configure: check for RTLD_DEEPBIND, rename

configure.ac

@@ -59,11 +59,17 @@ AS_CASE($ax_cv_cxx_compiler_vendor,
 AX_CXX_COMPILE_STDCXX([11], [noext], [mandatory])
 
 X_AC_ENABLE_SANITIZER
-if test "x$san_enabled" != "xno" ; then
-  AC_DEFINE([DEEPBIND], [0],
+AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,[
+  #include <dlfcn.h>
+  #if !(defined(RTLD_DEEPBIND))
+  #error nope
+  #endif
+])], [has_deepbind=yes], [has_deepbind=no])
+if test "x$san_enabled" != "xno" || test "x$has_deepbind" = "xno" ; then
+  AC_DEFINE([FLUX_DEEPBIND], [0],
             [deepbind is unsupported with asan, musl and so-forth])
 else
-  AC_DEFINE([DEEPBIND], [RTLD_DEEPBIND],
+  AC_DEFINE([FLUX_DEEPBIND], [RTLD_DEEPBIND],
             [deepbind is unsupported with asan, musl and so-forth])
 fi
 

src/broker/module.c

@@ -531,7 +531,7 @@ module_t *module_add (modhash_t *mh, const char *path)
     int rc;
 
     dlerror ();
-    if (!(dso = dlopen (path, RTLD_NOW | RTLD_LOCAL | DEEPBIND))) {
+    if (!(dso = dlopen (path, RTLD_NOW | RTLD_LOCAL | FLUX_DEEPBIND))) {
         log_msg ("%s", dlerror ());
         errno = ENOENT;
         return NULL;

src/common/libflux/handle.c

@@ -230,7 +230,7 @@ static connector_init_f *find_connector (const char *scheme, void **dsop)
     }
     if (!(path = find_file (name, searchpath)))
         goto done;
-    if (!(dso = dlopen (path, RTLD_LAZY | RTLD_LOCAL | DEEPBIND))) {
+    if (!(dso = dlopen (path, RTLD_LAZY | RTLD_LOCAL | FLUX_DEEPBIND))) {
         errno = EINVAL;
         goto done;
     }

src/common/libflux/module.c

@@ -263,7 +263,7 @@ char *flux_modname(const char *path)
     char *name = NULL;
 
     dlerror ();
-    if ((dso = dlopen (path, RTLD_LAZY | RTLD_LOCAL | DEEPBIND))) {
+    if ((dso = dlopen (path, RTLD_LAZY | RTLD_LOCAL | FLUX_DEEPBIND))) {
         int errnum = EINVAL;
         if ((np = dlsym (dso, "mod_name")) && *np)
             if (!(name = strdup (*np)))