Studio 11: bug in -O2 mode (64-bit) causes 'ube' error in Qt-4.1.0

Question

I think I have found a 64-bit optimizer bug in latest Studio 11
C++ compiler (CC -V: CC: Sun C++ 5.8 2005/10/13) when compiling
Qt-4.1.0/X11 with -O2 and with -xarch=generic64 on
Solaris 10/x86 (Opteron [Sun Fire V20z]).
To reproduce the problem, get latest Qt-4.1.0/X11 source code
(will probably be available to the public in a few days).
Unpack, then configure & build with:
# ./configure -release -platform solaris-cc-64
# make
CC -c -xarch=generic64 -D_XOPEN_SOURCE=500 -D__EXTENSIONS__ -O2 -DQT_EDITION=QT_EDITION_DESKTOP -DQT_BOOTSTRAPPED -DQT_RCC -DQT_LITE_UNICODE -DQT_NO_DATASTREAM -DQT_NO_THREAD -DQT_NO_QOBJECT -DQT_NO_UNICODETABLES -DQT_NO_LIBRARY -D_LARGEFILE64_SOURCE -D_LARGEFILE_SOURCE -I../../../mkspecs/solaris-cc-64 -I. -I../../corelib/arch/generic -I../../../include -I. -I../../../include/QtCore -I../../../include/QtXml -I. -I/usr/sfw/include -o .obj/release-shared/qxml.o ../../xml/qxml.cpp
"../../xml/qdom.cpp", line 2074: Warning: lineNumber hides QDomNodePrivate::lineNumber.
"../../xml/qdom.cpp", line 2074: Warning: columnNumber hides QDomNodePrivate::columnNumber.
"../../xml/qdom.cpp", line 4532: Warning: prefix hides QDomNodePrivate::prefix.
"../../xml/qdom.cpp", line 7477: Warning: locator hides QDomHandler::locator.
4 Warning(s) detected.
"../../xml/qxml.cpp", line 3385: Warning: Done hides QXmlSimpleReaderPrivate::Done.
[...repeats 18x...]
"../../xml/qxml.cpp", line 7757: Warning: error hides QXmlSimpleReaderPrivate::error.
20 Warning(s) detected.
"../../xml/qxml.cpp", line 4522: [__1cXQdDXmlSimpleReaderPrivateHparsePI6M_b_]:ube: error: Bad template number found in tmpl_emit
gmake[2]: *** [.obj/release-shared/qxml.o] Error 154
gmake[2]: *** Waiting for unfinished jobs....
gmake[2]: Leaving directory `/usr/local/qt-x11-commercial-src-4.1.0/src/tools/rcc'
gmake[1]: *** [sub-tools-rcc-make_default-ordered] Error 2
gmake[1]: Leaving directory `/usr/local/qt-x11-commercial-src-4.1.0/src'
gmake: *** [sub-src-make_default-ordered] Error 2
#The same file compiles fine if you just change -O2 into -O1 or
-O3 (or -O) or if you omit -xarch=generic64 (i.e. compile for 32 bits architecture).
Can anybody confirm this?
Thanks,
Jochen
PS: For the records: to get Qt-4.1.0 compiled anyway, simply change -O2 into -O in
file $QTDIR/mkspecs/solaris-cc-64/qmake.confbefore running configure

Answer 1

Jochen,
this is indeed a x86 optimizer bug. Thank you for reporting it. Indeed, -xO2 is the only optimization level which triggers the error for the file qxml.cpp, so if you can use -xO3 (or, the same, -O), the compiler will most likely produce more optimized binary.
Thanks,
Boris