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authorJoseph Myers <joseph@codesourcery.com>2013-05-31 16:16:33 +0000
committerJoseph Myers <joseph@codesourcery.com>2013-05-31 16:16:33 +0000
commitfab7ce3f5b4060bf62659e8b58529de4156b5a2f (patch)
tree478613d49200afe992092d00c61f6fb82cec07b8 /Makerules
parenteca5920cd90093d8921f27bfbf7bcf54807165bb (diff)
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Link extra-libs consistently with libc and ld.so.
Diffstat (limited to 'Makerules')
-rw-r--r--Makerules40
1 files changed, 32 insertions, 8 deletions
diff --git a/Makerules b/Makerules
index d88bb62..2c25233 100644
--- a/Makerules
+++ b/Makerules
@@ -432,13 +432,33 @@ map-file = $(firstword $($(@F:.so=-map)) \
load-map-file = $(map-file:%=-Wl,--version-script=%)
endif
+# Compiler arguments to use to link a shared object with libc and
+# ld.so. This is intended to be as similar as possible to a default
+# link with an installed libc.
+link-libc-args = -Wl,--start-group \
+ $(libc-for-link) \
+ $(common-objpfx)libc_nonshared.a \
+ $(as-needed) $(elfobjdir)/ld.so $(no-as-needed) \
+ -Wl,--end-group
+
+# The corresponding shared libc to use. This may be modified for a
+# particular target.
+libc-for-link = $(common-objpfx)libc.so
+
+# The corresponding dependencies. As these are used in dependencies,
+# not just commands, they cannot use target-specific variables so need
+# to name both possible libc.so objects.
+link-libc-deps = $(common-objpfx)libc.so $(common-objpfx)linkobj/libc.so \
+ $(common-objpfx)libc_nonshared.a $(elfobjdir)/ld.so
+
# Pattern rule to build a shared object from an archive of PIC objects.
# This must come after the installation rules so Make doesn't try to
# build shared libraries in place from the installed *_pic.a files.
# $(LDLIBS-%.so) may contain -l switches to generate run-time dependencies
-# on other shared objects.
-lib%.so: lib%_pic.a $(+preinit) $(+postinit) $(+interp)
- $(build-shlib)
+# 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)
+ $(build-shlib) $(link-libc-args)
define build-shlib-helper
$(LINK.o) -shared $(static-libgcc) -Wl,-O1 $(sysdep-LDFLAGS) \
@@ -513,17 +533,19 @@ endef
# not for shared objects
define build-module
$(build-module-helper) -o $@ $(shlib-lds-flags) \
- $(csu-objpfx)abi-note.o $(build-module-objlist)
+ $(csu-objpfx)abi-note.o $(build-module-objlist) $(link-libc-args)
endef
define build-module-asneeded
$(build-module-helper) -o $@ $(shlib-lds-flags) \
$(csu-objpfx)abi-note.o \
- -Wl,--as-needed $(build-module-objlist) -Wl,--no-as-needed
+ -Wl,--as-needed $(build-module-objlist) -Wl,--no-as-needed \
+ $(link-libc-args)
endef
build-module-helper-objlist = \
$(patsubst %_pic.a,$(whole-archive) %_pic.a $(no-whole-archive),\
- $(filter-out %.lds $(map-file) $(+preinit) $(+postinit),$^))
+ $(filter-out %.lds $(map-file) $(+preinit) $(+postinit) \
+ $(link-libc-deps),$^))
build-module-objlist = $(build-module-helper-objlist) $(LDLIBS-$(@F:%.so=%).so)
build-shlib-objlist = $(build-module-helper-objlist) \
@@ -566,6 +588,9 @@ generated += libc_pic.opts libc_pic.os.clean
libc_pic_clean := .clean
endif
+# Do not filter ld.so out of libc.so link.
+$(common-objpfx)libc.so: link-libc-deps = # empty
+
# Use our own special initializer and finalizer files for libc.so.
$(common-objpfx)libc.so: $(elfobjdir)/soinit.os \
$(common-objpfx)libc_pic.os$(libc_pic_clean) \
@@ -621,8 +646,7 @@ include $(patsubst %,$(..)extra-modules.mk,$(modules-names))
extra-modules-build := $(filter-out $(modules-names-nobuild),$(modules-names))
$(extra-modules-build:%=$(objpfx)%.so): $(objpfx)%.so: \
- $(objpfx)%.os $(shlib-lds) \
- $(common-objpfx)libc.so $(common-objpfx)libc_nonshared.a
+ $(objpfx)%.os $(shlib-lds) $(link-libs-deps)
$(build-module)
endif