在静态库（MAC OS X.8.4，Xcode 4.6.3）中链接Mysqllib

Question

i´m often using the mysql c api and therefore linking them into my c projects, developed unter xcode.

Yesterday i tried to build up a static library to encapsulate some db functions.

But if i try to build the lib there occur some strange errors:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: can't locate file for: -lm
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file: -lm is not an object file (not allowed in a library)
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: can't locate file for: -lz
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file: -lz is not an object file (not allowed in a library)
Command /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool failed with exit code 1

to include the mysqllib under xcode it is necessary to add the following line to the build set-ip "other linker flags":

-lmysqlclient -lm -lz

As far is i understand xcode is not able to use this linker flags within a static library.

With a normal command line programm it works fine and i use it since years.

Does anyone has a hint for me how to deal with this issue?

Thanks in advance

solick

Answer 1

I getting similar error on XCode 5 while replacing old external libraries with newer iOS7-ready version.

ie:
...can't locate file for: -l
...is not an object file (not allowed in a library)

I discovered Xcode5 incorrectly escaping double-quote while inserting library search path to project.pbxproj .

ie: 

incorrect behaviour ---> "\\\"/path/library/\\\"",   (note: 3 slashes)
correct behaviour  ----> "\"/path/library/\"",       (note: 1 slash)

solution

Opening up project.pbxproj and doing a search and replace quickly fixed my problem.

ie: search(\\\) replace with (\)

Answer 2

解决了我的问题：在对我有用的主程序中包含了mysql lib。