microsoft / microsoft/vscode-cpptools
[Fortran] debugger only shows the first 1000 elements of arrays
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Description
Environment
- OS and version: Windows 10 Version 10.0.19045
- VS Code: 1.74.3
- C/C++ extension: 1.13.9
- GDB / LLDB version: mingw-w64 12.1
Bug Summary and Steps to Reproduce
Hello,
I am trying to debug a Fortran program using cppdbg but vscode only shows 1000 elements. I am able to see the other elements by manually writing expressions in the watch window for each section but the size of the arrays are dynamic, so this is not a viable solution.
It also seems like that this was an old problem that was fixed in a previous version (1.13.6) but I do not know why it happens in my case.
Debugger Configurations
launch.json:
{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"name": "Fdebugger Launch",
"type": "cppdbg",
"request": "launch",
"program": "${workspaceFolder}/myapp",
"args": [],
"stopAtEntry": false,
"cwd": "${workspaceFolder}",
"environment": [],
"externalConsole": false,
"MIMode": "gdb",
"preLaunchTask": "build",
"miDebuggerPath": "C:\\msys64\\mingw64\\bin\\gdb.exe",
"setupCommands": [
{
"text": "-enable-pretty-printing",
"description": "Enable GDB pretty printing",
"ignoreFailures": true
},
{
"description": "Set Disassembly Flavor to Intel",
"text": "-gdb-set disassembly-flavor intel",
"ignoreFailures": true
}
]
},
]
}
tasks.json:
{
// See https://go.microsoft.com/fwlink/?LinkId=733558
// for the documentation about the tasks.json format
"version": "2.0.0",
"tasks": [
{
"label": "build",
"type": "shell",
"command": "make -f Makefile",
"group": {
"kind": "build",
"isDefault": true
},
"presentation": {
"reveal": "silent",
"panel": "shared"
},
"problemMatcher": []
}
]
}
Makefile:
########################################################################
####################### Makefile Template ##############################
########################################################################
# Compiler settings - Can be customized.
CC = gfortran
CPP = gfortran -cpp
CXXFLAGS = -g -O0 -Wall -Wextra -fopenmp
LDFLAGS =
# Makefile settings - Can be customized.
APPNAME = myapp
EXT = .f90
SRCDIR = src
OBJDIR = obj
############## Do not change anything from here downwards! #############
Debugger Logs
NA
Other Extensions
I am using Modern Fortran and gfortran compiler, if that is relevant.
Additional Information
No response
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Research direction
Reproduce the report using the supplied launch.json, tasks.json, and Makefile with gfortran and GDB on Windows. Capture debugger logs and trace how cppdbg renders dynamic Fortran arrays; done means the full array is visible without manually entering slice expressions.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- fortran, vscode
- Domain
- devtools
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 35/100