Testing libexpat, error: 'NAN' was not declared in this scope

[Jeffrey Walton]

Hi Everyone,

I'm trying to compile libexpat 2.4.5 on SOlaris 11.4. It has that
antique GCC 4.8.2. The build is failing:

$ make check -k
...
/bin/g++ -DHAVE_CONFIG_H -I. -I..   -DXML_ENABLE_VISIBILITY=1
-I./../lib -I/opt/ssh/incl
ude -DNDEBUG -Wall   -fexceptions -fno-strict-aliasing -g2 -O2 -m64
-march=native -fPIC
-pthread -MT runtestspp.o -MD -MP -MF .deps/runtestspp.Tpo -c -o
runtestspp.o runtestspp
.cpp
In file included from runtestspp.cpp:36:0:
runtests.c: In function 'void test_billion_laughs_attack_protection_api()':
runtests.c:11712:32: error: 'NAN' was not declared in this scope
          parserWithoutParent, NAN)
                               ^
runtests.c:11734:32: error: 'INFINITY' was not declared in this scope
          parserWithoutParent, INFINITY)
                               ^
*** Error code 1

I've included <sunmath.h> but the defines/symbols are still missing. I
also included headers mentioned at
https://docs.oracle.com/cd/E19957-01/806-3568/ncg_lib.html. I'm out of
ideas.

Does anyone know what to include to get those symbols?

Jeff