@make.sh New choice ./make.sh --release is fast

```
Welcome to Termux!
~/SubStack $ ./make.sh
\# /* Dual licenses: choose "Creative Commons" or "Apache 2" (allows all uses) */
\# /* `./make.sh` defaults to `./make.sh --debug`. Use `./make.sh --release` if you want fast executables */
+ clang++ -fsanitize=address -fno-sanitize-recover=all -fsanitize=float-divide-by-zero -fsanitize=float-cast-overflow -fno-sanitize=null -fno-sanitize=alignment -fno-omit-frame-pointer -g -x c -c ./cxx//../c/rfc6234/sha1.c
^C
~/SubStack $ ./make.sh --release
\# /* Dual licenses: choose "Creative Commons" or "Apache 2" (allows all uses) */
\# /* `./make.sh --release` does not support profilers/debuggers (use `./make.sh --debug` for this) */
+ clang++ -fomit-frame-pointer -DNDEBUG -O2 -x c -c ./cxx//../c/rfc6234/sha1.c
+ clang++ -fomit-frame-pointer -DNDEBUG -O2 -x c -c ./cxx//../c/rfc6234/sha224-256.c
+ clang++ -fomit-frame-pointer -DNDEBUG -O2 -x c -c ./cxx//../c/rfc6234/sha384-512.c
+ clang++ -fomit-frame-pointer -DNDEBUG -O2 -c ./cxx//ClassSha2.cxx
+ clang++ -fomit-frame-pointer -DNDEBUG -O2 -c ./cxx//ClassResultList.cxx
+ clang++ -fomit-frame-pointer -DNDEBUG -O2 -c ./cxx//ClassCns.cxx
+ clang++ -fomit-frame-pointer -DNDEBUG -O2 -c ./cxx//VirusAnalysis.cxx
+ clang++ -fomit-frame-pointer -DNDEBUG -O2 -c ./cxx//ConversationCns.cxx
./cxx//ConversationCns.cxx:106:74: warning: non-void function does not return a value [-Wreturn-type]
  106 | const FileBytecode conversationParseQuestion(const FilePath &xhtmlFile) {} /* TODO */
      |                                                                          ^
./cxx//ConversationCns.cxx:107:88: warning: non-void function does not return a value [-Wreturn-type]
  107 | const std::vector<FileBytecode> conversationParseResponses(const FilePath &xhtmlFile) {} /* TODO */
      |                                                                                        ^
2 warnings generated.
+ clang++ -fomit-frame-pointer -DNDEBUG -O2 -c ./cxx//main.cxx
./+ clang++ -fomit-frame-pointer -DNDEBUG -O2 sha1.o sha224-256.o sha384-512.o ClassSha2.o ClassResultList.o ClassCns.o VirusAnalysis.o ConversationCns.o main.o
+ set +x
~/SubStack $ ./a.out
cxx/Macros.hxx: pass
virusAnalysisTestsThrows(): pass
conversationCnsTestsThrows(): Segmentation fault
~/SubStack $
```

make.sh

@@ -1,13 +1,13 @@
 #!/bin/sh
-echo '/* Dual licenses: choose "Creative Commons" or "Apache 2" (allows all uses) */'
+echo '# /* Dual licenses: choose "Creative Commons" or "Apache 2" (allows all uses) */'
 #cd build
 sSRC="./cxx/"
 #INCLUDES="${sSRC}"
 #export CXX_FLAGS="-I${INCLUDES}"
+CXX_FLAGS_RELEASE="-fomit-frame-pointer -DNDEBUG -O2"
 CXX_FLAGS_DEBUG="-fsanitize=address -fno-sanitize-recover=all -fsanitize=float-divide-by-zero -fsanitize=float-cast-overflow -fno-sanitize=null -fno-sanitize=alignment" #/* supports `g++`/`clang++`: https://developers.redhat.com/blog/2021/05/05/memory-error-checking-in-c-and-c-comparing-sanitizers-and-valgrind#tldr */
-export ASAN_OPTIONS=abort_on_error=1:fast_unwind_on_malloc=0:detect_leaks=0 UBSAN_OPTIONS=print_stacktrace=1 #/* "For LLDB/GDB and to prevent very short stack traces and usually false leaks detection" */
 CXX_FLAGS_DEBUG="${CXX_FLAGS_DEBUG} -fno-omit-frame-pointer" #/* thus optimization won't remove stacktraces: https://stackoverflow.com/questions/48234575/g-will-fno-omit-frame-pointer-be-effective-if-specified-before-o2-or-o3 https://clang.llvm.org/docs/MemorySanitizer.html */
-CXX_FLAGS_DEBUG="${CXX_FLAGS_DEBUG} -g" #/* gives line numbers, + arguments, to stacktraces */
+CXX_FLAGS_DEBUG="${CXX_FLAGS_DEBUG} -g" #/* extra symbols (line numbers + arguments) to stacktraces */
 #CXX_FLAGS_DEBUG="${CXX_FLAGS_DEBUG} -fno-optimize-sibling-calls" #/* Don't inline functions. Does extra stacktraces. */
 #CXX_FLAGS_DEBUG="${CXX_FLAGS_DEBUG} -fsanitize=undefined" #/* causes 'cannot locate symbol "__ubsan_handle_function_type_mismatch_abort"' */
 if command -v ctags > /dev/null; then
@@ -21,9 +21,16 @@ else
 	echo "Error: no clang++, no g++. `apt install clang` or `apt install gcc`"
 	exit 1
 fi
-rm *.o
-CXX_FLAGS="${CXX_FLAGS} ${CXX_FLAGS_DEBUG}" #/* comment this to disable sanitizers/stacktraces (if you want to run fast) */
+if [ "--release" = "$1" ]; then
+	echo "# /* \`$0 --release\` does not support profilers/debuggers (use \`$0 --debug\` for this) */"
+	CXX_FLAGS="${CXX_FLAGS} ${CXX_FLAGS_RELEASE}"
+else
+	echo "# /* \`$0\` defaults to \`$0 --debug\`. Use \`$0 --release\` if you want fast executables */"
+	CXX_FLAGS="${CXX_FLAGS} ${CXX_FLAGS_DEBUG}"
+	export ASAN_OPTIONS=abort_on_error=1:fast_unwind_on_malloc=0:detect_leaks=0 UBSAN_OPTIONS=print_stacktrace=1 #/* "For LLDB/GDB and to prevent very short stack traces and usually false leaks detection" */
+fi
 CXX="${CXX} ${CXX_FLAGS}"
+rm *.o
 set -x
 $CXX -x c -c ${sSRC}/../c/rfc6234/sha1.c
 $CXX -x c -c ${sSRC}/../c/rfc6234/sha224-256.c