[Scons-users] Getting builds to work with the -j flag

[Plunket, Tom]

Decomposing the messages he’s getting results in:

LINK : fatal error LNK1181: cannot open input file 'add.lib'
   Creating library add.lib and object add.exp

So basically it’s trying to link the DLL’s export library just before it’s started to create it.

I have no problems with -j but I’m also not using SCons to build code. ;)

This does point out one annoyance I have with SCons which is that it interleaves output of the different processes. Has anyone started working on this, or is there an architecture proposal that I might look at and possibly assist? I still need to get into filename handling (files with ‘#’ characters aren’t supported for some reason and anything outside of latin-1 causes exceptions) but as I get more of a handle on building and testing SCons, addressing output interleaving would be one of my top priorities.

From: Scons-users [mailto:scons-users-bounces at scons.org] On Behalf Of William Blevins
Sent: Wednesday, February 17, 2016 4:53 PM
To: SCons users mailing list <scons-users at scons.org>
Subject: Re: [Scons-users] Getting builds to work with the -j flag

I'm not 100% sure, but it doesn't look like you are adding any CPPFLAGS in your example. Does the linker you are using require shared library specific flags? This isn't a case that you have both a static and shared library in the same directory?

On Wed, Feb 17, 2016 at 11:40 PM, Steve Robinson <steven.robinson at motorolasolutions.com<mailto:steven.robinson at motorolasolutions.com>> wrote:
Hello,

I'm trying to get the -j flag to work in an existing build system to speed up build times.  I'm running into errors like this:

c1xx : fatal error C1083: Cannot open source file: 'path\to\source\source.cpp': No such file or directory

general error c1010070: Failed to load and parse the manifest. The system cannot find the path specified.

midl\oleaut32.dll : error MIDL2020 : error generating type library : SaveAllChanges Failed : .\vc120.tlb (0x80070005)
LINK : fatal error LNK1240: failed to compile IDL content

I don't always have the same problem with the same files, but I can't get through a complete build without hitting one of these.  When I remove -j #, there are no errors.


Trying to simplify the problem I set up a simple SCons project that builds a library and builds a program that links to the library:

====== add.cpp ======
#include "add.h"

int addTwoNumbers(int number1, int number2)
{
return number1+number2;
}
===================


====== add.h ========
int __declspec(dllexport) addTwoNumbers(int number1, int number2);
===================


====== main.cpp =====
#include <stdio.h>
#include "add.h"

int main()
{
int number1 = 1;
int number2 = 2;
int answer = addTwoNumbers(number1, number2);
printf("%i + %i = %i", number1, number2, answer);
return 0;
}
===================

====== SConstruct ===
SharedLibrary('add', 'add.cpp')
Program('main', 'main.cpp', LIBS='add')
===================

I place all these files in a directory, open a command prompt, cd to the directory, and run:
scons -j 2

Usually, but not always, I get an error like this:
LINK : fatal error LNK1181: cannot open in p u tC rfeialtei n'ga dldi.blriabr'y
 add.lib and object add.exp
scons: *** [main.exe] Error 1181
scons: building terminated because of errors.

So this isn't the same linker error as what I get in the full build system, but it's a repeatable example of a build that works fine without the -j flag, but has an error with it.

Anyone have any ideas what's going on?

Here's my environment:
SCons 2.4.1
Windows 7 64-bit
Visual Studio 2013

This is just my third month with SCons and it's been really great to work with after a few years with CMake.  Hope I can help support this community once I get more experience under my belt!

-Steve

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