[Bug 1891565] Re: oss4 does not build on ppc64el on groovy

[Thadeu Lima de Souza Cascardo]

So, dot-symbols on powerpc are not a thing on userspace since a while
(from gcc 3.4 times). And, then, I realized this header comes directly
from alsa, and for a different reason, this same section has already
been dropped there. So applying the same changes makes sense here.

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https://bugs.launchpad.net/bugs/1891565

Title:
  oss4 does not build on ppc64el on groovy

Status in binutils package in Ubuntu:
  New
Status in oss4 package in Ubuntu:
  In Progress

Bug description:
  When building the focal version of oss4 with groovy version of
  binutils, it fails with:

  /tmp/ccoZchTf.s: Assembler messages:
  /tmp/ccoZchTf.s: Error: invalid attempt to declare external version name as default in symbol `.snd_pcm_hw_params_set_rate_near@@ALSA_0.9.0rc4'
  make[1]: *** [Makefile:16: pcm.lo] Error 1

  Downgrading binutils to 2.34-6ubuntu1 fixes the problem. This works
  with gcc-9 9.3.0-10ubuntu2. Upgrading to groovy gcc-9 9.3.0-17ubuntu1
  will force the upgrade of binutils, so can't be tested with the
  working version of binutils. Using the latest version of gcc-9 or
  gcc-10 from groovy with the broken binutils is still broken, so a
  complete upgrade does not fix the problem.

  The following diff does fix the problem with binutils 2.35-2ubuntu1, though:
  $ diff -u lib/libsalsa/alsa-symbols.h.old lib/libsalsa/alsa-symbols.h
  --- lib/libsalsa/alsa-symbols.h.old     2020-08-13 22:47:28.249358919 +0000
  +++ lib/libsalsa/alsa-symbols.h 2020-08-13 22:43:35.730423956 +0000
  @@ -35,7 +35,7 @@
          __asm__ (".symver ." #real ",." #name "@" #version)
   # define default_symbol_version(real, name, version)           \
          __asm__ (".symver " #real "," #name "@@" #version);     \
  -       __asm__ (".symver ." #real ",." #name "@@" #version)
  +//     __asm__ (".symver ." #real ",." #name "@@" #version)
   #else
   # define symbol_version(real, name, version) \
          __asm__ (".symver " #real "," #name "@" #version)

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