Re: Instance variables overwritten by other assignments

[David Chisnall]

Hi,

This sounds like the issue with the Linux run-time linker and the 1.x 
non-fragile ABI.  This can be fixed by either:

1. Using pretty much any non-Linux OS, or
2. Using the 2.0 ABI and clang 8.0 or later.

David

> On 25 Dec 2019, at 04:02, Patryk Laurent <plaurent@me.com> wrote:
> 
> Hi,
> 
> At Gorm startup I am seeing a problem where Boolean assignments in 
> -initDefaults are somehow overwriting memory for NSTableView.m’s 
> _numberOfColumns instance variable.  See the output of debug print statements 
> below. 
> 
> Does anyone know why this might be happening — and how to fix it?
> 
> This is under clang-6.0 on Aarch64. 
> 
> Thank you,
> Patryk
> 
> GNUstep-build/apps-gorm/Gorm.app$ ./Gorm 
> 2019-12-25 03:51:47.959 Gorm[4257:4257] Bad palette selection - -1
> 2019-12-25 03:51:48.002 Gorm[4257:4257] Bad palette selection - -1
> 2019-12-25 03:51:48.267 Gorm[4257:4257] Bad palette selection - -1
> 2019-12-25 03:51:48.314 Gorm[4257:4257] NSTableview.m:2012: _isValidating     
> = NO; // _numberOfColumns is 0
> 2019-12-25 03:51:48.315 Gorm[4257:4257] NSTableview.m:2013: _drawsGrid        
> = YES; // _numberOfColumns is 0
> 2019-12-25 03:51:48.315 Gorm[4257:4257] NSTableview.m:2014: _rowHeight        
> = 16.0;  // _numberOfColumns is 0
> 2019-12-25 03:51:48.315 Gorm[4257:4257] NSTableview.m:2015: _intercellSpacing 
> = NSMakeSize (5.0, 2.0); // _numberOfColumns is 0
> 2019-12-25 03:51:48.316 Gorm[4257:4257] NSTableview.m:2016; 
> ASSIGN(_selectedColumns, [NSMutableIndexSet indexSet]); // _numberOfColumns 
> is 0
> 2019-12-25 03:51:48.316 Gorm[4257:4257] NSTableview.m:2018: 
> _allowsEmptySelection = YES;  // _numberOfColumns is 256
> 2019-12-25 03:51:48.317 Gorm[4257:4257] NSTableview.m:2019: 
> _allowsMultipleSelection = NO; // _numberOfColumns is 256
> 2019-12-25 03:51:48.317 Gorm[4257:4257] NSTableview.m:2020: 
> _allowsColumnSelection = YES; // _numberOfColumns is 65792
> 2019-12-25 03:51:48.317 Gorm[4257:4257] NSTableview.m:2021: 
> _allowsColumnResizing = YES;  // _numberOfColumns is 16843008
> 2019-12-25 03:51:48.317 Gorm[4257:4257] NSTableview.m:2022: 
> _allowsColumnReordering = YES;  // _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.317 Gorm[4257:4257] NSTableview.m:2023: // 
> _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.317 Gorm[4257:4257] NSTableview.m:2024; _selectingColumns 
> = NO; // _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.317 Gorm[4257:4257] NSTableview.m:2025: 
> _verticalMotionDrag = NO; // _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.318 Gorm[4257:4257] NSTableview.m:2026:_editedColumn = 
> -1; _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.318 Gorm[4257:4257] NSTableview.m:2027: _editedRow = -1; 
> // _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.318 Gorm[4257:4257] NSTableview.m:2028: _clickedRow = -1; 
> // _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.318 Gorm[4257:4257] NSTableview.m:2029: _clickedColumn = 
> -1;  // _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.318 Gorm[4257:4257] NSTableview.m:2030: _selectedColumn = 
> -1; // _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.318 Gorm[4257:4257] NSTableview.m:2031:  _selectedRow = 
> -1;  // _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.319 Gorm[4257:4257] NSTableview.m:2032: 
> _highlightedTableColumn = nil; // _numberOfColumns is 4311810304
> 2019-12-25 03:51:48.319 Gorm[4257:4257] NSTableview.m:2036: 
> ASSIGN(_sortDescriptors, [NSArray array]); // _numberOfColumns is 4311810304
> Segmentation fault
>