[Bug 1298779] Re: C++11 incompatibility

[Dan Kegel]

ftp://ftp.simplesystems.org/pub/libpng/png/src/libpng12/libpng-1.2.51.tar.xz
appears to lack the problem.

I've attached the minimal diff against Trusty png.h to solve the
problem.

** Patch added: "libpng1.50-cxx11.patch"
   https://bugs.launchpad.net/ubuntu/+source/libpng/+bug/1298779/+attachment/4048623/+files/libpng1.50-cxx11.patch

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Title:
  C++11 incompatibility

Status in “libpng” package in Ubuntu:
  New

Bug description:
  In Trusty beta 1, with libpng12-dev 1.2.50-1ubuntu1 installed,  I can't build an app that uses libpng.
  Symptom here is

  /usr/include/libpng12/png.h:2661:31: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Werror=literal-suffix]
          fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
                                 ^
  /usr/include/libpng12/png.h:2669:31: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Werror=literal-suffix]
          fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
                                 ^
  /usr/include/libpng12/png.h:2677:31: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Werror=literal-suffix]
          fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
                                 ^

  See also https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=676157 for a report
  from a year or so ago about the same problem.  I've also seen reports
  of others hitting this in Trusty, e.g.
  http://farm.openttd.org/browse/OTTD-RLS-LUT32BIT-44;jsessionid=1kl6zmtb50hn3sbdsl3kvbry6

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