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

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