[Scons-users] Parallel builds sometimes fails

[Bill Deegan]

You should not have to explicitly tell SCons that a source file depends on
a header...

On Fri, May 25, 2018 at 11:47 AM, Hua Yanghao <huayanghao at gmail.com> wrote:

> I am also using generated header files, which in turn is
> unconditionally included by all C files.
> The way I use is to first collect the entire C objects and mark an
> explicit dependency: env.Depends(obj_list, depend_list).
>
> However you need to make the scons build aware of the generated header
> files, which in my case is generated by a customer scons builder.
>
> And my builds worked fine with parallel builds.
>
> On Fri, May 25, 2018 at 4:48 PM, mingqian Han <mq_han at hotmail.com> wrote:
> > Hi all,
> >
> >      I am trying to implement a building infrastructure based on Scons.
> > Currently it works nicely when doing a non-parallel build (-j1)
> >      However when I run a parallel build, sometimes it fails.
> >      The build is mostly C source files, and some of them include a
> specific
> > header file, for example, #include "myheader.h"
> >       But myheader.h is a generated file from some configuration files. I
> > have created a custom SCons builder, put under scons_tools, and it
> generates
> > this file when Scons runs.
> >       However in parallel build, sometimes some source files get to
> compile
> > before myheader.h is generated, which results in error: myheader.h not
> > found.
> >       And sometimes, when my custom SCons builder gets running, it
> reports
> > error, saying that it is unable to access this file because other
> process is
> > using it. In such case, myheader.h is only partially generated.
> >       I know SCons reads all the SConscripts first then decides the
> order of
> > building itself. So is there any way to make the parallel build success?
> >       Thanks all.
> >
> > Regards,
> >
> > Rafael
> >
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> >
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