try to fix invalid argument bug, set errno first before using it

Author: zhaisitong

libs/librrgraph/src/io/gen/rr_graph_uxsdcxx.h

@@ -2072,6 +2072,7 @@ inline enum_loc_side lex_enum_loc_side(const char *in, bool throw_on_invalid, co
 /* Internal loading functions, which validate and load a PugiXML DOM tree into memory. */
 inline int load_int(const char *in, const std::function<void(const char *)> * report_error){
 	int out;
+    errno = 0;
 	out = std::strtol(in, NULL, 10);
 	if(errno != 0)
 		noreturn_report(report_error, ("Invalid value `" + std::string(in) + "` when loading into a int.").c_str());
@@ -2080,6 +2081,7 @@ inline int load_int(const char *in, const std::function<void(const char *)> * re
 
 inline unsigned int load_unsigned_int(const char *in, const std::function<void(const char *)> * report_error){
 	unsigned int out;
+    errno = 0;
 	out = std::strtoul(in, NULL, 10);
 	if(errno != 0)
 		noreturn_report(report_error, ("Invalid value `" + std::string(in) + "` when loading into a unsigned int.").c_str());
@@ -2088,6 +2090,7 @@ inline unsigned int load_unsigned_int(const char *in, const std::function<void(c
 
 inline float load_float(const char *in, const std::function<void(const char *)> * report_error){
 	float out;
+    errno = 0;
 	out = std::strtof(in, NULL);
 	if(errno != 0)
 		noreturn_report(report_error, ("Invalid value `" + std::string(in) + "` when loading into a float.").c_str());

vpr/src/base/gen/vpr_constraints_uxsdcxx.h

@@ -428,6 +428,7 @@ template<std::size_t N>
 inline int load_int(const char* in, const std::function<void(const char*)>* report_error) {
     int out;
     std::printf("before reading int errno:%d\n", errno);
+    errno = 0;
     out = std::strtol(in, NULL, 10);
     if (errno != 0) {
         std::printf("after reading int errno:%d\n", errno);

vpr/src/base/vpr_constraints_serializer.h

@@ -115,7 +115,7 @@ class VprConstraintsSerializer final : public uxsd::VprConstraintsBase<VprConstr
         return temp_atom_string_.c_str();
     }
 
-    virtual inline void set_add_atom_name_pattern(const char* name_pattern, void*& ctx) final {
+    virtual inline void set_add_atom_name_pattern(const char* name_pattern, void*& /*ctx*/) final {
         auto& atom_ctx = g_vpr_ctx.atom();
         std::string atom_name = name_pattern;