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Date:      Mon, 20 Aug 2018 12:53:00 +0200
From:      Dimitry Andric <dim@FreeBSD.org>
To:        blubee blubeeme <gurenchan@gmail.com>
Cc:        FreeBSD Current <freebsd-current@freebsd.org>, Brooks Davis <brooks@FreeBSD.org>
Subject:   Re: building LLVM threads gets killed
Message-ID:  <ADEB4D33-A16C-427D-BE9B-1F25E591B0C7@FreeBSD.org>
In-Reply-To: <CALM2mE=BSCNjCMDuUSGv0Jwd4v%2BwK%2BCOsNH6Rndw8EGRrjLRBg@mail.gmail.com>
References:  <CALM2mE=BSCNjCMDuUSGv0Jwd4v%2BwK%2BCOsNH6Rndw8EGRrjLRBg@mail.gmail.com>

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On 20 Aug 2018, at 05:01, blubee blubeeme <gurenchan@gmail.com> wrote:
> 
> I am running current compiling LLVM60 and when it comes to linking
> basically all the processes on my computer gets killed; Chrome, Firefox and
> some of the LLVM threads as well
...
> llvm/build % ninja -j8
> [2408/2473] Building CXX object
> lib/Passes/CMakeFiles/LLVMPasses.dir/PassBuilder.cpp.o
> FAILED: lib/Passes/CMakeFiles/LLVMPasses.dir/PassBuilder.cpp.o
> /usr/bin/c++  -DGTEST_HAS_RTTI=0 -D_DEBUG -D__STDC_CONSTANT_MACROS
> -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Ilib/Passes -I../lib/Passes
> -Iinclude -I../include -isystem /usr/local/include -fPIC
> -fvisibility-inlines-hidden -Werror=date-time
> -Werror=unguarded-availability-new -std=c++11 -Wall -Wextra
> -Wno-unused-parameter -Wwrite-strings -Wcast-qual
> -Wmissing-field-initializers -pedantic -Wno-long-long
> -Wcovered-switch-default -Wnon-virtual-dtor -Wdelete-non-virtual-dtor
> -Wstring-conversion -fdiagnostics-color -g    -fno-exceptions -fno-rtti -MD
> -MT lib/Passes/CMakeFiles/LLVMPasses.dir/PassBuilder.cpp.o -MF
> lib/Passes/CMakeFiles/LLVMPasses.dir/PassBuilder.cpp.o.d -o
> lib/Passes/CMakeFiles/LLVMPasses.dir/PassBuilder.cpp.o -c
> ../lib/Passes/PassBuilder.cpp
> c++: error: unable to execute command: Killed

It is running out of RAM while running multiple parallel link jobs.  If
you are building using WITH_DEBUG, turn that off, it consumes large
amounts of memory.  If you must have debug info, try adding the
following flag to the CMake command line:

-D LLVM_PARALLEL_LINK_JOBS:STRING="1"

That will limit the amount of parallel link jobs to 1, even if you
specify -j 8 to gmake or ninja.

Brooks, it would not be a bad idea to always use this CMake flag in the
llvm ports. :)

-Dimitry


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