Linking errors when using memory sanitizer in fortran project

[ogmundur]

When I use the check uninit option in a large, mixed language (fortran and C) project with the new ifx driver I get a huge amount of the following linking errors:

undefined reference to `__msan_chain_origin'

with references to numerous other routines from the memory sanitizer all beginning with __msan. If I turn the uninit check off, the project compiles and links successfully.

I am using ifx version 2023.2.0. I am using CMake, which automatically selects ifx to link the executable.

Should I be passing further options to the linker, so that it finds the memory sanitzer routines?

[Barbara_P_Intel · Accepted solution]

When you compile with -check uninit (or -check all) you also need to link with that compiler option.

[ogmundur]

Great, thanks - that did the trick!

[dkokron_wcoss2]

What are my options for a mixed language (fortran and c++) application where some fortran code is compiled (ifx) with "-check uninit" but the application is linked with icpx (which does not recognize the -check option )?  I'm on Linux using OneAPI-2024.2.1.

[Mark_Lewy]

Use "-fsanitize=memory" when compiling C/C++ to be used with "-check uninit" from ifx.

[jimdempseyatthecove]

If your C++ code is the main of the program, then remember to insert early into your main(...) 

int argc;
char **argv;
void for_rtl_init_ (int *, char **);
for_rtl_init_ (&argc, argv);

And at the end of the program

int io_status;
int for_rtl_finish_ ( );
io_status = for_rtl_finish_ ( );

It is probably best practice in C++ to make a class or struct with the ctor doing the init and the dtor doing the finish.

Jim Dempsey

[dkokron_wcoss2]

Mark,

I will try that and report results back here.

Dan

[dkokron_wcoss2]

The code is a mix of C/C++ and fortran.  The C/C++ is compiled with icc/icpx while the fortran is compiled with ifort.  All compilers are from the intel-2024.2.1 suite.  The fortran compiles include "-g -O0 -traceback -init=arrays,snan -check bounds,uninit -fpe0".  The C/C++ flags may include -fsanitize=memory.  The link is attempted with ifort and that gives the error about missing msan_*.  An attempt to link with ifx results in a different error.  An attempt to link with "icpc -fsanitize=memory ...." results in "undefined reference to symbol 'for_array_initialize'"

That's where things stand.