#!/bin/sh

try_cc() {
    echo1 "Checking whether the C compiler ($CC $CPPFLAGS $CFLAGS) works..."
    if conftest; then
	echo2 yes
	return 0
    else
	echo2 no
	return 1
    fi
}

# Try to sense what flags the compiler will accept
all_tries() {
    try_cc && return 0

    CFLAGS="-O"
    try_cc && return 0

    CFLAGS=
    try_cc && return 0

    CPPFLAGS=
    try_cc && return 0

    return 1
}

cat > conftest.c << EOF
#include <stdlib.h>
int main() {
    return 0;
}
EOF

if all_tries; then true; else
    cat << EOF
configure: Aborting. Your C compiler ($CC $CPPFLAGS $CFLAGS) does not seem to work.
See config.log for details.
EOF
    rm -f conftest conftest.c
    exit 1
fi