configure

#!/bin/sh
# Hand-rolled configure — no autotools by design (see README).
#
# Recognized options:
#   --with-tcl=DIR   directory containing tclConfig.sh
#   --host=TRIPLE    cross prefix for cc/ar/ranlib (e.g. x86_64-w64-mingw32)
# Anything else (--disable-shared, --prefix, ...) is accepted and
# ignored: the static library is always built; the shared library only
# on native builds (SHARED in config.mk).
set -e

TCLDIR=
HOST=
for arg in "$@"; do
    case $arg in
	--with-tcl=*) TCLDIR=${arg#--with-tcl=} ;;
	--host=*) HOST=${arg#--host=} ;;
    esac
done

# An empty submodule fails loudly here; otherwise the compiler falls
# through -Ideps/secp256k1/include to the system headers, which may be
# a libsecp256k1 too old for secp256k1_schnorrsig_sign32, and the
# shared-lib link would not even notice the missing symbol.
if [ ! -f "$(dirname "$0")/deps/secp256k1/include/secp256k1.h" ]; then
    echo "configure: deps/secp256k1 is empty (libsecp256k1 submodule);" >&2
    echo "           run: git submodule update --init" >&2
    exit 1
fi

if [ -z "$TCLDIR" ]; then
    for sh in tclsh9.0 tclsh8.6 tclsh; do
	guess=$(echo 'puts [::tcl::pkgconfig get libdir,install]' \
	    | $sh 2>/dev/null || true)
	[ -n "$guess" ] && break
    done
    for d in "$guess" /usr/local/lib /usr/lib64 /usr/lib \
	     /usr/lib/tcl9.0 /usr/lib/tcl8.6; do
	if [ -n "$d" ] && [ -f "$d/tclConfig.sh" ]; then
	    TCLDIR=$d
	    break
	fi
    done
fi
if [ -z "$TCLDIR" ] || [ ! -f "$TCLDIR/tclConfig.sh" ]; then
    echo "configure: tclConfig.sh not found; pass --with-tcl=DIR" >&2
    exit 1
fi
. "$TCLDIR/tclConfig.sh"

if [ -n "$HOST" ]; then
    CC=${CC:-$HOST-gcc}
    AR=${AR:-$HOST-ar}
    RANLIB=${RANLIB:-$HOST-ranlib}
else
    CC=${CC:-cc}
    AR=${AR:-ar}
    RANLIB=${RANLIB:-ranlib}
fi

EXTRA_DEFS=
EXTRA_SHLIBS=
SHARED=libnostr.so
TCLSH=
case $HOST in
    *mingw*)
	# static-consumer macro is mandatory on Windows since
	# libsecp256k1 0.4.0; no shared lib on cross builds
	EXTRA_DEFS=-DSECP256K1_STATIC
	SHARED=
	;;
    "")
	TCLSH="$TCL_EXEC_PREFIX/bin/tclsh$TCL_VERSION"
	;;
esac

mkdir -p build/s build/p
here=$(dirname "$0")
cp "$here/Makefile.in" Makefile
cat > config.mk <<EOF
# generated by configure — do not edit
CC = $CC
AR = $AR
RANLIB = $RANLIB
TCL_INCLUDE_SPEC = $TCL_INCLUDE_SPEC
TCL_STUB_LIB_SPEC = $TCL_STUB_LIB_SPEC
EXTRA_DEFS = $EXTRA_DEFS
SHARED = $SHARED
TCLSH = $TCLSH
EOF
echo "configure: wrote config.mk (CC=$CC, tcl=$TCLDIR)"