[MacPorts] #70331: gcc14 (c++) can not compile trivial program

[MacPorts]

#70331: gcc14 (c++) can not compile trivial program
----------------------+--------------------
  Reporter:  acmaggs  |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:
      Port:  gcc14    |
----------------------+--------------------

Comment (by szhorvat):

 I can't compile any C program that includes `<math.h>`. I'm not sure if
 it's the same issue. Example:

 {{{
 // x.c
 #include <math.h>

 int main(void) { return 0; }
 }}}

 `gcc-mp-14 x.c`

 The problem is not present with GCC 13.

 There are pages of errors that start with:

 {{{
 /opt/local/lib/gcc14/gcc/arm64-apple-darwin23/14.1.0/include-
 fixed/math.h:604:67: error: macro "__API_AVAILABLE2" requires 3 arguments,
 but only 2 given
   604 | extern float __exp10f(float) __API_AVAILABLE(macos(10.9),
 ios(7.0));
       |
 ^
 In file included from
 /Library/Developer/CommandLineTools/SDKs/MacOSX14.sdk/usr/include/Availability.h:177,
                  from /opt/local/lib/gcc14/gcc/arm64-apple-darwin23/14.1.0
 /include-fixed/math.h:47:
 /opt/local/lib/gcc14/gcc/arm64-apple-darwin23/14.1.0/include-
 fixed/AvailabilityInternal.h:255:13: note: macro "__API_AVAILABLE2"
 defined here
   255 |     #define __API_AVAILABLE2(arg0,arg1,arg2) __API_A(arg0)
 __API_A(arg1) __API_A(arg2)
       |             ^~~~~~~~~~~~~~~~
 /opt/local/lib/gcc14/gcc/arm64-apple-darwin23/14.1.0/include-fixed/math.h:
 In function '__exp10f':
 /opt/local/lib/gcc14/gcc/arm64-apple-darwin23/14.1.0/include-
 fixed/math.h:604:30: error: expected declaration specifiers before
 '__API_AVAILABLE2'
   604 | extern float __exp10f(float) __API_AVAILABLE(macos(10.9),
 ios(7.0));
       |                              ^~~~~~~~~~~~~~~

 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/70331#comment:22>
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