[llvm-bugs] [Bug 35349] New: alpha.unix.Chroot is unusable with chroot() error checking

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35349

            Bug ID: 35349
           Summary: alpha.unix.Chroot is unusable with chroot() error
                    checking
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Static Analyzer
          Assignee: dcoughlin at apple.com
          Reporter: tss at iki.fi
                CC: llvm-bugs at lists.llvm.org

Created attachment 19444
  --> https://bugs.llvm.org/attachment.cgi?id=19444&action=edit
test program

It seems to be impossible to check for chroot() return value and handle it,
without alpha.unix.Chroot complaining: warning: No call of chdir("/")
immediately after chroot

I even attempted to use chdir("/") in the error handling code path just after
saving errno, but even that fails. See attached test.c program.

scan-build -enable-checker alpha.unix gcc test.c -o test
test2.c:7:20: warning: No call of chdir("/") immediately after chroot
                int orig_errno = errno;
                                 ^~~~~

I guess I could just trust that chdir("/") doesn't change the errno, but that
seems a bit fragile.

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