qt4-mac: internal compiler error: in lower_stmt, at gimple-low.c:286

[ryandesign (Ryan Carsten Schmidt)]

Building qt4-mac fails with gcc-4.2 on Leopard PowerPC with:

html/HTMLTitleElement.cpp: In member function ?void WebCore::HTMLTitleElement::setText(const WTF::String&)?:                                                                                                  
html/HTMLTitleElement.cpp:107: internal compiler error: in lower_stmt, at gimple-low.c:286                                                                                                                    
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Of course submitting a bug report about gcc to Apple is pointless by now.

This probably came about due to MacPorts 2.2 which now uses gcc-4.2 as the default compiler on Leopard instead of gcc-4.0.

I found what seems to be an ​upstream bug report about this problem for FSF GCC 4.2.3, fixed in 4.3/4.4, but of course that doesn't help us with Apple GCC. However I haven't had problems building qt4-mac on Snow Leopard, which uses a later build of Apple gcc-4.2, so I assume Apple either backported or reinvented the fix for this by Snow Leopard, but of course that doesn't help Leopard users.

#40422 requests gcc-4.0 be blacklisted. Based on my experience here, we may also have to blacklist Leopard's gcc-4.2 (which is build 5577 or earlier). Xcode 3.2.6 has gcc-4.2 build 5666 dot 3 so we don't need to blacklist that, but I don't know where between 5578 and 5666.3 the problem was fixed.

I have not tested Leopard Intel yet. It's also possible it's a PowerPC-only problem.

[ryandesign (Ryan Carsten Schmidt)]

Replying to ryandesign@…:

I have not tested Leopard Intel yet. It's also possible it's a PowerPC-only problem.

The build succeeded on Leopard Intel also with gcc-4.2 build 5577. How strange. (The upstream bug report I mentioned was on Linux Intel.)

[michaelld (Michael Dickens)]

Any recommendation on how to blacklist correctly for this issue?

[michaelld (Michael Dickens)]

Repeat of my question: Any recommendation on how to blacklist correctly for this issue?

[michaelld (Michael Dickens)]

No response, and, really, does this matter any longer? Closing as wontfix. If you disagree then reopen and provide some feedback. I can't test potential fixes, but I'm happy to incorporate a patch if someone creates one.