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When building gcc with some specific LDFLAGS_FOR_TARGET, e.g.
LDFLAGS_FOR_TARGET=-Wl,-z,relro,-z,now
those flags propagate info linking of target shared libraries,
e.g. lib{ubsan,tsan,stdc++,quadmath,objc,lsan,itm,gphobos,gdruntime,gomp,go,gfortran,atomic,asan}.so.*
but there is one important exception, libgcc_s.so.* linking ignores it.
The following patch fixes that.
Bootstrapped/regtested on x86_64-linux with LDFLAGS_FOR_TARGET=-Wl,-z,relro,-z,now
and verified that libgcc_s.so.* is BIND_NOW when it previously wasn't, and
without any LDFLAGS_FOR_TARGET on x86_64-linux and i686-linux.
There on x86_64-linux I've verified that the libgcc_s.so.1 linking command
line for -m64 is identical except for whitespace to one without the patch,
and for -m32 multilib $(LDFLAGS) actually do supply there an extra -m32
that also repeats later in the @multilib_flags@, which should be harmless.
2021-08-04 Jakub Jelinek <jakub@redhat.com>
* config/t-slibgcc (SHLIB_LINK): Add $(LDFLAGS).
* config/t-slibgcc-darwin (SHLIB_LINK): Likewise.
* config/t-slibgcc-vms (SHLIB_LINK): Likewise.
* config/t-slibgcc-fuchsia (SHLIB_LDFLAGS): Remove $(LDFLAGS).
29 lines
1.3 KiB
Plaintext
29 lines
1.3 KiB
Plaintext
shlib_version:=$(shell $(CC) --version 2>&1 | \
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sed -n 's/^.*(GCC).* \([0-9]*\.[0-9.]*\).*$/\1/p' | \
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sed -e 's/\./,/' -e 's/\.//g')
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SHLIB_EXT = .exe
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SHLIB_OBJS = @shlib_objs@
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SHLIB_NAME = @shlib_base_name@.exe
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SHLIB_MULTILIB =
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SHLIB_INSTALL = $(INSTALL_DATA) $(SHLIB_NAME) $(DESTDIR)$(libsubdir)/$(SHLIB_NAME)
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SHLIB_SYMVEC = \
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grep -F -e "\$$BSS\$$" -e "\$$DATA\$$" -e " sdata " -e " data.rel " -e " data.rel.ro " -e " sbss " \
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-e "\$$LINK\$$" -e "\$$READONLY\$$" | \
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sed -e "s/.*\$$LINK\$$ \(.*\)/SYMBOL_VECTOR=(\1=PROCEDURE)/" \
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-e "s/.*\$$DATA\$$ \(.*\)/SYMBOL_VECTOR=(\1=DATA)/" \
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-e "s/.* sbss \(.*\)/SYMBOL_VECTOR=(\1=DATA)/" \
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-e "s/.* sdata \(.*\)/SYMBOL_VECTOR=(\1=DATA)/" \
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-e "s/.* data.rel \(.*\)/SYMBOL_VECTOR=(\1=DATA)/" \
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-e "s/.* data.rel.ro \(.*\)/SYMBOL_VECTOR=(\1=DATA)/" \
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-e "s/.*\$$BSS\$$ \(.*\)/SYMBOL_VECTOR=(\1=DATA)/" \
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-e "s/.*\$$READONLY\$$ \(.*\)/SYMBOL_VECTOR=(\1=DATA)/"
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SHLIB_LINK = \
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echo "case_sensitive=yes" > SYMVEC_$$$$.opt; \
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objdump --syms $(SHLIB_OBJS) | \
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$(SHLIB_SYMVEC) >> SYMVEC_$$$$.opt ; \
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echo "case_sensitive=NO" >> SYMVEC_$$$$.opt; \
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$(CC) $(LIBGCC2_CFLAGS) $(LDFLAGS) -nodefaultlibs \
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-shared --for-linker=/noinform -o $(SHLIB_NAME) $(SHLIB_OBJS) \
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--for-linker=SYMVEC_$$$$.opt \
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--for-linker=gsmatch=equal,$(shlib_version)
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