Postgresql gem install pg 0.18.4 passes, bundle install fails

Question

Mac OS El Capitan

Bundle install fails with:

compiling pg_connection.c pg_connection.c:2394:3: warning: implicit declaration of function 'gettimeofday' is invalid in C99 [-Wimplicit-function-declaration]                 gettimeofday(&currtime, NULL);                 ^ 1 warning generated. compiling pg_copy_coder.c compiling pg_errors.c compiling pg_result.c compiling pg_text_decoder.c compiling pg_text_encoder.c compiling pg_type_map.c compiling pg_type_map_all_strings.c compiling pg_type_map_by_class.c compiling pg_type_map_by_column.c compiling pg_type_map_by_mri_type.c compiling pg_type_map_by_oid.c compiling pg_type_map_in_ruby.c compiling util.c linking shared-object pg_ext.bundle ld: file not found: dynamic_lookup clang: error: linker command failed with exit code 1 (use -v to see invocation) make: *** [pg_ext.bundle] Error 1  make failed, exit code 2  Gem files will remain installed in /Users/jmintz/Documents/LaunchAngels/radar/vendor/bundle/gems/pg-0.18.4 for inspection. Results logged to /Users/jmintz/Documents/LaunchAngels/radar/vendor/bundle/extensions/x86_64-darwin-15/2.2.0-static/pg-0.18.4/gem_make.out 

... ...

An error occurred while installing pg (0.18.4), and Bundler cannot continue.  Make sure that `gem install pg -v '0.18.4'` succeeds before bundling. 

Running 'gem install pg -v '0.18.4' results in:

Building native extensions.  This could take a while... Successfully installed pg-0.18.4 Parsing documentation for pg-0.18.4 Done installing documentation for pg after 4 seconds 1 gem installed 

Yet running 'bundle install' again fails. Any suggestions? I've tried uninstalling and reinstalling postgresql with homebrew with no luck

Answer 1

I have got a similar error now on macOS Catalina, but I was not able to successfully run

gem install pg -v '0.18.4' 

I found this issue in the puma gem (I know this is another gem) that helped me solve the issue: https://github.com/puma/puma/issues/2304.

There, I found this:

Clang now enables -Werror=implicit-function-declaration by default:

Clang now reports an error when you use a function without an explicit declaration when building C or Objective-C code for macOS (-Werror=implicit-function-declaration flag is on). This additional error detection unifies Clang’s behavior for iOS/tvOS and macOS 64-bit targets for this diagnostic. (49917738)

And this:

gem install puma:4.3.5 -- --with-cflags="-Wno-error=implicit-function-declaration" 

So, I was able to build pg with:

gem install pg -v '0.18.1' -- --with-cflags="-Wno-error=implicit-function-declaration" 

Answer 2

The same issue has been faced with all the gems that rely on native extensions such as pg, puma, ffi, etc I have solved them by passing -- --with-cflags="-Wno-error=implicit-function-declaration"

ex:

• gem install pg -v '0.18.4' -- --with-cflags="-Wno-error=implicit-function-declaration"

• gem install ffi -v '1.12.2' -- --with-cflags="-Wno-error=implicit-function-declaration"

• gem install puma -v '4.3.1' -- --with-cflags="-Wno-error=implicit-function-declaration"