Unable to install thin gem on macOS 11.0 Big Sur beta

[yahonda]

I'd like to know how to install thin gem on macOS 11.0 Big Sur beta.

• Background:
  I'm contributing to Ruby on Rails framework using my macOS. One of the Rails module Action Cable uses blade gem, it requires thin gem.

• Software versions

% sw_vers                                                                                                                                                                                                                   master
ProductName:	macOS
ProductVersion:	11.0
BuildVersion:	20A5323l
% ruby -v
ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-darwin20]
% gem -v
3.1.2
% cc -v
Apple clang version 12.0.0 (clang-1200.0.26.2)
Target: x86_64-apple-darwin20.0.0
Thread model: posix
InstalledDir: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

• gem install thin command results

% gem install thin
Building native extensions. This could take a while...
ERROR:  Error installing thin:
	ERROR: Failed to build gem native extension.

    current directory: /Users/yahonda/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/thin-1.7.2/ext/thin_parser
/Users/yahonda/.rbenv/versions/2.7.1/bin/ruby -I /Users/yahonda/.rbenv/versions/2.7.1/lib/ruby/2.7.0 -r ./siteconf20200730-33834-mbvks1.rb extconf.rb
checking for main() in -lc... yes
creating Makefile

current directory: /Users/yahonda/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/thin-1.7.2/ext/thin_parser
make "DESTDIR=" clean

current directory: /Users/yahonda/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/thin-1.7.2/ext/thin_parser
make "DESTDIR="
compiling parser.c
parser.c:31:18: warning: unused variable 'http_parser_en_main' [-Wunused-const-variable]
static const int http_parser_en_main = 1;
                 ^
1 warning generated.
compiling thin.c
thin.c:242:3: error: implicit declaration of function 'thin_http_parser_init' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  thin_http_parser_init(hp);
  ^
thin.c:242:3: note: did you mean 'http_parser_init'?
./parser.h:41:5: note: 'http_parser_init' declared here
int http_parser_init(http_parser *parser);
    ^
thin.c:260:3: error: implicit declaration of function 'thin_http_parser_init' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  thin_http_parser_init(http);
  ^
thin.c:277:3: error: implicit declaration of function 'thin_http_parser_init' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  thin_http_parser_init(http);
  ^
thin.c:294:3: error: implicit declaration of function 'thin_http_parser_finish' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  thin_http_parser_finish(http);
  ^
thin.c:294:3: note: did you mean 'Thin_HttpParser_finish'?
thin.c:290:7: note: 'Thin_HttpParser_finish' declared here
VALUE Thin_HttpParser_finish(VALUE self)
      ^
thin.c:296:10: error: implicit declaration of function 'thin_http_parser_is_finished' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  return thin_http_parser_is_finished(http) ? Qtrue : Qfalse;
         ^
thin.c:334:5: error: implicit declaration of function 'thin_http_parser_execute' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    thin_http_parser_execute(http, dptr, dlen, from);
    ^
thin.c:334:5: note: did you mean 'Thin_HttpParser_execute'?
thin.c:317:7: note: 'Thin_HttpParser_execute' declared here
VALUE Thin_HttpParser_execute(VALUE self, VALUE req_hash, VALUE data, VALUE start)
      ^
thin.c:338:8: error: implicit declaration of function 'thin_http_parser_has_error' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    if(thin_http_parser_has_error(http)) {
       ^
thin.c:338:8: note: did you mean 'http_parser_has_error'?
./parser.h:44:5: note: 'http_parser_has_error' declared here
int http_parser_has_error(http_parser *parser);
    ^
thin.c:359:10: error: implicit declaration of function 'thin_http_parser_has_error' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  return thin_http_parser_has_error(http) ? Qtrue : Qfalse;
         ^
thin.c:374:10: error: implicit declaration of function 'thin_http_parser_is_finished' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
  return thin_http_parser_is_finished(http) ? Qtrue : Qfalse;
         ^
9 errors generated.
make: *** [thin.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/yahonda/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/gems/thin-1.7.2 for inspection.
Results logged to /Users/yahonda/.rbenv/versions/2.7.1/lib/ruby/gems/2.7.0/extensions/x86_64-darwin-20/2.7.0/thin-1.7.2/gem_make.out

[yijia-zhan]

Catalina 10.15.6 has the exact same error:

$ sw_vers
ProductName:	Mac OS X
ProductVersion:	10.15.6
BuildVersion:	19G73

[yahonda]

Opened a pull request #366

[yahonda]

It should be addressed by #364.

[yahonda]

Closing because #364 has been merged to master branch.

[kellishaver]

If you're in a situation where you can't upgrade the gem, upgrading to XCode 11.7 will fix the error above.

Note that if you've previously installed stand-alone command line tools, you'll have to switch to the ones included with XCode via sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer

[ioquatix]

Do you want to make a PR to update the README with those details @kellishaver ?

[kellishaver]

Do you want to make a PR to update the README with those details @kellishaver ?

Would be happy to! I'll do this tonight.

[mszyndel]

Alternative solution that has worked for me was

gem install thin -v '1.6.4' -- --with-cflags="-Wno-error=implicit-function-declaration"

This didn't require me to install XCode, just Command Line Tools

[WillSewell]

If you are using bundle install, you will need to run

bundle config build.thin --with-cflags="-Wno-error=implicit-function-declaration"

[timohuovinen]

This also worked for me

gem install thin 1.6.4 -- --build-flags --with-cflags="-Wno-error=unused-const-variable"  

[ZASMan]

No luck with any of the solutions here for Monterey. Anyone else have this problem?

[hugocorbucci]

Just followed the suggestion from @mszyndel on Monterey and it worked just fine:

 gem install thin -v '1.6.4' -- --with-cflags="-Wno-error=implicit-function-declaration"

[aeberlin]

If anybody is struggling to get 1.6.4 installed on mac Big Sur and xcode 13.2.1 on a really old mac book, the cflags solution wasn't enough, due to this repeated error

error: '__declspec' attributes are not enabled

This was my solution, adding -fdeclspec to cppflags:

gem install thin -v '1.6.4' -- --with-cflags="-Wno-error=implicit-function-declaration" --with-cppflags="-fdeclspec"