internal compiler error: in convert, at lto/lto-lang.c:1292

[Stefan Beller]

Hello,

When running the command
arm-linux-gnueabi-g++ -flto -march=armv7-a -mcpu=cortex-a8 -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp main.cpp -o main.o

I get this output
In file included from main.cpp:21:0,
                 from :1:
/usr/lib/gcc/arm-linux-gnueabi/4.6/include/arm_neon.h: In function ‘main’:
/usr/lib/gcc/arm-linux-gnueabi/4.6/include/arm_neon.h:7908:77: internal compiler error: in convert, at lto/lto-lang.c:1256
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.6/README.Bugs> for instructions.
lto-wrapper: arm-linux-gnueabi-g++ returned 1 exit status
/usr/lib/gcc/arm-linux-gnueabi/4.6/../../../../arm-linux-gnueabi/bin/ld: lto-wrapper failed
collect2: ld returned 1 exit status

Attached there is a program which leads to this bug.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: g++-4.6-arm-linux-gnueabi 4.6.3-1ubuntu5cross1.62
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Sat Apr 28 16:24:31 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: gcc-4.6-armel-cross
UpgradeStatus: Upgraded to precise on 2012-02-18 (69 days ago)

[Marcin Juszkiewicz (hrw)]

Also affects 4.7:

08:42 hrw@puchatek:tmp$ arm-linux-gnueabi-g++-4.7 -flto -march=armv7-a -mcpu=cortex-a8 -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp main.cpp -o main.o
In file included from main.cpp:23:0,
                 from :7:
/usr/lib/gcc/arm-linux-gnueabi/4.7/include/arm_neon.h: In function ‘main’:
/usr/lib/gcc/arm-linux-gnueabi/4.7/include/arm_neon.h:7908:77: internal compiler error: in convert, at lto/lto-lang.c:1292
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-4.7/README.Bugs> for instructions.
lto-wrapper: arm-linux-gnueabi-g++-4.7 returned 1 exit status
/usr/lib/gcc/arm-linux-gnueabi/4.7/../../../../arm-linux-gnueabi/bin/ld: lto-wrapper failed
collect2: error: ld returned 1 exit status

Works with gcc-linaro 2012.05 cross.

[Stefan Beller (stefanbeller)]

So the original problem was circumvented by not using the gcc neon instructions,
but writing all needed functionality completely as inline assembly using the neon instructions.

[Marcin Juszkiewicz (hrw)]

Compiles fine with 4.6 and 4.7 cross compilers in quantal.