错误：调用未声明的函数“mysql_ssl_set”； ISO C99 及更高版本不支持隐式函数声明

Question

我正在努力

gem install mysql2

~/s/r/railties> gem install mysql2
Fetching mysql2-0.5.6.gem
Building native extensions. This could take a while...
ERROR:  Error installing mysql2:
    ERROR: Failed to build gem native extension.

    current directory: /Users/dorianmariefr/.asdf/installs/ruby/3.3.0/lib/ruby/gems/3.3.0/gems/mysql2-0.5.6/ext/mysql2
/Users/dorianmariefr/.asdf/installs/ruby/3.3.0/bin/ruby extconf.rb
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for rb_gc_mark_movable()... yes
checking for rb_wait_for_single_fd()... yes
checking for rb_enc_interned_str() in ruby.h... yes
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Using --with-openssl-dir=/opt/homebrew/opt/openssl@3
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Using mysql_config at /opt/homebrew/bin/mysql_config
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checking for mysql.h... yes
checking for errmsg.h... yes
checking for SSL_MODE_DISABLED in mysql.h... yes
checking for SSL_MODE_PREFERRED in mysql.h... yes
checking for SSL_MODE_REQUIRED in mysql.h... yes
checking for SSL_MODE_VERIFY_CA in mysql.h... yes
checking for SSL_MODE_VERIFY_IDENTITY in mysql.h... yes
checking for MYSQL.net.vio in mysql.h... yes
checking for MYSQL.net.pvio in mysql.h... no
checking for MYSQL_DEFAULT_AUTH in mysql.h... yes
checking for MYSQL_ENABLE_CLEARTEXT_PLUGIN in mysql.h... yes
checking for SERVER_QUERY_NO_GOOD_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_NO_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_WAS_SLOW in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_ON in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_OFF in mysql.h... yes
checking for my_bool in mysql.h... no
checking for mysql_ssl_set() in mysql.h... no
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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 /opt/homebrew/Cellar/mysql/8.3.0/lib
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creating Makefile

current directory: /Users/dorianmariefr/.asdf/installs/ruby/3.3.0/lib/ruby/gems/3.3.0/gems/mysql2-0.5.6/ext/mysql2
make DESTDIR\= sitearchdir\=./.gem.20240216-22567-u1f6tb sitelibdir\=./.gem.20240216-22567-u1f6tb clean

current directory: /Users/dorianmariefr/.asdf/installs/ruby/3.3.0/lib/ruby/gems/3.3.0/gems/mysql2-0.5.6/ext/mysql2
make DESTDIR\= sitearchdir\=./.gem.20240216-22567-u1f6tb sitelibdir\=./.gem.20240216-22567-u1f6tb
compiling client.c
In file included from client.c:15:
./mysql_enc_name_to_ruby.h:43:1: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
mysql2_mysql_enc_name_to_rb_hash (str, len)
^
./mysql_enc_name_to_ruby.h:86:1: warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]
mysql2_mysql_enc_name_to_rb (str, len)
^
2 warnings generated.
compiling infile.c
compiling mysql2_ext.c
compiling result.c
result.c:304:35: warning: implicit conversion loses integer precision: 'unsigned long' to 'int' [-Wshorten-64-to-32]
        precision = field->length - (field->decimals > 0 ? 2 : 1);
                  ~ ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
compiling statement.c
linking shared-object mysql2/mysql2.bundle
ld: library 'zstd' not found
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/dorianmariefr/.asdf/installs/ruby/3.3.0/lib/ruby/gems/3.3.0/gems/mysql2-0.5.6 for inspection.
Results logged to /Users/dorianmariefr/.asdf/installs/ruby/3.3.0/lib/ruby/gems/3.3.0/extensions/arm64-darwin-23/3.3.0/mysql2-0.5.6/gem_make.out

Answer 1

我做到了：

gem install mysql2 -- --with-cflags="-Wno-error=implicit-function-declaration"

然后我得到：

ld: library 'zstd' not found

所以我做到了：

gem install mysql2 -- --with-cflags="-Wno-error=implicit-function-declaration" --with-ldflags=-L/opt/homebrew/opt/zstd/lib

（macOS 索诺玛）

如果你想全局配置它：

bundle config build.mysql2 '-- --with-cflags="-Wno-error=implicit-function-declaration" --with-ldflags=-L/opt/homebrew/opt/zstd/lib'

在你的

~/.bundle/config

中你应该有类似的内容：

---
BUNDLE_BUILD__MYSQL2: "-- --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include"