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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
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Doing so would be inconsistent with the common fallback case where backend
diagnostics without source locations are emitted unconditionally.
llvm-svn: 210515
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GCC-compatible
It turns out the trailing '=' really is part of the option name spelling and
treating it as such gets us compatible with GCC's -Werror= and pragmas.
(GCC doesn't appear to support any -Wno- form for this diagnostic but we do.)
llvm-svn: 210503
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Add driver and frontend support for the GCC -Wframe-larger-than=bytes warning.
This is the first GCC-compatible backend diagnostic built around LLVM's
reporting feature.
This commit adds infrastructure to perform reverse lookup from mangled names
emitted after LLVM IR generation. We use that to resolve precise locations and
originating AST functions, lambdas or block declarations to produce seamless
codegen-guided diagnostics.
An associated change, StringMap now maintains unique mangled name strings
instead of allocating copies. This is a net memory saving in C++ and a small
hit for C where we no longer reuse IdentifierInfo storage, pending further
optimisation.
llvm-svn: 210293
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