[ruby-core:106706] [Ruby master Bug#18330] Make failure on 32-bit Linux (Android) with Clang due to implicit 64-to-32-bit integer truncation

Issue #18330 has been updated by ioquatix (Samuel Williams).

Status changed from Open to Closed

Thanks!

----------------------------------------
Bug #18330: Make failure on 32-bit Linux (Android) with Clang due to implicit 64-to-32-bit integer truncation
https://bugs.ruby-lang.org/issues/18330#change-95392

* Author: xtkoba (Tee KOBAYASHI)
* Status: Closed
* Priority: Normal
* Assignee: ioquatix (Samuel Williams)
* ruby -v: ruby 3.1.0dev (2021-11-11 master 84202963c5) [arm-linux-android]
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Observed in crossruby CI for armv7a-android30 (http://rubyci.s3.amazonaws.com/crossruby/crossruby-master-armv7a-android30/log/20211111T210030Z.log.html.gz):
  
```
compiling io_buffer.c
io_buffer.c:297:16: error: implicit conversion loses integer precision: 'off_t' (aka 'long long') to 'size_t' (aka 'unsigned int') [-Werror,-Wshorten-64-to-32]
        size = rb_file_size(io);
             ~ ^~~~~~~~~~~~~~~~
io_buffer.c:881:1: error: implicit conversion loses integer precision: 'uint64_t' (aka 'unsigned long long') to 'unsigned long' [-Werror,-Wshorten-64-to-32]
DECLAIR_TYPE(u64, uint64_t, RB_IO_BUFFER_LITTLE_ENDIAN, RB_ULONG2NUM, RB_NUM2ULONG, ruby_swap64)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
io_buffer.c:855:17: note: expanded from macro 'DECLAIR_TYPE'
    return wrap(value); \
           ~~~~ ^~~~~
io_buffer.c:882:1: error: implicit conversion loses integer precision: 'uint64_t' (aka 'unsigned long long') to 'unsigned long' [-Werror,-Wshorten-64-to-32]
DECLAIR_TYPE(U64, uint64_t, RB_IO_BUFFER_BIG_ENDIAN, RB_ULONG2NUM, RB_NUM2ULONG, ruby_swap64)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
io_buffer.c:855:17: note: expanded from macro 'DECLAIR_TYPE'
    return wrap(value); \
           ~~~~ ^~~~~
io_buffer.c:883:1: error: implicit conversion loses integer precision: 'int64_t' (aka 'long long') to 'long' [-Werror,-Wshorten-64-to-32]
DECLAIR_TYPE(s64, int64_t, RB_IO_BUFFER_LITTLE_ENDIAN, RB_LONG2NUM, RB_NUM2LONG, ruby_swap64)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
io_buffer.c:855:17: note: expanded from macro 'DECLAIR_TYPE'
    return wrap(value); \
           ~~~~ ^~~~~
io_buffer.c:884:1: error: implicit conversion loses integer precision: 'int64_t' (aka 'long long') to 'long' [-Werror,-Wshorten-64-to-32]
DECLAIR_TYPE(S64, int64_t, RB_IO_BUFFER_BIG_ENDIAN, RB_LONG2NUM, RB_NUM2LONG, ruby_swap64)
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
io_buffer.c:855:17: note: expanded from macro 'DECLAIR_TYPE'
    return wrap(value); \
           ~~~~ ^~~~~
5 errors generated.
gmake: *** [Makefile:435: io_buffer.o] Error 1
```



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