db1988f038
Similar to D66992. In GNU ld, a -u specified symbol is a STB_DEFAULT undefined. It cannot be changed to STB_WEAK by a later STB_WEAK undefined in a regular object file. The behavior is consistent with our model because -u means "we need to fetch a lazy definition". It should not be altered just because there is also a STB_WEAK undefined. Note, our -u semantics are still different from GNU ld (https://github.com/ClangBuiltLinux/linux/issues/515): we don't force the specified symbol to appear in .symtab This is a deliberate decision. Reviewed By: grimar Differential Revision: https://reviews.llvm.org/D88945
36 lines
972 B
ArmAsm
36 lines
972 B
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t1.o
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# RUN: echo -e '.globl foo\nfoo: ret' | \
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# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux - -o %t2.o
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# RUN: ld.lld -shared -o %t.so %t1.o --start-lib %t2.o
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# RUN: llvm-readobj --dyn-syms %t.so | FileCheck %s
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# RUN: ld.lld -pie -o %t %t1.o --start-lib %t2.o
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# RUN: llvm-readobj --dyn-syms %t | FileCheck %s
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# CHECK: Name: foo
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# CHECK-NEXT: Value: 0x0
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# CHECK-NEXT: Size: 0
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# CHECK-NEXT: Binding: Weak
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# CHECK-NEXT: Type: None
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# CHECK-NEXT: Other: 0
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# CHECK-NEXT: Section: Undefined
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## -u specifies a STB_DEFAULT undefined symbol, so the definition from %t2.o is
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## fetched.
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# RUN: ld.lld -u foo %t1.o --start-lib %t2.o -o %t1
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# RUN: llvm-readobj --syms %t1 | FileCheck %s --check-prefix=CHECK-U
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# CHECK-U: Name: foo
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# CHECK-U: Binding:
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# CHECK-U-SAME: Global
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# CHECK-U: Section:
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# CHECK-U-SAME: .text
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.weak foo
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call foo@PLT
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.data
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.quad foo
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