[PATCH] D28526: [ARM] Add diagnostics when initialization global variables with ropi/rwpi

[Weiming Zhao via Phabricator via cfe-commits]

weimingz created this revision.
weimingz added reviewers: olista01, jmolloy.
weimingz added a subscriber: cfe-commits.
Herald added subscribers: rengolin, aemerson.

This patch adds diagnoses when initializing a global variable using the address of another global variable that uses ROPI/RWPI relocation model.

For example, 
int a;
extern void foo();
int *x = &a;            // we cannot statically initialize x with -frwpi 
void *y = &foo();  // we can't statically initialize y with -fropi

The above code will trigger diagnoses like:

  error: 'x' cannot be initialized using address of 'a' with 'rwpi' relocation


https://reviews.llvm.org/D28526

Files:
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/CodeGen/CGDecl.cpp
  lib/CodeGen/CodeGenModule.cpp
  lib/CodeGen/CodeGenModule.h
  test/CodeGen/arm-ropi-rwpi.c

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