epics 3.12.4 rebuild

[D Peter Siddons <siddons@bnl.gov>]

I just had a reason to re-compile my EPICS distribution, and it failed. It is 3.14.12.4, and I am running Ubunti 16.04 LTS, using gcc version 5.4.0. Here is the error:

make[3]: Entering directory '/home/peter/epics/base-3.14.12.4/src/libCom/test/O.linux-x86_64'

/usr/bin/g++ -c  -D_POSIX_C_SOURCE=199506L -D_POSIX_THREADS -D_XOPEN_SOURCE=500           -D_X86_64_  -DUNIX  -D_BSD_SOURCE -Dlinux  -D_REENTRANT   -O3 -g   -Wall      -m64      -MMD -I. -I../O.Common -I. -I.. -I../../../../include/os/Linux -I../../../../include        ../epicsCalcTest.cpp
../epicsCalcTest.cpp: In function ‘int main(int, char**)’:
../../../../include/os/Linux/epicsMath.h:22:21: error: non-floating-point argument in call to function ‘__builtin_isfinite’
 #  define finite(x) isfinite(x)
                     ^
../epicsCalcTest.cpp:102:40: note: in definition of macro ‘testExpr’
 #define testExpr(expr) testCalc(#expr, expr);
                                        ^
../epicsCalcTest.cpp:314:14: note: in expansion of macro ‘finite’
     testExpr(finite(0));
              ^
../epicsCalcTest.cpp:328:14: error: non-floating-point argument in call to function ‘__builtin_isinf_sign’
     testExpr(isinf(0));
              ^
../epicsCalcTest.cpp:102:40: note: in definition of macro ‘testExpr’
 #define testExpr(expr) testCalc(#expr, expr);
                                        ^
../epicsCalcTest.cpp:332:14: error: non-floating-point argument in call to function ‘__builtin_isnan’
     testExpr(isnan(0));
              ^
../epicsCalcTest.cpp:102:40: note: in definition of macro ‘testExpr’
 #define testExpr(expr) testCalc(#expr, expr);
                                        ^
../../../../configure/RULES_BUILD:209: recipe for target 'epicsCalcTest.o' failed
make[3]: *** [epicsCalcTest.o] Error 1
make[3]: Leaving directory '/home/peter/epics/base-3.14.12.4/src/libCom/test/O.linux-x86_64'
../../../configure/RULES_ARCHS:63: recipe for target 'install.linux-x86_64' failed
make[2]: *** [install.linux-x86_64] Error 2

Any ideas?