[bug #40503] Shebang detection is flawed

[Mike Hommey]

URL:
  <http://savannah.gnu.org/bugs/?40503>

                 Summary: Shebang detection is flawed
                 Project: make
            Submitted by: glandium
            Submitted on: Thu 07 Nov 2013 01:01:58 AM GMT
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: SCM
        Operating System: MS Windows
           Fixed Release: None
           Triage Status: None

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Details:

According to
http://git.savannah.gnu.org/cgit/make.git/tree/w32/subproc/sub_proc.c?id=9d58570c77240fed53d1f88217877f8e778f4bb2#n622

shebang detection just uses the file base name and assumes whatever in $PATH
has that name will work.

Except that doesn't work when you deliberately use a path that is not in $PATH
for the shebang. We're hitting this in the Firefox build system, where a
script has a shebang pointing to a virtualenv python executable, and the
script doesn't work with the system python.

I think the shebang executable detection should use the same logic (or kind
of) as the logic for recipes.

Ironically, make fails to get the file base name when the path uses back
slashes instead of forward slashes, which makes shebang with back slashes have
a different behavior.




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