Emit a variable defined in gcc

Hello, I am working on a gcc patch for asan. The patch is almost ready except one thing. To make sure that the user has applied this patch before using asan feature, I want to declare an additional variable in gcc which is referenced by our source code so that if this patch is missing, the user get

Emit a variable defined in gcc

Hello, I am working on a gcc patch for asan. The patch is almost ready except one thing. To make sure that the user has applied this patch before using asan feature, I want to declare an additional variable in gcc which is referenced by our source code so that if this patch is missing, the user get