[PATCH] x86-64: fix vDSO build

[Jan Beulich]

Certain ld versions (observed with 2.20.0) put an empty .rela.dyn
section into shared object files, breaking the assumption on the number
of sections to be copied to the final output. Simply discard any empty
SHT_REL and SHT_RELA sections to address this.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
---
 arch/x86/vdso/vdso2c.h |    3 +++
 1 file changed, 3 insertions(+)

--- 3.16-rc3/arch/x86/vdso/vdso2c.h
+++ 3.16-rc3-x86-vdso-build/arch/x86/vdso/vdso2c.h
@@ -93,6 +93,9 @@ static void BITSFUNC(copy_section)(struc
 	uint64_t flags = GET_LE(&in->sh_flags);
 
 	bool copy = flags & SHF_ALLOC &&
+		(GET_LE(&in->sh_size) ||
+		 (GET_LE(&in->sh_type) != SHT_RELA &&
+		  GET_LE(&in->sh_type) != SHT_REL)) &&
 		strcmp(name, ".altinstructions") &&
 		strcmp(name, ".altinstr_replacement");
 



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