[LLVMdev] PATCH: AddressSanitizer: Fix errors about mis-matched exception specifiers for intercepted libc functions on Linux

[Chandler Carruth]

Hello,

On modern Linux installs, glibc has a very annoying practice: it adds an
empty exception specifier to lots of libc functions as an optimization. It
only does this if the compiler is modern and GCC-like, and we are compiling
in C++ mode.

This, however, causes GCC to complain about signature mismatches between
the glibc functions declared in malloc.h and those defined as an alias in
the interceptors library:

..../asan_malloc_linux.cc:57:1: error: declaration of 'void free(void*)'
has a different exception specifier
/usr/include/malloc.h:66:13: error: from previous declaration 'void
free(void*) throw ()'


I've attached a complete hack of a patch to address this... but surely
there is a better way? I'm open to suggestions about this sticky issue.

Amusingly, this is only diagnosed by GCC, not by Clang. =] So I didn't even
notice it at first.
-Chandler
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