Compile mac cross toolchain on linux

[欧阳春晖 via Gcc-help <gcc-help@xxxxxxxxxxx>]

hello everyone

I'm looking for a way to build a mac cross toolchain on Linux, I want to 
use GNU GCC, but when I compile with the following command:


```

contrib/download_prerequisites

*./configure --target=x86_64-apple-darwin 
--prefix=/usr/x86_64-apple-darwin/usr 
--with-build-sysroot=/usr/x86_64-apple-darwin 
--program-prefix=x86_64-apple-darwin
*

*make*

```


However the following error occurs when compiling:


```

configure:3560: $? = 1
configure:3576: 
/home/jack/osxcross/gcc/host-x86_64-pc-linux-gnu/gcc/xgcc 
-B/home/jack/osxcross/gcc/host-x86_64-pc-linux-gnu/gcc/ 
-B/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/bin/ 
-B/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/lib/ -isystem 
/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/include -isystem 
/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/sys-include 
--sysroot=/usr/x86_64-apple-darwin   -o conftest -g -O2 conftest.c  >&5
In file included from conftest.c:9:
/home/jack/osxcross/gcc/host-x86_64-pc-linux-gnu/gcc/include-fixed/stdio.h:78:10: 
fatal error: _stdio.h: No such file or directory
   78 | #include <_stdio.h>
      |          ^~~~~~~~~~
compilation terminated.
configure:3579: $? = 1
configure:3792: checking for suffix of object files
configure:3814: 
/home/jack/osxcross/gcc/host-x86_64-pc-linux-gnu/gcc/xgcc 
-B/home/jack/osxcross/gcc/host-x86_64-pc-linux-gnu/gcc/ 
-B/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/bin/ 
-B/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/lib/ -isystem 
/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/include -isystem 
/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/sys-include 
--sysroot=/usr/x86_64-apple-darwin   -c -g -O2  conftest.c >&5
rch: invalid option -- 'f'
Try 'rch --help' for more information.
configure:3818: $? = 1
configure: failed program was:
| /* confdefs.h */
| #define PACKAGE_NAME "GNU C Runtime Library"
| #define PACKAGE_TARNAME "libgcc"
| #define PACKAGE_VERSION "1.0"
| #define PACKAGE_STRING "GNU C Runtime Library 1.0"
| #define PACKAGE_BUGREPORT ""
| #define PACKAGE_URL "http://www.gnu.org/software/libgcc/";
| /* end confdefs.h.  */
|
| int
| main ()
| {
|
|   ;
|   return 0;
| }
configure:3832: error: in 
`/home/jack/osxcross/gcc/x86_64-apple-darwin/libgcc':
configure:3834: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details

## ---------------- ##
## Cache variables. ##
## ---------------- ##

```


when I do the following:


```

/home/jack/osxcross/gcc/host-x86_64-pc-linux-gnu/gcc/xgcc 
-B/home/jack/osxcross/gcc/host-x86_64-pc-linux-gnu/gcc/ 
-B/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/bin/ 
-B/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/lib/ -isystem 
/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/include -isystem 
/usr/x86_64-apple-darwin/usr/x86_64-apple-darwin/sys-include 
--sysroot=/usr/x86_64-apple-darwin ~/main.c -isystem /usr/include

```


error output:


```

rch: invalid option -- 'f'
Try 'rch --help' for more information.

```


Did I make any mistake? if so please let me know

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