hanchenye-llvm-project/lld/test/ELF/verneed-as-needed-weak.s

# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
# RUN: ld.lld %t.o --as-needed %S/Inputs/verneed1.so -o %t
# RUN: llvm-readobj -V %t | FileCheck %s

# CHECK:       SHT_GNU_verneed {
# CHECK-NEXT:  }

.weak f1

.globl _start
_start:
.data
.quad f1
ELF: Compute used bit for --as-needed during symbol resolution. We can now use this to decide whether to emit a verneed during the final pass over the symbols. We were previously wrongly creating a verneed entry in the case where all references to a DSO's symbols were weak. In a future change we may also want to use the used bit to control whether shared symbols are preemptible and appear in the dynsym. This seems a little tricky to do at the moment because isNeeded() is templated. The only other functional change here is that we emit a DT_NEEDED for DSOs whose symbols are all preempted by objects that appear later in the link. But that doesn't seem too important to me. Differential Revision: http://reviews.llvm.org/D21171 llvm-svn: 272282 2016-06-10 02:01:35 +08:00			`# REQUIRES: x86`
			`# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o`
			`# RUN: ld.lld %t.o --as-needed %S/Inputs/verneed1.so -o %t`
			`# RUN: llvm-readobj -V %t \| FileCheck %s`

			`# CHECK: SHT_GNU_verneed {`
			`# CHECK-NEXT: }`

			`.weak f1`

			`.globl _start`
			`_start:`
			`.data`
Also reject 32 bit dynamic relocs when producing executable. They point to a shared library, so they would still overflow at runtime. llvm-svn: 272303 2016-06-10 04:35:27 +08:00			`.quad f1`