The new module configuration interface.

Configuration and building example:

  ./configure
  ./configure python
  ./configure php
  ./configure go
  make all

or

  ./configure
  make nginext
  ./configure python
  make python
  ./configure php
  make php
  ./configure go
  make go

Modules configuration options and building examples:

  ./configure python --module=python2 --config=python2.7-config
  make python2

  ./configure php --module=php7 --config=php7.0-config
                  --lib-path=/usr/local/php7.0
  make php7

  ./configure go --go=go1.6 --go-path=${HOME}/go1.6
  make go1.6

11 files changed, 490 insertions, 66 deletions

diff --git a/auto/make b/auto/make
index 9739ee4b..f0733f3f 100644
--- a/auto/make
+++ b/auto/make
@@ -20,6 +20,11 @@ NXT_EXEC_LINK =		$NXT_EXEC_LINK $NXT_LD_OPT
 NXT_SHARED_LOCAL_LINK =	$NXT_SHARED_LOCAL_LINK $NXT_LD_OPT
 NXT_MODULE_LINK =	$NXT_MODULE_LINK $NXT_LD_OPT
 
+.PHONY:			$NXT_BIN
+$NXT_BIN:		$NXT_BUILD_DIR/$NXT_BIN
+
+all:			$NXT_BIN
+
 END
 
 
@@ -169,24 +174,19 @@ $echo >> $NXT_MAKEFILE
 
 # Object files list.
 
-nxt_modules_obj=`$echo $NXT_MODULES_SRC | sed -e "s/\.c$/\.o/"`
-
 $echo "NXT_OBJS = \\" >> $NXT_MAKEFILE
 
-for nxt_src in $NXT_MAKE_SRCS $NXT_MODULES_SRCS
+for nxt_src in $NXT_MAKE_SRCS
 do
     nxt_obj=`$echo $nxt_src | sed -e "s/\.c$/\.o/"`
     $echo "	$NXT_BUILD_DIR/$nxt_obj \\" >> $NXT_MAKEFILE
 done
 
-$echo "	$nxt_modules_obj" >> $NXT_MAKEFILE
 $echo >> $NXT_MAKEFILE
 
 
 # nginext executable.
 
-NXT_BIN=nginext
-
 cat << END >> $NXT_MAKEFILE
 
 $NXT_BUILD_DIR/$NXT_BIN:	$NXT_BUILD_DIR/$NXT_LIB_STATIC \\
@@ -215,48 +215,17 @@ END
 done
 
 
-# nxt_modules.c.
-
-cat << END >> $NXT_MAKEFILE
-
-$nxt_modules_obj:	$NXT_MODULES_SRC \$(NXT_DEPS)
-	\$(CC) -c \$(CFLAGS) \$(NXT_INCS) \\
-	 	$NXT_LIB_AUX_CFLAGS \\
-		-o $nxt_modules_obj \\
-		$NXT_MODULES_SRC
-END
-
-
-if [ $NXT_PYTHON_MODULE != NO ]; then
-    . auto/modules/python/make
-fi
-
-if [ $NXT_PHP_MODULE != NO ]; then
-    . auto/modules/php/make
-fi
-
-if [ $NXT_GO_MODULE != NO ]; then
-    . auto/modules/go/make
-fi
-
-
 # Makefile.
 # *.dSYM is MacOSX Clang debug information.
 
 cat << END > Makefile
 
-.PHONY: $NXT_BIN lib_test
-
-all: $NXT_BIN
-
 include $NXT_MAKEFILE
 
-
-lib_test: $NXT_BUILD_DIR/lib_unit_test $NXT_BUILD_DIR/utf8_file_name_test
+.PHONY:		lib_test
+lib_test:	$NXT_BUILD_DIR/lib_unit_test $NXT_BUILD_DIR/utf8_file_name_test
 
 clean:
-	rm -rf $NXT_BUILD_DIR *.dSYM Makefile
-
-$NXT_BIN: $NXT_BUILD_DIR/$NXT_BIN
+		rm -rf $NXT_BUILD_DIR *.dSYM Makefile
 
