Allow clean compilation of dmg_fp under g++ -Wall -Werror

base/third_party/dmg_fp/gcc_warnings.patch

+Index: dtoa.cc
+===================================================================
+--- dtoa.cc     (revision 9233)
++++ dtoa.cc     (working copy)
+@@ -515,7 +515,7 @@
+ #endif
+ 
+        ACQUIRE_DTOA_LOCK(0);
+-       if (rv = freelist[k]) {
++       if ((rv = freelist[k])) {
+                freelist[k] = rv->next;
+                }
+        else {
+@@ -794,7 +794,7 @@
+        xc0 = c->x;
+ #ifdef ULLong
+        for(; xb < xbe; xc0++) {
+-               if (y = *xb++) {
++               if ((y = *xb++)) {
+                        x = xa;
+                        xc = xc0;
+                        carry = 0;
+@@ -876,7 +876,7 @@
+        int i;
+        static int p05[3] = { 5, 25, 125 };
+ 
+-       if (i = k & 3)
++       if ((i = k & 3))
+                b = multadd(b, p05[i-1], 0);
+ 
+        if (!(k >>= 2))
+@@ -957,7 +957,7 @@
+                        z = *x++ >> k1;
+                        }
+                        while(x < xe);
+-               if (*x1 = z)
++               if ((*x1 = z))
+                        ++n1;
+                }
+ #else
+@@ -1259,12 +1259,12 @@
+        z |= Exp_msk11;
+ #endif
+ #else
+-       if (de = (int)(d0 >> Exp_shift))
++       if ((de = (int)(d0 >> Exp_shift)))
+                z |= Exp_msk1;
+ #endif
+ #ifdef Pack_32
+-       if (y = d1) {
+-               if (k = lo0bits(&y)) {
++       if ((y = d1)) {
++               if ((k = lo0bits(&y))) {
+                        x[0] = y | z << 32 - k;
+                        z >>= k;
+                        }
+@@ -1452,13 +1452,13 @@
+ #ifdef KR_headers
+        (sp, t) char **sp, *t;
+ #else
+-       (CONST char **sp, char *t)
++       (CONST char **sp, CONST char *t)
+ #endif
+ {
+        int c, d;
+        CONST char *s = *sp;
+ 
+-       while(d = *t++) {
++       while((d = *t++)) {
+                if ((c = *++s) >= 'A' && c <= 'Z')
+                        c += 'a' - 'A';
+                if (c != d)
+@@ -1490,7 +1490,7 @@
+                ++s;
+        if (s[1] == '0' && (s[2] == 'x' || s[2] == 'X'))
+                s += 2;
+-       while(c = *(CONST unsigned char*)++s) {
++       while((c = *(CONST unsigned char*)++s)) {
+                if (c >= '0' && c <= '9')
+                        c -= '0';
+                else if (c >= 'a' && c <= 'f')
+@@ -1518,7 +1518,7 @@
+                                        *sp = s + 1;
+                                        break;
+                                        }
+-                               } while(c = *++s);
++                               } while((c = *++s));
+                        break;
+                        }
+ #endif
+@@ -1852,7 +1852,7 @@
+        /* Get starting approximation = rv * 10**e1 */
+ 
+        if (e1 > 0) {
+-               if (i = e1 & 15)
++               if ((i = e1 & 15))
+                        dval(rv) *= tens[i];
+                if (e1 &= ~15) {
+                        if (e1 > DBL_MAX_10_EXP) {
+@@ -1912,7 +1912,7 @@
+                }
+        else if (e1 < 0) {
+                e1 = -e1;
+-               if (i = e1 & 15)
++               if ((i = e1 & 15))
+                        dval(rv) /= tens[i];
+                if (e1 >>= 4) {
+                        if (e1 >= 1 << n_bigtens)
+@@ -2580,7 +2580,7 @@
+ 
+        j = sizeof(ULong);
+        for(k = 0;
+-               sizeof(Bigint) - sizeof(ULong) - sizeof(int) + j <= i;
++               sizeof(Bigint) - sizeof(ULong) - sizeof(int) + j <= (size_t)i;
+                j <<= 1)
+                        k++;
+        r = (int*)Balloc(k);
+@@ -2596,13 +2596,13 @@
+ #ifdef KR_headers
+ nrv_alloc(s, rve, n) char *s, **rve; int n;
+ #else
+-nrv_alloc(char *s, char **rve, int n)
++nrv_alloc(CONST char *s, char **rve, int n)
+ #endif
+ {
+        char *rv, *t;
+ 
+        t = rv = rv_alloc(n);
+-       while(*t = *s++) t++;
++       while((*t = *s++)) t++;
+        if (rve)
+                *rve = t;
+        return rv;
+@@ -2707,7 +2707,7 @@
+                to hold the suppressed trailing zeros.
