[glibc] Allow building on case insensitive filesystems

extra-lib.mk

 # This file is included several times in a row, once
 # for each element of $(extra-libs).  $(extra-libs-left)
 # is initialized first to $(extra-libs) so that with each
 # inclusion, we advance $(lib) to the next library name (e.g. libfoo).
 # The variable $($(lib)-routines) defines the list of modules
 # to be included in that library.  A sysdep Makefile can add to
 # $(lib)-sysdep_routines to include additional modules.
 
 lib := $(firstword $(extra-libs-left))
 extra-libs-left := $(filter-out $(lib),$(extra-libs-left))
 
 object-suffixes-$(lib) := $(filter-out $($(lib)-inhibit-o),$(object-suffixes))
 
 ifneq (,$($(lib)-static-only-routines))
 ifneq (,$(filter yesyes%,$(build-shared)$(elf)$($(lib).so-version)))
-object-suffixes-$(lib) += $(filter-out $($(lib)-inhibit-o),.oS)
+object-suffixes-$(lib) += $(filter-out $($(lib)-inhibit-o),.ons)
 endif
 endif
 
 ifneq (,$(object-suffixes-$(lib)))
 
 # Make sure these are simply-expanded variables before we append to them,
 # since we want the expressions we append to be expanded right now.
 install-lib := $(install-lib)
 extra-objs := $(extra-objs)
 
 # The modules that go in $(lib).
 all-$(lib)-routines := $($(lib)-routines) $($(lib)-sysdep_routines)
 
 # Add each flavor of library to the lists of things to build and install.
 install-lib += $(foreach o,$(object-suffixes-$(lib)),$(lib:lib%=$(libtype$o)))
-extra-objs += $(foreach o,$(filter-out .os .oS,$(object-suffixes-$(lib))),\
+extra-objs += $(foreach o,$(filter-out .os .ons,$(object-suffixes-$(lib))),\
                         $(patsubst %,%$o,$(filter-out \
                                            $($(lib)-shared-only-routines),\
                                            $(all-$(lib)-routines))))
 ifneq (,$(filter .os,$(object-suffixes-$(lib))))
 extra-objs += $(all-$(lib)-routines:%=%.os)
 endif
 alltypes-$(lib) := $(foreach o,$(object-suffixes-$(lib)),\
                              $(objpfx)$(patsubst %,$(libtype$o),\
                              $(lib:lib%=%)))
 
 ifeq (,$(filter $(lib),$(extra-libs-others)))
 lib-noranlib: $(alltypes-$(lib))
 ifeq (yes,$(build-shared))
 lib-noranlib: $(objpfx)$(lib).so$($(lib).so-version)
 endif
 else
 others: $(alltypes-$(lib))
 endif
 
 # The linked shared library is never a dependent of lib-noranlib,
 # because linking it will depend on libc.so already being built.
 ifneq (,$(filter .os,$(object-suffixes-$(lib))))
 others: $(objpfx)$(lib).so$($(lib).so-version)
 endif
 
 
 # Use o-iterator.mk to generate a rule for each flavor of library.
-ifneq (,$(filter-out .os .oS,$(object-suffixes-$(lib))))
+ifneq (,$(filter-out .os .ons,$(object-suffixes-$(lib))))
 define o-iterator-doit
 $(objpfx)$(patsubst %,$(libtype$o),$(lib:lib%=%)): \
   $(patsubst %,$(objpfx)%$o,\
              $(filter-out $($(lib)-shared-only-routines),\
                           $(all-$(lib)-routines))); \
         $$(build-extra-lib)
 endef
-object-suffixes-left = $(filter-out .os .oS,$(object-suffixes-$(lib)))
+object-suffixes-left = $(filter-out .os .ons,$(object-suffixes-$(lib)))
 include $(patsubst %,$(..)o-iterator.mk,$(object-suffixes-left))
 endif
 
 ifneq (,$(filter .os,$(object-suffixes-$(lib))))
 $(objpfx)$(patsubst %,$(libtype.os),$(lib:lib%=%)): \
   $(patsubst %,$(objpfx)%.os,\
              $(filter-out $($(lib)-static-only-routines),\
                           $(all-$(lib)-routines)))
         $(build-extra-lib)
 endif
 
-ifneq (,$(filter .oS,$(object-suffixes-$(lib))))
-$(objpfx)$(patsubst %,$(libtype.oS),$(lib:lib%=%)): \
-  $(patsubst %,$(objpfx)%.oS,\
+ifneq (,$(filter .ons,$(object-suffixes-$(lib))))
+$(objpfx)$(patsubst %,$(libtype.ons),$(lib:lib%=%)): \
+  $(patsubst %,$(objpfx)%.ons,\
              $(filter $($(lib)-static-only-routines),\
                       $(all-$(lib)-routines)))
         $(build-extra-lib)
 endif
 
 ifeq ($(versioning),yes)
 # Add the version script to the dependencies of the shared library.
 $(objpfx)$(lib).so: $(firstword $($(lib)-map) \
                                 $(addprefix $(common-objpfx), \
                                             $(filter $(lib).map, \
                                                      $(version-maps))))
 endif
 
 endif
 
 # This will define `libof-ROUTINE := LIB' for each of the routines.
 cpp-srcs-left := $($(lib)-routines) $($(lib)-sysdep_routines)
 ifneq (,$(cpp-srcs-left))
 include $(patsubst %,$(..)cppflags-iterator.mk,$(cpp-srcs-left))
 endif
 
 CPPFLAGS-$(lib) := -DNOT_IN_libc=1 -DIS_IN_$(lib)=1