topic Re: debugging output generated by ifx in Intel® Fortran Compiler

debugging output generated by ifx

lrego-developer — Wed, 06 Mar 2024 12:54:34 GMT

Having worked with ifort based oneAPI for several years, for debugging the code I have used the flags

safe: FC_ALL += -check all -traceback -fstack-protector -assume protect_parens -implicitnone -warn all,noexternal -fpe-all=0
safe: CC_ALL += -traceback -fstack-protector

which gave a clear traceback of the error module-by-module, up to the line where the fault occurred.

However, with the new ifx-based oneAPI, the same compilation flags produce an incomprehensible output.

How can I recover the simpler and clearer debugging output I use to get from ifort?

Thanks.

Re: debugging output generated by ifx

Barbara_P_Intel — Wed, 27 Mar 2024 18:48:37 GMT

ifx uses LLVM memory sanitizer features to check for uninitialized variables. That output can be confusing. Ron posted this message about it.

ifx 2024.1.0 will be available in the next week or so.

Also, with ifx -check uninit examines scalars, arrays, array slices, array elements, allocatable, automatics, and derived types. By contrast, ifort could only catch local scalar variables of intrinsic type INTEGER, REAL, COMPLEX, and LOGICAL without the SAVE attribute.

One other point... this feature is only enabled on Linux.

Re: debugging output generated by ifx

lrego-developer — Mon, 01 Apr 2024 21:00:37 GMT

Hello there,

I have the following problem whenever I try to use ifx-based oneAPI toolkit to debug my code with the safe flags below

-g -check all,nouninit -traceback -fstack-protector -assume protect_parens -implicitnone -warn all,noexternal -fpe-all=0

The output produced by some fatal error (also featured in the attached image) is incomprehensible to me; it looks like

ifx: warning #10182: disabling optimization; runtime debug checks enabled
ld: EnvField.o: in function `PC_implicit_mapper':
ifxKE5Z2y.i:(.text+0x184f7): undefined reference to `__tgt_mapper_num_components'
ld: ifxKE5Z2y.i:(.text+0x1852f): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x18565): undefined reference to `__tgt_mapper_num_components'
ld: ifxKE5Z2y.i:(.text+0x1859a): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x186e3): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x1874f): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x188b1): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x1891d): undefined reference to `__tgt_push_mapper_component'
ld: EnvField.o:ifxKE5Z2y.i:(.text+0x18a95): more undefined references to `__tgt_push_mapper_component' follow
ld: EnvField.o: in function `ATOM_implicit_mapper':
ifxKE5Z2y.i:(.text+0x18c5c): undefined reference to `__tgt_mapper_num_components'
ld: ifxKE5Z2y.i:(.text+0x18ca0): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x18cd6): undefined reference to `__tgt_mapper_num_components'
ld: ifxKE5Z2y.i:(.text+0x18d0e): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x18e1b): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x18f2c): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x1903d): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x1914e): undefined reference to `__tgt_push_mapper_component'
ld: EnvField.o:ifxKE5Z2y.i:(.text+0x1925f): more undefined references to `__tgt_push_mapper_component' follow
ld: EnvField.o: in function `QNCA_a0$TYPE_M$.btMOLECULAR*$rank1$_implicit_mapper':
ifxKE5Z2y.i:(.text+0x1a854): undefined reference to `__tgt_mapper_num_components'
ld: ifxKE5Z2y.i:(.text+0x1a88c): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x1aaed): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x1ab5b): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x1acc6): undefined reference to `__tgt_push_mapper_component'
ld: ifxKE5Z2y.i:(.text+0x1adda): undefined reference to `__tgt_push_mapper_component'
ld: EnvField.o:ifxKE5Z2y.i:(.text+0x1aeee): more undefined references to `__tgt_push_mapper_component' follow
make: *** [makefile:222: dynemol] Error 1

Re: debugging output generated by ifx

Barbara_P_Intel — Mon, 01 Apr 2024 22:24:17 GMT

Can you please provide a small reproducer?

Re: debugging output generated by ifx

TilPiffl — Fri, 20 Dec 2024 16:12:29 GMT

I get a similar output when I try linking code that was compiled in debug mode with code that was compiled with some optimisations. This works fine with ifort, but not with ifx.

Unfortunately, this only happens on our rather larger code base, but not for the minimal examples I tried.

Compiling and running the code base completely either in debug or optimized mode works fine.

Re: debugging output generated by ifx

Devorah_H_Intel — Fri, 20 Dec 2024 18:43:58 GMT

We have some issues with Od that will be fixed in the next release. This means similar reports are already in the system and have been fixed. Hopefully, this will also cover your use case.