1255256 - decl for free/malloc is after use in mozalloc.h (gcc 6)

Status: RESOLVED DUPLICATE of bug 1245076

(Core :: Memory Allocator, defect)

Description

[Martin Thomson [:mt:]]

I'm compiling with gcc 6.0.0 and mozalloc.h is throwing these sorts of errors for both malloc() and free():

/home/martin/code/obj/bug1018299/default/dist/include/mozilla/mozalloc.h:192:12: error: use of undeclared identifier 'malloc'
    return malloc_impl(size);

Running the preprocessor, this seems to be a product of a loop, which is ultimately terminated by the usual #ifndef guards:

mozalloc.h includes our stdlib.h wrapper
... includes the libstdc++ stdlib.h wrapper
... includes our cstdlib wrapper
... includes mozalloc.h
... includes stdlib.h which is a noop

... and then tries to reference malloc/free, but those are declared in the tail of the libstdc++ stdlib.h wrapper.

Comment 1

[Mike Hommey [:glandium]]

Note that this is not the only issue with gcc 6, which appears to also miscompile Firefox, so please refrain from using it for now.