 END
diff --git a/auto/modules/conf b/auto/modules/conf
new file mode 100644
index 00000000..e7f21b9e
--- /dev/null
+++ b/auto/modules/conf
@@ -0,0 +1,37 @@
+
+# Copyright (C) Igor Sysoev
+# Copyright (C) NGINX, Inc.
+
+
+if [ ! -f $NXT_AUTOCONF_DATA ]; then
+   echo
+   echo Please run common $0 before configuring module \"$nxt_module\".
+   echo
+   exit 1
+fi
+
+. $NXT_AUTOCONF_DATA
+
+
+case "$nxt_module" in
+
+   python)
+       . auto/modules/python
+   ;;
+
+   php)
+       . auto/modules/php
+   ;;
+
+   go)
+       . auto/modules/go
+   ;;
+
+   *)
+       echo
+       echo $0: error: invalid module \"$nxt_module\".
+       echo
+       exit 1
+   ;;
+
+esac
diff --git a/auto/modules/go b/auto/modules/go
new file mode 100644
index 00000000..dbba443d
--- /dev/null
+++ b/auto/modules/go
@@ -0,0 +1,109 @@
+
+# Copyright (C) Max Romanov
+# Copyright (C) NGINX, Inc.
+
+
+shift
+
+NXT_GO=go
+
+for nxt_option; do
+
+    case "$nxt_option" in
+        -*=*) value=`$echo "$nxt_option" | sed -e 's/[-_a-zA-Z0-9]*=//'`     ;;
+           *) value="" ;;
+    esac
+
+    case "$nxt_option" in
+        --go=*)       NXT_GO="$value"                                        ;;
+        --go-path=*)  NXT_GO_PATH="$value"                                   ;;
+
+        --help)
+            cat << END
+
+    --go=NAME        set go executable
+    --go-path=PATH   set GOPATH variable to install package
+
+END
+            exit 0
+        ;;
+
+        *)
+            $echo
+            $echo $0: error: invalid Go option \"$nxt_option\"
+            $echo
+            exit 1
+        ;;
+
+    esac
+
+done
+
+
+$echo "configuring Go package"
+$echo "configuring Go package ..." >> $NXT_AUTOCONF_ERR
+
+$echo -n "checking for Go ..."
+$echo "checking for Go ..." >> $NXT_AUTOCONF_ERR
+
+nxt_go_test="GOPATH=`pwd` CGO_CPPFLAGS=-DNXT_CONFIGURE \
+    \"${NXT_GO}\" build -o build/nxt_go_gen.a --buildmode=c-archive nginext"
+
+
+if /bin/sh -c "$nxt_go_test" >> $NXT_AUTOCONF_ERR 2>&1; then
+    $echo " found"
+
+    NXT_GO_VERSION="`${NXT_GO} version`"
+    $echo " + ${NXT_GO_VERSION}"
+
+else
+    $echo "----------"    >> $NXT_AUTOCONF_ERR
+    $echo $nxt_go_test    >> $NXT_AUTOCONF_ERR
+    $echo "----------"    >> $NXT_AUTOCONF_ERR
+    $echo
+    $echo
+    $echo $0: error: no Go found.
+    $echo
+    exit 1;
+fi
+
+
+
+NXT_GO_PATH=${NXT_GO_PATH=`go env GOPATH`}
+NXT_GO_PATH=${NXT_GO_PATH:-`pwd`/${NXT_GO}}
+
+$echo " + Go package path: \"${NXT_GO_PATH}\""
+
+if grep ^$NXT_GO: $NXT_MAKEFILE 2>&1 > /dev/null; then
+    $echo
+    $echo $0: error: duplicate \"$NXT_GO\" package configured.
+    $echo
+    exit 1;
+fi
+
+cat << END >> $NXT_MAKEFILE
+
+.PHONY:		${NXT_GO}
+
+NXT_ROOT =	`pwd`
+
+GOPATH =	$NXT_GO_PATH
+GOOS =		`go env GOOS`
+GOARCH =	`go env GOARCH`
+
+${NXT_GO}:
+	install -d \$(GOPATH)/src/nginext
+	install -p ./src/nginext/*.c ./src/nginext/*.h \\
+		./src/nginext/*.go \$(GOPATH)/src/nginext/
+	CGO_CFLAGS="-I\$(NXT_ROOT)/build -I\$(NXT_ROOT)/src" \\
+		CGO_LDFLAGS="-L\$(NXT_ROOT)/build" \\
+		GOPATH=$NXT_GO_PATH \\
+		go install -v nginext
+
+${NXT_GO}-uninstall:
+	rm -rf \$(GOPATH)/src/nginext
+	rm -f \$(GOPATH)/pkg/\$(GOOS)_\$(GOARCH)/nginext.a
+
+END
+
+sed -i.bak -e "s/\(all:.*\)/\1 ${NXT_GO}/" $NXT_MAKEFILE
diff --git a/auto/modules/php b/auto/modules/php
new file mode 100644
index 00000000..c9fff12f
--- /dev/null
+++ b/auto/modules/php
@@ -0,0 +1,152 @@
+
+# Copyright (C) Max Romanov
+# Copyright (C) Igor Sysoev
+# Copyright (C) NGINX, Inc.
+
+
+shift
