[MacPorts] #61486: fluxbox @1.3.7_1 does not compile on macOS Big Sur, Version 11.0.1, because "src/FbTk/FbTime.cc:64:10: error: redefinition of '_mono'"

[MacPorts]

#61486: fluxbox @1.3.7_1 does not compile on macOS Big Sur, Version 11.0.1, because
"src/FbTk/FbTime.cc:64:10: error: redefinition of '_mono'"
------------------------+--------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.4
Resolution:             |   Keywords:  bigsur
      Port:  fluxbox    |
------------------------+--------------------

Comment (by ballapete):

 `src/FbTk/Font.cc` has:

 {{{
    28   #ifdef HAVE_CLOCK_GETTIME // linux|*bsd|solaris
    29   #include <time.h>
    30
    31   namespace {
    32
    33   uint64_t _mono() {
    34
    35       uint64_t t = 0L;
    36       timespec ts;
    37
    38       if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) {
    39           t = (ts.tv_sec * FbTk::FbTime::IN_SECONDS) + (ts.tv_nsec /
 1000L);
    40       }
    41
    42       return t;
    43   }
    44
    45   }
    46
    47   #endif // HAVE_CLOCK_GETTIME
    48
    49
    50
    51
    52
    53   #ifdef HAVE_MACH_ABSOLUTE_TIME // macosx
    54
    55   // http://stackoverflow.com/questions/5167269/clock-gettime-
 alternative-in-mac-os-x
    56   //
 https://github.com/ThomasHabets/monotonic_clock/blob/master/src/monotonic_mach.c
    57   // http://shiftedbits.org/2008/10/01/mach_absolute_time-on-the-
 iphone/
    58
    59
    60   #include <mach/mach_time.h>
    61
    62   namespace {
    63
    64   uint64_t _mono() {
    65
    66       // mach_absolute_time() * info.numer / info.denom yields
    67       // nanoseconds.
    68
    69       static double micro_scale = 0.001;  // 1000ms == 1ns
    70       static bool initial = true;
    71
    72       if (initial) {
    73           initial = false;
    74           mach_timebase_info_data_t info;
    75           if (mach_timebase_info(&info) == 0) {
    76               micro_scale *= static_cast<double>(info.numer) /
 static_cast<double>(info.denom);
    77           }
    78       }
    79
    80       return static_cast<uint64_t>(mach_absolute_time() *
 micro_scale);
    81   }
    82
    83   }
    84
    85   #endif // HAVE_MACH_ABSOLUTE_TIME
 }}}

 `config.log` has both:

 {{{
 #define HAVE_CLOCK_GETTIME 1
 #define HAVE_MACH_ABSOLUTE_TIME 1
 }}}

 or in `configure`'s output:

 {{{
 checking for strftime... yes
 checking for clock_gettime... yes
 checking for clock_gettime in -lrt... no
 checking for mach_absolute_time... yes
 }}}

 `clang` does

 {{{
 #define __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ 110000
 }}}

 so it's probably best to guard the first or the second function definition
 with this because presumingly CLOCK_GETTIME or MACH_ABSOLUTE_TIME has been
 introduced in Big Sur.

-- 
Ticket URL: <https://trac.macports.org/ticket/61486#comment:1>
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