Chances for llvm / clang update?

Brian Inglis
Thu Apr 22 15:45:06 GMT 2021

On 2021-04-22 09:08, Brian Inglis wrote:
> On 2021-04-22 02:31, Andreas Heckel via Cygwin wrote:
>> Is there a chance for an "official" update of clang / llvm. Currently I 
> see v8 here on Cygwin while llvm is now at v12.
>> I had tried to build v12 in Cygwin by simply running along the instructions on 
>> the llvm page. But I failed at a number of options / packages in the past and 
>> only got clang and a few tools like clang-format to run under Cygwin. I 
>> apologise, but I really have no clue about building anything properly for 
>> Cygwin (yet).
> Install the latest llvm and clang *source* packages; and
> binary packages: cygport, which pulls in all the usual tools, but also add 
> cmake, gnupg2, ninja, cygwin-devel, libc++-devel, libc++abi-devel, 
> libedit-devel, libffi-devel, libllvm-devel, libncurses-devel, libpolly-devel, 
> libunwind-devel, libxml2-devel, zlib-devel, python3-devel, python3-recommonmark, 
> python3-setuptools, and python3-sphinx;
> change to the llvm source directory containing the llvm.cygport file;
> edit llvm.cygport, and bump the major version 1 at a time, e.g. 9.0.1, 10.0.1 
> 11.1.0, 12.0.0, including libllvm{9,10,11,12}, libpolly{9,10,11,12}, and save;
> then run:
>      $ cygport llvm.cygport download all check
> Pay attention to:
> any warning or error messages about required packages missing, some of which may 
> be lib...-devel, which you have to install before retrying the build; and
> build errors, which you have to resolve.
> After a successful build, you will have binary and source tar and hint files 
> under llvm-#-1.*86*/dist/llvm/ which you may install on your system using:
>      $ tar -xv -C / -f llvm-#-1.*86*/dist/llvm/llvm-#-1.tar.xz
> similarly for prerequisite dependencies and corequisite package tars under:
>      $ ls llvm-#-1.*86*/dist/llvm/{,*/}*-#-1.tar.xz
> as packages are built under a virtual root directory, which you can see under 
> llvm-#-1.*86*/inst/...
> Then repeat the process for clang source updates using each recently built and installed llvm.

You can also browse the cygport and patch files required at:

and you can git clone those projects from the listed URLs as a basis for 
building and upgrading: llvm cygport has already been updated there for 9.0.1.

Once you have installed cygport you can browse the local docs using:

	$ cygstart /usr/share/doc/cygport/html/manual/index.html

for more information on what's going on.

Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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