configure

#!/bin/sh

#
# configure script for libfile
#

for arg in "$@"; do
    case "$arg" in
        ARCH=*)
            ARCH="${arg#ARCH=}"
            ;;
    esac
done

# Determine CONFIGARCH from ARCH
if [ -n "$ARCH" ]; then
    case "$ARCH" in
        i386|i686|x86|x86_32|x32)
            CONFIGARCH="32"
            ;;
        x86_64|amd64|x64)
            CONFIGARCH="64"
            ;;
        *)
            echo "invalid ARCH value, defaulting to CPU arch"
            ;;
    esac
fi

# Fallback to uname if CONFIGARCH still unset
if [ -z "$CONFIGARCH" ]; then
    if command -v uname >/dev/null 2>&1; then
        UNAME_ARCH=$(uname -m)
        case "$UNAME_ARCH" in
            x86_64) CONFIGARCH="64" ;;
            i386|i686) CONFIGARCH="32" ;;
            *) CONFIGARCH="32" ;;
        esac
    else
        echo "uname not found to check for architecture, aborting..."
        exit 1
    fi
fi

# Tool check
check_tool() {
    TOOL=$1
    echo -n "checking for $TOOL... "
    if command -v "$TOOL" >/dev/null 2>&1; then
        echo "yes"
    else
        echo "no"
        echo "$TOOL not found, aborting..."
        exit 1
    fi
}

# Header check
check_header() {
    HEADER=$1
    echo "#include <$HEADER>" > test.c
    echo "int main() { return 0; }" >> test.c

    echo -n "checking for $HEADER... "
    if cc -o test test.c 2>/dev/null; then
        echo "yes"
    else
        echo "no"
        echo "$HEADER not found, aborting..."
        rm -f test.c test
        exit 1
    fi
    rm -f test.c test
}

# Run checks
check_tool gcc
check_tool make
check_tool strip
check_header fcntl.h
check_header unistd.h
check_header stdint.h
check_header string.h

# Emit config.mak
echo "configure: creating config.mak..."
echo "CC = gcc" > config.mak
echo -n "CFLAGS = -Wall -O2 -fPIC -Iinclude" >> config.mak
if [ "$CONFIGARCH" = "32" ]; then
    echo " -m32" >> config.mak
    echo "LDFLAGS = -m32" >> config.mak
else
    echo " -m64" >> config.mak
    echo "LDFLAGS = -m64" >> config.mak
fi
echo "CONFIGARCH = $CONFIGARCH" >> config.mak

echo "Done."