Intel® Parallel Studio XE 2019 Composer Edition Fortran - Debug Solutions Release Notes

Known Issues and Limitations

• Disassembly window cannot be scrolled outside of 1024 bytes from the starting address within an offload section.
• Handling of exceptions from the Intel® MIC Architecture application is not supported.
• Starting an Intel® MIC Architecture native application is not supported. You can attach to a currently running application, though.
• The Thread Window in Microsoft Visual Studio* offers context menu actions to Freeze, Thaw and Rename threads. These context menu actions are not functional when the thread is on an Intel® Xeon Phi™ coprocessor.
• Setting a breakpoint right before an offload section sets a breakpoint at the first statement of the offload section. This only is true if there is no statement for the host between set breakpoint and offload section. This is normal Microsoft Visual Studio* breakpoint behavior but might become more visible with interweaved code from host and Intel® Xeon Phi™ coprocessor. The superfluous breakpoint for the offload section can be manually disabled (or removed) if desired.
• Only Intel® 64 applications containing offload sections can be debugged with the Intel® Debugger Extension for Intel® Many Integrated Core Architecture.
• Stepping out of an offload section does not step back into the host code. It rather continues execution without stopping (unless another event occurs). This is intended behavior.
• The functionality “Set Next Statement” is not working within an offload section.
• If breakpoints have been set for an offload section in a project already, starting the debugger might show bound breakpoints without addresses. Those do not have an impact on functionality.
• For offload sections, using breakpoints with the following conditions of hit counts do not work: “break when the hit count is equal to” and “break when the hit count is a multiple of”.
• The following options in the Disassembly window do not work within offload sections: “Show Line Numbers”, “Show Symbol Names” and “Show Source Code”
• Evaluating variables declared outside the offload section shows wrong values.
• Please consult the Output (Debug) window for detailed reporting. It will name unimplemented features (see above) or provide additional information required to configuration problems in a debugging session. You can open the window in Microsoft Visual Studio* via menu Debug->Windows->Output.
• When debugging an offload-enabled application and a variable assignment is entered in the Immediate Window, the debugger may hang if assignments read memory locations before writing to them (for example, x=x+1). Please do not use the Immediate Window for changing variable values for offload-enabled applications.
• Depending on the debugger extensions provided by Intel, the behavior (for example, run control) and output (for example, disassembly) could differ from what is experienced with the Microsoft Visual Studio* debugger. This is because of the different debugging technologies implemented by each and should not have a significant impact to the debugging experience.

Fortran Expression Evaluator (FEE) for debugging Fortran applications with Microsoft Visual Studio*

Fortran Expression Evaluator (FEE) is a plug-in for Microsoft Visual Studio* that is installed with Intel® Visual Fortran Compiler. It extends the standard debugger in Microsoft Visual Studio* IDE by handling Fortran expressions. There is no other change in usability.

Known Issues and Limitations

Conditional breakpoints limited

Conditional breakpoints that contain expressions with allocatable variables are not supported for Microsoft Visual Studio 2012* or later.

Debugging mixed language programs with Fortran does not work

To enable debugging Fortran code called from a .NET managed code application in Visual Studio 2012 or later, unset the following configuration:
Menu Tools->Options, under section Debugging->General, clear the "Managed C++ Compatibility Mode" or "Use Managed Compatibility Mode" check box

For any managed code application, one must also check the project property Debug > Enable unmanaged code debugging.

Native edit and continue

With Microsoft Visual Studio 2015*, Fortran debugging of mixed code applications is enabled if "native edit and continue" is enabled for the C/C++ part of the code. In earlier versions this is not supported.

FEE truncates entries in locals window

To increase debugging performance, the maximum number of locals queried by the debug engine is limited with Intel® Parallel Studio XE 2016 and later releases. If a location in the source code has more than that number of locals, they are truncated and a note is shown:

Note: Too many locals! For performance reasons the list got cut after 500 entries!

The threshold can be controlled via the environment variable FEE_MAX_LOCALS. Specify a positive value for the new threshold (default is 500). A value of -1 can be used to turn off truncation entirely (restores previous behavior) - but at the cost of slower debug state transitions. In order to take effect, Microsoft Visual Studio* needs to be restarted.

Problem with debugging C# applications

If Microsoft Visual Studio 2015* is used, debugging of C# applications might cause problems, i.e. evaluations like watches won't work.If you experience issues like that, try to enable "Managed Compatibility Mode". More details how to enable it can be found here:
http://blogs.msdn.com/b/visualstudioalm/archive/2013/10/16/switching-to-managed-compatibility-mode-in-visual-studio-2013.aspx

The problem is known and will be fixed with a future version.

Attributions

This product includes software developed at:

GDB – The GNU* Project Debugger

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