[llvm-bugs] [Bug 26220] New: ccc-analyzer does not accept CCC_CC/CCC_CXX with quotes

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26220

            Bug ID: 26220
           Summary: ccc-analyzer does not accept CCC_CC/CCC_CXX with
                    quotes
           Product: clang
           Version: 3.7
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: simon.kagstrom at netinsight.net
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

We're using ccache to speed up compilation, so in our system, CC is set to
"ccache gcc-4.9" (basically). We want and need to run scan-build with the same
underlying compiler, so we run it with the CCC_CC="$(CC)" environment variable.

However, ccc-analyzer doesn't accept this, but falls back to the default
compiler instead. An easy way to reproduce this is to do

 $ touch /tmp/a.c      # Empty C source
 $ CCC_CC=ls ccc-analyzer /tmp/a.c
 /tmp/a.c
 $ CCC_CC="true ; ls" ccc-analyzer /tmp/a.c
 /usr/bin/ld: [...]: relocation 0 has invalid symbol index 11

so in the second case, ccc-analyzer ignores CCC_CC and falls back to gcc. My
Perl-knowledge is extremely limited, but I believe this is caused by
ccc-analyzer verifying that the compiler exists in the path:

 # Search in the PATH if the compiler exists
 sub SearchInPath {
    my $file = shift;
    foreach my $dir (split (':', $ENV{PATH})) {
        if (-x "$dir/$file") {
            return 1;
        }
    }
    return 0;
 }
 [...]

  $Compiler = $ENV{'CCC_CC'};
  if (!defined $Compiler || (! -x $Compiler && ! SearchInPath($Compiler))) {
$Compiler = $DefaultCCompiler; }


I tested this with clang-3.7, but the latest ccc-analyzer seems to have the
same construct. Obviously, the same is true for the handling of CCC_CXX.

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