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Disable unnecessary rebuilds on git changes #813

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vgvassilev merged 2 commits into from
Jul 26, 2017
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Disable unnecessary rebuilds on git changes #813

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db2e772
Disable rebuilding unnecessarily when git HEAD changes.
Teemperor Jul 26, 2017
3bd83ce
Fix that LLVM currently rebuilds unnecessarily when git HEAD changes.
Teemperor Jul 26, 2017
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Fix that LLVM currently rebuilds unnecessarily when git HEAD changes. 
This removes the file dependency between LLVM and the git HEAD file,
which currently causes that we rebuild LLVM/Cling/Dictionaries
once someone does anything meaningful in git.
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Teemperor committed Jul 26, 2017
commit 3bd83cecd05cd3e41a24cf2b21a499ddccaaea61
7 changes: 7 additions & 0 deletions interpreter/llvm/src/include/llvm/Support/CMakeLists.txt
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Expand Up @@ -38,6 +38,13 @@ set(version_inc "${CMAKE_CURRENT_BINARY_DIR}/VCSRevision.h")

set(get_svn_script "${LLVM_CMAKE_PATH}/GenerateVersionFromCVS.cmake")

# Ugly hack to prevent rebuilding LLVM whenever the git HEAD timestamp
# changes. This is properly solved by setting LLVM_APPEND_VC_REV to OFF
# but this only really works once this review is included in our LLVM
# version: https://reviews.llvm.org/D35377
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@vgvassilev vgvassilev Jul 26, 2017

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Can't we backport it?

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@Teemperor Teemperor Jul 26, 2017

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It's multiple commits that refactored this thing, D35377 is only the one that actually makes it fully work as intended (we don't even have the setting variable he's using in our CMake code yet), and backporting bigger pieces of CMake code isn't a lot of fun.

It's also just until the next LLVM upgrade where the other commit fixes this properly and we can drop this hack.

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@vgvassilev vgvassilev Jul 26, 2017

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Sounds reasonable to me, thanks for explaining.

# Once our LLVM version includes this review, this code can be removed
# as we properly set LLVM_APPEND_VC_REV in interpreter/CMakeLists.txt.
set(llvm_vc)
if(DEFINED llvm_vc)
# Create custom target to generate the VC revision include.
add_custom_command(OUTPUT "${version_inc}"
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