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llvm/test/MC/COFF/timestamp.s

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[MC, COFF] Support link /incremental conditionally Today, we always take into account the possibility that object files produced by MC may be consumed by an incremental linker. This results in us initialing fields which vary with time (TimeDateStamp) which harms hermetic builds (e.g. verifying a self-host went well) and produces sub-optimal code because we cannot assume anything about the relative position of functions within a section (call sites can get redirected through incremental linker thunks). Let's provide an MCTargetOption which controls this behavior so that we can disable this functionality if we know a-priori that the build will not rely on /incremental. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256203 91177308-0d34-0410-b5e6-96231b3b80d8
2015-12-21 22:09:27 +00:00
// RUN: llvm-mc -filetype=obj -triple i686-pc-win32 -incremental-linker-compatible %s -o - | llvm-readobj -h | FileCheck %s
Produce deterministic coff files. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196341 91177308-0d34-0410-b5e6-96231b3b80d8
2013-12-04 02:02:55 +00:00
// CHECK: ImageFileHeader {
[MC, COFF] Unbreak support for COFF timestamps Support for COFF timestamps was unintentionally broken in r246905 when it was conditionally available depending on whether or not LLVM was configured with LLVM_ENABLE_TIMESTAMPS. However, Config/config.h was never included which essentially broke the feature. Due to lax testing, the breakage was never identified until we observed strange failures during incremental links of Chromium. This issue is resolved by simply including Config/config.h in WinCOFFObjectWriter and teaching lit that the MC/COFF/timestamp.s test is conditionally supported depending on LLVM_ENABLE_TIMESTAMPS. With this in place, we can strengthen the test to ensure that it will not accidentally get broken in the future. This fixes PR25891. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@256137 91177308-0d34-0410-b5e6-96231b3b80d8
2015-12-21 08:03:07 +00:00
// CHECK: TimeDateStamp:
// CHECK-NOT: 1970-01-01 00:00:00 (0x0)
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