I have a simple .cpp file that depends on jsoncpp. As a part of my build process I want Scons to untar jsoncpp (if it isn't already) and build it (if it isn't already) before attempting to compile app.cpp since app.cpp depends on some .h files that are zipped up inside of jsoncpp.tar.gz.
This is what I've tried so far:
However, Scons never prints 'Extracted jsoncpp'.. it always attempts to compile app.cpp and then promptly fails.
If I were using make, I could simply do something like:
And the order would be guaranteed.
You should take a look at the UnTarBuilder, as a means to extract a tarfile and have all of the extracted files be properly inserted into the dependency tree. But the following will get what you have working.
You want to avoid explicit dependencies, if possible. One of the many joys of SCons is letting it take care of your dependencies for you. So just list the source file you are depending on as one of the targets of your untar command builder.
To test this I created a tar file called jsoncpp.tar.gz containing just one file, app.cpp, with the following contents.
SCons is a build system. It takes a bunch of input files and run tools on them to produce output. SCons is written in pure Python, works the same way on Linux, Windows and OS X, and may be run without installation. SCons' SConstruct files are Python scripts with built-in commands that create a build tree. SCons - a software construction tool Welcome to the SCons development tree. The real purpose of this tree is to package SCons for production distribution in a variety of formats, not just to hack SCons code.
And updated your SConstruct to the following.
'scons' is not recognized as an internal or external command, operable program or batch file. Because of that, I tried editing the user and system path variable to include scons under the directory 'C: Users dwayn AppData Local Programs Python38 Lib site-packages scons ', but I get the same error. Install python, including pip and tick 'add python to PATH'. Run pip install scons in command line. This installs Scons, but it won't be available from command line yet. If you run pip show scons it'll show you where the Scons code actually is (for me it's c:usersusernameappdataroamingpythonpython38site-packages - but this is not what.
Text editor for java mac. Because you list the required source file you depend on as a target of your command builder, it will handle the dependencies for you.
And when you run, you will see the following.
The reason why your code does not work is because you are listing jsoncpp as the target of your untar command builder. Which is not a file that compiling app.cpp will depend on, even if you list that action as an explicit dependency.
While this doesn't exactly answer your question, I hope it provides a solution to what you are trying to accomplish.
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python,caching,scons,build-system,hardlink
Sconce
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python,scons
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java,android,ant,scons
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python,regex,import,d,scons
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