Date: Thu, 12 Oct 2006 12:54:14 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Mikhail Teterin <mi+mx@aldan.algebra.com> Cc: stable@freebsd.org, gerald@freebsd.org Subject: Re: Bug in 6.x' C++ compiler Message-ID: <20061012095414.GM60834@deviant.kiev.zoral.com.ua> In-Reply-To: <200610111322.57735.mi%2Bmx@aldan.algebra.com> References: <200610111322.57735.mi%2Bmx@aldan.algebra.com>
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--1rguoi8KZGYj2k4L Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Oct 11, 2006 at 01:22:57PM -0400, Mikhail Teterin wrote: > GCC would not fix the bug described in >=20 > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D29390 >=20 > because the compiler is of an unsupported version (they only support 4.x = now). >=20 > Yet, the problem is rather real and hits when the devel/icu port is > built with low optimization (-O1 or -O0). > > Any chance, someone with interest in GCC internals and FreeBSD can > find the fix? > > Simply compiling the loctest.ii, that is attached to the above bugzilla= =20 > report, is enough to reproduce the problem. Compiling with `-march=3Dpent= ium4'=20 > triggers the bug -- a bogus symbol is inserted: >=20 > % c++ -O0 -g -c -pipe -march=3Dpentium4 loctest.ii > % nm locate.o | fgrep .LC > U .LC786 >=20 > Compiling without the -march (or with -O2) does not insert the bogus symb= ol: >=20 > % c++ -O2 -g -c -pipe -march=3Dpentium4 loctest.ii > % nm loctest.o | fgrep .LC > % c++ -O0 -g -c -pipe loctest.ii > % nm loctest.o | fgrep .LC > % >=20 > I'm seeing this with both 3.4.4 and 3.4.6 versions of GCC... Thanks! >=20 > -mi deviant% /usr/local/opt/gcc-3.4.6/bin/g++ -O0 -g -c -fno-strict-aliasing -p= ipe -march=3Dpentium4 loctest.ii deviant% nm loctest.o | grep LC U _ZNK7icu_3_66Locale7getLCIDEv deviant% c++ -O0 -g -c -fno-strict-aliasing -pipe -march=3Dpentium4 loctest= .ii deviant% nm loctest.o | grep LC U .LC786 U _ZNK7icu_3_66Locale7getLCIDEv deviant% /usr/local/opt/gcc-3.4.6/bin/g++ -v=20 Reading specs from /usr/local/opt/gcc-3.4.6/lib/gcc/i386-little-freebsd6/3.= 4.6/specs Configured with: ../gcc-3.4.6/configure --prefix=3D/usr/local/opt/gcc-3.4.6= --enable-shared --enable-threads --with-system-zlib --enable-__cxa_atexit = --disable-nls --enable-long-long --with-as=3D/usr/local/opt/binutils/bin/as= --with-ld=3D/usr/local/opt/binutils/bin/ld --enable-languages=3Dc,c++,f77,= objc,ada,java --host=3Di386-little-freebsd6 Thread model: posix gcc version 3.4.6 deviant% c++ -v Using built-in specs. Configured with: FreeBSD/i386 system compiler Thread model: posix gcc version 3.4.6 [FreeBSD] 20060305 opt/gcc-3.4.6 is the stock version of the 3.4.6 built directly from the FSF sources (relatively long time ago). --1rguoi8KZGYj2k4L Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (FreeBSD) iD8DBQFFLhDGC3+MBN1Mb4gRAoqMAJ9U/m0IUN+3/jw3Mi2FqRBMdjGZYwCfUm/p 5dQgxgC3o7fuKAnmtQef2dM= =bL/d -----END PGP SIGNATURE----- --1rguoi8KZGYj2k4L--
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