[scan-build] [Patch] Compiler call interceptor for Linux

[Aleksei Sidorin]

Hello,

This patch enables interception of compiler calls without replacement of 
environment variables. It uses strace (v.4.8) to compute root directory 
of processes (in case of chroot), working directory, process name and 
its environment variables and tries to guess some header directories. 
This approach works well with Android and some build systems like OBS 
(local build with osc client) and GBS (checked on Tizen). This behaviour 
can be enabled with --use-interceptor option. If this option is not 
specified, old behaviour is used (this patch was made to not break it).

Interceptor uses process pool to analyze multiple files at a time. Pool 
size can be specified with NUM_PROCESSES environment variable. Default 
pool size is a number of processors.

If we have a trace of build (that may be created with `strace -f -v -s 
1000000 -o $trace_file_name -e 
trace=vfork,fork,clone,execve,chdir,chroot -e signal= $build_cmd`), it 
can be passed via TRACE_FILE environment variable. This will not launch 
parallel build (analysis only). If option is not specified, temporary 
pipe is used, analyzer and compiler are executed in parallel.

-additional-arg option was also added to pass additional parameters to 
analyzer. Sometimes scan-build cannot determine all required parameters 
if some custom toolchain is used.

Interceptor was tested on Ubuntu 12.04 and 14.04 with strace 4.8. Strace 
v.4.6 is known to have some issues with interception of gcc.

-- 
Best regards,
Aleksei Sidorin
Software Engineer,
IMSWL-IMCG, SRR, Samsung Electronics

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