[Scons-users] Parallel builds sometimes fails

[Hua Yanghao]

My header is not included in the C file, it is unconditional included by
“-include config.h”, how do you expect scons to know that? Parsing GCC
command line? :)

On Fri 25. May 2018 at 20:30, Bill Deegan <bill at baddogconsulting.com> wrote:

> 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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