cmake: Roll back cmake version change

flake.nix

@@ -0,0 +1,29 @@
+{
+  description = "A template for Nix based C++ project setup.";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/21.05";
+
+    utils.url = "github:numtide/flake-utils";
+    utils.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = { self, nixpkgs, ... }@inputs: inputs.utils.lib.eachSystem [
+    "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin"
+  ] (system: let pkgs = import nixpkgs {
+                   inherit system;
+                 };
+             in {
+               devShell = pkgs.mkShell rec {
+                 name = "Quantlib";
+
+                 packages = with pkgs; [
+                   # Development Tools
+                   llvmPackages_11.clang
+                   cmake
+                   boost
+                 ];
+                 shellHook = ''export CXX=clang++ && export CC=clang'';
+               };
+             });
+}

fuzz-test-suite/dateparserfuzzer.cpp

@@ -5,18 +5,24 @@
 #include <ql/time/timeunit.hpp>
 #include <ql/utilities/dataparsers.hpp>
 #include <string>
+#include <iostream>
 
 #ifndef __clang__
-#pragma message("Fuzzer headers are available from clang, other compilers have not been tested.")
+#    pragma message( \
+        "Fuzzer headers are available from clang, other compilers have not been tested.")
 #endif
 #include <fuzzer/FuzzedDataProvider.h>
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
     FuzzedDataProvider fdp(data, size);
     constexpr int kMaxString = 100;
+    std::string first = fdp.ConsumeRandomLengthString(kMaxString);
+    std::string second = fdp.ConsumeRandomLengthString(kMaxString);
+    std::cout << first.size() << " " << second.size() << "\n";
+
     try {
-        (void)QuantLib::DateParser::parseFormatted(fdp.ConsumeRandomLengthString(kMaxString), "%Y-%m-%d");
-        (void)QuantLib::DateParser::parseISO(fdp.ConsumeRandomLengthString(kMaxString));
+   //     (void)QuantLib::DateParser::parseFormatted(first, "%Y-%m-%d");
+   //     (void)QuantLib::DateParser::parseISO(second);
     } catch (const std::exception& e) {
         // Handle or ignore exceptions
     }