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1d96e4bc2d
The current default, build-id=fast, is only 8 bytes due to the usage of
64-bit XXH3. This is incompatible with RPM packaging tools which
requires >=16 bytes [1].
In Clang the ENABLE_LINKER_BUILD_ID define makes it pass --build-id
without a specific hash type. When also defaulting to LLD, this provides
a pretty broken default out-of-box.
Using XXH3 was a considerable performance advantage when build-id was
first implemented, because sha1 was really sha1 and rather slow.
Nowadays sha1 is just 160-bit BLAKE3 which is decently fast and not
cryptographically broken, so it should be a good default.
Note that the default remains "fast" for wasm because sha1 for wasm is
still real sha1.
Close https://github.com/llvm/llvm-project/issues/43483.
[1]:
b7d427728b/build/files.c (L1883)
101 lines
3.6 KiB
ArmAsm
101 lines
3.6 KiB
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
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# RUN: ld.lld --build-id %t -o %t2
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# RUN: llvm-readobj -S %t2 | FileCheck -check-prefix=ALIGN %s
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# RUN: ld.lld --build-id %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id %t -o %t2 --threads=1
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id=fast %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=FAST %s
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# RUN: ld.lld --build-id=md5 %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=MD5 %s
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# RUN: ld.lld --build-id=md5 %t -o %t2 --threads=1
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=MD5 %s
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# RUN: ld.lld --build-id=sha1 %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id=sha1 %t -o %t2 --threads=1
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id=tree %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id=tree %t -o %t2 --threads=1
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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# RUN: ld.lld --build-id=uuid %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=UUID %s
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# RUN: ld.lld --build-id=0x12345678 %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=HEX %s
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# RUN: ld.lld %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=NONE %s
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# RUN: ld.lld --build-id=md5 --build-id=none %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=NONE %s
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# RUN: ld.lld --build-id --build-id=none %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=NONE %s
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# RUN: ld.lld --build-id=none --build-id %t -o %t2
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# RUN: llvm-objdump -s %t2 | FileCheck --check-prefix=SHA1 %s
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.globl _start
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_start:
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nop
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.section .note.test, "a", @note
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.quad 42
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# ALIGN: Name: .note.gnu.build-id
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# ALIGN-NEXT: Type: SHT_NOTE
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# ALIGN-NEXT: Flags [
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# ALIGN-NEXT: SHF_ALLOC
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# ALIGN-NEXT: ]
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# ALIGN-NEXT: Address:
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# ALIGN-NEXT: Offset: [[_:0x[0-9A-Z]*(0|4|8|C)$]]
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# ALIGN-NEXT: Size:
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# ALIGN-NEXT: Link:
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# ALIGN-NEXT: Info:
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# ALIGN-NEXT: AddressAlignment: 4
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# FAST: Contents of section .note.test:
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# FAST: Contents of section .note.gnu.build-id:
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# FAST-NEXT: 04000000 08000000 03000000 474e5500 ............GNU.
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# FAST-NEXT: 630bc2f5 a2584763
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# MD5: Contents of section .note.gnu.build-id:
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# MD5-NEXT: 04000000 10000000 03000000 474e5500 ............GNU.
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# MD5-NEXT: dbf0bc13 b3ff11e9 fde6e17c 0304983c
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# SHA1: Contents of section .note.gnu.build-id:
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# SHA1-NEXT: 04000000 14000000 03000000 474e5500 ............GNU.
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# SHA1-NEXT: 1215775f d3b60050 70afd970 e8a10972
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# UUID: Contents of section .note.gnu.build-id:
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# UUID-NEXT: 04000000 10000000 03000000 474e5500 ............GNU.
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# HEX: Contents of section .note.gnu.build-id:
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# HEX-NEXT: 04000000 04000000 03000000 474e5500 ............GNU.
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# HEX-NEXT: 12345678
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# NONE-NOT: Contents of section .note.gnu.build-id:
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# RUN: ld.lld --build-id=sha1 -z separate-loadable-segments %t -o %t2
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# RUN: llvm-readelf -x .note.gnu.build-id %t2 | FileCheck --check-prefix=SEPARATE %s
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# SEPARATE: Hex dump of section '.note.gnu.build-id':
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# SEPARATE-NEXT: 0x00200198 04000000 14000000 03000000 474e5500
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# SEPARATE-NEXT: 0x002001a8 5cd067a4 2631c0fd 42029037 4b8e0938
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# RUN: ld.lld --build-id=sha1 --no-rosegment %t -o %t2
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# RUN: llvm-readelf -x .note.gnu.build-id %t2 | FileCheck --check-prefix=NORO %s
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# NORO: Hex dump of section '.note.gnu.build-id':
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# NORO-NEXT: 0x00200160 04000000 14000000 03000000 474e5500
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# NORO-NEXT: 0x00200170 a328cc99 45bfc3fc a9fc8615 37102f9d
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