Include Catch2 header directly in repository

Bundle catch.hpp (v2.13.10) to avoid having to install an old release.
Update all test files to use the local header.

Author: renatoGarcia

.github/workflows/ci.yaml

@@ -139,17 +139,6 @@ jobs:
             boost:p
             fmt:p
             ${{ matrix.sys != 'mingw32' && 'range-v3:p' || '' }}
-      - name: setup catch2
-        run: |
-          mkdir -p cmake/catch2
-          curl -L -o cmake/catch2/catch.hpp https://github.com/catchorg/Catch2/releases/download/v2.13.10/catch.hpp
-          cat > cmake/FindCatch2.cmake << 'EOF'
-          add_library(Catch2::Catch2 INTERFACE IMPORTED)
-          set_target_properties(Catch2::Catch2 PROPERTIES
-            INTERFACE_INCLUDE_DIRECTORIES "${CMAKE_CURRENT_LIST_DIR}"
-          )
-          set(Catch2_FOUND TRUE)
-          EOF
       - name: build
         run: |
           cmake . -G Ninja -DCMAKE_MODULE_PATH=$(pwd)/cmake -DENABLE_RANGE_V3=${{ matrix.range_v3 }} -DENABLE_FMT=ON -DBUILD_TESTING=ON -DCMAKE_CXX_STANDARD=${{ matrix.cpp }} -DCMAKE_CXX_FLAGS='-Wall -Wextra -Wconversion -Wshadow -pedantic -Werror -Wno-c2y-extensions' -DCMAKE_BUILD_TYPE=Release

flake.nix

@@ -51,12 +51,12 @@
             nativeBuildInputs = with pkgs.buildPackages; [
               (fmt.override { inherit stdenv; })
               boost
-              catch2
               clang-tools
               cmakeCurses
               conan
               range-v3
             ] ++ app.nativeBuildInputs;
+            hardeningDisable = [ "fortify" ];
        };
 
     in {

tests/CMakeLists.txt

@@ -5,7 +5,6 @@ endif()
 option(ENABLE_RANGE_V3 "If ON the tests to Range-v3 library will be enabled" OFF)
 option(ENABLE_FMT "If ON the tests to {fmt} library will be enabled" OFF)
 
-find_package(Catch2 REQUIRED)
 find_package(Boost REQUIRED)
 
 if (ENABLE_RANGE_V3)
@@ -26,7 +25,7 @@ include_directories(${PROJECT_SOURCE_DIR})
 function(declare_test name)
   add_executable(test_${name} test_${name}.cpp)
   add_test(NAME test_${name} COMMAND test_${name})
-  target_link_libraries(test_${name} PRIVATE Catch2::Catch2 Boost::headers)
+  target_link_libraries(test_${name} PRIVATE Boost::headers)
 
   if (ENABLE_RANGE_V3)
     target_link_libraries(test_${name} PRIVATE range-v3::range-v3)