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'"

[ballapete (Peter "Pete" Dyballa)]

mv -f src/FbTk/.deps/libFbTk_a-AutoReloadHelper.Tpo src/FbTk/.deps/libFbTk_a-AutoReloadHelper.Po
/usr/bin/clang++ -DHAVE_CONFIG_H -I.  -I/opt/local/include/freetype2 -I/opt/local/include/libpng16 -I/opt/local/include/fribidi -include ./config.h -I./src -I./src -I./nls -I/opt/local/include -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11\
.0.sdk  -pipe -Os -stdlib=libc++ -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.0.sdk -arch x86_64  -MT src/FbTk/libFbTk_a-Font.o -MD -MP -MF src/FbTk/.deps/libFbTk_a-Font.Tpo -c -o src/FbTk/libFbTk_a-Font.o `test -f 'src/FbTk/Font.cc' || \
echo './'`src/FbTk/Font.cc
src/FbTk/FbTime.cc:64:10: error: redefinition of '_mono'
uint64_t _mono() {
         ^
src/FbTk/FbTime.cc:33:10: note: previous definition is here
uint64_t _mono() {
         ^
1 error generated.
make[2]: *** [src/FbTk/libFbTk_a-FbTime.o] Error 1
make[2]: *** Waiting for unfinished jobs....
mv -f src/FbTk/.deps/libFbTk_a-Color.Tpo src/FbTk/.deps/libFbTk_a-Color.Po
mv -f src/FbTk/.deps/libFbTk_a-BorderTheme.Tpo src/FbTk/.deps/libFbTk_a-BorderTheme.Po
mv -f src/FbTk/.deps/libFbTk_a-EventManager.Tpo src/FbTk/.deps/libFbTk_a-EventManager.Po
mv -f src/FbTk/.deps/libFbTk_a-Container.Tpo src/FbTk/.deps/libFbTk_a-Container.Po
mv -f src/FbTk/.deps/libFbTk_a-ImageImlib2.Tpo src/FbTk/.deps/libFbTk_a-ImageImlib2.Po
mv -f src/FbTk/.deps/libFbTk_a-App.Tpo src/FbTk/.deps/libFbTk_a-App.Po
mv -f src/FbTk/.deps/libFbTk_a-FbString.Tpo src/FbTk/.deps/libFbTk_a-FbString.Po
mv -f src/FbTk/.deps/libFbTk_a-FbPixmap.Tpo src/FbTk/.deps/libFbTk_a-FbPixmap.Po
mv -f src/FbTk/.deps/libFbTk_a-FbWindow.Tpo src/FbTk/.deps/libFbTk_a-FbWindow.Po
mv -f src/FbTk/.deps/libFbTk_a-FileUtil.Tpo src/FbTk/.deps/libFbTk_a-FileUtil.Po
mv -f src/FbTk/.deps/libFbTk_a-Font.Tpo src/FbTk/.deps/libFbTk_a-Font.Po
make[2]: Leaving directory `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_x11_fluxbox/fluxbox/work/fluxbox-1.3.7'

[ballapete (Peter "Pete" Dyballa)]

Main.log from build on Big Sur

[ballapete (Peter "Pete" Dyballa)]

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.

[ballapete (Peter "Pete" Dyballa)]

​http://stackoverflow.com/questions/5167269/clock-gettime-alternative-in-mac-os-x explains a lot.