I'm trying to install mysql2 gem (0.4.5) on macOS Sierra (10.12.1) and getting the error. I don't have local mysql server, it's remote.
Here is error log:
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
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Using mysql_config at /usr/local/bin/mysql_config
-----
checking for mysql.h... yes
checking for errmsg.h... yes
checking for mysqld_error.h... yes
-----
Don't know how to set rpath on your system, if MySQL libraries are not in path mysql2 may not load
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Setting libpath to /usr/local/Cellar/mysql-connector-c/6.1.9/lib
-----
creating Makefile
To see why this extension failed to compile, please check the mkmf.log which can be found here:
/Users/user/.rbenv/versions/2.3.4/lib/ruby/gems/2.3.0/extensions/x86_64-darwin-16/2.3.0-static/mysql2-0.4.4/mkmf.log
current directory: /Users/user/.rbenv/versions/2.3.4/lib/ruby/gems/2.3.0/gems/mysql2-0.4.4/ext/mysql2
make "DESTDIR=" clean
current directory: /Users/user/.rbenv/versions/2.3.4/lib/ruby/gems/2.3.0/gems/mysql2-0.4.4/ext/mysql2
make "DESTDIR="
compiling client.c
compiling infile.c
compiling mysql2_ext.c
compiling result.c
compiling statement.c
linking shared-object mysql2/mysql2.bundle
ld: library not found for -l-lpthread
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1
make failed, exit code 2
Did anyone meet similar error?
Fix:
Edit /usr/local/Cellar/mysql-connector-c/6.1.10/bin/mysql_config
, find this line:
libs="$libs -l "
and change it to
libs="$libs -l mysqlclient "
Explanation:
-l-lpthread
The linker does not understand the option -l-lpthread
. Two -l-l
linker options are jammed up against each other. It is because the library name mysqlclient
is missing from the generated make file.
I ran into this issue when trying to build the native extensions for the mysql2
gem on Ruby 2.4.1 using the mysql-connector-c
from Home Brew
This was on MacOS 10.12.5.
The generated LIBS
variable should look something this:
LIBS = $(LIBRUBYARG_SHARED) -L/usr/local/Cellar/mysql-connector-c/6.1.10/lib -l mysqlclient -lpthread -ldl -lobjc
It appears the variable is expanded from the file /usr/local/Cellar/mysql-connector-c/6.1.10/bin/mysql_config
The libs
var in the file mysql_config
should contain:
libs="$libs -l mysqlclient "
instead of
libs="$libs -l "
The var embedded_libs
may be wrong too?
The mysql-connector-c
lib installs and build fine via Home Brew
it just appears the file mysql_config
is incorrect or generated incorrectly.
Not sure the cause of the issue. Possibly Home Brew
, mysql-connector-c
, mysql2 gem build process, user environment?
The issue is that you're missing a library as the error message indicates
ld: library not found for -l-lpthread
EDIT: There seem to be other errors related that may be fixed with the instructions below, namely:
ld: library not found for -lssl
My guess is that you did not install xcode yet which happens to install a few more libraries. Please make sure to install xcode through the official app-store.
It might be necessary to re-install the command-line tools again as well (even if you had xcode installed and just updated it at some point).
xcode-select --install
Let me know if this helped!
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