Combining MRB_NO_BOXING, MRB_INT64, and MRB_USE_FLOAT32 on a 32-bit system causes a compilation error #6722

On FreeBSD 15 amd64 with cc -m32 or on 32-bit MinGW, combining MRB_NO_BOXING, MRB_INT64, and MRB_USE_FLOAT32 results in different compilation errors.

• mruby revision: commit 2031ae9

• cc -m32 on FreeBSD 15 amd64

  • build configuration (myconfig1.rb)

    MRuby::Lockfile.disable
    
    MRuby::Build.new do
      toolchain "gcc"
      cc.flags << "-m32"
      linker.flags << "-m32"
      defines << %w(MRB_NO_BOXING MRB_INT64 MRB_USE_FLOAT32)
    end

  • rake MRUBY_CONFIG=myconfig1.rb

    ...omitted...
    CC    src/gc.c -> build/host/mrbc/src/gc.o
    In file included from /var/tmp/mruby/src/gc.c:11:
    /var/tmp/mruby/src/gc.c: In function 'mrb_init_gc':
    /var/tmp/mruby/include/mruby.h:83:39: error: static assertion failed: "RVALUE size must be within 5 words"
       83 | # define mrb_static_assert2(exp, str) _Static_assert(exp, str)
          |                                       ^~~~~~~~~~~~~~
    /var/tmp/mruby/include/mruby.h:99:40: note: in definition of macro 'mrb_static_assert_expand'
       99 | # define mrb_static_assert_expand(...) __VA_ARGS__ /* for MSVC behaviour - https://stackoverflow.com/q/5530505 */
          |                                        ^~~~~~~~~~~
    /var/tmp/mruby/include/mruby.h:100:54: note: in expansion of macro 'mrb_static_assert2'
      100 | # define mrb_static_assert_selector(a, b, name, ...) name
          |                                                      ^~~~
    /var/tmp/mruby/include/mruby.h:109:30: note: in expansion of macro 'mrb_static_assert_selector'
      109 |     mrb_static_assert_expand(mrb_static_assert_selector(__VA_ARGS__, mrb_static_assert2, mrb_static_assert1, _)(__VA_ARGS__))
          |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~
    /var/tmp/mruby/include/mruby/object.h:41:3: note: in expansion of macro 'mrb_static_assert'
       41 |   mrb_static_assert(sizeof(st) <= sizeof(void*) * 5, \
          |   ^~~~~~~~~~~~~~~~~
    /var/tmp/mruby/src/gc.c:1597:3: note: in expansion of macro 'mrb_static_assert_object_size'
     1597 |   mrb_static_assert_object_size(RVALUE);
          |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    rake aborted!
    Command failed with status (1): [gcc -MMD -c -std=gnu99 -g -O3 -Wall -Wundef -Werror-implicit-function-declaration -Wwrite-strings -m32 -DMRB_NO_GEMS -DMRB_NO_BOXING -DMRB_INT64 -DMRB_USE_FLOAT32 -I"/var/tmp/mruby/include" -I"/var/tmp/mruby/build/host/mrbc/include" -o "/var/tmp/mruby/build/host/mrbc/src/gc.o" "/var/tmp/mruby/src/gc.c"]
    /var/tmp/mruby/lib/mruby/build/command.rb:33:in 'MRuby::Command#_run'
    /var/tmp/mruby/lib/mruby/build/command.rb:95:in 'MRuby::Command::Compiler#run'
    /var/tmp/mruby/lib/mruby/build/command.rb:120:in 'block (2 levels) in MRuby::Command::Compiler#define_rules'
    Tasks: TOP => default => all => gensym => /var/tmp/mruby/build/host/presym => /var/tmp/mruby/build/host/mrblib/mrblib.pi => /var/tmp/mruby/build/host/mrblib/mrblib.c => /var/tmp/mruby/build/host/mrbc/bin/mrbc => /var/tmp/mruby/build/host/mrbc/lib/libmruby_core.a => /var/tmp/mruby/build/host/mrbc/src/gc.o
    (See full trace by running task with --trace)
    

• mingw32-gcc on FreeBSD 15 amd64

  • build configuration (myconfig2.rb)

    MRuby::Lockfile.disable
    
    MRuby::CrossBuild.new("mingw32") do
      toolchain "gcc"
      cc.command = "mingw32-gcc"
      linker.command = "mingw32-gcc"
      defines << %w(MRB_NO_BOXING MRB_INT64 MRB_USE_FLOAT32)
    end

  • rake MRUBY_CONFIG=myconfig2.rb

    ...omitted...
    CC    src/array.c -> build/mingw32/src/array.o
    In file included from /var/tmp/mruby/src/array.c:7:0:
    /var/tmp/mruby/include/mruby.h:83:39: error: static assertion failed: "MRB_ARY_EMBED_LEN_MAX > 0"
     # define mrb_static_assert2(exp, str) _Static_assert(exp, str)
                                           ^
    /var/tmp/mruby/include/mruby.h:99:40: note: in definition of macro 'mrb_static_assert_expand'
     # define mrb_static_assert_expand(...) __VA_ARGS__ /* for MSVC behaviour - https://stackoverflow.com/q/5530505 */
                                            ^
    /var/tmp/mruby/include/mruby.h:100:54: note: in expansion of macro 'mrb_static_assert2'
     # define mrb_static_assert_selector(a, b, name, ...) name
                                                          ^
    /var/tmp/mruby/include/mruby.h:109:30: note: in expansion of macro 'mrb_static_assert_selector'
         mrb_static_assert_expand(mrb_static_assert_selector(__VA_ARGS__, mrb_static_assert2, mrb_static_assert1, _)(__VA_ARGS__))
                                  ^
    /var/tmp/mruby/include/mruby/array.h:31:1: note: in expansion of macro 'mrb_static_assert'
     mrb_static_assert(MRB_ARY_EMBED_LEN_MAX > 0, "MRB_ARY_EMBED_LEN_MAX > 0");
     ^
    rake aborted!
    Command failed with status (1): [mingw32-gcc -MMD -c -std=gnu99 -g -O3 -Wall -Wundef -Werror-implicit-function-declaration -Wwrite-strings -DMRB_NO_GEMS -DMRB_NO_BOXING -DMRB_INT64 -DMRB_USE_FLOAT32 -I"/var/tmp/mruby/include" -I"/var/tmp/mruby/build/mingw32/include" -o "/var/tmp/mruby/build/mingw32/src/array.o" "/var/tmp/mruby/src/array.c"]
    /var/tmp/mruby/lib/mruby/build/command.rb:33:in 'MRuby::Command#_run'
    /var/tmp/mruby/lib/mruby/build/command.rb:95:in 'MRuby::Command::Compiler#run'
    /var/tmp/mruby/lib/mruby/build/command.rb:120:in 'block (2 levels) in MRuby::Command::Compiler#define_rules'
    /var/tmp/mruby/Rakefile:48:in 'block in <top (required)>'
    Tasks: TOP => build => /var/tmp/mruby/build/mingw32/lib/libmruby_core.a => /var/tmp/mruby/build/mingw32/src/array.o
    (See full trace by running task with --trace)