https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65837

--- Comment #12 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
(In reply to rguent...@suse.de from comment #11)
> On Thu, 23 Apr 2015, prathamesh3492 at gcc dot gnu.org wrote:
> 
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65837
> > 
> > --- Comment #10 from prathamesh3492 at gcc dot gnu.org ---
> > (In reply to Richard Biener from comment #9)
> > > (In reply to prathamesh3492 from comment #3)
> > > > Hi,
> > > > I tried to reproduce the error with a reduced test-case:
> > > > 
> > > > #include "arm_neon.h"
> > > > 
> > > > float32x2_t a, b, c, e;
> > > > 
> > > > int main()
> > > > {
> > > >   e = __builtin_neon_vmls_lanev2sf (a, b, c, 0);
> > > >   return 0;
> > > > }
> > > > 
> > > > arm-linux-gnueabihf-gcc -mfpu=neon test.c -flto test.c -c
> > > > arm-linux-gnueabihf-gcc test.o -flto -o test
> > > 
> > > this should still work according to my experiments.  -mfpu=neon should
> > > be passed to lto1 at link time - can you verify it's in the lto option
> > > section in test.o and on lto1 (by adding -v)?
> > -fmpu=neon is present, however it seems it's overriden by -mfpu=vfpv3-d16 in
> > the test.o file
> > arm-linux-gnueabihf-gcc -v -flto test.o
> > 
> > COLLECT_GCC_OPTIONS='-c' '-fmath-errno' '-fsigned-zeros' '-ftrapping-math'
> > '-fno-trapv' '-fno-strict-overflow' '-fno-openmp' '-fno-openacc' 
> > '-mfpu=neon'
> > '-march=armv7-a' '-mtune=cortex-a9' '-mfloat-abi=hard' '-mthumb'
> > '-mtls-dialect=gnu' '-v' '-march=armv7-a' '-mtune=cortex-a9' 
> > '-mfloat-abi=hard'
> > '-mfpu=vfpv3-d16' '-mthumb' '-mtls-dialect=gnu'
> > '-fltrans-output-list=/tmp/cc43ypaC.ltrans.out' '-fwpa'
> > '-fresolution=/tmp/ccmDzd6z.res'
> 
> Huh.  Can you see where that comes from?

Yeah that's odd - it's almost like the command line options passed to the TU
precede the defaults of the compiler.

Prathamesh, can you dig further - it sounds like we have a real issue here.

Ramana

> 
> Richard.
> 
> > /home/prathamesh.kulkarni/gcc-linaro-6.0/bin/../lib/gcc/../../libexec/gcc/arm-linux-gnueabihf/6.0.0/lto1
> > -quiet -dumpbase test.o -mfpu=neon -march=armv7-a -mtune=cortex-a9
> > -mfloat-abi=hard -mthumb -mtls-dialect=gnu -march=armv7-a -mtune=cortex-a9
> > -mfloat-abi=hard -mfpu=vfpv3-d16 -mthumb -mtls-dialect=gnu -auxbase test
> > -version -fmath-errno -fsigned-zeros -ftrapping-math -fno-trapv
> > -fno-strict-overflow -fno-openmp -fno-openacc
> > -fltrans-output-list=/tmp/cc43ypaC.ltrans.out -fwpa
> > -fresolution=/tmp/ccmDzd6z.res @/tmp/ccus6SMC
> > 
> > adding -mfpu=neon in the command line, only has -mfpu=neon
> > arm-linux-gnueaihf-gcc -v -mfpu=neon -flto test.o
> > 
> > COLLECT_GCC_OPTIONS='-c' '-fmath-errno' '-fsigned-zeros' '-ftrapping-math'
> > '-fno-trapv' '-fno-strict-overflow' '-fno-openmp' '-fno-openacc' 
> > '-mfpu=neon'
> > '-march=armv7-a' '-mtune=cortex-a9' '-mfloat-abi=hard' '-mthumb'
> > '-mtls-dialect=gnu' '-v' '-mfpu=neon' '-march=armv7-a' '-mtune=cortex-a9'
> > '-mfloat-abi=hard' '-mthumb' '-mtls-dialect=gnu'
> > '-fltrans-output-list=/tmp/ccCo0pAW.ltrans.out' '-fwpa'
> > '-fresolution=/tmp/ccRqEsoP.res'
> > /home/prathamesh.kulkarni/gcc-linaro-6.0/bin/../lib/gcc/../../libexec/gcc/arm-linux-gnueabihf/6.0.0/lto1
> > -quiet -dumpbase test.o -mfpu=neon -march=armv7-a -mtune=cortex-a9
> > -mfloat-abi=hard -mthumb -mtls-dialect=gnu -mfpu=neon -march=armv7-a
> > -mtune=cortex-a9 -mfloat-abi=hard -mthumb -mtls-dialect=gnu -auxbase test
> > -version -fmath-errno -fsigned-zeros -ftrapping-math -fno-trapv
> > -fno-strict-overflow -fno-openmp -fno-openacc
> > -fltrans-output-list=/tmp/ccCo0pAW.ltrans.out -fwpa
> > -fresolution=/tmp/ccRqEsoP.res @/tmp/ccArRJjW
> > 
> > Thanks,
> > Prathamesh
> > > 
> > > > lto1: fatal error: target specific builtin not available
> > > > compilation terminated.
> > > > lto-wrapper: fatal error:
> > > > /home/prathamesh.kulkarni/gnu-toolchain/gcc-chromium-arm-linux-gnueabihf/
> > > > builds/destdir/x86_64-unknown-linux-gnu/bin/arm-linux-gnueabihf-gcc 
> > > > returned
> > > > 1 exit status
> > > > compilation terminated.
> > > > 
> > > > However passing -mfpu=neon for linking works:
> > > > arm-linux-gnueabihf-gcc -mfpu=neon test.o -flto -o test
> > > > 
> > > > I suppose similar thing must be happening during linking
> > > > libshared_memory_support.so for chromium build ?
> > > > I couldn't see -mfpu=neon in the command line used for linking
> > > > libshared_memory_support.so
> > > > 
> > > > Thank you,
> > > > Prathamesh
> > 
> >

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