Formatting and makefile step for clang++ -Weverything with necessary fixes.

.clang-format

@@ -0,0 +1,40 @@
+# C and C++
+---
+AlignEscapedNewlines: Left
+AlignTrailingComments: true
+BasedOnStyle: LLVM
+BraceWrapping:
+  AfterCaseLabel: false
+  AfterClass: false
+  AfterControlStatement: Never
+  AfterFunction: false
+  AfterEnum: false
+  AfterNamespace: false
+  AfterStruct: false
+  AfterUnion: false
+  AfterExternBlock: false
+  BeforeCatch: false
+  BeforeElse: false
+  BeforeLambdaBody: false
+BreakBeforeBraces: Custom
+BreakBeforeInheritanceComma: true
+BreakConstructorInitializers: BeforeComma
+ColumnLimit: 120
+IndentAccessModifiers: false
+IndentCaseLabels: true
+IndentPPDirectives: None
+IndentRequiresClause: false
+IndentWidth: 2
+InsertNewlineAtEOF: true
+# clang clang-format 19
+# KeepEmptyLines:
+#   AtEndOfFile: true
+LineEnding: LF
+NamespaceIndentation: None
+QualifierAlignment: Right
+ReflowComments: false
+RemoveSemicolon: true
+RequiresClausePosition: WithFollowing
+RequiresExpressionIndentation: OuterScope
+SpaceAfterTemplateKeyword: false
+TabWidth: 2

.gitignore

@@ -1,3 +1,4 @@
 /.vscode/
 /demo_sha1
+/test_clang1
 /test_sha1

Makefile

@@ -1,17 +1,23 @@
-CROSS =
-CXX   = $(CROSS)g++
-RM    = rm -f
+CROSS     =
+CXX       = $(CROSS)g++
+RM        = rm -f
+CXX_CLANG = clang++
+CXX_EXTRA_FLAGS = -Werror -Weverything -Wno-c++98-compat-pedantic -Wno-unsafe-buffer-usage -Wno-switch-default
 
 all: demo_sha1 test_sha1
 
 demo_sha1: demo_sha1.cpp sha1.cpp sha1.hpp
-	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -Wall -Wextra -std=c++11 -o $@ demo_sha1.cpp sha1.cpp
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -Wall -Wextra -std=c++11 -Wconversion -o $@ demo_sha1.cpp sha1.cpp
 
 test_sha1: test_sha1.cpp test_sha1_file.cpp sha1.hpp
-	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -Wall -Wextra -std=c++11 -o $@ test_sha1.cpp test_sha1_file.cpp sha1.cpp
+	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -Wall -Wextra -std=c++11 -Wconversion -o $@ test_sha1.cpp test_sha1_file.cpp sha1.cpp
+
+test_clang1: test_sha1.cpp test_sha1_file.cpp sha1.hpp
+	$(CXX_CLANG) $(CXX_EXTRA_FLAGS) -o $@  test_sha1.cpp test_sha1_file.cpp sha1.cpp
+
 
 check: test_sha1
 	./test_sha1
 
 clean:
-	$(RM) demo_sha1 test_sha1
+	$(RM) demo_sha1 test_sha1 test_clang

demo_sha1.cpp

@@ -1,12 +1,12 @@
 /*
     demo_sha1.cpp - demo program of
- 
+
     ============
     SHA-1 in C++
     ============
- 
+
     100% Public Domain.
- 
+
     Original C Code
         -- Steve Reid <steve@edmweb.com>
     Small changes to fit into bglibs
@@ -16,21 +16,20 @@
 */
 
 #include "sha1.hpp"
-#include <string>
 #include <iostream>
-using std::string;
+#include <string>
 using std::cout;
 using std::endl;
+using std::string;
 
-int main(int /* argc */, const char ** /* argv */)
-{
-    const string input = "abc";
+int main(int /* argc */, char const ** /* argv */) {
+  string const input = "abc";
 
-    SHA1 checksum;
-    checksum.update(input);
-    const string hash = checksum.final();
+  SHA1 checksum;
+  checksum.update(input);
+  string const hash = checksum.final();
 
-    cout << "The SHA-1 of \"" << input << "\" is: " << hash << endl;
+  cout << "The SHA-1 of \"" << input << "\" is: " << hash << endl;
 
-    return 0;
+  return 0;
 }

sha1.cpp

@@ -1,5 +1,5 @@
 /*
-    sha1.cpp - This file is intenionally left blank.
+    sha1.cpp - This file is intentionally left blank.
     This file is no longer needed. It is only kept for backard compatibility.
     Simply: #include "sha1.hpp"
 */