[Bug c/95011] New: Error building gcc 10.1.0 on macOS Catalina with Xcode 11.4.1

[Bug c/95011] New: Error building gcc 10.1.0 on macOS Catalina with Xcode 11.4.1

[mario_grgic at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95011

            Bug ID: 95011
           Summary: Error building gcc 10.1.0 on macOS Catalina with Xcode
                    11.4.1
           Product: gcc
           Version: 10.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mario_grgic at hotmail dot com
  Target Milestone: ---

Created attachment 48484
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48484&action=edit
config.log

I am attempting to build gcc 10.1.0 from source with Xcode 11.4.1 on macOS
Catalina 10.15.4.

I configure the build as follows: 

export PREFIX=/usr/local

../configure --prefix=${PREFIX} --with-gmp=${PREFIX} --with-mpfr=${PREFIX}
--with-mpc=${PREFIX} --with-isl-prefix=${PREFIX} --with-cloog=${PREFIX}
--enable-checking=release --enable-languages=c,c++,fortran
--with-build-sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk 


But this eventually leads to: 

/lib/cpp
configure: error: in `/Volumes/ramdisk/gcc-10.1.0/build/gcc':
configure: error: C++ preprocessor "/lib/cpp" fails sanity check
See `config.log' for more details

...

config.status: executing default commands
make[1]: *** [stage2-bubble] Error 2
make: *** [all] Error 2


config.log is attached.

In the config.log I see:

xgcc: error: unrecognized command-line option '-V'

and 

xgcc: error: unrecognized command-line option '-qversion'; did you mean
'--version'?


But more importantly:

/Volumes/ramdisk/gcc-10.1.0/build/prev-gcc/include-fixed/limits.h:195:15: fatal
error: limits.h: No such file or directory

[Bug c/95011] Error building gcc 10.1.0 on macOS Catalina with Xcode 11.4.1

[mario_grgic at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95011

--- Comment #1 from mario_grgic at hotmail dot com ---
It looks like this is configuration error. --with-sysroot and
--with-native-system-header-dir must both be specified when building on macOS.
However, configure --help does not list or document either of them.

[Bug c/95011] Error building gcc 10.1.0 on macOS Catalina with Xcode 11.4.1

[mario_grgic at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95011

mario_grgic at hotmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #2 from mario_grgic at hotmail dot com ---
Closing as invalid.