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<div class="">On Oct 21, 2019, at 14:16, Mehdi AMINI <<a href="mailto:joker.eph@gmail.com" class="">joker.eph@gmail.com</a>> wrote:</div>


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<div dir="ltr" class="gmail_attr">On Sun, Oct 20, 2019 at 4:21 PM Jie Zhou via llvm-dev <<a href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>> wrote:<br class="">


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<div style="word-wrap: break-word; line-break: after-white-space;" class="">Dear all,


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<div class="">I’m developing Clang&LLVM on MacOS Catalina 10.15.</div>


<div class="">Now every time I "<font face="Arial" class="">make clang"</font>, the building systems rebuilds</div>


<div class="">all the .inc files generated by cmake,</div>


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<div class="">Are you saying that if you re-run `make clang` immediately after the first invocation complete you see these files rebuilt? You're not changing anything in the repo or running `git pull` (or equivalent)? This would really not be expected.</div>


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Yes the tablegen files get recompiled immediately after I run a `make clang`. I checked on a Ubuntu and did not see the same behavior.</div>


<div>But luckily Joan's suggestion works: the -DLLVM_OPTIMIZED_TABLEGEN for cmake will do the trick.</div>


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<div>- Jie<br class="">


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<div class="">Mehdi</div>


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<div class="">which essentially</div>


<div class="">rebuilds all the tablegen files in llvm, although I did not</div>


<div class="">change any of the tablegen files. The building is unnecessary</div>


<div class="">and slow, especially when it builds the X86GenSubtargetInfo.inc.</div>


<div class="">Is there a way to prevent cmake generating Makefiles that</div>


<div class="">rebuilds all the tablegen files?</div>


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<div class="">Here is my command line to run cmake for generating Makefiles:</div>


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<div class="">cmake -G “Unix Makefiles” -DLLVM_TARGETS_TO_BUILD=“X86" -DCMAKE_BUILD_TYPE=Debug $(LLVM_SRC)</div>


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<div class="">The cmake version is 3.13.4. And I did not experience the same behavior on a Linux.</div>


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<div class="">Thanks,</div>


<div class="">- Jie</div>


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