poppler @0.65.0: error: use of undeclared identifier 'nullptr'

[ryandesign (Ryan Carsten Schmidt)]

​https://build.macports.org/builders/ports-10.8_x86_64_legacy-builder/builds/63031/steps/install-port/logs/stdio

[kencu (Ken)]

Adding this worked for me on 10.6.8, clang-3.9, libc++:

configure.cxxflags-append -std=c++11

Not quite sure why every system doesn't need this added.

[ryandesign (Ryan Carsten Schmidt)]

One reason might be that clang 5 and earlier defaulted to -std=gnu++98 while clang 6 and later default to -std=gnu++14.

[kencu (Ken)]

Interestingly, the build of poppler fails on 10.13 when building with macports-clang-5.0, but succeeds when building with /usr/bin/clang. Also, the build with /usr/bin/clang has this added -std=c++11 to the build line somewhere, somehow.

So clearly we'll just add that -std=c++11 to all builds, and fix this issue.

[Ken <21211439+kencu@…>]

In bf4d73a126ead4f916d0a7c8f6570de5dd511880/macports-ports (master):

poppler: add -std=c++11 to all builds

fixes builds with compilers that don't automatically default to this.
closes: #56679