Fwd: Bug#819069: dietlibc: FTBFS on powerpcspe due to missing FPU emulation in library

Hi Felix,

unsure if you saw that. powerpcspe is an architecture which differs
slightly from powerpc and has no FPU. The fix is probably to merge
GCC=E2=80=99s FPU emulation code (as dietlibc also uses the GPL this could
work).

---------- Forwarded message ----------
From: John Paul Adrian Glaubitz <[email protected]>
Message-ID:
    <145873929931.14974.10725083240958549148.reportbug@z6.physik.fu-berlin.=
de>
Date: Wed, 23 Mar 2016 14:21:39 +0100
Subject: Bug#819069: dietlibc: FTBFS on powerpcspe due to missing FPU emula=
tion
    in library

Source: dietlibc
Version: 0.33~cvs20120325-6
Severity: normal
User: [email protected]
Usertags: powerpcspe

Hello!

dietlibc currently fails to build from source on powerpcspe because the cod=
e
is missing FPU emulation:

test/select.c:12:5: warning: implicit declaration of function 'perror' [-Wi=
mplicit-function-declaration]
     perror("select");
     ^
=2E/ttt
rm -f ttt
bin-'ppc'/diet -v -Os gcc -nostdinc -static -o ttt debian/test/tc523086.c
gcc -nostdlib -static -L/B+PKGBUILDDIRB;/bin-ppc /B+PKGBUILDDIRB;/bin-ppc/s=
tart.o -nostdinc -static -o ttt debian/test/tc523086.c -isystem /B+PKGBUILD=
DIRB;/include -D__dietlibc__ -Os -fomit-frame-pointer -mpowerpc-gpopt -mpow=
erpc-gfxopt /B+PKGBUILDDIRB;/bin-ppc/dietlibc.a -lgcc -fno-stack-protector=
=20
/B+PKGBUILDDIRB;/bin-ppc/dietlibc.a(vprintf.o): In function `vprintf':
vprintf.c:(.text+0x64): warning: warning: the printf functions add several =
kilobytes of bloat.
/B+PKGBUILDDIRB;/bin-ppc/dietlibc.a(__dtostr.o): In function `__dtostr':
__dtostr.c:(.text+0xc0): undefined reference to `__unorddf2'
__dtostr.c:(.text+0x110): undefined reference to `__unorddf2'
collect2: error: ld returned 1 exit status
make: *** [build-stamp] Error 1
debian/rules:54: recipe for target 'build-stamp' failed

"__unorddf2" is a function in the FPU emulation library present in glibc. I=
n
the past, the FPU emulation code was present in libgcc which is why dietlib=
c
used to build find on powerpcspe. However, the FPU emulation code in gcc
has been deprecated in favour of the code present in glibc 2.19 or newer [1=
]
and any recent version of gcc built on a system with glibc 2.19 or newer
will automatically deactivate its built-in FPU emulation code.

I don't know if any FPU emulation code is actually present in dietlibc, but
if there is, it should be enabled similar to what was done in glibc [2].

Cheers,
Adrian

> [1] https://patchwork.ozlabs.org/patch/405072/
> [2] https://anonscm.debian.org/cgit/pkg-glibc/glibc.git/commit/?id=3D0d9b=
726ce6b29614d1ddd4e55502a9221cfb4d04

--=20
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - [email protected]
`. `'   Freie Universitaet Berlin - [email protected]
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913