Fix MODE=optlinux and MODE=tiny builds

third_party/libcxx/ryu/d2s.cpp

@@ -477,7 +477,7 @@ struct __floating_decimal_64 {
           2882303761517u, 576460752303u, 115292150460u, 23058430092u, 4611686018u, 922337203u, 184467440u,
           36893488u, 7378697u, 1475739u, 295147u, 59029u, 11805u, 2361u, 472u, 94u, 18u, 3u };
 
-        unsigned long _Trailing_zero_bits;
+        unsigned long _Trailing_zero_bits = 0;
 #ifdef _LIBCPP_HAS_BITSCAN64
         (void) _BitScanForward64(&_Trailing_zero_bits, __v.__mantissa); // __v.__mantissa is guaranteed nonzero
 #else // ^^^ 64-bit ^^^ / vvv 32-bit vvv

third_party/libcxx/string

@@ -1883,7 +1883,10 @@ private:
 #endif
 
     for (; __first != __last; ++__first)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
       traits_type::assign(*__dest++, *__first);
+#pragma GCC diagnostic pop
     return __dest;
   }
 

third_party/pcre/pcre2_compile.c

@@ -8169,7 +8169,10 @@ if (*code == OP_CBRA)
   capitem.number = capnumber;
   capitem.next = cb->open_caps;
   capitem.assert_depth = cb->assert_depth;
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wdangling-pointer"
   cb->open_caps = &capitem;
+#pragma GCC diagnostic pop
   }
 
 /* Offset is set zero to mark that this bracket is still open */

third_party/stb/stb_image.c

@@ -4211,9 +4211,12 @@ static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp) {
               tc16[k] = (uint16_t)stbi__get16be(s);  // copy the values as-is
           } else {
             for (k = 0; k < s->img_n; ++k)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-overflow"
               tc[k] = (unsigned char)(stbi__get16be(s) & 255) *
                       stbi__depth_scale_table[z->depth];  // non 8-bit images
                                                           // will be larger
+#pragma GCC diagnostic pop
           }
         }
         break;

third_party/tidy/tidy.c

@@ -1202,7 +1202,10 @@ static tmbstr cleanup_description( ctmbstr description )
                             name = realloc(name, l_name);
                         }
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-truncation"
                         strncpy(name + i_name, &c, 1);
+#pragma GCC diagnostic pop
                         i_name++;
                         i++;
                         break;