[Scons-users] Problems with SCons parallel build

[Evan Driscoll]

On 2014-03-21 16:50, Brady Johnson wrote:

> I commented out all the cd's from the Command() builders, and its

> still failing.

> 

> Something else that I just considered: I build several RPMs by

> calling os.system('rpmbuild...') directly instead of calling the

> SCons rpm builder. I wonder if rpmbuild changes directories,

> subsequently changing it for the SCons process. Anybody know if this

> could cause problems?


A child process can't change the directory of the parent (or, maybe 
there's a way if you try really hard and jump through hoops or 
something). That shouldn't be the cause.

One thought you could try: change env['ENV']['PATH'] so that 
x86_64-dx-linux-gnu-g++ is a script you write that outputs the current 
directory before running. Would at least tell you if this is a wild 
goose chase. :-)

Evan



> 

> Thanks,

> 

> Brady

> 

> On Fri, Mar 21, 2014 at 10:30 PM, Brady Johnson

> <bradyallenjohnson at gmail.com> wrote:

> 

>> The only cd in the entire project is in the aforementioned call to

>> Command(), chdir isn't used anywhere, neither via os nor via

>> builders.

>> 

>> Regards,

>> 

>> Brady

>> 

>> On Mar 21, 2014 10:26 PM, "Evan Driscoll" <driscoll at cs.wisc.edu>

>> wrote:

>> On 2014-03-21 16:04, Gary Oberbrunner wrote:

>> "cd" in a command is OK, since that runs in a subprocess.  But a

>> python chdir() would be very bad, since the whole process has only

>> one

>> current dir, so you're changing it for all threads if you do that.

>> 

>> Don't forget chdir arguments to builders too.

>> 

>> In other words, when using a parallel build:

>> 

>> 1) Command("cd blah && whatever") is OK

>> 2) AnyBuilder(..., chdir=1) or AnyBuilder(..., chdir='blah') is NOT

>> 3) os.chdir() from a Python function called by a builder is NOT

>> 

>> Evan

>> 

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