[Flang-dev] Fortran compatible ninja; flang circular dependencies

Isuru Fernando isuruf at gmail.com
Fri Oct 12 12:59:25 EDT 2018


This was fixed in https://github.com/flang-compiler/flang/pull/464/files
among other things, but that PR has not been reviewed yet.

Isuru

On Fri, Oct 12, 2018 at 10:56 AM Stephen Scalpone <sscalpone at nvidia.com>
wrote:

> There’s an issue raised on github about the ieee_arithmetic.F95 build
> problem.  The the flang libraries are built twice, once as a shared library
> and once as a static library.  Both builds write their mod files to the
> same directory (‘include’), which is the problem.  Seems like we need to
> fix the build to use the -module option for compilations & then atomically
> copy the resulting .mod files into the include directory.  It’s probably a
> good idea to verify that the mod files are the same except for the time
> stamp.
>
>
>
> *From: *flang-dev <flang-dev-bounces at lists.flang-compiler.org> on behalf
> of blubee blubeeme <gurenchan at gmail.com>
> *Date: *Friday, October 12, 2018 at 1:03 AM
> *To: *"flang-dev at lists.flang-compiler.org" <
> flang-dev at lists.flang-compiler.org>
> *Subject: *Re: [Flang-dev] Fortran compatible ninja; flang circular
> dependencies
>
>
>
>
>
> On Fri, Oct 12, 2018 at 2:39 PM blubee blubeeme <gurenchan at gmail.com>
> wrote:
>
> There's a fork of ninja that supports fortran files:
> https://github.com/ninja-build/ninja
>
>
>
> When attempting to build you'll get an error:
>
> dupbuild=err
>
>
>
> You can change that from error to warning with
>
> -w dupbuild=warn
>
>
>
> but then the build still fails with circular dependencies:
>
> -- Build files have been written to:
> /wrkdirs/usr/ports/devel/pflang/work/.build
>
> ninja: warning: multiple rules generate include/iso_c_binding.mod. builds
> involving this target will not be correct; continuing anyway [-w
> dupbuild=warn]
>
> ninja: error: dependency cycle:
> runtime/flang/CMakeFiles/flang_shared.dir/Fortran.dd ->
> runtime/flang/CMakeFiles/flang_shared.dir/ieee_arithmetic.F95-pp.f95.ddi ->
> include/iso_c_binding.mod ->
> runtime/flang/CMakeFiles/flang_shared.dir/iso_c_bind.F95.o ->
> runtime/flang/CMakeFiles/flang_shared.dir/Fortran.dd
>
>
>
>
>
> It doesn't fail with Makefiles but ninja allows building a lot faster.
>
>
>
> Is this something that the flang developers are interested in taking a
> look at?
>
>
>
> Best
>
> I forgot to mention but building libpgmath with kitware ninja works just
> fine.
>
>
>
> Best
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