depends: Cross-compiling qt for arm-linux-gnueabihf fails #29980

1. 
   hebasto commented at 5:40 pm on April 27, 2024: member

   On Ubuntu 24.04 with glibc 2.39:

   0compiling ../3rdparty/zlib/src/gzclose.c
   1In file included from /usr/arm-linux-gnueabihf/include/features.h:394,
   2                 from /usr/arm-linux-gnueabihf/include/bits/libc-header-start.h:33,
   3                 from /usr/arm-linux-gnueabihf/include/stdio.h:28,
   4                 from ../3rdparty/zlib/src/gzguts.h:40,
   5                 from ../3rdparty/zlib/src/gzclose.c:6:
   6/usr/arm-linux-gnueabihf/include/features-time64.h:26:5: error: #error "_TIME_BITS=64 is allowed only with _FILE_OFFSET_BITS=64"
   7   26 | #   error "_TIME_BITS=64 is allowed only with _FILE_OFFSET_BITS=64"
   8      |     ^~~~~
   

   Some similar issues in https://bugreports.qt.io suggest to switch from the builtin zlib to a system one. But that doesn’t look like an option for us.

2. hebasto added the label Linux/Unix on Apr 27, 2024
3. hebasto added the label Build system on Apr 27, 2024
4. 
   laanwj commented at 8:02 am on April 28, 2024: member

   This is caused by the 32 to 64 bit time_t transition (for the 2038 epoch problem). It will affect all 32-bit Linux systems.

   I would guess solving this requires a minimal patch to the zlib inside Qt to make the right combination of defines. i’ll take a look at it.

5. laanwj assigned laanwj on Apr 28, 2024
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