[fpc-pascal] SIGSEGV with -O2 (was: Illegal type conversion...)
juha.manninen at phnet.fi
Mon Nov 23 13:40:56 CET 2009
I am testing VirtualTreeView with its "Advanced" demo program. When I use FPC
2.5.1 and compile it with -O1, it works always however much I click the
When compile it with -O2 and click and test furiously it finally throws
SIGSEGV. The message box says:
Project Advanced raised exception class 'External: SIGSEGV'.
Often it paralyzed my KDE desktop partly so that mouse commands didn't work.
Then I selected terminal using keyboard and killed gdb and then things worked
again. Sometimes it didn't freeze.
I tested the same VirtualTreeView code (with my added $packset directives)
also with FPC 2.2.4 and it worked with or without optimization.
I understand the compiler is a devel version but if you need a good test case,
here you have one.
I compiled whole Lazarus with FPC 2.5.1 and -O2 and it works well.
VirtualTreeView has non-portable assembly code and may be difficult for the
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