Adding a new config option, mind if I check this in?

[Rob Landley]

I'm getting the svn version of uClibc to compile under FWL again so I can
do nightly builds of cross compiler toolchains and root filesystems for
downloads/binaries.  (I'll move the current stuff into a 0.9.30 directory
and add a "snapshot" directory, or something, before I set up the
cron job.)

Anyway, I'm trying to get the number of patches I carry in FWL down to
a dull roar.  This is a patch I've had in FWL forever, cleaned up and ready
to submit.  Sound reasonable?  (There's a help entry at the end explaining
why.)

Rob

--- uClibc/Makefile.in	(revision 25418)
+++ uClibc/Makefile.in	(working copy)
@@ -402,6 +402,7 @@
 		$(LN) -sf $(RUNTIME_PREFIX_LIB_FROM_DEVEL_PREFIX_LIB)$$i.$(MAJOR_VERSION) \
 		$(PREFIX)$(DEVEL_PREFIX)lib/$$i; \
 	done
+ifeq ($(HARDWIRED_ABSPATH),y)
 	if [ -f $(top_builddir)lib/libc.so -a -f $(PREFIX)$(RUNTIME_PREFIX)lib/$(SHARED_MAJORNAME) ] ; 
then \
 		$(RM) $(PREFIX)$(DEVEL_PREFIX)lib/libc.so; \
 		$(SED) -e 's:$(NONSHARED_LIBNAME):$(DEVEL_PREFIX)lib/$(NONSHARED_LIBNAME):' \
@@ -409,16 +410,23 @@
 		    -e 's:$(UCLIBC_LDSO):$(RUNTIME_PREFIX)lib/$(UCLIBC_LDSO):' \
 		    $(top_builddir)lib/libc.so > $(PREFIX)$(DEVEL_PREFIX)lib/libc.so; \
 	fi
+else
+	-$(INSTALL) -m 644 lib/libc.so $(PREFIX)$(DEVEL_PREFIX)lib/
+endif
 ifeq ($(UCLIBC_HAS_THREADS),y)
 ifneq ($(LINUXTHREADS_OLD),y)
+ifeq ($(HARDWIRED_ABSPATH),y)
 	if [ -f $(top_builddir)lib/libpthread.so -a -f $(PREFIX)$(RUNTIME_PREFIX)lib/libpthread.so.
$(MAJOR_VERSION) ] ; then \
 		$(RM) $(PREFIX)$(DEVEL_PREFIX)lib/libpthread.so; \
 		cp $(top_srcdir)extra/scripts/format.lds $(PREFIX)$(DEVEL_PREFIX)lib/libpthread.so; \
 		echo "GROUP ( $(RUNTIME_PREFIX)lib/libpthread.so.$(MAJOR_VERSION) 
$(DEVEL_PREFIX)lib/libpthread_nonshared.a )" \
 			>> $(PREFIX)$(DEVEL_PREFIX)lib/libpthread.so; \
 	fi
+else
+	-$(INSTALL) -m 644 lib/libpthread.so $(PREFIX)$(DEVEL_PREFIX)lib/
 endif
 endif
+endif
 ifeq ($(PTHREADS_DEBUG_SUPPORT),y)
 	$(LN) -sf $(RUNTIME_PREFIX_LIB_FROM_DEVEL_PREFIX_LIB)libthread_db.so.1 \
 		$(PREFIX)$(DEVEL_PREFIX)lib/libthread_db.so
--- uClibc/extra/Configs/Config.in	(revision 25418)
+++ uClibc/extra/Configs/Config.in	(working copy)
@@ -1812,6 +1812,26 @@
 	  For a typical target system this should be set to "/usr", such that
 	  'make install' will install /usr/include/<header files>.
 
+config HARDWIRED_ABSPATH
+	string "Hardwire absolute paths into linker scripts"
+	default y
+	help
+	  This prepends absolute paths to the libraries mentioned in linker
+	  scripts such as libc.so.
+
+	  This is a build time optimization.  It has no impact on dynamic
+	  linking at runtime, which doesn't use linker scripts.
+
+	  You must disable this to use uClibc with a relocatable toolchain,
+	  such as the prebuilt binary cross compilers at
+	  http://uclibc.org/downloads/binaries which may be installed at an
+	  arbitrary location (such as in a user's home directory).
+
+	  The amount of time saved by this optimization is actually too small to
+	  measure. The linker just had to search the library path to find the
+	  linker script, so the dentries are cache hot if it has to search the
+	  same path again.  But it's what glibc does, so we do it too.
+
 endmenu