+
+for nxt_option; do
+
+    case "$nxt_option" in
+        -*=*) value=`$echo "$nxt_option" | sed -e 's/[-_a-zA-Z0-9]*=//'`     ;;
+           *) value="" ;;
+    esac
+
+    case "$nxt_option" in
+        --config=*)    NXT_PHP_CONFIG="$value"                               ;;
+        --module=*)    NXT_PHP_MODULE="$value"                               ;;
+        --lib-path=*)  NXT_PHP_LIB_PATH="$value"                             ;;
+
+        --help)
+            cat << END
+
+    --config=NAME     set php-config name
+    --module=NAME     set php module name
+    --lib-path=PATH   set path to libphp.so library
+
+END
+            exit 0
+        ;;
+
+        *)
+            $echo
+            $echo $0: error: invalid PHP option \"$nxt_option\"
+            $echo
+            exit 1
+        ;;
+
+    esac
+
+
+done
+
+
+NXT_PHP_CONFIG=${NXT_PHP_CONFIG=php-config}
+NXT_PHP=${NXT_PHP_CONFIG%-config*}
+NXT_PHP_MODULE=${NXT_PHP_MODULE=${NXT_PHP##*/}}
+NXT_PHP_LIB_PATH=${NXT_PHP_LIB_PATH=}
+
+
+$echo "configuring PHP module"
+$echo "configuring PHP module ..." >> $NXT_AUTOCONF_ERR
+
+$echo -n "checking for PHP ..."
+$echo "checking for PHP ..." >> $NXT_AUTOCONF_ERR
+
+NXT_PHP_LDFLAGS=
+
+if /bin/sh -c "${NXT_PHP_CONFIG} --version"  >> $NXT_AUTOCONF_ERR 2>&1; then
+
+    $echo " found"
+
+    NXT_PHP_VERSION="`${NXT_PHP_CONFIG} --version`"
+    $echo " + PHP version: ${NXT_PHP_VERSION}"
+    $echo " + PHP SAPI: [`${NXT_PHP_CONFIG} --php-sapis`]"
+
+    NXT_PHP_INCLUDE="`${NXT_PHP_CONFIG} --includes`"
+    NXT_PHP_LIB="-lphp${NXT_PHP_VERSION%%.*}"
+
+    if [ "$NXT_PHP_LIB_PATH" != "" ]; then
+        # "php-config --ldflags" does not contain path to libphp.
+        NXT_PHP_LDFLAGS="-L${NXT_PHP_LIB_PATH} -Wl,-rpath ${NXT_PHP_LIB_PATH}"
+    fi
+
+    nxt_feature="PHP embed SAPI"
+    nxt_feature_name=NXT_HAVE_PHP
+    nxt_feature_run=no
+    nxt_feature_incs="${NXT_PHP_INCLUDE}"
+    nxt_feature_libs="${NXT_PHP_LIB} ${NXT_PHP_LDFLAGS}"
+    nxt_feature_test="
+        #include <php.h>
+        #include <php_main.h>
+
+        int main() {
+            php_request_startup();
+            return 0;
+        }"
+
+    . auto/feature
+
+    if [ $nxt_found = no ]; then
+        $echo
+        $echo $0: error: no PHP embed SAPI found.
+        $echo
+        exit 1;
+    fi
+
+else
+    $echo
+    $echo $0: error: no PHP found.
+    $echo
+    exit 1;
+fi
+
+if grep ^$NXT_PHP_MODULE: $NXT_MAKEFILE 2>&1 > /dev/null; then
+    $echo
+    $echo $0: error: duplicate \"$NXT_PHP_MODULE\" module configured.
+    $echo
+    exit 1;
+fi
+
+$echo " + PHP module: nginext.${NXT_PHP_MODULE}"
+
+
+$echo >> $NXT_MAKEFILE
+
+NXT_PHP_MODULE_SRCS=" \
+    src/nxt_php_sapi.c \
+"
+
+# The php module object files.
+
+nxt_objs=
+
+for nxt_src in $NXT_PHP_MODULE_SRCS; do
+
+    nxt_obj=`$echo $nxt_src | sed -e "s/\.c$/-$NXT_PHP_MODULE.o/"`
+    nxt_objs="$nxt_objs $NXT_BUILD_DIR/$nxt_obj"
+
+    cat << END >> $NXT_MAKEFILE
+
+$NXT_BUILD_DIR/$nxt_obj:	$nxt_src
+	\$(CC) -c \$(CFLAGS) \$(NXT_INCS) $NXT_PHP_INCLUDE \\
+	-o $NXT_BUILD_DIR/$nxt_obj $nxt_src
+END
+
+done
+
+ 
+cat << END >> $NXT_MAKEFILE
+
+.PHONY:			${NXT_PHP_MODULE}
+
+${NXT_PHP_MODULE}:	$NXT_BUILD_DIR/nginext.${NXT_PHP_MODULE}
+
+$NXT_BUILD_DIR/nginext.${NXT_PHP_MODULE}:	$nxt_objs
+	$NXT_MODULE_LINK -o $NXT_BUILD_DIR/nginext.${NXT_PHP_MODULE} \\
+	$nxt_objs ${NXT_PHP_LIB} ${NXT_PHP_LDFLAGS}
+
+END
+
+sed -i.bak -e "s/\(all:.*\)/\1 ${NXT_PHP_MODULE}/" $NXT_MAKEFILE
diff --git a/auto/modules/python b/auto/modules/python
