概要
我有一个小的 c 程序,它是一个标准的“hello world”应用程序来测试我可以相应地访问 mysql 连接驱动程序:
#include <stdio.h>
#include "mysql.h"
int main(int argc, const char **argv)
{
printf("MySQL client version: %s\n", mysql_get_client_info());
return 0;
}
当我使用以下内容编译它时;我收到一个错误:
gcc src/main.c \
-Wall \
-Ilib/mysql-connector-c-6.1.11-macos10.12-x86_64/include \
-o bin/test
架构 x86_64 的未定义符号:“_mysql_get_client_info”,引用自:main-59d4fb.o 中的 _main ld:未找到架构 x86_64 的符号:错误:链接器命令失败,退出代码为 1(使用 -v 查看调用)
然后我尝试将mysql与以下链接:
gcc src/main.c \
-Wall \
-Ilib/mysql-connector-c-6.1.11-macos10.12-x86_64/include \
-Llib/mysql-connector-c-6.1.11-macos10.12-x86_64/mysql-connector-c-6.1.11-src/libmysql \
-lmysql \
-o bin/test
ld:找不到-lmysql clang的库:错误:链接器命令失败,退出代码为1(使用-v查看调用)
值得注意的是,我使用的是c而不是 c++,而且我使用的不是XCode,只是 Vim,gcc
如上所示。
另类尝试
然后我决定也许我从 MySQL这个特定的链接编译源代码做错了,所以我删除了lib
我的应用程序中的目录并通过自制软件安装了它们:
我试过了,尽管相应地更改了新路径并且发生了完全相同的问题brew install mysql-connector-c
,但我也收到了与上述相同的错误。-I -L -l
/usr/local/Cellar/...
结论
.c
我在任何已编译的 mysql 库中都找不到任何文件,我确实libmysql
在我编译的源代码中找到了一个并尝试链接也失败的源代码。我个人觉得这是一个链接问题,我只是不知道是什么或如何,如果有人可以帮助我解决这个问题,我将不胜感激。
任何可能想查看回复的人-v
请参阅以下内容:
Apple LLVM version 9.0.0 (clang-900.0.39.2)
Target: x86_64-apple-darwin17.3.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" -cc1 -triple x86_64-apple-macosx10.13.0 -Wdeprecated-objc-isa-usage -Werror=deprecated-objc-isa-usage -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names -main-file-name main.c -mrelocation-model pic -pic-level 2 -mthread-model posix -mdisable-fp-elim -fno-strict-return -masm-verbose -munwind-tables -target-cpu penryn -target-linker-version 305 -v -dwarf-column-info -debugger-tuning=lldb -resource-dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -I lib/mysql-connector-c-6.1.11-macos10.12-x86_64/include -I/usr/local/include -Wall -fdebug-compilation-dir /Users/ash/Projects/samp-db2 -ferror-limit 19 -fmessage-length 173 -stack-protector 1 -fblocks -fobjc-runtime=macosx-10.13.0 -fencode-extended-block-signature -fmax-type-align=16 -fdiagnostics-show-option -fcolor-diagnostics -o /var/folders/v7/_rm0d0qx2r32ln2f7_dpnrw40000gn/T/main-3d5e25.o -x c src/main.c
clang -cc1 version 9.0.0 (clang-900.0.39.2) default target x86_64-apple-darwin17.3.0
ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/local/include"
ignoring nonexistent directory "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/Library/Frameworks"
#include "..." search starts here:
#include <...> search starts here:
lib/mysql-connector-c-6.1.11-macos10.12-x86_64/include
/usr/local/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0/include
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/include
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/System/Library/Frameworks (framework directory)
End of search list.
"/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ld" -demangle -lto_library /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/libLTO.dylib -no_deduplicate -dynamic -arch x86_64 -macosx_version_min 10.13.0 -syslibroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -o bin/cmig /var/folders/v7/_rm0d0qx2r32ln2f7_dpnrw40000gn/T/main-3d5e25.o -L/usr/local/lib -lSystem /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/9.0.0/lib/darwin/libclang_rt.osx.a