An error occurred while installing puma (4.3.5), and Bundler cannot continue. Make sure that gem install puma -v '4.3.5' --source 'https://rubygems.org/' succeeds before bundling.

[chinomnsoawazie]

Describe the bug
bundle install fails at Puma when it tries installing with 4.3.5.

Works: gem install puma -v '4.2.1'
Works: bundle config build.puma --with-cflags="-Wno-error=implicit-function-declaration"

Fails: gem install puma -v '4.3.5' or gem install puma' or bundle install

Error
I tried doing this in the three ways shown below without success

gem install puma
gem install puma -v '4.3.5'
gem install puma -v '4.3.0' -- --with-ldflags=-L/usr/local/opt/openssl@1.1/lib --with-cppflags=-I/usr/local/opt/openssl@1.1/include

`myname@myname-MacBook-Pro dogstagram_backend % gem install puma -v '4.3.5'
Building native extensions. This could take a while...
ERROR: Error installing puma:
ERROR: Failed to build gem native extension.

current directory: /Users/myname/.rvm/gems/ruby-2.7.0/gems/puma-4.3.5/ext/puma_http11

/Users/myname/.rvm/rubies/ruby-2.7.0/bin/ruby -I /Users/myname/.rvm/rubies/ruby-2.7.0/lib/ruby/2.7.0 -r ./siteconf20200818-2698-1vppb86.rb extconf.rb
checking for BIO_read() in -lcrypto... yes
checking for SSL_CTX_new() in -lssl... yes
checking for openssl/bio.h... yes
checking for DTLS_method() in openssl/ssl.h... yes
checking for TLS_server_method() in openssl/ssl.h... yes
checking for SSL_CTX_set_min_proto_version in openssl/ssl.h... yes
creating Makefile

current directory: /Users/myname/.rvm/gems/ruby-2.7.0/gems/puma-4.3.5/ext/puma_http11
make "DESTDIR=" clean

current directory: /Users/myname/.rvm/gems/ruby-2.7.0/gems/puma-4.3.5/ext/puma_http11
make "DESTDIR="
compiling http11_parser.c
ext/puma_http11/http11_parser.c:44:18: warning: unused variable 'puma_parser_en_main' [-Wunused-const-variable]
static const int puma_parser_en_main = 1;
^
1 warning generated.
compiling io_buffer.c
compiling mini_ssl.c
mini_ssl.c:145:7: warning: unused variable 'min' [-Wunused-variable]
int min, ssl_options;
^
mini_ssl.c:299:40: warning: function 'raise_error' could be declared with attribute 'noreturn' [-Wmissing-noreturn]
void raise_error(SSL* ssl, int result) {
^
2 warnings generated.
compiling puma_http11.c
puma_http11.c:203:22: error: implicitly declaring library function 'isspace' with type 'int (int)' [-Werror,-Wimplicit-function-declaration]
while (vlen > 0 && isspace(value[vlen - 1])) vlen--;
^
puma_http11.c:203:22: note: include the header <ctype.h> or explicitly provide a declaration for 'isspace'
1 error generated.
make: *** [puma_http11.o] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/myname/.rvm/gems/ruby-2.7.0/gems/puma-4.3.5 for inspection.
Results logged to /Users/myname/.rvm/gems/ruby-2.7.0/extensions/x86_64-darwin-19/2.7.0/puma-4.3.5/gem_make.out`

Expected behavior
bundle install, gem install puma -v '4.3.5' or gem install puma should install puma

Desktop (please complete the following information):

• OS: macOS Catalina version 10.15.6
• Puma Version 4.3.5

[k0kubun]

I reproduced the same issue. It seems that puma v4.2.1 doesn't have the issue but v4.3.0+ does. And indeed the isspace was added in v4.2.1...v4.3.0.

Though I think it's been fixed in befe00a.

[dentarg]

Yeah, this has been reported previously in #2304

There is an pull request, #2314, to fix this for the 4.x series

[justindonnaruma]

A simple workaround is here.

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

Pulled out from the PR mentioned above.

[nateberkopec]

Thanks for the report, duplicate of #2304

[aljorhythm]

A simple workaround is here.

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

Pulled out from the PR mentioned above.

The whole line here without config
gem install puma -v '4.3.0' -- --with-ldflags=-L/usr/local/opt/openssl@1.1/lib --with-cppflags=-I/usr/local/opt/openssl@1.1/include --with-cflags="-Wno-error=implicit-function-declaration"

[nateberkopec]

This was fixed in 4.3.6.