new file mode 100644
index 00000000..d34abca9
--- /dev/null
+++ b/auto/modules/python
@@ -0,0 +1,148 @@
+
+# Copyright (C) Valentin V. Bartenev
+# Copyright (C) Igor Sysoev
+# Copyright (C) NGINX, Inc.
+
+
+shift
+
+for nxt_option; do
+
+    case "$nxt_option" in
+        -*=*) value=`$echo "$nxt_option" | sed -e 's/[-_a-zA-Z0-9]*=//'`     ;;
+           *) value="" ;;
+    esac
+
+    case "$nxt_option" in
+
+        --config=*)  NXT_PYTHON_CONFIG="$value"                              ;;
+        --module=*)  NXT_PYTHON_MODULE="$value"                              ;;
+
+        --help)
+            cat << END
+
+    --config=NAME   set python-config name
+    --module=NAME   set python module name
+
+END
+            exit 0
+        ;;
+
+        *)
+            $echo
+            $echo $0: error: invalid Python option \"$nxt_option\"
+            $echo
+            exit 1
+        ;;
+    esac
+
+done
+
+
+NXT_PYTHON_CONFIG=${NXT_PYTHON_CONFIG=python-config}
+NXT_PYTHON=${NXT_PYTHON_CONFIG%-config*}
+NXT_PYTHON_MODULE=${NXT_PYTHON_MODULE=${NXT_PYTHON##*/}}
+
+
+$echo "configuring Python module"
+$echo "configuring Python module ..." >> $NXT_AUTOCONF_ERR
+
+nxt_found=no
+
+if /bin/sh -c "$NXT_PYTHON_CONFIG --prefix" >> $NXT_AUTOCONF_ERR 2>&1; then
+
+    NXT_PYTHON_INCLUDE=`${NXT_PYTHON_CONFIG} --includes`
+    NXT_PYTHON_LIBS=`${NXT_PYTHON_CONFIG} --ldflags`
+
+    nxt_feature="Python"
+    nxt_feature_name=NXT_HAVE_PYTHON
+    nxt_feature_run=no
+    nxt_feature_incs="${NXT_PYTHON_INCLUDE}"
+    nxt_feature_libs="${NXT_PYTHON_LIBS}"
+    nxt_feature_test="
+        #include <Python.h>
+
+        int main() {
+            Py_Initialize();
+            return 0;
+        }"
+
+    . auto/feature
+
+else
+    $echo "checking for Python ... not found"
+fi
+
+if [ $nxt_found = no ]; then
+    $echo
+    $echo $0: error: no Python found.
+    $echo
+    exit 1;
+fi
+
+
+nxt_feature="Python version"
+nxt_feature_name=NXT_PYTHON_VERSION
+nxt_feature_run=value
+nxt_feature_incs="${NXT_PYTHON_INCLUDE}"
+nxt_feature_libs="${NXT_PYTHON_LIBS}"
+nxt_feature_test="
+    #include <Python.h>
+    #include <stdio.h>
+
+    int main() {
+        printf("PY_VERSION");
+        return 0;
+    }"
+
+. auto/feature
+
+
+if grep ^$NXT_PYTHON_MODULE: $NXT_MAKEFILE 2>&1 > /dev/null; then
+    $echo
+    $echo $0: error: duplicate \"$NXT_PYTHON_MODULE\" module configured.
+    $echo
+    exit 1;
+fi
+
+$echo " + Python module: nginext.${NXT_PYTHON_MODULE}"
+
+
+$echo >> $NXT_MAKEFILE
+
+NXT_PYTHON_MODULE_SRCS=" \
+    src/nxt_python_wsgi.c \
+"
+
+# The python module object files.
+
+nxt_objs=
+
+for nxt_src in $NXT_PYTHON_MODULE_SRCS; do
+
+    nxt_obj=`$echo $nxt_src | sed -e "s/\.c$/-$NXT_PYTHON_MODULE.o/"`
+    nxt_objs="$nxt_objs $NXT_BUILD_DIR/$nxt_obj"
+
+    cat << END >> $NXT_MAKEFILE
+
+$NXT_BUILD_DIR/$nxt_obj:	$nxt_src
+	\$(CC) -c \$(CFLAGS) \$(NXT_INCS) $NXT_PYTHON_INCLUDE \\
+	-o $NXT_BUILD_DIR/$nxt_obj $nxt_src
+END
+
+done
+
+ 
+cat << END >> $NXT_MAKEFILE
+
+.PHONY:			${NXT_PYTHON_MODULE}
+
+${NXT_PYTHON_MODULE}:	$NXT_BUILD_DIR/nginext.${NXT_PYTHON_MODULE}
+
+$NXT_BUILD_DIR/nginext.${NXT_PYTHON_MODULE}:	$nxt_objs
+	$NXT_MODULE_LINK -o $NXT_BUILD_DIR/nginext.${NXT_PYTHON_MODULE} \\
+	$nxt_objs $NXT_PYTHON_LIBS
+
+END
+
+sed -i.bak -e "s/\(all:.*\)/\1 ${NXT_PYTHON_MODULE}/" $NXT_MAKEFILE
diff --git a/auto/options b/auto/options
index 594a5ab8..5e402524 100644
--- a/auto/options
+++ b/auto/options
@@ -41,16 +41,6 @@ NXT_TEST_BUILD_HPUX_SENDFILE=NO
 
