toolchain/ghs: Fix green hills toolchain build Vela MIN_MANT error

"stdio/lib_dtoa_engine.c", line 102: error #166: invalid floating constant
        if (x < MIN_MANT)
                ^

"stdio/lib_dtoa_engine.c", line 102: warning apache#1626-D: concatenation with "("
          in macro "PASTE" does not create a valid token
        if (x < MIN_MANT)
                ^

"stdio/lib_dtoa_engine.c", line 102: error #109: expression preceding
          parentheses of apparent call must have (pointer-to-) function type
        if (x < MIN_MANT)
                ^

"stdio/lib_dtoa_engine.c", line 107: error #166: invalid floating constant
                if (y < MAX_MANT)
                        ^

"stdio/lib_dtoa_engine.c", line 107: warning apache#1626-D: concatenation with "("
          in macro "PASTE" does not create a valid token
                if (y < MAX_MANT)
                        ^

"stdio/lib_dtoa_engine.c", line 107: error #109: expression preceding
          parentheses of apparent call must have (pointer-to-) function type
                if (y < MAX_MANT)
                        ^

"stdio/lib_dtoa_engine.c", line 119: error #166: invalid floating constant
                if (y >= MIN_MANT)
                         ^

"stdio/lib_dtoa_engine.c", line 119: warning apache#1626-D: concatenation with "("
          in macro "PASTE" does not create a valid token
                if (y >= MIN_MANT)
                         ^

"stdio/lib_dtoa_engine.c", line 119: error #109: expression preceding
          parentheses of apparent call must have (pointer-to-) function type
                if (y >= MIN_MANT)
                         ^

"stdio/lib_dtoa_engine.c", line 144: error #166: invalid floating constant
        if (x >= MAX_MANT)
                 ^

"stdio/lib_dtoa_engine.c", line 144: warning apache#1626-D: concatenation with "("
          in macro "PASTE" does not create a valid token
        if (x >= MAX_MANT)
                 ^

"stdio/lib_dtoa_engine.c", line 144: error #109: expression preceding
          parentheses of apparent call must have (pointer-to-) function type
        if (x >= MAX_MANT)
                 ^

"stdio/lib_dtoa_engine.c", line 153: error #166: invalid floating constant
        uint64_t decimal = MIN_MANT_INT;
                           ^

"stdio/lib_dtoa_engine.c", line 153: warning apache#1626-D: concatenation with "("
          in macro "PASTE" does not create a valid token
        uint64_t decimal = MIN_MANT_INT;
                           ^

"stdio/lib_dtoa_engine.c", line 153: error #109: expression preceding
          parentheses of apparent call must have (pointer-to-) function type
        uint64_t decimal = MIN_MANT_INT;

Signed-off-by: yanghuatao <[email protected]>

libs/libc/stdio/lib_dtoa_engine.c

@@ -51,6 +51,20 @@
  * by pasting the value of DBL_DIG onto '1e' to
  */
 
+/* Green hills #define DBL_DIG (6) or #define DBL_DIG (15)
+ * we need remove "()" here
+ */
+
+#if DBL_DIG == 6
+#  undef DBL_DIG
+#  define DBL_DIG 6
+#endif
+
+#if DBL_DIG == 15
+#  undef DBL_DIG
+#  define DBL_DIG 15
+#endif
+
 #define PASTE(a)      1e##a
 #define SUBSTITUTE(a) PASTE(a)
 #define MIN_MANT      (SUBSTITUTE(DBL_DIG))