Re: strtod bugs

[Bruno Haible]

Eric Blake wrote:
> * tests/test-math.c (main): Test it.

This test fails on IRIX 6.5 with CC="cc -O". The reason is that it inlines
the 'd == d' test. Here is the machine code that the compiler generates:

        .ent    main
        .globl  main
main:    # 0x0
        .frame  $sp, 0, $31
.BB1.main:       # 0x0
        jr $31                          # [0]
        addiu $2,$0,1                   # [1]
        .end    main

I'm committing this fix:


2008-04-01  Bruno Haible  <address@hidden>

        Fix test to work on IRIX 6.5 with cc.
        * tests/test-math.c (numeric_equal): New function.
        (main): Use it.

*** tests/test-math.c.orig      2008-04-02 03:29:08.000000000 +0200
--- tests/test-math.c   2008-04-02 03:27:36.000000000 +0200
***************
*** 30,38 ****
  static float n = NAN;
  #endif
  
  int
  main ()
  {
    double d = NAN;
!   return d == d;
  }
--- 30,49 ----
  static float n = NAN;
  #endif
  
+ /* Compare two numbers with ==.
+    This is a separate function because IRIX 6.5 "cc -O" miscompiles an
+    'x == x' test.  */
+ static int
+ numeric_equal (double x, double y)
+ {
+   return x == y;
+ }
+ 
  int
  main ()
  {
    double d = NAN;
!   if (numeric_equal (d, d))
!     return 1;
!   return 0;
  }