[Bug translator/25994] New: inproper order of PATH set cause wrong unexpected gcc used

[xuchunmei at linux dot alibaba.com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25994

            Bug ID: 25994
           Summary: inproper order of PATH set cause wrong unexpected gcc
                    used
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: translator
          Assignee: systemtap at sourceware dot org
          Reporter: xuchunmei at linux dot alibaba.com
  Target Milestone: ---

Created attachment 12541
  --> https://sourceware.org/bugzilla/attachment.cgi?id=12541&action=edit
add default "/usr/bin:/bin" after $PATH

My use case is like this, I install gcc-4.8.5 and devtoolset-9-gcc,
while I set the PATH by "source /opt/rh/devtoolset-9/enable" to use
gcc-9, but when I use "stap test.stap", I always get compile errors
for "gcc: error: unrecognized command line option
‘-fpatchable-function-entry=2’", the option
‘-fpatchable-function-entry=2’ is not supported by gcc-4.8.5 but
supported by gcc-9.
The stap process building always use gcc-4.8.5 from /usr/bin not from
the first path of PATH, such as /opt/rh/devtoolset-9/root/usr/bin/gcc.

As I think the default /usr/bin:/bin should be added after $PATH.

I add an attachment to fix it, please have a review.

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