[cfe-dev] Building Clang on Windows

Fábio Picchi via cfe-dev cfe-dev at lists.llvm.org
Sat Oct 6 04:31:10 PDT 2018


My path to cl.exe
C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.14.26428\bin\HostX64\x64\CL.exe

> If it's running out of heap space on the amd64 native toolchain, it's a
bug in the compiler because this should not even be theoretically possible
I will try to update visual studio to see if the problem is solved.

> we can build with ninja
I will also try to build with ninja :) I had never heard about the project!




On Thu, Oct 4, 2018 at 11:44 AM Zachary Turner <zturner at google.com> wrote:

> compiler out of heap space is quite interesting.  I can understand the
> linker running out of heap space, but the compiler is quite unusual.  The
> first thing I would do is check to make sure you are using the 64-bit host
> toolchain.  You said you passed -Thost=x64, but let's make sure there's not
> a bug in the Visual Studio generator or something.
>
> Turn on Diagnostic output (Tools -> Options -> Projects & Solutions ->
> Build and Run -> MSBuild Project Output Verbosity -> Diagnostic) and
> rebuild.  Then rebuild and wait for the error to happen.  When it does,
> find the error in the log and scroll up looking for "cl.exe" (or do a
> reverse find from the end).
>
> Look at the path to cl.exe.  Is it the one from the amd64 directory or the
> x86 directory?
>
> If it's running out of heap space on the amd64 native toolchain, it's a
> bug in the compiler because this should not even be theoretically
> possible.  If it's running out of heap space on the x86 toolchain, then the
> question is why isn't it using the correct toolchain.
>
> FWIW, I kind of wish we would stop supporting building with the VS
> generator.  MSBuild doesn't really scale well, and now that VS has support
> for opening CMake projects directly, and we can build with ninja, I don't
> see a strong use case for building with MSBuild anymore given how many
> problems it causes.
>
> On Thu, Oct 4, 2018 at 6:24 AM Fábio Picchi via cfe-dev <
> cfe-dev at lists.llvm.org> wrote:
>
>> Updates:
>> > Are you building debug or release? If debug, try building release.
>> I tried and got the same error.
>>
>> I noticed my *build target* was *Win32* even though I passed the option
>> -Thost=x64 to cmake. I followed the new instructions to regenerate the
>> solution using:
>> cmake -G "Visual Studio 15 2017" -A x64 -Thost=x64 ..\llvm
>>
>> Now the build target is displayed as *x64*. I tried to build it in Debug
>> mode and still got the dreaded error:
>> C1060: compiler is out of heap space
>>
>> I couldn't check the log errors in detail because I had to leave for work
>> but I'll post more updates in the evening.
>>
>> I will try to do some research on the weekend but it would be great if
>> someone could better explain the out of heap space error. How can the
>> linker run out of memory just by linking binaries? Why is this process so
>> memory intensive? Furthermore, why does it matter if I am targeting x86 or
>> x64? I understand the pointers double in size but that would mean more
>> memory usage for the x64 target, not the x86.
>>
>> Thank you very much for the help!
>>
>> On Thu, Oct 4, 2018 at 4:19 AM Dennis Luehring via cfe-dev <
>> cfe-dev at lists.llvm.org> wrote:
>>
>>> Am 03.10.2018 um 23:29 schrieb Reid Kleckner via cfe-dev:
>>> > Can anyone who actually knows answer Shaob's question? He asked "Does
>>> the
>>> > Win64 generator automatically imply -Thost=x64?
>>>
>>>
>>> CMake gives a warning if not using -Thost=x64 with VS2017 generator
>>> Win64 that i could happen that the x86 tool chain is used - so i think
>>> its not automatically implied
>>>
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