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

[Steve Robinson]

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
  +-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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