[Buildroot] [autobuild.buildroot.net] Build results for 2015-12-06

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, Vicente, All,

On 2015-12-07 08:30 +0100, Thomas Petazzoni spake thusly:
> Build statistics for 2015-12-06
>         mips |                   ffmpeg-2.8.3 | NOK | http://autobuild.buildroot.net/results/11c681f344c90f7faf40ece25909cd14ad21def0/
>         mips |                   ffmpeg-2.8.3 | NOK | http://autobuild.buildroot.net/results/c0f8d11a3ce3b15b5d029934f938e8700ed127cd/

Those and similar build failures on mip64el, and due to incompatible
cflags passed to the compiler:

    /home/ymorin/dev/buildroot/O/host/usr/bin/mips64el-linux-gcc
    -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
    --sysroot=/home/ymorin/dev/buildroot/O/host/usr/mips64el-buildroot-linux-gnu/sysroot
    -isysroot /home/ymorin/dev/buildroot/O/host/usr/mips64el-buildroot-linux-gnu/sysroot
    -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
    -D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 -DPIC -D_LARGEFILE_SOURCE
    -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Os -march=mips64r6
    -std=c99 -fomit-frame-pointer -fPIC -mips64 -mhard-float
    -I/home/ymorin/dev/buildroot/O/host/usr/mips64el-buildroot-linux-gnu/sysroot/usr/include
    -L/home/ymorin/dev/buildroot/O/host/usr/mips64el-buildroot-linux-gnu/sysroot/usr/lib
    -c -o /tmpfs/ffconf.sKCSXxBR.o /tmpfs/ffconf.E9anwOiq.c
    /tmpfs/ffconf.E9anwOiq.c:1:0: error: '-mips64' conflicts with the other
    architecture options, which specify a mips64r6 processor
     #include <gnutls/gnutls.h>
     ^
    ERROR: gnutls not found using pkg-config

They have nothing to do with gnutls.

So, -march=mips64r6 conflicts with -mips64 (equivalent to -march=mips64)

ffmpeg is using a custom, hand-written ./configure script, and it does
weird things, like, in the case of mips:

  3986 elif enabled mips; then
  3987
  3988     cpuflags="-march=$cpu"
  3989
  3990     case $cpu in
  [--SNIP--]
  4078     esac

... and (in the case I tested) we pass --cpu=mips64r6.

But the case-block does not have a case for mips64r6, so it leave
'mips64 enabled' (in ffmpeg parlance), and furhter down the line, it
forcibly passes -mips64:

  4854     elif enabled mips64 && enabled mipsfpu && disabled loongson2 && disabled loongson3; then
  4855         add_cflags "-mips64"
  4856         add_asflags "-mips64"

Notice that it does have a mips64r6 knowledge, since a little bit
further, it does check for it:

  4860     elif enabled mips32r5 || enabled mips64r6; then
  4861         check_cflags "-mfp64"
  4862         check_ldflags "-mfp64"

However, mips64 is never disabled, so mips64r6 never tested.

Vicente, any help? ;-)

Regards,
Yann E. MORIN.

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