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llvm-project/lld/test/ELF/weak-undef-lib.s

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Fix an issue that weak bit is dropped when there's a lazy object symbol. Previously, we accidentally dropped STB_WEAK bit from an undefined symbol if there is a lazy object symbol with the same name. That caused a compatibility issue with GNU gold. llvm-svn: 325316
2018-02-16 12:27:46 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t1.o
# RUN: echo -e '.globl foo\nfoo: ret' | \
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux - -o %t2.o
# RUN: ld.lld -shared -o %t.so %t1.o --start-lib %t2.o
[test] Change llvm-readobj -long-option to --long-option or well-known short options. NFC Also change some options that have different semantics (cause confusion) in llvm-readelf mode: -s => -S -t => --symbols -sd => --section-data llvm-svn: 359651
2019-05-01 13:49:01 +08:00
# RUN: llvm-readobj --dyn-syms %t.so | FileCheck %s
Fix an issue that weak bit is dropped when there's a lazy object symbol. Previously, we accidentally dropped STB_WEAK bit from an undefined symbol if there is a lazy object symbol with the same name. That caused a compatibility issue with GNU gold. llvm-svn: 325316
2018-02-16 12:27:46 +08:00
[ELF] Fix includeInDynsym() when an undefined weak is merged with a lazy definition An undefined weak does not fetch the lazy definition. A lazy weak symbol should be considered undefined, and thus preemptible if .dynsym exists. D71795 is not quite an NFC. It errors on an R_X86_64_PLT32 referencing an undefined weak symbol. isPreemptible is false (incorrect) => R_PLT_PC is optimized to R_PC => in isStaticLinkTimeConstant, an error is emitted when an R_PC is applied on an undefined weak (considered absolute).
2020-01-10 07:53:52 +08:00
# RUN: ld.lld -pie -o %t %t1.o --start-lib %t2.o
# RUN: llvm-readobj --dyn-syms %t | FileCheck %s
Fix an issue that weak bit is dropped when there's a lazy object symbol. Previously, we accidentally dropped STB_WEAK bit from an undefined symbol if there is a lazy object symbol with the same name. That caused a compatibility issue with GNU gold. llvm-svn: 325316
2018-02-16 12:27:46 +08:00
# CHECK: Name: foo
# CHECK-NEXT: Value: 0x0
# CHECK-NEXT: Size: 0
# CHECK-NEXT: Binding: Weak
# CHECK-NEXT: Type: None
# CHECK-NEXT: Other: 0
# CHECK-NEXT: Section: Undefined
[ELF] Don't change binding to STB_WEAK for an undefined specified by -u 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
2020-10-07 23:45:24 +08:00
## -u specifies a STB_DEFAULT undefined symbol, so the definition from %t2.o is
## fetched.
# RUN: ld.lld -u foo %t1.o --start-lib %t2.o -o %t1
# RUN: llvm-readobj --syms %t1 | FileCheck %s --check-prefix=CHECK-U
# CHECK-U: Name: foo
# CHECK-U: Binding:
# CHECK-U-SAME: Global
# CHECK-U: Section:
# CHECK-U-SAME: .text
Fix an issue that weak bit is dropped when there's a lazy object symbol. Previously, we accidentally dropped STB_WEAK bit from an undefined symbol if there is a lazy object symbol with the same name. That caused a compatibility issue with GNU gold. llvm-svn: 325316
2018-02-16 12:27:46 +08:00
.weak foo
[ELF] Fix includeInDynsym() when an undefined weak is merged with a lazy definition An undefined weak does not fetch the lazy definition. A lazy weak symbol should be considered undefined, and thus preemptible if .dynsym exists. D71795 is not quite an NFC. It errors on an R_X86_64_PLT32 referencing an undefined weak symbol. isPreemptible is false (incorrect) => R_PLT_PC is optimized to R_PC => in isStaticLinkTimeConstant, an error is emitted when an R_PC is applied on an undefined weak (considered absolute).
2020-01-10 07:53:52 +08:00
call foo@PLT
Fix an issue that weak bit is dropped when there's a lazy object symbol. Previously, we accidentally dropped STB_WEAK bit from an undefined symbol if there is a lazy object symbol with the same name. That caused a compatibility issue with GNU gold. llvm-svn: 325316
2018-02-16 12:27:46 +08:00
.data
.quad foo