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#
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# In rhel-6.x the Makerules are not entirely as mature as they are
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# in glibc 2.21 (from which the example link-libc-args is taken from).
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# In rhel-6.x the applications are not built like their counterpart
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# real applications, and because of that compiling DSOs that use TLS
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# will fail with undefined references to __tls_get_addr which resides
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# in ld.so and is never included in the link. This patch enhances
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# only the build-module and build-module-asneeded targets to include
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# a more fully and correct link line as the compiler driver would use
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# when constructing an application or DSO. We do not adjust the link
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# lines used to build lib* targets.
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#
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# The rest of this patch is brought in by glibc-rh1292018-0a.patch
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# where we need to link against ld.so from libm.so.
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#
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commit fab7ce3f5b4060bf62659e8b58529de4156b5a2f
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Author: Joseph Myers <joseph@codesourcery.com>
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Date: Fri May 31 16:16:33 2013 +0000
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Link extra-libs consistently with libc and ld.so.
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diff -urN glibc-2.17-c758a686/Makerules glibc-2.17-c758a686/Makerules
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--- glibc-2.17-c758a686/Makerules 2015-02-18 19:53:00.000000000 -0500
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+++ glibc-2.17-c758a686/Makerules 2015-02-18 20:08:33.299000028 -0500
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@@ -437,6 +437,25 @@
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load-map-file = $(map-file:%=-Wl,--version-script=%)
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endif
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+# Compiler arguments to use to link a shared object with libc and
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+# ld.so. This is intended to be as similar as possible to a default
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+# link with an installed libc.
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+link-libc-args = -Wl,--start-group \
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+ $(libc-for-link) \
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+ $(common-objpfx)libc_nonshared.a \
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+ $(as-needed) $(elf-objpfx)ld.so $(no-as-needed) \
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+ -Wl,--end-group
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+
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+# The corresponding shared libc to use. This may be modified for a
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+# particular target.
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+libc-for-link = $(common-objpfx)libc.so
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+
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+# The corresponding dependencies. As these are used in dependencies,
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+# not just commands, they cannot use target-specific variables so need
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+# to name both possible libc.so objects.
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+link-libc-deps = $(common-objpfx)libc.so $(common-objpfx)linkobj/libc.so \
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+ $(common-objpfx)libc_nonshared.a $(elf-objpfx)ld.so
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+
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# Pattern rule to build a shared object from an archive of PIC objects.
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# This must come after the installation rules so Make doesn't try to
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# build shared libraries in place from the installed *_pic.a files.
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@@ -518,12 +537,13 @@
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# not for shared objects
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define build-module
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$(build-module-helper) -o $@ $(shlib-lds-flags) \
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- $(csu-objpfx)abi-note.o $(build-module-objlist)
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+ $(csu-objpfx)abi-note.o $(build-module-objlist) $(link-libc-args)
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endef
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define build-module-asneeded
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$(build-module-helper) -o $@ $(shlib-lds-flags) \
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$(csu-objpfx)abi-note.o \
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- -Wl,--as-needed $(build-module-objlist) -Wl,--no-as-needed
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+ -Wl,--as-needed $(build-module-objlist) -Wl,--no-as-needed \
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+ $(link-libc-args)
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endef
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build-module-helper-objlist = \
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