demonstrative cpp file

.gitea/workflows/ci.yml

@@ -5,5 +5,6 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - name: Printing hello
-      run: echo "Hello, World!"
+      - uses: actions/checkout@v4
+      - name: build using g++
+        run: g++ main.cpp -o main -Werror -Wpedantic -pedantic-errors -Wall -Wextra -Wfatal-errors -Wabi  -Wdouble-promotion -Wnoexcept  -Wdeprecated -Wctor-dtor-privacy -Wredundant-tags -Weffc++ -Wstrict-null-sentinel -Wold-style-cast -Wsign-promo -Wmismatched-tags -Wextra-semi -Wsuggest-final-types -Wsuggest-final-methods -Wsuggest-override -Wnull-dereference -Wnrvo -Wreturn-mismatch -Wuseless-cast -Wuninitialized -Wstrict-overflow=4 -Wsuggest-attribute=pure -Wsuggest-attribute=const -Wsuggest-attribute=noreturn -Wmissing-noreturn -Wsuggest-attribute=malloc -Wsuggest-attribute=returns_nonnull -Wsuggest-attribute=format -Wmissing-format-attribute -Wsuggest-attribute=cold -Walloc-size -Walloc-zero -Warith-conversion -Wduplicated-branches -Wduplicated-cond -Wzero-as-null-pointer-constant -Wtrampolines -Wshadow -Wunsafe-loop-optimizations -Wcast-qual -Wcast-align -Wconversion -Wenum-conversion -Wlogical-op

main.cpp

@@ -0,0 +1,6 @@
+#include <cstdio>
+
+auto main() -> int 
+{
+  std::printf("Hello Welt!");
+}