[ruby-core:88201] [Ruby trunk Bug#14816] Extension build failure on a system with musl libc

Issue #14816 has been updated by usa (Usaku NAKAMURA).

Backport changed from 2.3: REQUIRED, 2.4: REQUIRED, 2.5: REQUIRED to 2.3: REQUIRED, 2.4: DONE, 2.5: REQUIRED

ruby_2_4 r64126 merged revision(s) 63571,63572.

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Bug #14816: Extension build failure on a system with musl libc
https://bugs.ruby-lang.org/issues/14816#change-73220

* Author: akamch (Anatoly Kamchatnov)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.0preview2 (2018-05-31 trunk 63539) [x86_64-linux]
* Backport: 2.3: REQUIRED, 2.4: DONE, 2.5: REQUIRED
----------------------------------------
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

~~~



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