Resolve compilation errors if compiled with more stringent semantic checks.

Adding Travis test to build with strict warnings.
Fixing a warning in a test which used signed/unsigned integer comparison.

2 files changed, 5 insertions, 5 deletions

diff --git a/upb/pb/decoder.c b/upb/pb/decoder.c
index 04ca413..522b02e 100644
--- a/upb/pb/decoder.c
+++ b/upb/pb/decoder.c
@@ -124,7 +124,7 @@ static bool in_residual_buf(const upb_pbdecoder *d, const char *p) {
 // and the parsing stack, so must be called whenever either is updated.
 static void set_delim_end(upb_pbdecoder *d) {
   size_t delim_ofs = d->top->end_ofs - d->bufstart_ofs;
-  if (delim_ofs <= (d->end - d->buf)) {
+  if (delim_ofs <= (size_t)(d->end - d->buf)) {
     d->delim_end = d->buf + delim_ofs;
     d->data_end = d->delim_end;
   } else {
@@ -268,7 +268,7 @@ static NOINLINE int32_t getbytes_slow(upb_pbdecoder *d, void *buf,
     advancetobuf(d, d->buf_param, d->size_param);
   }
   if (curbufleft(d) >= bytes) {
-    consumebytes(d, buf + avail, bytes);
+    consumebytes(d, (char *)buf + avail, bytes);
     return DECODE_OK;
   } else if (d->data_end == d->delim_end) {
     seterr(d, "Submessage ended in the middle of a value or group");
@@ -296,7 +296,7 @@ static NOINLINE size_t peekbytes_slow(upb_pbdecoder *d, void *buf,
   memcpy(buf, d->ptr, ret);
   if (in_residual_buf(d, d->ptr)) {
     size_t copy = UPB_MIN(bytes - ret, d->size_param);
-    memcpy(buf + ret, d->buf_param, copy);
+    memcpy((char *)buf + ret, d->buf_param, copy);
     ret += copy;
   }
   return ret;
diff --git a/upb/pb/encoder.c b/upb/pb/encoder.c
index d5685dc..2534a4d 100644
--- a/upb/pb/encoder.c
+++ b/upb/pb/encoder.c
@@ -79,7 +79,7 @@ static upb_pb_encoder_segment *top(upb_pb_encoder *e) {
 // Call to ensure that at least "bytes" bytes are available for writing at
 // e->ptr.  Returns false if the bytes could not be allocated.
 static bool reserve(upb_pb_encoder *e, size_t bytes) {
-  if ((e->limit - e->ptr) < bytes) {
+  if ((size_t)(e->limit - e->ptr) < bytes) {
     size_t needed = bytes + (e->ptr - e->buf);
     size_t old_size = e->limit - e->buf;
     size_t new_size = old_size;
@@ -110,7 +110,7 @@ static bool reserve(upb_pb_encoder *e, size_t bytes) {
 // Call when "bytes" bytes have been writte at e->ptr.  The caller *must* have
 // previously called reserve() with at least this many bytes.
 static void encoder_advance(upb_pb_encoder *e, size_t bytes) {
-  assert((e->limit - e->ptr) >= bytes);
+  assert((size_t)(e->limit - e->ptr) >= bytes);
   e->ptr += bytes;
 }