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[LLD] [COFF] Pick timestamps from the SOURCE_DATE_EPOCH variable #81326

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Merged
mstorsjo merged 2 commits into from
Feb 10, 2024
Merged

[LLD] [COFF] Pick timestamps from the SOURCE_DATE_EPOCH variable #81326

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[LLD] [COFF] Pick timestamps from the SOURCE_DATE_EPOCH variable
mstorsjo Feb 9, 2024
a0bd398
Test more cases
mstorsjo Feb 10, 2024
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10 changes: 9 additions & 1 deletion lld/COFF/Driver.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1825,7 +1825,15 @@ void LinkerDriver::linkerMain(ArrayRef<const char *> argsArr) {
}
} else {
config->repro = false;
config->timestamp = time(nullptr);
if (std::optional<std::string> epoch =
Process::GetEnv("SOURCE_DATE_EPOCH")) {
StringRef value(*epoch);
if (value.getAsInteger(0, config->timestamp))
fatal(Twine("invalid SOURCE_DATE_EPOCH timestamp: ") + value +
". Expected 32-bit integer");
} else {
config->timestamp = time(nullptr);
}
}

// Handle /alternatename
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2 changes: 2 additions & 0 deletions lld/test/COFF/timestamp.test
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Expand Up @@ -3,9 +3,11 @@ RUN: yaml2obj %p/Inputs/generic.yaml -o %t.obj
RUN: lld-link %t.obj /debug /Brepro /entry:main /nodefaultlib /out:%t.1.exe
RUN: lld-link %t.obj /debug /Brepro /entry:main /nodefaultlib /out:%t.2.exe
RUN: lld-link %t.obj /debug /timestamp:0 /entry:main /nodefaultlib /out:%t.3.exe
RUN: env SOURCE_DATE_EPOCH=0 lld-link %t.obj /debug /entry:main /nodefaultlib /out:%t.4.exe
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@MaskRay MaskRay Feb 10, 2024

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It'd be useful to test another value like clang/test/Preprocessor/SOURCE_DATE_EPOCH.c

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@mstorsjo mstorsjo Feb 10, 2024

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Thanks, I added more tests for more interesting cases.

What do you think of backporting this to 18.x? It’s not a bug fix per se, but a pretty safe improvement.

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@MaskRay MaskRay Feb 10, 2024

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LGTM for a backport to improve reproducibility!

https://reproducible-builds.org/

RUN: llvm-readobj --file-headers --coff-debug-directory %t.1.exe | FileCheck %s --check-prefix=HASH
RUN: llvm-readobj --file-headers --coff-debug-directory %t.2.exe | FileCheck %s --check-prefix=HASH
RUN: llvm-readobj --file-headers --coff-debug-directory %t.3.exe | FileCheck %s --check-prefix=ZERO
RUN: llvm-readobj --file-headers --coff-debug-directory %t.4.exe | FileCheck %s --check-prefix=ZERO

HASH: ImageFileHeader {
HASH: TimeDateStamp: [[STAMP:.*]]
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