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On 11/15/2016 04:39 PM, Joseph Myers wrote:
On Tue, 15 Nov 2016, Florian Weimer wrote:In my opinion, the larger ecosystem already provides suitable replacements. * <mcheck.h> and all malloc hook functions are now deprecated. Future implementations of the mcheck- and mtrace-related functions will not have any effect, and glibc will stop calling the hook functions from its malloc implementation. Instead of mcheck and mtrace, developers should consider using valgrind. As a replacement for the hook functions, developers can interpose their own malloc implementation.I don't consider valgrind suitable for replacing the uses of mtrace in the glibc testsuite (or other similar uses elsewhere for lightweight checking for leaks).
I completely agree.The above is for the NEWS file, for external use. For internal use, we still need a solution. (I have an mtrace-compatible interposition-based tracer almost finished, but it may not make the cut for the next release, and it may be superseded by DJ's work anyway.) I think we can run internal deprecation at a different pace than external deprecation.
I don't know enough about the functionality GDB expects from linking with -lmcheck by default in development to know whether other malloc improvements would provide similar checking by default or whether that would also need GDB to provide its own malloc (again, I think valgrind is vastly too heavyweight for using by default in GDB development).
I wasn't aware that GDB developers are using this functionality. I'll ask them how critical it is to their needs. But I expect that there will be no glibc release which neither provides mcheck, nor provides an alternative.
Thanks, Florian
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