errors building llvm from sources using ninja

[packtpublishing]

errors building llvm from sources using ninja

[tesivo]

Hello,
In Chapter 1, in the prerequisites for Windows section, it says right after the Chocolatey command to run all commands through the "x64 Native Tools Command Prompt for VS 2019". If you are already doing this start Visual Studio Installer and edit your visual studio installation by adding "Desktop development with C++".
This is if you install Visual Studio Community.

[PavelKotov1]

Ciao, Lorenzo!
thanks for your input!
unfortunately, i am not using visual studio to build llvm.
I am using NINJA.
So, are you suggesting to do what i did from withing x64 Native Tools Command Prompt for VS 2019?

[tesivo]

You' re welcome!
You don't need to use the Visual Studio generator, you can also use Ninja as a generator, but if you use the Visual Studio command prompt it will find what you need.

So yes, send your commands with x64 Native Tools Command Prompt for VS 2019

[redstar]

Hi Pavel! Your build fails in the very first file. It seems that the std::errc enumeration is missing. This indicates that your libc++ version is too old. LLVM requires a C++14 compatible library (std::errc was introduces with C++11, so the error is a bit surprising). From the error message, I also see that you are using MinGW. Honestly, I do not know how well LLVM works when compiled with MinGW. While MinGW itself provides the required level of gcc/g++ compiler, the support for this platform is experimental (at least to my knowledge). Regards, Kai From: PavelKotov1 ***@***.*** Sent: Saturday, 16 October 2021 17:30 To: PacktPublishing/Learn-LLVM-12 Cc: Subscribed Subject: [PacktPublishing/Learn-LLVM-12] errors building llvm from sources using ninja (#6) Hello, dear friends! I am trying to build from sources and install llvm on windows 10. Installed all the prerequisites first. Then: git clone https://github.com/llvm/llvm-project.git cd llvm-project mkdir build cd build cmake –G Ninja -DLLVM_ENABLE_PROJECTS=clang ../llvm ninja The output of the last command is as follows: [1/4233] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/CachePruning.cpp.obj FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/CachePruning.cpp.obj C:\MinGW\bin\c++.exe -DGTEST_HAS_RTTI=0 -D_DEBUG -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Ilib/Support -IC:/llvm-project/llvm/lib/Support -Iinclude -IC:/llvm-project/llvm/include -isystem "C:/Program Files (x86)/GnuWin32/include" -Wa,-mbig-obj -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wno-maybe-uninitialized -Wdelete-non-virtual-dtor -Wno-comment -Wmisleading-indentation -g -std=c++14 -fno-exceptions -fno-rtti -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/CachePruning.cpp.obj -MF lib\Support\CMakeFiles\LLVMSupport.dir\CachePruning.cpp.obj.d -o lib/Support/CMakeFiles/LLVMSupport.dir/CachePruning.cpp.obj -c C:/llvm-project/llvm/lib/Support/CachePruning.cpp In file included from C:/llvm-project/llvm/lib/Support/CachePruning.cpp:16:0: C:/llvm-project/llvm/include/llvm/Support/Errc.h:65:23: error: 'not_supported' is not a member of 'std::errc' not_supported = int(std::errc::not_supported), ^~~ [2/4233] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/ARMAttributeParser.cpp.obj FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/ARMAttributeParser.cpp.obj C:\MinGW\bin\c++.exe -DGTEST_HAS_RTTI=0 -D_DEBUG -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Ilib/Support -IC:/llvm-project/llvm/lib/Support -Iinclude -IC:/llvm-project/llvm/include -isystem "C:/Program Files (x86)/GnuWin32/include" -Wa,-mbig-obj -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wno-maybe-uninitialized -Wdelete-non-virtual-dtor -Wno-comment -Wmisleading-indentation -g -std=c++14 -fno-exceptions -fno-rtti -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/ARMAttributeParser.cpp.obj -MF lib\Support\CMakeFiles\LLVMSupport.dir\ARMAttributeParser.cpp.obj.d -o lib/Support/CMakeFiles/LLVMSupport.dir/ARMAttributeParser.cpp.obj -c C:/llvm-project/llvm/lib/Support/ARMAttributeParser.cpp In file included from C:/llvm-project/llvm/lib/Support/ARMAttributeParser.cpp:12:0: C:/llvm-project/llvm/include/llvm/Support/Errc.h:65:23: error: 'not_supported' is not a member of 'std::errc' not_supported = int(std::errc::not_supported), ^~~ [3/4233] Building CXX object lib/Support/CMakeFiles/LLVMSupport.dir/CodeGenCoverage.cpp.obj FAILED: lib/Support/CMakeFiles/LLVMSupport.dir/CodeGenCoverage.cpp.obj C:\MinGW\bin\c++.exe -DGTEST_HAS_RTTI=0 -D_DEBUG -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -Ilib/Support -IC:/llvm-project/llvm/lib/Support -Iinclude -IC:/llvm-project/llvm/include -isystem "C:/Program Files (x86)/GnuWin32/include" -Wa,-mbig-obj -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wno-maybe-uninitialized -Wdelete-non-virtual-dtor -Wno-comment -Wmisleading-indentation -g -std=c++14 -fno-exceptions -fno-rtti -MD -MT lib/Support/CMakeFiles/LLVMSupport.dir/CodeGenCoverage.cpp.obj -MF lib\Support\CMakeFiles\LLVMSupport.dir\CodeGenCoverage.cpp.obj.d -o lib/Support/CMakeFiles/LLVMSupport.dir/CodeGenCoverage.cpp.obj -c C:/llvm-project/llvm/lib/Support/CodeGenCoverage.cpp In file included from C:/llvm-project/llvm/lib/Support/CodeGenCoverage.cpp:17:0: C:/llvm-project/llvm/include/llvm/Support/Mutex.h:29:12: error: 'recursive_mutex' in namespace 'std' does not name a type std::recursive_mutex impl; ^~~~~~~~~~~~~~~ C:/llvm-project/llvm/include/llvm/Support/Mutex.h: In member function 'bool llvm::sys::SmartMutex<mt_only>::lock()': C:/llvm-project/llvm/include/llvm/Support/Mutex.h:35:11: error: 'impl' was not declared in this scope impl.lock(); ^~~~ C:/llvm-project/llvm/include/llvm/Support/Mutex.h: In member function 'bool llvm::sys::SmartMutex<mt_only>::unlock()': C:/llvm-project/llvm/include/llvm/Support/Mutex.h:48:11: error: 'impl' was not declared in this scope impl.unlock(); ^~~~ C:/llvm-project/llvm/include/llvm/Support/Mutex.h: In member function 'bool llvm::sys::SmartMutex<mt_only>::try_lock()': C:/llvm-project/llvm/include/llvm/Support/Mutex.h:62:18: error: 'impl' was not declared in this scope return impl.try_lock(); ^~~~ ninja: build stopped: subcommand failed. Could you please help me? Thanks in advance! — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#6> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAGKDU7A4W7CXXUP6653JVLUHHVEPANCNFSM5GEBQAEA> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> . Image removed by sender.

[PavelKotov1]

hello, dear friends Lorenzo and Kai!
I am a bit late with my response because running ninja command took close to 50 hours on my modest laptop. So i was waiting to see if everything works.
Now, everything worked this time when i ran all commands through the "x64 Native Tools Command Prompt for VS 2019", as Lorenzo suggested.
I would close the issue now, but before i do that i have one more question.
In his comment Kia says:

I also see that you are using MinGW

To be quite honest, i did not do anything to make ninja use MinGW. Does ninja use it by defaul? How could I make ninja use any other available toolset? And what is the default behaviour?

Thanks again for your help! And please explain the toolset issue!