Apple Darwin User Manual download pdf (Page 34)

If you want to specify additional per-architecture compiler flags, you can use the PER_ARCH_CFLAGS_<arch>

family of build settings, where <arch> is the name of the architecture. For example, to specify compiler flags

that apply only to 64-bit Intel compilation, add them to the PER_ARCH_CFLAGS_x86_64 build setting.

For example, if you want to make your 64-bit slice run only on OS X v10.6 instead of v10.5, you could set a

per-architecture value for “OS X Deployment Target”:

●

Click the target and choose “Get Info” from the File menu.

●

Click “OS X Deployment Target”.

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Click the gear at the lower left corner of the info window and choose “Add Build Condition Setting” from

the resulting pop-up menu.

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Change the architecture to “Intel 64-bit” and specify the x86-64 setting for this option.

●

Add additional conditions as needed for additional architectures.

●

Change the main setting (above the constrained settings) to whatever you want the default value to be.

Compiling 64-Bit Code

Using Architecture-Specific Flags

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Apple Darwin User Manual Page 34