Add `--version` to wabt tools (#1175)

Closes: #1106

Ported versioning system from [Binaryen CMakeLists.txt](https://github.com/WebAssembly/binaryen/blob/dc31b460fef47dfb3415b4ae6276fff4919a03e2/CMakeLists.txt#L10-L23)

```
bin/wasm2c --version
1.0.11-44-g71f883ad
```

Applied to (all) tools in `src/tools/`.

15 files changed, 15 insertions, 13 deletions

diff --git a/src/config.h.in b/src/config.h.in
index 136454db..99f1741e 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -20,6 +20,8 @@
 #include <stdint.h>
 #include <stdlib.h>
 
+#cmakedefine WABT_VERSION_INFO "${WABT_VERSION_INFO}"
+
 /* TODO(binji): nice way to define these with WABT_ prefix? */
 
 /* Whether <alloca.h> is available */
diff --git a/src/option-parser.cc b/src/option-parser.cc
index 71c2e203..263ef176 100644
--- a/src/option-parser.cc
+++ b/src/option-parser.cc
@@ -50,6 +50,10 @@ OptionParser::OptionParser(const char* program_name, const char* description)
     : program_name_(program_name),
       description_(description),
       on_error_([this](const std::string& message) { DefaultError(message); }) {
+
+  // Add common options
+  AddHelpOption();
+  AddVersionOption();
 }
 
 void OptionParser::AddOption(const Option& option) {
@@ -96,6 +100,13 @@ void OptionParser::AddHelpOption() {
   });
 }
 
+void OptionParser::AddVersionOption() {
+  AddOption("version", "Print version information", [this]() {
+    printf("%s\n", WABT_VERSION_INFO);
+    exit(0);
+  });
+}
+
 void OptionParser::SetErrorCallback(const Callback& callback) {
   on_error_ = callback;
 }
diff --git a/src/option-parser.h b/src/option-parser.h
index 945434a9..98b82727 100644
--- a/src/option-parser.h
+++ b/src/option-parser.h
@@ -78,9 +78,10 @@ class OptionParser {
                  const char* metavar,
                  const char* help,
                  const Callback&);
-  void AddHelpOption();
 
  private:
+  void AddHelpOption();
+  void AddVersionOption();
   static int Match(const char* s, const std::string& full, bool has_argument);
   void WABT_PRINTF_FORMAT(2, 3) Errorf(const char* format, ...);
   void HandleArgument(size_t* arg_index, const char* arg_value);
diff --git a/src/tools/spectest-interp.cc b/src/tools/spectest-interp.cc
index de770d24..e59895d7 100644
--- a/src/tools/spectest-interp.cc
+++ b/src/tools/spectest-interp.cc
@@ -70,7 +70,6 @@ static void ParseOptions(int argc, char** argv) {
     s_verbose++;
     s_log_stream = FileStream::CreateStdout();
   });
-  parser.AddHelpOption();
   s_features.AddOptions(&parser);
   parser.AddOption('V', "value-stack-size", "SIZE",
                    "Size in elements of the value stack",
diff --git a/src/tools/wasm-decompile.cc b/src/tools/wasm-decompile.cc
index a50d8801..d351b7bf 100644
--- a/src/tools/wasm-decompile.cc
+++ b/src/tools/wasm-decompile.cc
@@ -52,7 +52,6 @@ int ProgramMain(int argc, char** argv) {
       "  # parse binary file test.wasm and write text file test.dcmp\n"
       "  $ wasm-decompile test.wasm -o test.dcmp\n";
     OptionParser parser("wasm-decompile", s_description);
-    parser.AddHelpOption();
     parser.AddOption(
         'o', "output", "FILENAME",
         "Output file for the decompiled file, by default use stdout",
diff --git a/src/tools/wasm-interp.cc b/src/tools/wasm-interp.cc
index c08a4382..d9c0aa29 100644
--- a/src/tools/wasm-interp.cc
+++ b/src/tools/wasm-interp.cc
@@ -83,7 +83,6 @@ static void ParseOptions(int argc, char** argv) {
     s_verbose++;
     s_log_stream = FileStream::CreateStdout();
   });
-  parser.AddHelpOption();
   s_features.AddOptions(&parser);
   parser.AddOption('V', "value-stack-size", "SIZE",
                    "Size in elements of the value stack",
diff --git a/src/tools/wasm-objdump.cc b/src/tools/wasm-objdump.cc
index 28a059d7..f7ef1ddd 100644
--- a/src/tools/wasm-objdump.cc
+++ b/src/tools/wasm-objdump.cc
@@ -60,7 +60,6 @@ static void ParseOptions(int argc, char** argv) {
                    []() { s_objdump_options.details = true; });
   parser.AddOption('r', "reloc", "Show relocations inline with disassembly",
                    []() { s_objdump_options.relocs = true; });
-  parser.AddHelpOption();
   parser.AddArgument(
       "filename", OptionParser::ArgumentCount::OneOrMore,
       [](const char* argument) { s_infiles.push_back(argument); });
diff --git a/src/tools/wasm-opcodecnt.cc b/src/tools/wasm-opcodecnt.cc
index 6915dc82..eb49dce4 100644
--- a/src/tools/wasm-opcodecnt.cc
+++ b/src/tools/wasm-opcodecnt.cc
@@ -60,7 +60,6 @@ static void ParseOptions(int argc, char** argv) {
     s_log_stream = FileStream::CreateStdout();
     s_read_binary_options.log_stream = s_log_stream.get();
   });
-  parser.AddHelpOption();
   s_features.AddOptions(&parser);
   parser.AddOption('o', "output", "FILENAME",
                    "Output file for the opcode counts, by default use stdout",
diff --git a/src/tools/wasm-strip.cc b/src/tools/wasm-strip.cc
index 607ea0da..f8386720 100644
--- a/src/tools/wasm-strip.cc
+++ b/src/tools/wasm-strip.cc
@@ -37,7 +37,6 @@ examples:
 static void ParseOptions(int argc, char** argv) {
   OptionParser parser("wasm-strip", s_description);
 
