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From: Philippe W. <phi...@sk...> - 2015-10-28 21:36:11
|
On Tue, 2015-10-27 at 16:54 +0000, William Good wrote: > Hello, > I would like to use some C++ containers in my tool. I have attempted > to modify my tool's Makefile.am by adding AM_CXXFLAGS = -std=gnu++11 > at the top and changing $(LINK) to $(CXXLINK). However, because of > the -nodefaultlibs switch I have to manually add libraries to be > linked. I receive a multiple definition error: > > > /usr/lib/gcc/x86_64-redhat-linux/5.1.1/../../../../lib64/libc.a(abort.o): In function `abort': > (.text+0x0): multiple definition of `abort' > ../coregrind/libcoregrind-amd64-linux.a(libcoregrind_amd64_linux_a-m_main.o):/home/will/Downloads/vg1/coregrind/m_main.c:2861: first defined here > > > There is a conflict because of valgrind's redefinition of standard > library functions. Is it possible or are the examples of using C++ in > a valgrind tool. Using libraries to develop tool is not allowed. Even using the libc syscalls is not allowed, so valgrind has its own layer to interface to the kernel. Valgrind also has a re-implementation of all needed 'library functions' e.g. strcmp is not called in valgrind tools, instead, you need to call the re-implementation that has the name VG_(strcmp). As far as I know, the reason is that using libraries in a tool might give that some library functions would be re-entered (called by the tool) while a function of the library might be "busy" executing by the client. This can then lead to deadlocks or whatever similar problems (e.g. imagine the library has a lock. If the tool calls a function that needs to take the same lock, this will give a deadlock). In summary, you cannot use any library in Valgrind tools. I think you should be able to use C++, as long as your C++ code does not make any library calls/does not have any dependency to any c++ runtime/library/... So, using c++ without any runtime/library might be difficult to achieve. Philippe NB: I replied to the valgrind developer post. No need to ask such questions on the user list, the valdev list is the good one for such subjects. |