init commit

configure

@@ -0,0 +1,114 @@
+#!/bin/sh
+set -eu
+
+prefix=/usr/local
+cc=${CC:-cc}
+make_cmd=${MAKE:-make}
+install_cmd=${INSTALL:-install}
+ar=${AR:-ar}
+version=$(sed -n 's/^#define ENSIFER_VERSION "\([^"]*\)"/\1/p' inc/enfilade.h)
+if [ -z "$version" ]; then
+    echo "configure: ENSIFER_VERSION missing from inc/enfilade.h" >&2
+    exit 1
+fi
+
+usage() {
+    cat <<'EOF'
+Usage: ./configure [OPTIONS]
+
+Options:
+  --prefix=PATH   installation prefix (default: /usr/local)
+  --prefix PATH
+  -V, --version   print configure version
+  -h, --help      show this help
+
+Environment overrides: CC, CFLAGS, CPPFLAGS, LDFLAGS, AR, INSTALL, MAKE
+EOF
+}
+
+while [ "$#" -gt 0 ]; do
+    case $1 in
+        --prefix=*) prefix=${1#*=} ;;
+        --prefix)
+            shift
+            [ "$#" -gt 0 ] || { echo "configure: --prefix requires a path" >&2; exit 2; }
+            prefix=$1
+            ;;
+        -V|--version) printf 'configure version %s\n' "$version"; exit 0 ;;
+        -h|--help) usage; exit 0 ;;
+        *) echo "configure: unknown option: $1" >&2; usage >&2; exit 2 ;;
+    esac
+    shift
+done
+
+case $prefix in
+    "") echo "configure: installation prefix cannot be empty" >&2; exit 2 ;;
+    *' '*) echo "configure: paths containing spaces are not supported by make" >&2; exit 2 ;;
+esac
+
+command -v "$cc" >/dev/null 2>&1 || { echo "configure: C compiler not found: $cc" >&2; exit 1; }
+command -v "$make_cmd" >/dev/null 2>&1 || { echo "configure: make not found: $make_cmd" >&2; exit 1; }
+command -v "$install_cmd" >/dev/null 2>&1 || { echo "configure: install not found: $install_cmd" >&2; exit 1; }
+command -v "$ar" >/dev/null 2>&1 || { echo "configure: archiver not found: $ar" >&2; exit 1; }
+
+tmp=${TMPDIR:-/tmp}/ensifer-configure-$$
+mkdir "$tmp" || exit 1
+trap 'rm -rf "$tmp"' EXIT HUP INT TERM
+cat >"$tmp/conftest.c" <<'EOF'
+int ensifer_configure_probe(void) { return 0; }
+EOF
+if ! "$cc" ${CPPFLAGS:-} ${CFLAGS:-} -fPIC -shared -o "$tmp/conftest.so" "$tmp/conftest.c" ${LDFLAGS:-} >"$tmp/output" 2>&1; then
+    cat "$tmp/output" >&2
+    echo "configure: compiler does not support building shared libraries with -fPIC -shared" >&2
+    exit 1
+fi
+
+dl_flags=
+cat >"$tmp/dltest.c" <<'EOF'
+#include <dlfcn.h>
+int main(void) { return dlopen(0, RTLD_NOW) == 0; }
+EOF
+if "$cc" ${CPPFLAGS:-} ${CFLAGS:-} -o "$tmp/dltest" "$tmp/dltest.c" -ldl ${LDFLAGS:-} >/dev/null 2>&1; then
+    dl_flags='-DWITH_DL'
+    dl_libs=-ldl
+else
+    dl_libs=
+fi
+
+{
+    echo "# Generated by ./configure; edit configure options instead."
+    printf 'VERSION := %s\n' "$version"
+    printf 'CC := %s\n' "$cc"
+    printf 'AR := %s\n' "$ar"
+    printf 'INSTALL := %s\n' "$install_cmd"
+    printf 'PREFIX := %s\n' "$prefix"
+    printf 'CFLAGS ?= %s\n' "${CFLAGS:--O2 -Wall -Wextra -std=c11}"
+    printf 'CPPFLAGS ?= %s\n' "${CPPFLAGS:-}"
+    printf 'LDFLAGS ?= %s\n' "${LDFLAGS:-}"
+    printf 'S7_CPPFLAGS := %s -DWITH_SYSTEM_EXTRAS=0\n' "$dl_flags"
+    printf 'S7_LIBS := %s\n' "$dl_libs"
+} > config.mk
+
+cat > config.h <<EOF
+#ifndef ENSIFER_CONFIG_H
+#define ENSIFER_CONFIG_H
+#define ENSIFER_VERSION "$version"
+#endif
+EOF
+
+{
+    echo "Ensifer configure"
+    echo "version: $version"
+    echo "prefix: $prefix"
+    echo "compiler: $cc"
+    echo "make: $make_cmd"
+    echo "install: $install_cmd"
+    echo "S7 dynamic loading: ${dl_flags:-disabled}"
+    echo "shared library support: yes (-fPIC -shared)"
+} > config.log
+
+trap - EXIT HUP INT TERM
+rm -rf "$tmp"
+echo "configure: ready to build Ensifer $version"
+echo "  prefix: $prefix"
+echo "  run: make"