-  parser.AddHelpOption();
   parser.AddArgument("filename", OptionParser::ArgumentCount::One,
                      [](const char* argument) {
                        s_filename = argument;
diff --git a/src/tools/wasm-validate.cc b/src/tools/wasm-validate.cc
index 5ec6be1d..3d671b2f 100644
--- a/src/tools/wasm-validate.cc
+++ b/src/tools/wasm-validate.cc
@@ -52,7 +52,6 @@ static void ParseOptions(int argc, char** argv) {
     s_verbose++;
     s_log_stream = FileStream::CreateStdout();
   });
-  parser.AddHelpOption();
   s_features.AddOptions(&parser);
   parser.AddOption("no-debug-names", "Ignore debug names in the binary file",
                    []() { s_read_debug_names = false; });
diff --git a/src/tools/wasm2c.cc b/src/tools/wasm2c.cc
index c7ce2113..d35d5789 100644
--- a/src/tools/wasm2c.cc
+++ b/src/tools/wasm2c.cc
@@ -62,7 +62,6 @@ static void ParseOptions(int argc, char** argv) {
     s_verbose++;
     s_log_stream = FileStream::CreateStdout();
   });
-  parser.AddHelpOption();
   parser.AddOption(
       'o', "output", "FILENAME",
       "Output file for the generated C source file, by default use stdout",
diff --git a/src/tools/wasm2wat.cc b/src/tools/wasm2wat.cc
index 53c7001c..8167c168 100644
--- a/src/tools/wasm2wat.cc
+++ b/src/tools/wasm2wat.cc
@@ -64,7 +64,6 @@ static void ParseOptions(int argc, char** argv) {
     s_verbose++;
     s_log_stream = FileStream::CreateStdout();
   });
-  parser.AddHelpOption();
   parser.AddOption(
       'o', "output", "FILENAME",
       "Output file for the generated wast file, by default use stdout",
diff --git a/src/tools/wast2json.cc b/src/tools/wast2json.cc
index 42d8859f..33c4895c 100644
--- a/src/tools/wast2json.cc
+++ b/src/tools/wast2json.cc
@@ -65,7 +65,6 @@ static void ParseOptions(int argc, char* argv[]) {
     s_verbose++;
     s_log_stream = FileStream::CreateStdout();
   });
-  parser.AddHelpOption();
   parser.AddOption("debug-parser", "Turn on debugging the parser of wast files",
                    []() { s_debug_parsing = true; });
   s_features.AddOptions(&parser);
diff --git a/src/tools/wat-desugar.cc b/src/tools/wat-desugar.cc
index 0760100d..cc6a2cba 100644
--- a/src/tools/wat-desugar.cc
+++ b/src/tools/wat-desugar.cc
@@ -59,7 +59,6 @@ examples:
 static void ParseOptions(int argc, char** argv) {
   OptionParser parser("wat-desugar", s_description);
 
-  parser.AddHelpOption();
   parser.AddOption('o', "output", "FILE", "Output file for the formatted file",
                    [](const char* argument) { s_outfile = argument; });
   parser.AddOption("debug-parser", "Turn on debugging the parser of wat files",
diff --git a/src/tools/wat2wasm.cc b/src/tools/wat2wasm.cc
index 04dc155d..e1bb192a 100644
--- a/src/tools/wat2wasm.cc
+++ b/src/tools/wat2wasm.cc
@@ -71,7 +71,6 @@ static void ParseOptions(int argc, char* argv[]) {
     s_verbose++;
     s_log_stream = FileStream::CreateStdout();
   });
-  parser.AddHelpOption();
   parser.AddOption("debug-parser", "Turn on debugging the parser of wat files",
                    []() { s_debug_parsing = true; });
   parser.AddOption('d', "dump-module",