${r,,}
            OIFS="$IFS"
            IFS=$'\n'
            found=0
            for f in `apropos -e -s 2,3 $r 2>/dev/null | sed 's/^\([^ ]\+\) (\([^ ]\+\)).*$/man \2 \1/g'`; do
                IFS="$OIFS"
                if [ `echo $f | cut -d' ' -f 3` == $r ]; then
                    export MANWIDTH=4096
                    incs=`$f | grep '#include' | sed 's/^.*#include \+<\([^>]\+\)>.*$/\1/g' | tr '\n' ' '`
                    if [ -n "$incs" ]; then
                        incs=" INCLUDE_FILES $incs"
                    fi

                    libs=`$f | grep -e ' -l' | sed 's/^.*\( -l[A-Za-z0-9_, ]\+\).*$/\1/g' | sed 's/\( -l\|,\)//g' | tr '\n' ' '`
                    if [ -n "$libs" ]; then
                        libs=" LIBRARIES $libs"
                    fi
                    echo "$s - FUNC_CHECK($r$incs$libs) # see $f"
                    found=1
                fi
            done
            IFS="$OIFS"
            if [ $found = 0 ]; then
                echo "$s"
            fi
        fi
    else
        echo "$s"
    fi
done