[llvm-dev] CMake build of LLVM/clang with -DCMAKE_BUILD_TYPE=Release does not create release versions?

[Bruce Hoult via llvm-dev]

With debug builds and gnu ld some of the links take up to 9 or 10 GB of
RAM, so with only 8 GB you'd want -DLLVM_PARALLEL_LINK_JOBS=1 and even then
still be swapping.

The OS X linker uses far less RAM, and I'm told gold is better too, so
maybe there's also no problem on Windows. Or not as much of one. I think
I'd use -DLLVM_PARALLEL_LINK_JOBS=1 *anyway* with only 8 GB system RAM.

On Wed, Sep 19, 2018 at 2:38 AM, Dennis Luehring via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> >are you setting the optimized tablegen option?
>
> LLVM_OPTIMIZED_TABLEGEN is not active - i will try that
>
> >In addition, make sure you have plenty of memory
>
> i've got only Intel Core 2 Quad CPU Q8300/2.50Ghz and 8GB RAM for testing
> not much cpu power AND memory
>
>
>
>
> Am 19.09.2018 um 11:31 schrieb James Henderson:
>
>> Regarding the Debug build taking hours, are you setting the optimized
>> tablegen option? If you aren't the Debug build will take a very long
>> time. In addition, make sure you have plenty of memory, because the
>> link stages take up a lot on Debug builds.
>> On Wed, 19 Sep 2018 at 10:04, Dennis Luehring via llvm-dev
>> <llvm-dev at lists.llvm.org> wrote:
>> >
>> >  >because with that generator the CMAKE_BUILD_TYPE variable is ignored
>> >  >because it is a "multi-configuration target".
>> >
>> > thanks for the link, is that a bug in the CMake configuration (or better
>> > not getting any warning) or is there just documentation missing?
>> >
>> > so i can use --config Debug or --config Release and get the correct
>> > results - i hope that works the build takes hours
>> >
>> > strange is that -DCMAKE_BUILD_TYPE=Debug results in a different
>> > build-directory size compared to -DCMAKE_BUILD_TYPE=Release - so its not
>> > fully ignored?
>> >
>> > Am 19.09.2018 um 10:30 schrieb Boldizsar.Palotas at esa.int:
>> > > If I understand correctly, you need to set Release mode within the VS
>> IDE
>> > > because with that generator the CMAKE_BUILD_TYPE variable is ignored
>> > > because it is a "multi-configuration target".
>> > >
>> > > see
>> > > https://stackoverflow.com/questions/24460486/cmake-build-
>> type-not-being-used-in-cmakelists-txt
>> > >
>> > >
>> > >
>> > > From:   Dennis Luehring via llvm-dev <llvm-dev at lists.llvm.org>
>> > > To:     llvm-dev <llvm-dev at lists.llvm.org>
>> > > Date:   2018.09.19 06:11
>> > > Subject:        [llvm-dev] CMake build of LLVM/clang with
>> > > -DCMAKE_BUILD_TYPE=Release does not create release versions?
>> > > Sent by:        "llvm-dev" <llvm-dev-bounces at lists.llvm.org>
>> > >
>> > >
>> > >
>> > > my build environment:
>> > >
>> > > Win7 x64
>> > > VStudio 2017 Community Edition 15.8.4 (latest)
>> > > CMake 3.12.1 (x86)
>> > > git 2.19.0 (latest, x64)
>> > > Python 2.7.2 (x86)
>> > >
>> > > directory structure
>> > >
>> > > test
>> > >     llvm <-- git clone https://github.com/llvm-mirror/llvm
>> > >       tools
>> > >         clang <-- git clone https://github.com/llvm-mirror/clang
>> > >     llvm_build
>> > >
>> > > Debug build: clean build, llvm_build is deleted before
>> > >
>> > > llvm_build> cmake -Thost=x64 -G "Visual Studio 15 2017 Win64"
>> > > -DCMAKE_BUILD_TYPE=Debug -DLLVM_TARGETS_TO_BUILD=host
>> > > -DLLVM_BUILD_EXAMPLES=1 -DCLANG_BUILD_EXAMPLES=1
>> > > -DLLVM_INCLUDE_TESTS=OFF -DLLVM_INCLUDE_DOCS=OFF ..\llvm
>> > >
>> > > builds for hours, a few warning, no errors -> llvm_build is ~44GB
>> > >
>> > > i can find many working libs/exes(also examples) in
>> > > llvm_build\Debug\(lib|bin)
>> > >
>> > > then i tried to build release versions
>> > >
>> > > Release build: clean build, llvm_build is deleted before
>> > >
>> > > llvm_build> cmake -Thost=x64 -G "Visual Studio 15 2017 Win64"
>> > > -DCMAKE_BUILD_TYPE=Release -DLLVM_TARGETS_TO_BUILD=host
>> > > -DLLVM_BUILD_EXAMPLES=1 -DCLANG_BUILD_EXAMPLES=1
>> > > -DLLVM_INCLUDE_TESTS=OFF -DLLVM_INCLUDE_DOCS=OFF ..\llvm
>> > >
>> > > builds for hours, a few warning, no errors -> llvm_build is ~47GB (i
>> > > though Release would be smaller?)
>> > >
>> > > i can find many working libs/exes(also examples) in
>> > > llvm_build\Debug\(lib|bin) - the executables seems to be larger as in
>> > > "Debug"-Build?
>> > >
>> > > llvm-build\Release\bin just contains llvm-lit.py
>> > >
>> > > why is the debug folder populated and where i can find the Release
>> build
>> > > libs/exes?
>> > >
>> > >
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