dlfcn: Move dlerror into libc

The symbol was moved using scripts/move-symbol-to-libc.py.

There is a minor functionality enhancement: dlerror now sets
errno if it was set as part of the exception.  (This is the result
of using %m in asprintf, to avoid the strerror PLT call.) The
previous errno value upon function return was unpredictable.
Documenting this as a feature is premature; we need to make sure
that the error codes are meaningful when they are set by the dynamic
loader.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/dlfcn/Versions b/dlfcn/Versions
index f07cb929aa..76049e1c6a 100644
--- a/dlfcn/Versions
+++ b/dlfcn/Versions
@@ -1,11 +1,22 @@
 libc {
+  GLIBC_2.0 {
+    dlerror;
+  }
+  GLIBC_2.34 {
+    dlerror;
+  }
   GLIBC_PRIVATE {
     __libc_dlerror_result;
+    _dlerror_run;
+    _dlfcn_hook;
   }
 }
 libdl {
   GLIBC_2.0 {
-    dladdr; dlclose; dlerror; dlopen; dlsym;
+    dladdr;
+    dlclose;
+    dlopen;
+    dlsym;
   }
   GLIBC_2.1 {
     dlopen; dlvsym;
@@ -16,7 +27,4 @@ libdl {
   GLIBC_2.3.4 {
     dlmopen;
   }
-  GLIBC_PRIVATE {
-    _dlfcn_hook;
-  }
 }