1 files changed, 154 insertions, 0 deletions
diff --git a/configure b/configure
new file mode 100755
index 0000000..a2dfa88
--- /dev/null
+++ b/configure
@@ -0,0 +1,154 @@
+#!/bin/bash
+# mg2d configure script
+# partially inspired by/based on the FFmpeg configure script
+
+die() {
+    echo "$@" >&2
+    exit 1
+}
+
+bootstrap() {
+    local source_dir
+
+    [ -e configure ] && die "Cannot build from the source dir, create a separate build directory"
+
+    source_dir=$(realpath $(dirname "$0"))
+    [ -d "$source_dir" ] || die "Cannot locate source directory"
+
+    [ -h src ] || ln -s "$source_dir" src
+
+    [ -h Makefile ] || ln -s "$source_dir/Makefile"
+
+    echo $source_dir
+}
+
+toupper() {
+    echo "$@" | tr abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ
+}
+
+is_in() {
+    value=$1
+    shift
+    for var in $*; do
+        [ $var = $value ] && return 0
+    done
+    return 1
+}
+
+probe_arch() {
+    arch=$(cc -dumpmachine | sed 's/-.*//')
+}
+
+check_mpi() {
+    pkg-config --exists mpi || return 1
+    mpi_cflags=$(pkg-config --cflags mpi)
+    mpi_libs=$(pkg-config --libs mpi)
+}
+
+check_nasm() {
+    if ! command -v nasm &> /dev/null; then
+        echo "nasm not found, assembly code will not be built"
+        return 1
+    fi
+}
+
+check_component() {
+    name=$1
+    shift
+    eval "check_$name" $@ && eval "have_$name=yes"
+}
+
+source_dir=$(bootstrap)
+
+
+CMDLINE_SET="
+    cc
+"
+
+cc=cc
+
+for arg; do
+    name="${arg%%=*}"
+    name="${name#--}"
+    name=$(echo "$name" | sed 's/-/_/g')
+
+    val="${arg#*=}"
+
+	if is_in $name $CMDLINE_SET; then
+        eval $name='$val'
+        continue
+	fi
+
+    die "Unknown commandline argument: $name $val"
+done
+
+probe_arch
+
+COMPONENTS_REQUIRED="
+    mpi
+"
+
+COMPONENTS_OPTIONAL="
+    nasm
+"
+
+COMPONENTS="
+    $COMPONENTS_REQUIRED
+    $COMPONENTS_OPTIONAL
+"
+
+for c in $COMPONENTS_REQUIRED; do
+    check_component $c || die "Required component $c not found"
+done
+
+for c in $COMPONENTS_OPTIONAL; do
+    check_component $c
+done
+
+cat > config.mak <<EOF
+SOURCE_DIR = $source_dir
+CC = $cc
+CFLAGS_DEP = $mpi_cflags
+LDFLAGS_DEP = $mpi_libs
+EOF
+
+cat > config.h <<EOF
+#ifndef MG2D_CONFIG_H
+#define MG2D_CONFIG_H
+
+EOF
+
+cat > config.asm << EOF
+EOF
+
+case "$arch" in
+    x86_64)
+        echo "ARCH_X86_64 = 1" >> config.mak
+        echo "#define ARCH_X86_64 1" >> config.h
+        echo "%define ARCH_X86_64 1" >> config.asm
+        ;;
+    *)
+        echo "ARCH_X86_64 = 0" >> config.mak
+        echo "#define ARCH_X86_64 0" >> config.h
+        echo "%define ARCH_X86_64 0" >> config.asm
+        ;;
+esac
+
+for c in $COMPONENTS; do
+    C=$(toupper $c)
+    have_ref=have_$c
+
+    if [ -n "${!have_ref}" ]; then
+        val_mak=yes
+        val_c=1
+    else
+        val_mak=no
+        val_c=0
+    fi
+
+    echo "HAVE_$C = $val_mak" >> config.mak
+    echo "#define HAVE_$C $val_c" >> config.h
+
+done
+
+echo "#endif // MG2D_CONFIG_H" >> config.h