(autoconf.info)Objective C Compiler

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5.10.5 Objective C Compiler Characteristics

     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 the GNU Objective C compiler, set shell variable `GOBJC'
     to `yes'.  If output variable `OBJCFLAGS' was not already set, set
     it to `-g -O2' for the GNU Objective C compiler (`-O2' on systems
     where `gcc' 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, `/lib/cpp' is used.

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