[Bug 1836045] Re: ftbfs: gnat cross targeting powerpc

[Seth Forshee]

SO_SNDTIMEO_OLD and SO_RCVTIMEO_OLD are new in 5.1, due to some
shuffling to support y2038-safe socket timeout options. They should be
defined in headers installed by linux-libc-dev, as follows:

usr/include/asm-generic/socket.h:
  #define SO_RCVTIMEO (sizeof(time_t) == sizeof(__kernel_long_t) ? SO_RCVTIMEO_OLD : SO_RCVTIMEO_NEW)
  #define SO_SNDTIMEO (sizeof(time_t) == sizeof(__kernel_long_t) ? SO_SNDTIMEO_OLD : SO_SNDTIMEO_NEW)

usr/include/powerpc64le-linux-gnu/asm/socket.h:
  #define SO_RCVTIMEO_OLD        18
  #define SO_SNDTIMEO_OLD        19

So it seems likely that the would be coming from the
SO_RCVTIMEO/SO_SNDTIMEO definitions, which should get pulled in from the
ppc asm header pulling in the asm-generic header. But I can't see how it
would end up with those definitions but not the definitions for the
corresponding *_OLD symbols.

Looking at kernel changes since 5.0, as far as I can tell nothing has
changed wrt NAME_MAX and ENOENT. The other symbols don't appear to be
from the kernel.

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Title:
  ftbfs: gnat cross targeting powerpc

Status in gcc-8-cross package in Ubuntu:
  Confirmed
Status in gcc-9-cross package in Ubuntu:
  Confirmed

Bug description:
  both seen with gcc-8-cross and gcc-9-cross (search the build logs for
  "unfinished":

  /<<PKGBUILDDIR>>/gcc/build/./gcc/xgcc -B/<<PKGBUILDDIR>>/gcc/build/./gcc/ -B/usr/powerpc-linux-gnu/bin/ -B/usr/powerpc-li
  nux-gnu/lib/ -isystem /usr/powerpc-linux-gnu/include -isystem /usr/powerpc-linux-gnu/sys-include -isystem /<<PKGBUILDDIR>
  >/gcc/build/sys-include    -c -g -O2   -W -Wall -gnatpg -nostdinc  -gnatn  a-direct.adb -o a-direct.o
  a-direct.adb:734:27: "NAME_MAX" is undefined
  a-direct.adb:743:28: "SIZEOF_struct_dirent_alloc" is undefined
  a-direct.adb:1210:24: "ENOENT" is undefined
  s-filatt.ads:62:18: "SIZEOF_struct_file_attributes" not declared in "OS_Constants"
  s-oscons.ads:50:26: "Target_OS" is undefined
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  make[9]: *** [../gcc-interface/Makefile:299: a-direct.o] Error 1
  make[9]: Leaving directory '/<<PKGBUILDDIR>>/gcc/build/gcc/ada/rts'
  make[8]: *** [gcc-interface/Makefile:623: gnatlib] Error 2

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