+        */
+ 
+-       int bbits, b2, b5, be, dig, i, ieps, ilim, ilim0, ilim1,
++       int bbits, b2, b5, be, dig, i, ieps, ilim = 0, ilim0, ilim1 = 0,
+                j, j1, k, k0, k_check, leftright, m2, m5, s2, s5,
+                spec_case, try_quick;
+        Long L;
+@@ -2792,7 +2792,7 @@
+ #ifdef Sudden_Underflow
+        i = (int)(word0(d) >> Exp_shift1 & (Exp_mask>>Exp_shift1));
+ #else
+-       if (i = (int)(word0(d) >> Exp_shift1 & (Exp_mask>>Exp_shift1))) {
++       if ((i = (int)(word0(d) >> Exp_shift1 & (Exp_mask>>Exp_shift1)))) {
+ #endif
+                dval(d2) = dval(d);
+                word0(d2) &= Frac_mask1;
+@@ -2946,7 +2946,7 @@
+                                        }
+                        dval(d) /= ds;
+                        }
+-               else if (j1 = -k) {
++               else if ((j1 = -k)) {
+                        dval(d) *= tens[j1 & 0xf];
+                        for(j = j1 >> 4; j; j >>= 1, i++)
+                                if (j & 1) {
+@@ -3107,7 +3107,7 @@
+                                Bfree(b);
+                                b = b1;
+                                }
+-                       if (j = b5 - m5)
++                       if ((j = b5 - m5))
+                                b = pow5mult(b, j);
+                        }
+                else
+@@ -3145,7 +3145,7 @@
+         * can do shifts and ors to compute the numerator for q.
+         */
+ #ifdef Pack_32
+-       if (i = ((s5 ? 32 - hi0bits(S->x[S->wds-1]) : 1) + s2) & 0x1f)
++       if ((i = ((s5 ? 32 - hi0bits(S->x[S->wds-1]) : 1) + s2) & 0x1f))
+                i = 32 - i;
+ #else
+        if (i = ((s5 ? 32 - hi0bits(S->x[S->wds-1]) : 1) + s2) & 0xf)
+@@ -3322,7 +3322,9 @@
+                ++*s++;
+                }
+        else {
++#ifdef Honor_FLT_ROUNDS
+  trimzeros:
++#endif
+                while(*--s == '0');
+                s++;
+                }
+Index: g_fmt.cc
+===================================================================
+--- g_fmt.cc    (revision 9233)
++++ g_fmt.cc    (working copy)
+@@ -46,14 +46,14 @@
+        if (sign)
+                *b++ = '-';
+        if (decpt == 9999) /* Infinity or Nan */ {
+-               while(*b++ = *s++);
++               while((*b++ = *s++));
+                goto done0;
+                }
+        if (decpt <= -4 || decpt > se - s + 5) {
+                *b++ = *s++;
+                if (*s) {
+                        *b++ = '.';
+-                       while(*b = *s++)
++                       while((*b = *s++))
+                                b++;
+                        }
+                *b++ = 'e';
+@@ -79,10 +79,10 @@
+                *b++ = '.';
+                for(; decpt < 0; decpt++)
+                        *b++ = '0';
+-               while(*b++ = *s++);
++               while((*b++ = *s++));
+                }
+        else {
+-               while(*b = *s++) {
++               while((*b = *s++)) {
+                        b++;
+                        if (--decpt == 0 && *s)
+                                *b++ = '.';
+@@ -93,7 +93,9 @@
+                }
+  done0:
+        freedtoa(s0);
++#ifdef IGNORE_ZERO_SIGN
+  done:
++#endif
+        return b0;
+        }
+