 NXT_LIB_UNIT_TEST=NO
 
-NXT_PYTHON=python
-NXT_PYTHON_MODULE=NO
-
-NXT_PHP=php
-NXT_PHP_LDFLAGS=
-NXT_PHP_MODULE=NO
-
-NXT_GO=go
-NXT_GO_MODULE=NO
-
 for nxt_option
 do
     case "$nxt_option" in
@@ -96,16 +86,6 @@ do
 
         --with-lib-unit-tests)           NXT_LIB_UNIT_TEST=YES               ;;
 
-        --with-python=*)                 NXT_PYTHON="$value"                 ;;
-        --with-python_module)            NXT_PYTHON_MODULE=YES               ;;
-
-        --with-php=*)                    NXT_PHP="$value"                    ;;
-        --with-php-ldflags=*)            NXT_PHP_LDFLAGS="$value"            ;;
-        --with-php_module)               NXT_PHP_MODULE=YES                  ;;
-
-        --with-go=*)                     NXT_GO="$value"                     ;;
-        --with-go_module)                NXT_GO_MODULE=YES                   ;;
-
         *)
             $echo
             $echo "$0: error: invalid option \"$nxt_option\"".
diff --git a/auto/os/conf b/auto/os/conf
index 3db382c6..6d86a849 100644
--- a/auto/os/conf
+++ b/auto/os/conf
@@ -26,7 +26,6 @@ case "$NXT_SYSTEM" in
         NXT_SHARED_LOCAL_LINK="\$(CC) -shared \
                                -Wl,-soname,\\\$\$ORIGIN/libnxt.so"
         NXT_MODULE_LINK="\$(CC) -shared"
-        NXT_MODULE_LINK="\$(CC) -shared"
 
