Erase \r in the string, read from the file and Fix Windows issues

Author: Thirumalai-Shaktivel

.gitignore

@@ -72,6 +72,7 @@ integration_tests/b5/*
 integration_tests/b6/*
 integration_tests/_lpython-tmp-test-*
 inst/bin/*
+*.tmp
 *.tlog
 *.filters
 *.obj

examples/expr2.py

@@ -1,7 +1,7 @@
 def main0():
     x: i32
-    x = 1
-
+    x = (2+3)*5
+    print(x)
 main0()
 
 # Not implemented yet in LPython:

src/bin/lpython.cpp

@@ -1008,9 +1008,11 @@ int link_executable(const std::vector<std::string> &infiles,
                 cmd += s + " ";
             }
             cmd += runtime_library_dir + "\\lpython_runtime_static.lib";
+            cmd += " > " + outfile + ".tmp";
             int err = system(cmd.c_str());
             if (err) {
-                std::cout << "The command '" + cmd + "' failed." << std::endl;
+                std::cout << "The command '" + cmd + "' failed."
+                    " Error written in `" + outfile + ".tmp`" << std::endl;
                 return 10;
             }
             if (compiler_options.arg_o == "") {

src/libasr/string_utils.cpp

@@ -99,7 +99,9 @@ std::string read_file(const std::string &filename)
     std::vector<char> bytes(filesize);
     ifs.read(&bytes[0], filesize);
 
-    return std::string(&bytes[0], filesize);
+    std::string s(&bytes[0], filesize);
+    s.erase( std::remove(s.begin(), s.end(), '\r'), s.end() );
+    return s;
 }
 
 std::string parent_path(const std::string &path) {

src/libasr/utils2.cpp

@@ -25,6 +25,7 @@ bool read_file(const std::string &filename, std::string &text)
     ifs.read(&bytes[0], filesize);
 
     text = std::string(&bytes[0], filesize);
+    text.erase( std::remove(text.begin(), text.end(), '\r'), text.end() );
     return true;
 }