dlfcn: Move dlsym into libc

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

In elf/Makefile, remove the $(libdl) dependency from testobj1.so
because it the unused libdl DSO now causes elf/tst-unused-deps to
fail.

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

70 files changed, 108 insertions, 60 deletions

diff --git a/dlfcn/Makefile b/dlfcn/Makefile
index f0793468c7..b0f2e8a986 100644
--- a/dlfcn/Makefile
+++ b/dlfcn/Makefile
@@ -21,7 +21,7 @@ include ../Makeconfig
 
 headers		:= bits/dlfcn.h dlfcn.h
 extra-libs	:= libdl
-libdl-routines	:= dlopen dlsym dlvsym dladdr1 dlinfo \
+libdl-routines	:= dlopen dlvsym dladdr1 dlinfo \
 		   dlmopen dlfcn
 routines	:= $(patsubst %,s%,$(filter-out dlfcn,$(libdl-routines)))
 elide-routines.os := $(routines)
@@ -29,6 +29,7 @@ routines += \
   dladdr \
   dlclose \
   dlerror \
+  dlsym \
   libc_dlerror_result \
 
 extra-libs-others := libdl
diff --git a/dlfcn/Versions b/dlfcn/Versions
index f801fffb87..7d6b51a4e3 100644
--- a/dlfcn/Versions
+++ b/dlfcn/Versions
@@ -3,11 +3,13 @@ libc {
     dladdr;
     dlclose;
     dlerror;
+    dlsym;
   }
   GLIBC_2.34 {
     dladdr;
     dlclose;
     dlerror;
+    dlsym;
   }
   GLIBC_PRIVATE {
     __libc_dlerror_result;
@@ -18,7 +20,6 @@ libc {
 libdl {
   GLIBC_2.0 {
     dlopen;
-    dlsym;
   }
   GLIBC_2.1 {
     dlopen; dlvsym;
diff --git a/dlfcn/dlsym.c b/dlfcn/dlsym.c
index 26cea4ba6d..6b03b7b7ab 100644
--- a/dlfcn/dlsym.c
+++ b/dlfcn/dlsym.c
@@ -17,19 +17,9 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <dlfcn.h>
-#include <stddef.h>
-
 #include <ldsodefs.h>
-
-#if !defined SHARED && IS_IN (libdl)
-
-void *
-dlsym (void *handle, const char *name)
-{
-  return __dlsym (handle, name, RETURN_ADDRESS (0));
-}
-
-#else
+#include <shlib-compat.h>
+#include <stddef.h>
 
 struct dlsym_args
 {
@@ -50,17 +40,11 @@ dlsym_doit (void *a)
   args->sym = _dl_sym (args->handle, args->name, args->who);
 }
 
-
-void *
-__dlsym (void *handle, const char *name DL_CALLER_DECL)
+static void *
+dlsym_implementation (void *handle, const char *name, void *dl_caller)
 {
-# ifdef SHARED
-  if (!rtld_active ())
-    return _dlfcn_hook->dlsym (handle, name, DL_CALLER);
-# endif
-
   struct dlsym_args args;
-  args.who = DL_CALLER;
+  args.who = dl_caller;
   args.handle = handle;
   args.name = name;
 
@@ -73,7 +57,34 @@ __dlsym (void *handle, const char *name DL_CALLER_DECL)
 
   return result;
 }
-# ifdef SHARED
-strong_alias (__dlsym, dlsym)
+
+#ifdef SHARED
+void *
+___dlsym (void *handle, const char *name)
+{
+  if (!rtld_active ())
+    return _dlfcn_hook->dlsym (handle, name, RETURN_ADDRESS (0));
+  else
+    return dlsym_implementation (handle, name, RETURN_ADDRESS (0));
+}
+versioned_symbol (libc, ___dlsym, dlsym, GLIBC_2_34);
+
+# if OTHER_SHLIB_COMPAT (libdl, GLIBC_2_0, GLIBC_2_34)
+compat_symbol (libdl, ___dlsym, dlsym, GLIBC_2_0);
 # endif
-#endif
+
+#else /* !SHARED */
+/* Also used with _dlfcn_hook.  */
+void *
+__dlsym (void *handle, const char *name, void *dl_caller)
+{
+  return dlsym_implementation (handle, name, dl_caller);
+}
+
+void *
+___dlsym (void *handle, const char *name)
+{
+  return __dlsym (handle, name, RETURN_ADDRESS (0));
+}
+weak_alias (___dlsym, dlsym)
+#endif /* !SHARED */
diff --git a/dlfcn/sdlsym.c b/dlfcn/sdlsym.c
deleted file mode 100644
index 0234f23f8f..0000000000
--- a/dlfcn/sdlsym.c
+++ /dev/null
@@ -1 +0,0 @@
-#include "dlsym.c"
diff --git a/elf/Makefile b/elf/Makefile
index 834ec858a8..0ec736bb0f 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -699,7 +699,6 @@ include $(patsubst %,$(..)libof-iterator.mk,$(cpp-srcs-left))
 test-modules = $(addprefix $(objpfx),$(addsuffix .so,$(strip $(modules-names))))
 generated += $(addsuffix .so,$(strip $(modules-names)))
 
-$(objpfx)testobj1.so: $(libdl)
 $(objpfx)testobj1_1.so: $(objpfx)testobj1.so $(libdl)
 $(objpfx)testobj2.so: $(objpfx)testobj1.so $(libdl)
 $(objpfx)testobj3.so: $(libdl)
diff --git a/elf/dl-sym.c b/elf/dl-sym.c
index dfd6169e12..b34cc2f8eb 100644
--- a/elf/dl-sym.c
+++ b/elf/dl-sym.c
@@ -195,3 +195,4 @@ _dl_sym (void *handle, const char *name, void *who)
 {
   return do_sym (handle, name, who, NULL, DL_LOOKUP_RETURN_NEWEST);
 }
+libc_hidden_def (_dl_sym)
diff --git a/include/dlfcn.h b/include/dlfcn.h
index a018144808..2b174f8670 100644
--- a/include/dlfcn.h</