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Prevent link warnings due to -Wframe-larger-than= 

Although this is nominally a -W option, we actually handle it in the driver
exactly as an f-group flag that's translated directly to -mllvm.

That means f_Group (and unintuitively, not W_Group) has the semantics we want
to make it behave like a standard warning flag: no automatic forwarding, no
warning for link invocations and compile-only.

Silences diagnostics like:

  [691/1545] Linking CXX executable bin/llvm-diff
  clang-3.5: warning: argument unused during compilation: '-Wframe-larger-than=2048'

(Hopefully we can move towards handling these in the frontend but that'll
require some infrastructure work.)

llvm-svn: 212670
This commit is contained in:
Alp Toker 2014-07-10 02:13:29 +00:00
parent 677539d0af
commit e81b42fde9
2 changed files with 6 additions and 1 deletions
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3
clang/include/clang/Driver/Options.td
View File

@ -862,10 +862,11 @@ def Wlarge_by_value_copy_def : Flag<["-"], "Wlarge-by-value-copy">,
"in bytes than a given value">, Flags<[HelpHidden]>;
def Wlarge_by_value_copy_EQ : Joined<["-"], "Wlarge-by-value-copy=">, Flags<[CC1Option]>;
// These "special" warning flags are effectively processed as f_Group flags by the driver:
// Just silence warnings about -Wlarger-than for now.
def Wlarger_than_EQ : Joined<["-"], "Wlarger-than=">, Group<clang_ignored_f_Group>;
def Wlarger_than_ : Joined<["-"], "Wlarger-than-">, Alias<Wlarger_than_EQ>;
def Wframe_larger_than_EQ : Joined<["-"], "Wframe-larger-than=">, Flags<[DriverOption]>;
def Wframe_larger_than_EQ : Joined<["-"], "Wframe-larger-than=">, Group<f_Group>, Flags<[DriverOption]>;
def : Flag<["-"], "fterminated-vtables">, Alias<fapple_kext>;
def fthreadsafe_statics : Flag<["-"], "fthreadsafe-statics">, Group<f_Group>;

4
clang/test/Misc/backend-stack-frame-diagnostics.cpp
View File

@ -6,6 +6,10 @@
// * The driver passes the option through to the backend.
// * The frontend diagnostic handler 'demangles' and resolves the correct function definition.
// Test that link invocations don't emit an "argument unused during compilation" diagnostic.
// RUN: touch %t.o
// RUN: %clang -Werror -Wframe-larger-than=0 %t.o -### 2>&1 | not grep ' error: '
// TODO: Support rich backend diagnostics for Objective-C methods.
// Backend diagnostics aren't suppressed in system headers because such results