[MacPorts] #52210: libsdl2 can build on 10.6, but instructions a bit vague

[MacPorts]

#52210: libsdl2 can build on 10.6, but instructions a bit vague
-------------------------------------+--------------------
  Reporter:  kenneth.f.cunningham@…  |      Owner:  jmroot
      Type:  defect                  |     Status:  new
  Priority:  Low                     |  Milestone:
 Component:  ports                   |    Version:
Resolution:                          |   Keywords:
      Port:  libsdl2                 |
-------------------------------------+--------------------
Changes (by mojca):

 * cc: jeremyhu (added)
 * version:  2.3.4 =>


Comment:

 Jeremy asked why the port could not be built without 10.7 SDK. Here's the
 very first problem one hits:
 {{{
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_libsdl2/libsdl2/work/SDL2-2.0.5/src/SDL_error.c:120:
 warning: expected [error|warning|ignored] after '#pragma GCC diagnostic'
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_libsdl2/libsdl2/work/SDL2-2.0.5/src/SDL_error.c:224:
 warning: expected [error|warning|ignored] after '#pragma GCC diagnostic'
   CC     build/SDL_hints.lo
   CC     build/SDL_log.lo
   CC     build/SDL_atomic.lo
   CC     build/SDL_spinlock.lo
   CC     build/SDL_audio.lo
   CC     build/SDL_audiocvt.lo
   CC     build/SDL_audiodev.lo
   CC     build/SDL_audiotypecvt.lo
   CC     build/SDL_mixer.lo
   CC     build/SDL_wave.lo
   CC     build/SDL_cpuinfo.lo
   CC     build/SDL_dynapi.lo
 In file included from
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_libsdl2/libsdl2/work/SDL2-2.0.5/src/dynapi/SDL_dynapi.c:31:
 include/SDL_syswm.h:230:65: error: missing binary operator before token
 "("
 make: *** [build/SDL_dynapi.lo] Error 1
 make: Leaving directory
 `/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_libsdl2/libsdl2/work/SDL2-2.0.5'
 Command failed:  cd
 "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_libsdl2/libsdl2/work/SDL2-2.0.5"
 && /usr/bin/make -w all
 Exit code: 2
 }}}

 After blacklisting the old compiler with
 {{{
 compiler.blacklist *gcc* { clang < 211 }
 }}}
 (I took the list from Ken Cunningham, I don't know whether also the latest
 gcc versions are bad.)

 the following problem pops up:
 {{{
   CC     build/SDL_cocoaevents.lo
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_libsdl2/libsdl2/work/SDL2-2.0.5/src/video/cocoa/SDL_cocoaevents.m:332:40:
 error: use of undeclared identifier 'NSAppKitVersionNumber10_6'; did you
 mean 'NSAppKitVersionNumber'?
     if (floor(NSAppKitVersionNumber) > NSAppKitVersionNumber10_6) {
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~
                                        NSAppKitVersionNumber
 /System/Library/Frameworks/AppKit.framework/Headers/NSApplication.h:21:28:
 note: 'NSAppKitVersionNumber' declared here
 APPKIT_EXTERN const double NSAppKitVersionNumber;
                            ^
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_libsdl2/libsdl2/work/SDL2-2.0.5/src/video/cocoa/SDL_cocoaevents.m:445:9:
 warning: implicit declaration of function
 'IOPMAssertionCreateWithDescription' is invalid in C99 [-Wimplicit-
 function-declaration]
 IOPMAssertionCreateWithDescription(kIOPMAssertPreventUserIdleDisplaySleep,
         ^
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_libsdl2/libsdl2/work/SDL2-2.0.5/src/video/cocoa/SDL_cocoaevents.m:445:44:
 error: use of undeclared identifier
 'kIOPMAssertionTypePreventUserIdleDisplaySleep'
 IOPMAssertionCreateWithDescription(kIOPMAssertPreventUserIdleDisplaySleep,
                                            ^
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_libsdl2/libsdl2/work/SDL2-2.0.5/src/video/cocoa/SDL_cocoaevents.m:33:48:
 note: expanded from macro 'kIOPMAssertPreventUserIdleDisplaySleep'
 #define kIOPMAssertPreventUserIdleDisplaySleep
 kIOPMAssertionTypePreventUserIdleDisplaySleep
                                                ^
 1 warning and 2 errors generated.
 make: *** [build/SDL_cocoaevents.lo] Error 1
 }}}

--
Ticket URL: <https://trac.macports.org/ticket/52210#comment:9>
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