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

Wed Sep 19 11:45:51 PDT 2018

The relevant documentation regarding the behavior of the VS generator is here:

https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html <https://cmake.org/cmake/help/latest/variable/CMAKE_BUILD_TYPE.html>

The relevant quote is:

"This variable is only meaningful to single-configuration generators (such as Makefile Generators and Ninja) i.e. those which choose a single configuration when CMake runs to generate a build tree as opposed to multi-configuration generators which offer selection of the build configuration within the generated build environment."

-Chris

> On Sep 19, 2018, at 7:06 AM, Dennis Luehring via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> thx for the help - debug and release version is built
> 
> Am 19.09.2018 um 13:21 schrieb Dennis Luehring via llvm-dev:
>> beware of small trap:
>> 
>> cmake --build . --config Release
>> 
>> works
>> 
>> cmake --config Release --build .
>> 
>> breaks after does not build - leaves build without errors
>> 
>> Am 19.09.2018 um 11:03 schrieb Dennis Luehring via llvm-dev:
>> >   >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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