Re: [Mingw-users] Calling the 4.5.2-1 Objective-C Compiler

[Erik T. <eh....@gm...>]

2011/1/17 Nat! <na...@mu...>

> Hi
>
> My basic question is, how am I supposed to invoke the Objective-C compiler
> on MinGW?
>
> [...]
>
> C:\MinGW\bin>"mingw32-gcc.exe" -x objc c:\src\gcc_in_vs\gcc_in_vs\foo.m
> mingw32-gcc.exe: language objc not recognized
> mingw32-gcc.exe: language objc not recognized
> c:\src\gcc_in_vs\gcc_in_vs\foo.m: file not recognized: File format not
> recognize
> d
> collect2: ld returned 1 exit status
>
> And ObjC doesn't show up in the list of languages:
>
>  -x <language>            Specify the language of the following input files
>                          Permissible languages include: c c++ assembler
> none
>                          'none' means revert to the default behavior of
>                          guessing the language based on the file's
> extension
>
>

Looking at the online documentation shows that this list isn't exhaustive.
The correct option would be: -x objective-c

From
http://gcc.gnu.org/onlinedocs/gcc-4.5.2/gcc/Overall-Options.html#Overall-Options
(if all else fails, read the manual):

You can specify the input language explicitly with the -x option: -x
languageSpecify explicitly the language for the following input files
(rather than letting the compiler choose a default based on the file name
suffix). This option applies to all following input files until the
next -xoption. Possible values for
language are:

          c  c-header  c-cpp-output
          c++  c++-header  c++-cpp-output
          objective-c  objective-c-header  objective-c-cpp-output
          objective-c++ objective-c++-header objective-c++-cpp-output
          assembler  assembler-with-cpp
          ada
          f77  f77-cpp-input f95  f95-cpp-input
          java


-x noneTurn off any specification of a language, so that subsequent files
are handled according to their file name suffixes (as they are if -x has not
been used at all).

Erik.