mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
06aafeb4b3
Building certain ruby gem native extensions (such as thrift), with clang
12.0.0 or later fails, because they have -Werror in their CFLAGS,
resulting in complaints about the expansion of the `rb_intern()` macro:
```
current directory: /wrkdirs/usr/ports/devel/rubygem-thrift/work/stage/usr/local/lib/ruby/gems/2.7/gems/thrift-0.14.0/ext
make "DESTDIR="
compiling binary_protocol_accelerated.c
binary_protocol_accelerated.c:404:68: error: '(' and '{' tokens introducing statement expression appear in different macro expansion contexts [-Werror,-Wcompound-token-split-by-macro]
VALUE thrift_binary_protocol_class = rb_const_get(thrift_module, rb_intern("BinaryProtocol"));
^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/ruby-2.7/ruby/ruby.h:1847:23: note: expanded from macro 'rb_intern'
__extension__ (RUBY_CONST_ID_CACHE((ID), (str))) : \
^
binary_protocol_accelerated.c:404:68: note: '{' token is here
VALUE thrift_binary_protocol_class = rb_const_get(thrift_module, rb_intern("BinaryProtocol"));
^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/ruby-2.7/ruby/ruby.h:1847:24: note: expanded from macro 'rb_intern'
__extension__ (RUBY_CONST_ID_CACHE((ID), (str))) : \
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/local/include/ruby-2.7/ruby/ruby.h:1832:5: note: expanded from macro 'RUBY_CONST_ID_CACHE'
{ \
^
```
Part of the `rb_intern()` macro expands to `(RUBY_CONST_ID_CACHE((ID),
(str)))`, and in turn `RUBY_CONST_ID_CACHE()` expands to a brace
enclosed compound statement. The intended effect is to get a gcc
statement expression, which is normally delimited by `({ ... })`.
However, clang 12.0.0 and later have a warning enabled by default, about
pasting together the `(` and `{` tokens via different macros (see
<
|
||
|---|---|---|
| .. | ||
| backward | ||
| assert.h | ||
| backward.h | ||
| debug.h | ||
| defines.h | ||
| encoding.h | ||
| intern.h | ||
| io.h | ||
| missing.h | ||
| onigmo.h | ||
| oniguruma.h | ||
| re.h | ||
| regex.h | ||
| ruby.h | ||
| st.h | ||
| subst.h | ||
| thread.h | ||
| thread_native.h | ||
| util.h | ||
| version.h | ||
| vm.h | ||
| win32.h | ||