build(c): set -Og -ggdb and warn about Conda setting -O2

Fixes #1608.

c/cmake_modules/AdbcDefines.cmake

@@ -60,8 +60,8 @@ if(CXX_LINKER_SUPPORTS_VERSION_SCRIPT)
 endif()
 
 # Set common build options
+string(TOLOWER "${CMAKE_BUILD_TYPE}" _lower_build_type)
 if("${ADBC_BUILD_WARNING_LEVEL}" STREQUAL "")
-  string(TOLOWER "${CMAKE_BUILD_TYPE}" _lower_build_type)
   if("${_lower_build_type}" STREQUAL "release")
     set(ADBC_BUILD_WARNING_LEVEL "PRODUCTION")
   else()
@@ -92,6 +92,26 @@ elseif(CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang"
       -Werror
       -Wno-unused-parameter)
   set(ADBC_C_CXX_FLAGS_PRODUCTION -Wall)
+
+  if(NOT CMAKE_C_FLAGS_DEBUG MATCHES "-O")
+    string(APPEND CMAKE_C_FLAGS_DEBUG " -Og")
+  endif()
+  if(NOT CMAKE_CXX_FLAGS_DEBUG MATCHES "-O")
+    string(APPEND CMAKE_CXX_FLAGS_DEBUG " -Og")
+  endif()
+
+  if(NOT CMAKE_C_FLAGS_DEBUG MATCHES "-g")
+    string(APPEND CMAKE_C_FLAGS_DEBUG " -g3")
+  endif()
+  if(NOT CMAKE_CXX_FLAGS_DEBUG MATCHES "-g")
+    string(APPEND CMAKE_CXX_FLAGS_DEBUG " -g3")
+  endif()
+  if(NOT CMAKE_C_FLAGS_RELWITHDEBINFO MATCHES "-g")
+    string(APPEND CMAKE_C_FLAGS_RELWITHDEBINFO " -g3")
+  endif()
+  if(NOT CMAKE_CXX_FLAGS_RELWITHDEBINFO MATCHES "-g")
+    string(APPEND CMAKE_CXX_FLAGS_RELWITHDEBINFO " -g3")
+  endif()
 else()
   message(WARNING "Unknown compiler: ${CMAKE_CXX_COMPILER_ID}")
 endif()