Include .interp section only for libc.so

Barring libc.so and libdl.so, none of the libraries have any entry
points, so it is pointless to add a .interp section for them.  The
libdl.so entry point (in dlfcn/eval.c) is also defunct, so remove that
file as well.

Build tested for x86_64, ppc64 and s390x.  I have not moved
CFLAGS-interp.c to CPPFLAGS-interp.c isnce I'll be removing it
completely in a follow-up patch.

Siddhesh

	* Makerules (lib%.so): Don't include $(+interp) in
	prerequisites.
	* elf/Makefile (CFLAGS-interp.c): Don't define NOT_IN_libc.
	* dlfcn/eval.c: Remove file.

ChangeLog

@@ -1,5 +1,10 @@
 2014-09-16  Siddhesh Poyarekar  <siddhesh@redhat.com>
 
+	* Makerules (lib%.so): Don't include $(+interp) in
+	prerequisites.
+	* elf/Makefile (CFLAGS-interp.c): Don't define NOT_IN_libc.
+	* dlfcn/eval.c: Remove file.
+
 	* posix/getconf.c (vars): Don't check for _[SP]C_* and _CS
 	macros.
 

Makerules

@@ -436,7 +436,7 @@ link-libc-deps = $(common-objpfx)libc.so $(common-objpfx)linkobj/libc.so \
 # $(LDLIBS-%.so) may contain -l switches to generate run-time dependencies
 # on other shared objects.  The linking with libc and ld.so is intended
 # to be as similar as possible to a default link with an installed libc.
-lib%.so: lib%_pic.a $(+preinit) $(+postinit) $(+interp) $(link-libc-deps)
+lib%.so: lib%_pic.a $(+preinit) $(+postinit) $(link-libc-deps)
 	$(build-shlib) $(link-libc-args)
 
 define build-shlib-helper

elf/Makefile

@@ -354,8 +354,7 @@ $(objpfx)ld.so: $(objpfx)librtld.os $(ld-map)
 	mv -f $@.new $@
 
 # interp.c exists just to get this string into the libraries.
-CFLAGS-interp.c = -D'RUNTIME_LINKER="$(rtlddir)/$(rtld-installed-name)"' \
-		  -DNOT_IN_libc=1
+CFLAGS-interp.c = -D'RUNTIME_LINKER="$(rtlddir)/$(rtld-installed-name)"'
 $(objpfx)interp.os: $(common-objpfx)config.make
 
 ifneq (ld.so,$(rtld-installed-name))