[MacPorts] #60655: flatbuffers: error: use of undeclared identifier 'asprintf_l'

[MacPorts]

#60655: flatbuffers: error: use of undeclared identifier 'asprintf_l'
--------------------------+-------------------------
 Reporter:  ryandesign    |      Owner:  herbygillot
     Type:  defect        |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.6.2
 Keywords:  mountainlion  |       Port:  flatbuffers
--------------------------+-------------------------
 [https://build.macports.org/builders/ports-10.8_x86_64-builder/builds/16191/steps
 /install-port/logs/stdio flatbuffers fails to build on Mountain Lion] with
 this error:

 {{{
 In file included from
 /opt/local/libexec/llvm-9.0/bin/../include/c++/v1/sstream:173:
 In file included from
 /opt/local/libexec/llvm-9.0/bin/../include/c++/v1/ostream:140:
 /opt/local/libexec/llvm-9.0/bin/../include/c++/v1/locale:1571:20: error:
 use of undeclared identifier 'asprintf_l'
             __nc = __libcpp_asprintf_l(&__nb, _LIBCPP_GET_C_LOCALE, __fmt,
 (int)__iob.precision(), __v);
                    ^
 /opt/local/libexec/llvm-9.0/bin/../include/c++/v1/__bsd_locale_defaults.h:33:61:
 note: expanded from macro '__libcpp_asprintf_l'
 #define __libcpp_asprintf_l(...)
 asprintf_l(__VA_ARGS__)
                                                             ^
 }}}

 [https://bugs.llvm.org/show_bug.cgi?id=10478 this llvm bug report]
 suggests defining `_DARWIN_C_SOURCE` is the solution.

-- 
Ticket URL: <https://trac.macports.org/ticket/60655>
MacPorts <https://www.macports.org/>
Ports system for macOS