[Scons-users] using variant_dir but strip out the variant_dir from source files

[Jason Kenny]

Normally SCons will have the compiler output the target data into the Variant directory. In certain cases, the compiler doesn't allow control of where the output happens. SCons has a feature to change the current directory for you. However, this feature as it is, breaks the -j based builds. I work around this in my builds by changing the action to "cd  <variant directory> ; <compiler command>". This seems to solve the issue of compilers messing up stuff on disk for me at least.
-Jason
________________________________
From: Scons-users <scons-users-bounces at scons.org> on behalf of Hua Yanghao <huayanghao at gmail.com>
Sent: Wednesday, October 17, 2018 2:55 PM
To: SCons users mailing list
Subject: [Scons-users] using variant_dir but strip out the variant_dir from source files

Dear Scons User,
I am having maybe an odd request. The background is there are some
compilers out there produces all kinds of output in your current
directory which you do not have control. I wanted to combine the
variant_dir feature plus the chdir kw arguments to builders, to be
able to invoke those compilers directly inside the variant_dir. And I
still want to keep the source duplication in the variant_dir as it
will be a snapshot of only the used files for a particular built out
of thousands of irrelevant files. As a side effect now the source
files are all prefixed with the variant_dir which becomes "invalid"
because the compiler is already invoked in the variant_dir instead of
the top level directory.

Is there a way (e.g. a special env variable) already that when I write
my builders instead of "$COMPILER $SOURCE", I can use something like
"$COMPILER $ORIGINAL_SOURCE"? Or do I have to wrap around the
$COMPILER with another command such that I can do things like
"$COMPILER_WRAPPED $VARIANT_DIR $SOURCE"? I know the second one
definitely can work but wondering if there are better ways already in
scons.

Best Regards,
Yanghao
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