llvm-project/lld/test/ELF/exclude-libs-undef.s

# REQUIRES: x86
## Test we don't assign VER_NDX_LOCAL to an undefined symbol.
## If we do, an undefined weak will become non-preemptible,
## and we will report an error when an R_PLT_PC (optimized to R_PC)
## references the undefined weak (considered absolute).

# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
# RUN: rm -f %t.a
# RUN: llvm-ar rc %t.a %t.o
# RUN: ld.lld -shared --whole-archive --exclude-libs=ALL %t.a -o %t.so
# RUN: llvm-readelf --dyn-syms %t.so | FileCheck %s

# CHECK:     1: {{.*}} WEAK DEFAULT UND bar
# CHECK-NOT: 2:

.globl foo
.weak bar
foo:
  call bar
[ELF] --exclude-libs: don't assign VER_NDX_LOCAL to undefined symbols Suggested by Peter Collingbourne. Non-VER_NDX_GLOBAL versions should not be assigned to defined symbols. --exclude-libs violates this and can cause a spurious error "cannot refer to absolute symbol" after D71795. excludeLibs incorrectly assigns VER_NDX_LOCAL to an undefined weak symbol => isPreemptible is false => R_PLT_PC is optimized to R_PC => in isStaticLinkTimeConstant, an error is emitted. Reviewed By: pcc, grimar Differential Revision: https://reviews.llvm.org/D72681 2020-01-14 13:30:05 +08:00			`# REQUIRES: x86`
			`## Test we don't assign VER_NDX_LOCAL to an undefined symbol.`
			`## If we do, an undefined weak will become non-preemptible,`
			`## and we will report an error when an R_PLT_PC (optimized to R_PC)`
			`## references the undefined weak (considered absolute).`

			`# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o`
			`# RUN: rm -f %t.a`
			`# RUN: llvm-ar rc %t.a %t.o`
			`# RUN: ld.lld -shared --whole-archive --exclude-libs=ALL %t.a -o %t.so`
			`# RUN: llvm-readelf --dyn-syms %t.so \| FileCheck %s`

			`# CHECK: 1: {{.*}} WEAK DEFAULT UND bar`
			`# CHECK-NOT: 2:`

			`.globl foo`
			`.weak bar`
			`foo:`
			`call bar`