From: shyouhei@... Date: 2018-06-05T00:21:41+00:00 Subject: [ruby-core:87399] [Ruby trunk Bug#14816] Extension build failure on a system with musl libc Issue #14816 has been updated by shyouhei (Shyouhei Urabe). Let me directly point out what is actually to be blamed: akamch (Anatoly Kamchatnov) wrote: > In file included from /usr/include/c++/7.3/math.h:36:0, > from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/missing.h:23, > from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/defines.h:153, > from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/ruby.h:29, > from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby.h:33, > from unf.cc:3: > /usr/include/c++/7.3/cmath:626:3: note: previous declaration 'constexpr bool std::isnan(double)' > isnan(double __x) > ^~~~~ This is wrong. Your C++ header file _does_ define a function named isnan. You have to include C's one (the one you referred) instead. ---------------------------------------- Bug #14816: Extension build failure on a system with musl libc https://bugs.ruby-lang.org/issues/14816#change-72383 * Author: akamch (Anatoly Kamchatnov) * Status: Open * Priority: Normal * Assignee: * Target version: * ruby -v: ruby 2.6.0preview2 (2018-05-31 trunk 63539) [x86_64-linux] * Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN ---------------------------------------- Some extensions fail to build on a Linux with musl (Void Linux). Build of unf_ext is an example. isinf() and isnan() are defined as macros in musl: https://git.musl-libc.org/cgit/musl/tree/include/math.h https://github.com/gliderlabs/docker-alpine/issues/261 "Cannot build native extensions for unf_ext gem" seems to be a related issue. ~~~ $ gem install unf_ext Building native extensions. This could take a while... ERROR: Error installing unf_ext: ERROR: Failed to build gem native extension. current directory: /home/rev/.gem/ruby/2.6.0/gems/unf_ext-0.0.7.5/ext/unf_ext /home/rev/.rbenv/versions/2.6.0-preview2/bin/ruby -r ./siteconf20180603-29655-wgzu56.rb extconf.rb checking for -lstdc++... yes creating Makefile current directory: /home/rev/.gem/ruby/2.6.0/gems/unf_ext-0.0.7.5/ext/unf_ext make "DESTDIR=" clean current directory: /home/rev/.gem/ruby/2.6.0/gems/unf_ext-0.0.7.5/ext/unf_ext make "DESTDIR=" compiling unf.cc cc1plus: warning: command line option '-Wimplicit-int' is valid for C/ObjC but not for C++ cc1plus: warning: command line option '-Wdeclaration-after-statement' is valid for C/ObjC but not for C++ cc1plus: warning: command line option '-Wimplicit-function-declaration' is valid for C/ObjC but not for C++ In file included from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/defines.h:153:0, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/ruby.h:29, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby.h:33, from unf.cc:3: /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/missing.h:172:29: error: 'int isinf(double)' conflicts with a previous declaration RUBY_EXTERN int isinf(double); ^ In file included from /usr/include/c++/7.3/math.h:36:0, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/missing.h:23, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/defines.h:153, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/ruby.h:29, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby.h:33, from unf.cc:3: /usr/include/c++/7.3/cmath:599:3: note: previous declaration 'constexpr bool std::isinf(double)' isinf(double __x) ^~~~~ In file included from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/defines.h:153:0, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/ruby.h:29, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby.h:33, from unf.cc:3: /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/missing.h:179:29: error: 'int isnan(double)' conflicts with a previous declaration RUBY_EXTERN int isnan(double); ^ In file included from /usr/include/c++/7.3/math.h:36:0, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/missing.h:23, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/defines.h:153, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby/ruby.h:29, from /home/rev/.rbenv/versions/2.6.0-preview2/include/ruby-2.6.0/ruby.h:33, from unf.cc:3: /usr/include/c++/7.3/cmath:626:3: note: previous declaration 'constexpr bool std::isnan(double)' isnan(double __x) ^~~~~ cc1plus: warning: unrecognized command line option '-Wno-cast-function-type' cc1plus: warning: unrecognized command line option '-Wno-self-assign' cc1plus: warning: unrecognized command line option '-Wno-constant-logical-operand' cc1plus: warning: unrecognized command line option '-Wno-parentheses-equality' make: *** [Makefile:211: unf.o] Error 1 make failed, exit code 2 ~~~ -- 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>