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

[William Blevins]

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> 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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> Scons-users at scons.org
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>
>
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