[cfe-dev] ccc-analyzer sees the wiped out environment variables

[Gordon Keiser]

Hi (although I'm not Clang ;) ), 

The issue probably has to do with /bin/sh on Ubuntu not being Bash, but Dash instead.   Because of this, it doesn't support some extensions and can do weird things with the environment.   Try changing the shebang line in the script to #!/bin/bash and see if it helps.  

See this page for more details on why this is: 
https://wiki.ubuntu.com/DashAsBinSh

Cheers,
Gordon Keiser
Software Development Engineer
Arxan Technologies


> -----Original Message-----
> From: cfe-dev-bounces at cs.uiuc.edu [mailto:cfe-dev-bounces at cs.uiuc.edu]
> On Behalf Of Byoungyoung Lee
> Sent: Monday, September 24, 2012 10:26 PM
> To: cfe-dev at cs.uiuc.edu Developers
> Subject: [cfe-dev] ccc-analyzer sees the wiped out environment variables
> 
> Hello Clang,
> 
> While running scan-build, ccc-analyzer (line 45) sets $Clang from
> $ENV{'CLANG_CXX'} and checks its validity by whether its defined or not.
> Since $ENV{'CLANG_CXX'} happens to have an empty string on my machine
> (ubuntu 12.04, bash shell, perl v5.14), $Clang is not initialized properly, which
> eventually causes the scan-build to fail.
> Note that $ENV{'CLANG_CXX'} was set from scan-build properly, and I'm not
> sure why environment variables are wiped out.
> 
> Once I changed the ccc-analyzer as follows, it works fine. I'm wondering this is
> the platform dependent errors or I'm using the wrong options for scan-build
> (also attached below).
> 
> $ svn diff ccc-analyzer
> Index: ccc-analyzer
> ============================================================
> =======
> --- ccc-analyzer	(revision 164557)
> +++ ccc-analyzer	(working copy)
> @@ -43,7 +43,7 @@
>    if (!defined $Compiler) { $Compiler = $DefaultCXXCompiler; }
> 
>    $Clang = $ENV{'CLANG_CXX'};
> -  if (!defined $Clang) { $Clang = 'clang++'; }
> +  if (!defined $Clang || $Clang eq "") { $Clang = 'clang++'; }
>  }
>  else {
>    $Compiler = $ENV{'CCC_CC'};
> 
> 
> Here's my scripts for running scan-build.
> 
> ----
> #!/bin/sh
> 
> export CC="ccc-analyzer"
> export CXX="ccc-analyzer"
> 
> CLANG_PATH="--use-analyzer=/usr/local/bin/clang++"
> VERBOSE="-v -v"
> 
> echo "------------------------------------------"
> echo "[*] scan-build ../configure"
> echo "------------------------------------------"
> scan-build $CLANG_PATH ../configure --enable-debug --disable-optimize
> 
> echo "------------------------------------------"
> echo "[*] scan-build make"
> echo "------------------------------------------"
> scan-build $VERBOSE $CLANG_PATH make
> 
> Thanks,
> Byoungyoung
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