PgSQL 7.4.2 - NaN on Tru64 UNIX

Hi guys.

I have just had some problems resolved while building PostgreSQL 7.4.2
on Tru64 UNIX 5.1B.

File "./src/backend/utils/adt/float.c" uses "NAN" on two spots. It ahs a
fall-back definition of NAN as:

#define NAN 0.0/0.0

This compiles on Tru64 4.0D (the compiler swallows it), but fails on
Tru64 UNIX 5.1B. Both basic CC and DTK Compaq CC break on that file
complaining on that constant evaluation. The best way to solve it is to
use system definition of "Infinity Constants". This definition is best
placed in src/include/port/osf1.h This will work on both 5.1B and 4.0D.

This is the patch:

Papa-Legba:/home/r/root/5.1/postgresql-7.4.2# diff -c
src/include/port/osf.h_ORIG src/include/port/osf.h
*** src/include/port/osf.h_ORIG Sun May 16 14:14:22 2004
--- src/include/port/osf.h Sun May 16 14:17:57 2004
***************
*** 5,7 ****
--- 5,17 ----
/*typedef msemaphore slock_t;*/
#include <alpha/builtins.h>
typedef volatile long slock_t;
+
+ /*
+ * This is for NaN (Not a Number) definition.
+ * Note that general definition in PostgreSQL is not type specific, IOW,
+ * PgSQL's definition can be used in all floating point contexts. The
+ * definition given here is for "double NaN", since all sources using it
+ * are using it in "double float" context.
+ */
+ #include <nan.h>
+ #define NAN DBL_INFINITY

The compilation has went smoothly, I'll try to run regression tests.
Will let you know if something fails.

Nix.