Daily Coverity analysis on gcc

[Sylvestre Ledru]

Over the last few weeks, working with Jonathan, I have been running
daily analysis of Coverity (a proprietary static analyzer tool)
It is running on a Debian amd64 with the options:
--with-gnu-as --with-gnu-ld --disable-bootstrap 
--enable-languages=jit,c,c++,fortran,lto,objc  --enable-host-shared

Coverity finds about 4300 defects. The defect density is 1.67 for 2.5
millions line of code.

As a comparison, the llvm toolchain (llvm, clang, lldb, etc) has 3223
defects (0.62 of defect density for 5.1M loc).

Most of the defect are detected as resource leaks (1681 defects). I had
a quick look and many of them are actual issues (in many cases minor), I
took the
opportunity to fix some of them.

To access to the list of results, you can apply
https://scan.coverity.com/projects/gcc, please try to prove that you are
a gcc contributor.

Thanks,
Sylvestre