target conditional library search paths xcode

I'm trying to condtionally link in. .a static libraries开发者_如何学Go by defines. Is this possible in xcode? Basically trying to wrap library specific code in ifdefs so it can be excluded at compile time by setting flags.

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No, a C #define is not at the same level as library linkage.

However, you can set a C #define (via the Preprocessor Macros build setting) from the value of a custom build setting, like BUILT_WITH_FOO, and also set your OTHER_LDFLAGS build setting based on that custom build setting as well.

For example:

BUILT_WITH_FOO = foo

GCC_PREPROCESSOR_DEFINITIONS_ = USING_FOO=0
GCC_PREPROCESSOR_DEFINITIONS_foo = USING_FOO=1
GCC_PREPROCESSOR_DEFINITIONS = $(GCC_PREPROCESSOR_DEFINITIONS_$(BUILT_WITH_FOO))

OTHER_LDFLAGS_ = -lsomething
OTHER_LDFLAGS_foo = -lsomething -lfoo
OTHER_LDFLAGS = $(OTHER_LDFLAGS_$(BUILT_WITH_FOO))

The above would let you adjust only the value of the BUILT_WITH_FOO build setting to choose whether to use the Preprocessor Macros and Other Linker Flags variants whose names end with a trailing _, or the ones whose names end with a trailing _foo.