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

Thu Feb 18 13:01:18 EST 2016

Please list what you are expecting to see on the commandline for the call
that is failing.

Also, see a thought below.

On Thu, Feb 18, 2016 at 4:48 PM, Steve Robinson <
steven.robinson at motorolasolutions.com> wrote:

> Here's the dependency tree.  I don't see anything that jumps out as wrong
> to me.
>
> +-.
>   +-add.cpp
>   +-add.dll
>   | +-add.obj
>   | | +-add.cpp
>   | | +-add.h
>   | | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\cl.EXE
>   | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\link.EXE
>   +-add.exp
>   | +-add.obj
>   | | +-add.cpp
>   | | +-add.h
>   | | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\cl.EXE
>   | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\link.EXE
>   +-add.h
>   +-add.lib
>   | +-add.obj
>   | | +-add.cpp
>   | | +-add.h
>   | | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\cl.EXE
>   | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\link.EXE
>   +-add.obj
>   | +-add.cpp
>   | +-add.h
>   | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\cl.EXE
>   +-main.cpp
>   +-main.exe
>   | +-main.obj
>   | | +-main.cpp
>   | | +-add.h
>   | | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\cl.EXE
>   | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\link.EXE
>

Are you expecting main.exe to be linked into add.dll or add.lib? That
dependency does not exist.

>   +-main.obj
>   | +-main.cpp
>   | +-add.h
>   | +-C:\Program Files (x86)\Microsoft Visual Studio
> 12.0\VC\BIN\amd64\cl.EXE
>   +-SConstruct
>
> On Thu, Feb 18, 2016 at 8:43 AM, William Blevins <wblevins001 at gmail.com>
> wrote:
>
>> Did you look to see if the dependency tree is correct? Try "scons
>> --tree=all" for your simple case and give us your output.
>> On Feb 18, 2016 4:25 PM, "Steve Robinson" <
>> steven.robinson at motorolasolutions.com> wrote:
>>
>>> Thanks for all the responses!
>>>
>>>
>>> William Blevins: SCons seems to be adding required linker flags.  I
>>> figure that it wouldn't even build without the -j flag if that wasn't the
>>> case.  I am only building the shared library in this folder.
>>>
>>>
>>> Dominic Binks: I received the following suggestion through a direct
>>> email (he couldn't post to the list from his phone):
>>>
>>> libadd = SharedLibrary('add', 'add.cpp')
>>> Program('main', ['main.cpp', libadd])
>>>
>>> This more explicitly tells the program that it has to build the library
>>> before it can build the program.  I like how it reads, but it gives a link
>>> error even without -j:
>>> link /nologo /OUT:main.exe main.obj add.dll add.lib add.exp
>>> add.dll : fatal error LNK1107: invalid or corrupt file: cannot read at
>>> 0x2B8
>>>
>>> Looks like it tries to link the .dll and .exp files instead of just the
>>> .lib.
>>>
>>>
>>> Dirk Bächle: When I remove the __declspec, I get this error:
>>> LINK : fatal error LNK1181: cannot open input file 'add.lib'
>>> The add.lib file never gets created.
>>>
>>>
>>>
>>> The unfortunate thing about this example I'm providing is it doesn't get
>>> to the heart of the actual problem I'm having which is this error:
>>> c1xx : fatal error C1083: Cannot open source file:
>>> 'path\to\source\source.cpp': No such file or directory
>>>
>>> That source file isn't being generated it's just sitting there in the
>>> source tree.  Today, I'm going to try to reproduce that problem in a simple
>>> example.
>>>
>>> On Thu, Feb 18, 2016 at 12:11 AM, Dirk Bächle <tshortik at gmx.de> wrote:
>>>
>>>> Hi Steve,
>>>>
>>>> On 18.02.2016 00:40, Steve Robinson 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.
>>>>>
>>>>>
>>>> it's been a while since I did development under Windows (MFC stuff
>>>> mainly, with VS), but it looks to me as if the DLL declarations (and
>>>> possibly additional flags for either creating the DLL, or linking against
>>>> it) are they main culprit here:
>>>>
>>>> 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);
>>>>> ===================
>>>>>
>>>>>
>>>> Can you try to run the build without the "__declspec", and without any
>>>> additional flags...and then see what happens?
>>>>
>>>> [...]
>>>>> 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!
>>>>>
>>>>>
>>>> Thanks for the positive feedback, and we hope we can make you stay! ;)
>>>>
>>>> Best regards,
>>>>
>>>> Dirk
>>>>
>>>>
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