From: Segher Boessenkool <segher@kernel.crashing.org>
To: Michael Meissner <meissner@linux.ibm.com>,
gcc-patches@gcc.gnu.org, David Edelsohn <dje.gcc@gmail.com>,
Bill Schmidt <wschmidt@linux.ibm.com>,
Peter Bergner <bergner@linux.ibm.com>, Jeff Law <law@redhat.com>,
Jonathan Wakely <jwakely@redhat.com>
Subject: Re: [PATCH 0/9] PowerPC: Patches to enable changing the long double default to IEEE 128-bit on little endian PowerPC 64-bit Linux systems
Date: Mon, 19 Oct 2020 16:50:31 -0500 [thread overview]
Message-ID: <20201019215031.GW2672@gate.crashing.org> (raw)
In-Reply-To: <20201019191213.GA22485@ibm-toto.the-meissners.org>
On Mon, Oct 19, 2020 at 03:12:13PM -0400, Michael Meissner wrote:
> On Fri, Oct 16, 2020 at 02:14:04PM -0500, Segher Boessenkool wrote:
> > On Thu, Sep 24, 2020 at 04:20:36PM -0400, Michael Meissner wrote:
> > > You will need a new enough GLIBC in order to do this configuration.
> >
> > What happens if you glibc is older, and you try?
>
> You get linker errors due to the older GLIBC not using -mno-gnu-attribute in
> all of the appropriate places, and and not all of the names that are renamed
> will be present.
>
> -marlin-> ./xgcc -B./ -O2 -g foo.c -lm -mabi=ieeelongdouble -Wno-psabi && ./a.out
> /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: /opt/at13.0/lib/../lib64/libm.so uses IBM long double, /home/meissner/tmp/gcc-tmp/ccvzdRyj.o uses IEEE long double
> /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: ./libgcc_s.so.1 uses IBM long double, /home/meissner/tmp/gcc-tmp/ccvzdRyj.o uses IEEE long double
> /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: /opt/at13.0/lib/../lib64/libc.so.6 uses IBM long double, /home/meissner/tmp/gcc-tmp/ccvzdRyj.o uses IEEE long double
> /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: ./libgcc_s.so.1 uses IBM long double, /home/meissner/tmp/gcc-tmp/ccvzdRyj.o uses IEEE long double
> /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: /home/meissner/tmp/gcc-tmp/ccvzdRyj.o: in function `main':
> /home3/meissner/fsf-build-ppc64le/work020-at13.0/gcc/foo.c:8: undefined reference to `__sinieee128'
> /home3/meissner/fsf-install-ppc64le/binutils-gdb/bin/ld: /home3/meissner/fsf-build-ppc64le/work020-at13.0/gcc/foo.c:8: undefined reference to `__printfieee128'
> collect2: error: ld returned 1 exit status
So this requirement needs to be put in the release notes. It also is a
regression, but I guess we will just have to live with that :-(
Segher
prev parent reply other threads:[~2020-10-19 21:51 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-24 20:20 Michael Meissner
2020-09-24 20:31 ` [PATCH 1/9] PowerPC: Map long double built-in functions if IEEE 128-bit long double Michael Meissner
2020-10-01 23:05 ` Joseph Myers
2020-10-08 5:20 ` Michael Meissner
2020-09-24 20:33 ` [PATCH 2/9] PowerPC: Update __float128 and __ibm128 error messages Michael Meissner
2020-09-24 20:34 ` [PATCH 3/9] PowerPC: Update IEEE <-> IBM 128-bit floating point conversions Michael Meissner
2020-09-24 20:35 ` [PATCH 4/9] PowerPC: Add IEEE 128-bit <-> Decimal conversions Michael Meissner
2020-09-24 20:36 ` [PATCH 5/9] PowerPC: Update tests to run if long double is IEEE 128-bit Michael Meissner
2020-09-24 20:40 ` [PATCH 6/9] PowerPC: If long double is IEEE 128-bit, map q built-ins to *l instead of *f128 Michael Meissner
2020-09-24 20:42 ` [PATCH 7/9] PowerPC: Update IEEE 128-bit built-in functions to work if long double is IEEE 128-bit Michael Meissner
2020-09-24 20:45 ` [PATCH 8/9] PowerPC: Change tests to use __float128 instead of __ieee128 Michael Meissner
2020-09-24 20:47 ` [PATCH 9/9] PowerPC: Use __builtin_pack_ieee128 if long double is IEEE 128-bit Michael Meissner
2020-10-09 4:35 ` [PATCH 1/9, revised] PowerPC: Map long double built-in functions if IEEE 128-bit long double Michael Meissner
2020-10-16 20:30 ` Segher Boessenkool
2020-10-19 19:30 ` Michael Meissner
2020-10-19 21:24 ` Michael Meissner
2020-10-12 23:16 ` Ping: [PATCH 0/9] PowerPC: Patches to enable changing the long double default to IEEE 128-bit on little endian PowerPC 64-bit Linux systems Michael Meissner
2020-10-16 14:37 ` Ping #2: " Michael Meissner
2020-10-16 19:14 ` Segher Boessenkool
2020-10-19 19:12 ` Michael Meissner
2020-10-19 21:50 ` Segher Boessenkool [this message]
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