(autoconf.info)Objective C Compiler
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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 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.
-- Macro: AC_PROG_OBJCPP
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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