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libgcc: Honor LDFLAGS_FOR_TARGET when linking libgcc_s
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When building gcc with some specific LDFLAGS_FOR_TARGET, e.g.
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LDFLAGS_FOR_TARGET=-Wl,-z,relro,-z,now
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those flags propagate info linking of target shared libraries,
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e.g. lib{ubsan,tsan,stdc++,quadmath,objc,lsan,itm,gphobos,gdruntime,gomp,go,gfortran,atomic,asan}.so.*
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but there is one important exception, libgcc_s.so.* linking ignores it.
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The following patch fixes that.
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Bootstrapped/regtested on x86_64-linux with LDFLAGS_FOR_TARGET=-Wl,-z,relro,-z,now
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and verified that libgcc_s.so.* is BIND_NOW when it previously wasn't, and
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without any LDFLAGS_FOR_TARGET on x86_64-linux and i686-linux.
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There on x86_64-linux I've verified that the libgcc_s.so.1 linking command
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line for -m64 is identical except for whitespace to one without the patch,
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and for -m32 multilib $(LDFLAGS) actually do supply there an extra -m32
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that also repeats later in the @multilib_flags@, which should be harmless.
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2021-08-04 Jakub Jelinek <jakub@redhat.com>
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* config/t-slibgcc (SHLIB_LINK): Add $(LDFLAGS).
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* config/t-slibgcc-darwin (SHLIB_LINK): Likewise.
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* config/t-slibgcc-vms (SHLIB_LINK): Likewise.
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--- libgcc/config/t-slibgcc
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+++ libgcc/config/t-slibgcc
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@@ -32,7 +32,7 @@ SHLIB_INSTALL_SOLINK = $(LN_S) $(SHLIB_SONAME) \
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$(DESTDIR)$(slibdir)$(SHLIB_SLIBDIR_QUAL)/$(SHLIB_SOLINK)
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SHLIB_LINK = $(CC) $(LIBGCC2_CFLAGS) -shared -nodefaultlibs \
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- $(SHLIB_LDFLAGS) \
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+ $(SHLIB_LDFLAGS) $(LDFLAGS) \
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-o $(SHLIB_DIR)/$(SHLIB_SONAME).tmp @multilib_flags@ \
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$(SHLIB_OBJS) $(SHLIB_LC) && \
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rm -f $(SHLIB_DIR)/$(SHLIB_SOLINK) && \
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--- libgcc/config/t-slibgcc-darwin
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+++ libgcc/config/t-slibgcc-darwin
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@@ -15,7 +15,7 @@ SHLIB_LC = -lc
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# Note that this version is used for the loader, not the linker; the linker
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# uses the stub versions named by the versioned members of $(INSTALL_FILES).
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-SHLIB_LINK = $(CC) $(LIBGCC2_CFLAGS) -dynamiclib -nodefaultlibs \
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+SHLIB_LINK = $(CC) $(LIBGCC2_CFLAGS) $(LDFLAGS) -dynamiclib -nodefaultlibs \
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-install_name @shlib_slibdir@/$(SHLIB_INSTALL_NAME) \
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-single_module -o $(SHLIB_DIR)/$(SHLIB_SONAME) \
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-Wl,-exported_symbols_list,$(SHLIB_MAP) \
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--- libgcc/config/t-slibgcc-vms
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+++ libgcc/config/t-slibgcc-vms
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@@ -22,7 +22,7 @@ SHLIB_LINK = \
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objdump --syms $(SHLIB_OBJS) | \
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$(SHLIB_SYMVEC) >> SYMVEC_$$$$.opt ; \
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echo "case_sensitive=NO" >> SYMVEC_$$$$.opt; \
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- $(CC) $(LIBGCC2_CFLAGS) -nodefaultlibs \
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+ $(CC) $(LIBGCC2_CFLAGS) $(LDFLAGS) -nodefaultlibs \
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-shared --for-linker=/noinform -o $(SHLIB_NAME) $(SHLIB_OBJS) \
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--for-linker=SYMVEC_$$$$.opt \
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--for-linker=gsmatch=equal,$(shlib_version)
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