Also the $ccflags is needed for the C compiler check.

[metaconfig.git] / U / perl / Checkcc.U

?RCS:
?RCS: $Id$
?RCS:
?RCS: Copyright (c) 2000, Jarkko Hietaniemi
?RCS: 
?X: 
?X: This unit produces a bit of shell code that must be dotted in order
?X: to make quick check on whether the current C compiler is working.
?X:	
?MAKE:Checkcc ccname ccversion: rm cat test Myread startsh
?MAKE:	-pick add $@ %<
?S:ccname:
?S:	This can set either by hints files or by Configure.  If using
?S:	gcc, this is gcc, and if not, usually equal to cc, unimpressive, no?
?S:	Some platforms, however, make good use of this by storing the
?S:	flavor of the C compiler being used here.  For example if using
?S:	the Sun WorkShop suite, ccname will be 'workshop'.
?S:.
?S:ccversion:
?S:	This can set either by hints files or by Configure.  If using
?S:	a (non-gcc) vendor cc, this variable may contain a version for
?S:	the compiler.
?S:.
?T: trygcc despair
?F:./checkcc
?INIT:ccname=''
?INIT:ccversion=''
?LINT:extern cc
?LINT:change cc
?LINT:extern ccflags
?LINT:change ccflags
cat <<EOS >checkcc
$startsh
EOS
cat <<'EOSC' >>checkcc
case "$cc" in
'') ;;
*)  $rm -f try try.*
    $cat >try.c <<EOM
int main(int argc, char *argv[]) {
  return 0;
}
EOM
    if $cc $cflags -o try try.c; then
       :
    else
        echo "Uh-oh, the C compiler '$cc' doesn't seem to be working." >&4
        despair=yes
        trygcc=yes
        case "$cc" in
        *gcc*) trygcc=no ;;
        esac
        case "`$cc -v -c try.c 2>&1`" in
        *gcc*) trygcc=no ;;
        esac
        if $test X"$trygcc" = Xyes; then
            if gcc -o try -c try.c; then
                echo " "
                echo "You seem to have a working gcc, though." >&4
                rp="Would you like to use it?"
                dflt=y
                if $test -f myread; then
                    . ./myread
                else
                    if $test -f UU/myread; then
                        . ./UU/myread
                    else
                        echo "Cannot find myread, sorry.  Aborting." >&2
                        exit 1
                    fi
                fi  
                case "$ans" in
                [yY]*) cc=gcc; ccname=gcc; ccflags=''; despair=no ;;
                esac
            fi
        fi
        if $test X"$despair" = Xyes; then
	    $cat >&4 <<EOM
You need to find a working C compiler.
Either (purchase and) install the C compiler supplied by your OS vendor,
or for a free C compiler try http://gcc.gnu.org/
I cannot continue any further, aborting.
EOM
            exit 1
        fi
    fi
    $rm -f try try.*
    ;;
esac
EOSC