Add TORCHCODEC_DISABLE_COMPILE_WARNING_AS_ERROR environment variable to disable -Werror compilation option (#656)

Co-authored-by: Nicolas Hug <contact@nicolas-hug.com>

Author: traversaro

setup.py

@@ -112,6 +112,9 @@ def _build_all_extensions_with_cmake(self):
         torch_dir = Path(torch.utils.cmake_prefix_path) / "Torch"
         cmake_build_type = os.environ.get("CMAKE_BUILD_TYPE", "Release")
         enable_cuda = os.environ.get("ENABLE_CUDA", "")
+        torchcodec_disable_compile_warning_as_error = os.environ.get(
+            "TORCHCODEC_DISABLE_COMPILE_WARNING_AS_ERROR", "OFF"
+        )
         python_version = sys.version_info
         cmake_args = [
             f"-DCMAKE_INSTALL_PREFIX={self._install_prefix}",
@@ -120,6 +123,7 @@ def _build_all_extensions_with_cmake(self):
             f"-DCMAKE_BUILD_TYPE={cmake_build_type}",
             f"-DPYTHON_VERSION={python_version.major}.{python_version.minor}",
             f"-DENABLE_CUDA={enable_cuda}",
+            f"-DTORCHCODEC_DISABLE_COMPILE_WARNING_AS_ERROR={torchcodec_disable_compile_warning_as_error}",
         ]
 
         Path(self.build_temp).mkdir(parents=True, exist_ok=True)

src/torchcodec/_core/CMakeLists.txt

@@ -8,7 +8,13 @@ find_package(pybind11 REQUIRED)
 find_package(Torch REQUIRED)
 find_package(Python3 ${PYTHON_VERSION} EXACT COMPONENTS Development)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic -Werror ${TORCH_CXX_FLAGS}")
+if(DEFINED TORCHCODEC_DISABLE_COMPILE_WARNING_AS_ERROR AND TORCHCODEC_DISABLE_COMPILE_WARNING_AS_ERROR)
+    set(TORCHCODEC_WERROR_OPTION "")
+else()
+    set(TORCHCODEC_WERROR_OPTION "-Werror")
+endif()
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -pedantic ${TORCHCODEC_WERROR_OPTION} ${TORCH_CXX_FLAGS}")
 
 function(make_torchcodec_sublibrary
     library_name