On 17 June 2016 at 08:38, Bertram, Alexander wrote: > Hi there, > > I'm trying to get the gcc-bridge plugin to dump out a list of _all_ > global variables declared within a translation unit, even if they're > not used, and I've really hit a brick wall. Can anyone point me in the > right direction? > > In more detail, say that you have a C source file consisting only of: > > int magic_number = 42; > > With no functions declared. The global variable and its data is > written to the object file: > > $ gcc -c link1.c > $ nm link1.o > 0000000000000000 D magic_number > > But the global variable is not referenced by any functions so the > plugin never encounters it and doesn't know it exists. If I understand correctly, all the current plugin hooks are in the code-generation stages. If a variable is unused and so never gets emitted by the front-end, then the code-gen passes won't see it, and your plugin won't see it. I want to write a plugin that inspects the names of all declarations, including unused variables/functions and uninstantiated templates, but it can't be done today. I opened https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70757 to ask for extra plugin hooks.
