From: xtkoba+ruby@... Date: 2021-04-09T00:17:26+00:00 Subject: [ruby-core:103325] [Ruby master Bug#17788] ruby 3.0.0 - compiling c++ extension on alpine fails Issue #17788 has been updated by xtkoba (Tee KOBAYASHI). File ruby-ruby_nonempty_memcpy-musl-cxx.patch added Repro (named `bug17788.cc`): ```c #include <sys/types.h> //extern "C" { void * ruby_nonempty_memcpy(void *dest, const void *src, size_t n) { return dest; } //} #undef memcpy #define memcpy ruby_nonempty_memcpy #include <iostream> ``` ``` $ x86_64-unknown-linux-musl-g++ -c bug17788.cc bug17788.cc:13:16: error: conflicting declaration of 'void* ruby_nonempty_memcpy(void*, const void*, size_t)' with 'C' linkage 13 | #define memcpy ruby_nonempty_memcpy | ^~~~~~~~~~~~~~~~~~~~ bug17788.cc:6:1: note: previous declaration with 'C++' linkage 6 | ruby_nonempty_memcpy(void *dest, const void *src, size_t n) | ^~~~~~~~~~~~~~~~~~~~ ``` A patch is attached for a workaround which wraps up the definition of `ruby_nonempty_memcpy` with `extern "C" { ... }`. ---------------------------------------- Bug #17788: ruby 3.0.0 - compiling c++ extension on alpine fails https://bugs.ruby-lang.org/issues/17788#change-91415 * Author: memel (Maia Engeli) * Status: Open * Priority: Normal * ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-linux-musl] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN ---------------------------------------- Compiling gem with C++ extension fails on alpine 3xx with Ruby 3.0.0 and Ruby 3.0.1 (does not fail on Ubuntu 18 ��\\_(���)_/��) Error: ``` compiling testgem.cc In file included from /root/.rbenv/versions/3.0.0/include/ruby-3.0.0/ruby/ruby.h:39, from /root/.rbenv/versions/3.0.0/include/ruby-3.0.0/ruby.h:38, from testgem.cc:2: /root/.rbenv/versions/3.0.0/include/ruby-3.0.0/ruby/internal/memory.h:275:16: error: conflicting declaration of 'void* ruby_nonempty_memcpy(void*, const void*, size_t)' with 'C' linkage 275 | #define memcpy ruby_nonempty_memcpy | ^~~~~~~~~~~~~~~~~~~~ /root/.rbenv/versions/3.0.0/include/ruby-3.0.0/ruby/internal/memory.h:265:1: note: previous declaration with 'C++' linkage 265 | ruby_nonempty_memcpy(void *dest, const void *src, size_t n) | ^~~~~~~~~~~~~~~~~~~~ ``` Code for reproduction: extconf.rb ``` require 'mkmf' create_makefile 'testgem' ``` testgem.cc ``` #include <stdio.h> #include <ruby.h> #include <iostream> VALUE says(VALUE _self, VALUE str) { Check_Type(str, T_STRING); puts(StringValueCStr(str)); return Qnil; } void Init_testgem() { VALUE mod = rb_define_module("Simon"); const int num_args = 1; std::cout << "*** testgem initialized ***" << std::endl; rb_define_module_function(mod, "says", says, num_args); } ---Files-------------------------------- testgem.cc (394 Bytes) extconf.rb (41 Bytes) ruby-ruby_nonempty_memcpy-musl-cxx.patch (370 Bytes) -- https://bugs.ruby-lang.org/ Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe> <http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>