I merged Victor’s patch with the current code and addressed most of the comments:

* restore re.escape()
* single "-l" + name argument
* copy with dict(os.environ)
* redirect GCC stderr=STDOUT
* changed tempfile cleanup to try / finally

I also added a test case.

I kept Victor’s behaviour of not raising OSError when the command is missing. I think this should be considered separately, and only changed for 3.6+, if at all. The buggy code was added in Issue 4861.

I only have Linux and GCC, but I briefly tested each platform-specific branch by hacking the “if” statements and creating mock crle, ldconfig, etc commands, so I am somewhat confident that everything is still working.