         # "-Wl,-E" exports symbols of executable file.
         NXT_EXEC_LINK="\$(CC) -Wl,-E"
@@ -104,8 +103,8 @@ case "$NXT_SYSTEM" in
         # MacOSX 10.6 (Snow Leopard) has deprecated ucontext(3).
         # MacOSX 10.7 (Lion) has deprecated system OpenSSL.
         # MAC_OS_X_VERSION_MIN_REQUIRED macro does not help.
-        # The minimum version allowed for i386 is 10.4 (Tiger).
-        NXT_CFLAGS="$NXT_CFLAGS -mmacosx-version-min=10.4"
+        # "-rpath" is supported since MacOSX 10.5 (Leopard).
+        NXT_CFLAGS="$NXT_CFLAGS -mmacosx-version-min=10.5"
 
         NXT_STATIC_LINK="ar -r -c"
         NXT_SHARED_LINK="\$(CC) -dynamiclib"
@@ -113,7 +112,8 @@ case "$NXT_SYSTEM" in
                                -install_name @executable_path/libnxt.dylib"
 
         # Prior to MacOSX 10.5 (Leopard) only bundles could be unloaded.
-        NXT_MODULE_LINK="\$(CC) -bundle -undefined dynamic_lookup"
+        # NXT_MODULE_LINK="\$(CC) -bundle -undefined dynamic_lookup"
+        NXT_MODULE_LINK="\$(CC) -dynamiclib -undefined dynamic_lookup"
 
         NXT_EXEC_LINK="\$(CC)"
         NXT_SHARED_LOCAL_EXEC_LINK=
diff --git a/auto/os/test b/auto/os/test
index 36ce50ae..0332fcfa 100644
--- a/auto/os/test
+++ b/auto/os/test
@@ -41,7 +41,7 @@ case "$NXT_SYSTEM" in
         echo=echo
         CC=${CC:-cc}
 
-        NXT_TEST_CFLAGS="$NXT_TEST_CFLAGS -mmacosx-version-min=10.4"
+        NXT_TEST_CFLAGS="$NXT_TEST_CFLAGS -mmacosx-version-min=10.5"
         ;;
 
     AIX)
diff --git a/auto/save b/auto/save
new file mode 100644
index 00000000..d295ad8b
--- /dev/null
+++ b/auto/save
@@ -0,0 +1,24 @@
+
+# Copyright (C) Igor Sysoev
+# Copyright (C) NGINX, Inc.
+
+
+cat << END > $NXT_AUTOCONF_DATA
+
+CC='$CC'
+CFLAGS='$CFLAGS'
+
+NXT_CFLAGS='$NXT_CFLAGS'
+NXT_CC_OPT='$NXT_CC_OPT'
+NXT_LD_OPT='$NXT_LD_OPT'
+NXT_MODULE_LINK='$NXT_MODULE_LINK'
+
+NXT_TEST_CFLAGS='$NXT_TEST_CFLAGS'
+NXT_TEST_LIBS='$NXT_TEST_LIBS'
+
+echo=$NXT_BUILD_DIR/echo
+
+NXT_LIB_AUX_CFLAGS=
+NXT_LIB_AUX_LIBS=
+
+END
diff --git a/auto/sources b/auto/sources
index f4447c2a..6ef8b5fe 100644
--- a/auto/sources
+++ b/auto/sources
@@ -147,6 +147,7 @@ NXT_LIB_SRCS=" \
     src/nxt_controller.c \
     src/nxt_router.c \
     src/nxt_application.c \
+    src/nxt_go.c \
     src/nxt_port_hash.c \
 "
 
diff --git a/auto/unix b/auto/unix
index 59c7f68a..acacce0d 100644
--- a/auto/unix
+++ b/auto/unix
@@ -73,6 +73,8 @@ fi
 
 # FreeBSD dlopen() is in libc.
 # MacOSX libdl.dylib is a symlink to libSystem.dylib.
+# GCC5 AddressSanitizer intercepts dlopen() and dlclose() but not dlsym()
+# so all dynamic linker functions should be tested.
 
 NXT_LIBDL=
 
@@ -85,7 +87,9 @@ nxt_feature_test="#include <stdlib.h>
                   #include <dlfcn.h>
 
                   int main() {
-                      dlopen(NULL, 0);
+                      void *h = dlopen(NULL, RTLD_NOW | RTLD_GLOBAL);
+                      dlsym(h, \"\");
+                      dlclose(h);
                       return 0;
                   }"
 . auto/feature