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Support after-link variable to run a final step on binaries.
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11
ChangeLog
11
ChangeLog
@ -1,3 +1,14 @@
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2015-02-12 Roland McGrath <roland@hack.frob.com>
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* Makeconfig (after-link): New variable.
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(+link-pie, +link-pie-tests): Use it.
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(+link-static, +link-static-tests): Likewise.
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(+link, +link-tests): Likewise.
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* Makerules (build-module, build-module-asneeded): Likewise.
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(lib%.so, $(common-objpfx)libc.so, $(common-objpfx)linkobj/libc.so):
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Likewise.
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* elf/Makefile ($(objpfx)ld.so): Likewise.
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2015-02-12 Rüdiger Sonderfeld <ruediger@c-plusplus.net>
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[BZ #17965]
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46
Makeconfig
46
Makeconfig
@ -387,6 +387,14 @@ LDFLAGS.so += $(hashstyle-LDFLAGS)
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LDFLAGS-rtld += $(hashstyle-LDFLAGS)
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endif
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# Command to run after every final link (executable or shared object).
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# This is invoked with $(call after-link,...), so it should operate on
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# the file $1. This can be set to do some sort of post-processing on
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# binaries, or to perform some sort of static sanity check.
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ifndef after-link
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after-link =
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endif
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# Command for linking PIE programs with the C library.
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ifndef +link-pie
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+link-pie-before-libc = $(CC) -pie -Wl,-O1 -nostdlib -nostartfiles -o $@ \
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@ -400,10 +408,15 @@ ifndef +link-pie
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$(common-objpfx)libc% $(+postinit),$^) \
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$(link-extra-libs)
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+link-pie-after-libc = $(+postctorS) $(+postinit)
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+link-pie = $(+link-pie-before-libc) $(rtld-LDFLAGS) $(link-libc) \
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$(+link-pie-after-libc)
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+link-pie-tests = $(+link-pie-before-libc) $(rtld-tests-LDFLAGS) \
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$(link-libc-tests) $(+link-pie-after-libc)
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define +link-pie
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$(+link-pie-before-libc) $(rtld-LDFLAGS) $(link-libc) $(+link-pie-after-libc)
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$(call after-link,$@)
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endef
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define +link-pie-tests
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$(+link-pie-before-libc) $(rtld-tests-LDFLAGS) $(link-libc-tests) \
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$(+link-pie-after-libc)
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$(call after-link,$@)
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endef
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endif
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# Command for statically linking programs with the C library.
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ifndef +link-static
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@ -417,10 +430,14 @@ ifndef +link-static
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$(common-objpfx)libc% $(+postinit),$^) \
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$(link-extra-libs-static)
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+link-static-after-libc = $(+postctorT) $(+postinit)
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+link-static = $(+link-static-before-libc) $(link-libc-static) \
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$(+link-static-after-libc)
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+link-static-tests = $(+link-static-before-libc) $(link-libc-static-tests) \
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$(+link-static-after-libc)
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define +link-static
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$(+link-static-before-libc) $(link-libc-static) $(+link-static-after-libc)
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$(call after-link,$@)
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endef
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define +link-static-tests
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$(+link-static-before-libc) $(link-libc-static-tests) $(+link-static-after-libc)
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$(call after-link,$@)
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endef
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endif
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# Commands for linking programs with the C library.
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ifndef +link
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@ -436,10 +453,15 @@ ifeq (yes,$(build-shared))
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$(common-objpfx)libc% $(+postinit),$^) \
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$(link-extra-libs)
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+link-after-libc = $(+postctor) $(+postinit)
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+link = $(+link-before-libc) $(rtld-LDFLAGS) $(link-libc) \
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$(+link-after-libc)
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+link-tests = $(+link-before-libc) $(rtld-tests-LDFLAGS) \
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$(link-libc-tests) $(+link-after-libc)
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define +link
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$(+link-before-libc) $(rtld-LDFLAGS) $(link-libc) $(+link-after-libc)
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$(call after-link,$@)
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endef
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define +link-tests
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$(+link-before-libc) $(rtld-tests-LDFLAGS) $(link-libc-tests) \
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$(+link-after-libc)
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$(call after-link,$@)
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endef
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else
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+link = $(+link-static)
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+link-tests = $(+link-static-tests)
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@ -505,6 +505,7 @@ link-libc-deps = $(common-objpfx)libc.so $(common-objpfx)linkobj/libc.so \
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# to be as similar as possible to a default link with an installed libc.
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lib%.so: lib%_pic.a $(+preinit) $(+postinit) $(link-libc-deps)
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$(build-shlib) $(link-libc-args)
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$(call after-link,$@)
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define build-shlib-helper
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$(LINK.o) -shared $(static-libgcc) -Wl,-O1 $(sysdep-LDFLAGS) \
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@ -580,12 +581,14 @@ endef
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define build-module
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$(build-module-helper) -o $@ $(shlib-lds-flags) \
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$(csu-objpfx)abi-note.o $(build-module-objlist) $(link-libc-args)
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$(call after-link,$@)
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endef
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define build-module-asneeded
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$(build-module-helper) -o $@ $(shlib-lds-flags) \
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$(csu-objpfx)abi-note.o \
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-Wl,--as-needed $(build-module-objlist) -Wl,--no-as-needed \
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$(link-libc-args)
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$(call after-link,$@)
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endef
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build-module-helper-objlist = \
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@ -666,6 +669,7 @@ $(common-objpfx)libc.so: $(elf-objpfx)soinit.os \
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$(elf-objpfx)ld.so \
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$(shlib-lds)
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$(build-shlib)
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$(call after-link,$@)
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$(common-objpfx)linkobj/libc.so: $(elf-objpfx)soinit.os \
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$(common-objpfx)linkobj/libc_pic.a \
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@ -674,6 +678,7 @@ $(common-objpfx)linkobj/libc.so: $(elf-objpfx)soinit.os \
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$(elf-objpfx)ld.so \
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$(shlib-lds)
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$(build-shlib)
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$(call after-link,$@)
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ifeq ($(build-shared),yes)
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$(common-objpfx)libc.so: $(common-objpfx)libc.map
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@ -349,6 +349,7 @@ $(objpfx)ld.so: $(objpfx)librtld.os $(ld-map)
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$(filter-out $(map-file),$^) $(load-map-file) \
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-Wl,-soname=$(rtld-installed-name) \
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-Wl,-defsym=_begin=0
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$(call after-link,$@.new)
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$(READELF) -s $@.new \
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| $(AWK) '($$7 ~ /^UND(|EF)$$/ && $$1 != "0:" && $$4 != "REGISTER") { print; p=1 } END { exit p != 0 }'
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mv -f $@.new $@
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