Stop test-in-container trying to run other-OS binaries

[Joseph Myers]

I noticed that, now that build-many-glibcs.py no longer copies glibc
sources, I was getting core dumps in my glibc source directories.  The
cause appears to be, from the i686-gnu build:

# Copy these DSOs first so we can overwrite them with our own.
for dso in ` env LD_TRACE_LOADED_OBJECTS=1  \
        /scratch/jmyers/glibc-bot/build/glibcs/i686-gnu/glibc/elf/ld.so.1 \
        /scratch/jmyers/glibc-bot/build/glibcs/i686-gnu/glibc/testroot.pristine/bin/sh \
[...]
Segmentation fault (core dumped)

In this case, the x86 architecture means the binary executes, but
dumps core rather than actually working.

Anything involving running the newly built glibc should only be done
ifeq ($(run-built-tests),yes).  This patch conditions the relevant
part of the testroot setup accordingly.

Tested for x86_64, and with build-many-glibcs.py for i686-gnu.

2018-12-04  Joseph Myers  <joseph@codesourcery.com>

	* Makefile ($(objpfx)testroot.pristine/install.stamp): Do not run
	dynamic linker unless [$(run-built-tests) = yes].

diff --git a/Makefile b/Makefile
index b4703e48fe..fd73d9bae3 100644
--- a/Makefile
+++ b/Makefile
@@ -374,6 +374,7 @@ $(objpfx)testroot.pristine/install.stamp :
 	cp $(objpfx)support/shell-container $(objpfx)testroot.pristine/bin/sh
 	cp $(objpfx)support/echo-container $(objpfx)testroot.pristine/bin/echo
 	cp $(objpfx)support/true-container $(objpfx)testroot.pristine/bin/true
+ifeq ($(run-built-tests),yes)
 	# Copy these DSOs first so we can overwrite them with our own.
 	for dso in `$(test-wrapper-env) LD_TRACE_LOADED_OBJECTS=1  \
 		$(objpfx)elf/$(rtld-installed-name) \
@@ -393,6 +394,7 @@ $(objpfx)testroot.pristine/install.stamp :
 	      mkdir -p `dirname $(objpfx)testroot.pristine$$dso` ;\
 	    $(test-wrapper) cp $$dso $(objpfx)testroot.pristine$$dso ;\
 	  done
+endif
 	$(MAKE) install DESTDIR=$(objpfx)testroot.pristine
 	touch $(objpfx)testroot.pristine/install.stamp
 

-- 
Joseph S. Myers
joseph@codesourcery.com