Fixes to build

I just cloned this project (actually https://github.com/stevenknown/xoc but it has not enabled issues there) and tried to build but got some warnings and an error related to try use of HeapSort::HeapValVector<T> hdata(data); with clang++ (6 and 11) and g++9.

Here is the output of git diff -u of my changes to be able to build it:

diff --git a/com/flty.cpp b/com/flty.cpp
index 0a44cbf..5f02c1b 100644
--- a/com/flty.cpp
+++ b/com/flty.cpp
@@ -129,7 +129,7 @@ void Float::dump() const
 {
     StrBuf buf(16);
     format(buf);
-    fprintf(stdout, buf.buf);
+    fprintf(stdout, "%s", buf.buf);
 }
 
 } //namespace xcom
diff --git a/com/rational.cpp b/com/rational.cpp
index 4464267..8b8911f 100644
--- a/com/rational.cpp
+++ b/com/rational.cpp
@@ -139,7 +139,7 @@ void Rational::dump() const
 {
     StrBuf buf(16);
     format(buf);
-    fprintf(stdout, buf.buf);
+    fprintf(stdout, "%s", buf.buf);
 }
 
 
diff --git a/com/sort.cpp b/com/sort.cpp
index 8c2acc7..b37a75c 100644
--- a/com/sort.cpp
+++ b/com/sort.cpp
@@ -54,7 +54,7 @@ public:
     DumpHeap(Vector<T> & data)
     {
         if (data.get_last_idx() < 0) { return; }
-        HeapSort::HeapValVector<T> hdata(data);
+        HeapSort<int>::HeapValVector<T> hdata(data);
         m_pool = smpoolCreate(64, MEM_COMM);
         UINT node_count = 1;
         for (UINT i = hdata.get_begin_idx(); i <= hdata.get_end_idx(); i++) {
diff --git a/com/sort.h b/com/sort.h
index a2ea8cd..3659dda 100644
--- a/com/sort.h
+++ b/com/sort.h
@@ -120,7 +120,7 @@ void Bucket<T>::dump()
     INT j = 0;
     printf("\nBUCKET");
     for (UINT i = 0; i < Hash<T>::m_bucket_size; i++) {
-        printf("\n\tB%d:", i);
+        printf("\n\tB%ud:", i);
         HC<T> * elemhc = (HC<T>*)HB_member(Hash<T>::m_bucket[i]);
         while (elemhc != nullptr) {
             printf("%f,", HC_val(elemhc));
diff --git a/dex/dex_const_info.h b/dex/dex_const_info.h
index d006707..91351f1 100644
--- a/dex/dex_const_info.h
+++ b/dex/dex_const_info.h
@@ -110,7 +110,13 @@ author: Su Zhenyu
 #define HAS_PREDICATE_REGISTER false
 
 //Define the max/min integer value range of target machine.
+#ifdef MIN_HOST_INT_VALUE
+#undef MIN_HOST_INT_VALUE
+#endif
 #define MIN_HOST_INT_VALUE 0x80000000
+#ifdef MAX_HOST_INT_VALUE
+#undef MAX_HOST_INT_VALUE
+#endif
 #define MAX_HOST_INT_VALUE 0x7fffFFFF
 #define EPSILON 0.000001

Review the reported changes in com/flty.cpp, com/rational.cpp, com/sort.cpp, com/sort.h, and dex/dex_const_info.h. Start by reproducing the build with clang++ or g++9 and compare the compiler diagnostics with the supplied diff. Done means the project builds successfully with the affected compilers and the reported error is resolved.