devkit: Remove .comment sections from sysroot objects

Otherwise the comment sections of C runtime objects, including those
in static libraries like libc_nonshared.a, contribute RPM package
version strings to the .comment section in devkit-produced binaries
and libraries.  These RPM package strings change frequently, even
across minor toolchain updates.  Their presence interferes when
comparing binaries built with devkits that use different sysroot RPM
package sets.

Author: fitzsim

make/devkit/Tools.gmk

@@ -324,6 +324,9 @@ $(foreach p,$(RPM_FILE_LIST),$(eval $(call unrpm,$(p))))
 # have it anyway, but just to make sure...
 # Patch libc.so and libpthread.so to force linking against libraries in sysroot
 # and not the ones installed on the build machine.
+# Remove comment sections from static libraries and C runtime objects
+# to prevent leaking RHEL-specific package versions into
+# devkit-produced binaries.
 $(libs) : $(rpms)
 	@echo Patching libc and pthreads
 	@(for f in `find $(SYSROOT) -name libc.so -o -name libpthread.so`; do \
@@ -333,6 +336,7 @@ $(libs) : $(rpms)
 	      -e 's|/lib/||g' ) > $$f.tmp ; \
 	  mv $$f.tmp $$f ; \
 	done)
+	@find $(SYSROOT) -name '*.[ao]' -exec objcopy --remove-section .comment '{}' ';'
 	@mkdir -p $(SYSROOT)/usr/lib
 	@touch $@