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POscons dependency problems in a hierarchical build with variant dirs
 

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  1. POscons dependency problems in a hierarchical build with variant dirs
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    <p>Im new to scons and am having problems with scons dependancies in a hierarchichal build with a variant directory.</p> <p>Im able to reproduce the problem in a reduced environment that consists of 2 subdirs under the SConscript directory (moduleA and moduleB) as follows:</p> <pre><code>. |-- SConstruct |-- file.conf |-- moduleA | |-- SConscript | `-- conf2cc `-- moduleB |-- SConscript `-- fileB.cc </code></pre> <p>Here is the flow of what needs to be done:</p> <ol> <li>moduleA executes a shell script: conf2cc, input: $projRootDir/file.conf, output: moduleA/$variantDir/source.cc</li> <li>moduleA compiles source.cc and creates moduleA/$variantDir/libmoduleA.a</li> <li>moduleB needs to copy moduleA/$variantDir/source.cc to moduleB/source.cc</li> <li>moduleB needs to compile moduleB/source.cc and moduleB/fileB.cc into its library libmoduleB.a</li> </ol> <p>Its entirely possible that Im doing several things wrong here. For example, I know Im not using $TARGET/$SOURCE in moduleA Command(), but thats on purpose, since the script needs the absolute path names, and scons doesnt remove the leading '#'</p> <p>The problem I have is the Command() builder in moduleB (step 3 above) never executes.</p> <p>Here are the SConstruct and SConscript files:</p> <p>Sconstruct</p> <pre><code>import os env = Environment() env['variantDir'] = 'linux' # for this example, just make variantDir = linux modules = ['moduleA', 'moduleB'] for dir in modules: SConscript( os.path.join(dir, 'SConscript'), variant_dir = os.path.join(dir, env['variantDir']), exports = ['env'], duplicate = 0) </code></pre> <p>moduleA/Sconscript</p> <pre><code>import os Import('env') scriptInput = '#file.conf' sourceFile = os.path.join('#moduleA', env['variantDir'], 'source.cc') conf2ccScript = File('#moduleA/conf2cc').abspath # The script needs abspaths for input and output, not the scons '#' prepended # the script syntax is: script &lt;inputFile&gt; &lt;outputFile&gt; cmd = '%s %s %s' % (conf2ccScript, File(scriptInput).abspath, File(sourceFile).abspath) # Generate source.cc file based on file.conf conf2ccNode = env.Command(target = sourceFile, source = scriptInput, action = cmd) libNode = env.Library(target = 'moduleA', source = sourceFile) env.Depends(libNode, conf2ccNode) </code></pre> <p>moduleB/Sconscript</p> <pre><code>import os Import('env') sourceFiles = ['fileB.cc', 'source.cc'] # Get the source.cc file externalSourceFile = os.path.join('#moduleA', env['variantDir'], 'source.cc') sourceTarget = os.path.join('#moduleB', 'source.cc') cmdNode = env.Command(target = sourceTarget, source = externalSourceFile, action = Copy('$TARGET', '$SOURCE')) libNode = env.Library(target = 'moduleB', source = sourceFiles) env.Depends(libNode, cmdNode) </code></pre> <p>Here is the output when I execute scons:</p> <p>Any help would be greatly appreciated!</p> <p>Brady</p> <pre><code>notroot@ubuntu:~/projects/sconsTest/sconsTestHierDeps$ scons scons: Reading SConscript files ... scons: done reading SConscript files. scons: Building targets ... /home/notroot/projects/sconsTest/sconsTestHierDeps/moduleA/conf2cc /home/notroot/projects/sconsTest/sconsTestHierDeps/file.conf /home/notroot/projects/sconsTest/sconsTestHierDeps/moduleA/linux/source.cc g++ -o moduleA/linux/source.o -c moduleA/linux/source.cc ar rc moduleA/linux/libmoduleA.a moduleA/linux/source.o ranlib moduleA/linux/libmoduleA.a g++ -o moduleB/linux/fileB.o -c moduleB/fileB.cc scons: *** [moduleB/linux/source.o] Source `moduleB/source.cc' not found, needed by target `moduleB/linux/source.o'. scons: building terminated because of errors. </code></pre>
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