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5.10.5 Objective C Compiler Characteristics

Macro: AC_PROG_OBJC ([compiler-search-list])

Determine an Objective C compiler to use. If OBJC is not already set in the environment, check for Objective C compilers. Set output variable OBJC to the name of the compiler found.

This macro may, however, be invoked with an optional first argument which, if specified, must be a blank-separated list of Objective C compilers to search for. This just gives the user an opportunity to specify an alternative search list for the Objective C compiler. For example, if you didn’t like the default order, then you could invoke AC_PROG_OBJC like this:

AC_PROG_OBJC([gcc objcc objc])

If using a compiler that supports GNU Objective C, set shell variable GOBJC to ‘yes’. If output variable OBJCFLAGS was not already set, set it to -g -O2 for a GNU Objective C compiler (-O2 on systems where the compiler does not accept -g), or -g for other compilers.


Set output variable OBJCPP to a command that runs the Objective C preprocessor. If ‘$OBJC -E’ doesn’t work, tries cpp and /lib/cpp, in that order. Because of this fallback, CXXCPP may or may not set Objective-C-specific predefined macros (such as __OBJC__).