Bug 198912 – mingw32 fails to compile multiple inherited classes with virtuals correctly

• Status: RESOLVED FIXED
• Product: Gentoo Linux

[Description Alex Buell 2007-11-12 11:24:28 UTC]

Attached with this report is a short test program that demonstrates the error that mingw32 displays when it fails to compile this program. Checking with the GCC bugzilla, it turns out that there is a patch available that should solve this problem - see http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27067 for details. 

Reproducible: Always

Steps to Reproduce:
1.Build mingw32 using: crossdev --b 2.18-r1 --g 4.1.2 --k 3.10 --l 3.13 mingw32
2.mingw32-g++ virt_test.cpp -o virt_test.exe

Actual Results:  
 mingw32-g++ virt-test.cpp -o virt-test.exe
virt-test.cpp:69: error: ‘char *LTHUNK2()’ aliased to undefined symbol ‘_ZN6bottom4fun2Ev’
virt-test.cpp:69: error: ‘char *LTHUNK3()’ aliased to undefined symbol ‘_ZN6bottom4fun2Ev’
virt-test.cpp:69: error: ‘double *LTHUNK4()’ aliased to undefined symbol ‘_ZN6bottom4fun3Ev’
virt-test.cpp:69: error: ‘double *LTHUNK5()’ aliased to undefined symbol ‘_ZN6bottom4fun3Ev’


Expected Results:  
No linkage errors should have happened

[Comment 1 Alex Buell 2007-11-12 11:25:46 UTC]

Created attachment 135815 [details]
virtuals test case

[Comment 2 Alex Buell 2007-11-23 16:32:13 UTC]

Has there been any progress on this one? Thanks and apologies if work is already under way.

[Comment 3 Mark Loeser (RETIRED) 2009-05-02 02:59:47 UTC]

Fixed in newer versions of gcc.