agutowski added inline comments.
================
Comment at: test/Sema/implicit-intel-builtin-decl.c:4
@@ +3,3 @@
+void f() {
+ (void)_mm_getcsr(); // expected-warning{{implicitly declaring library
function '_mm_getcsr'}} \
+ // expected-note{{include the header <xmmintrin.h> or explicitly provide a
declaration for '_mm_getcsr'}}
----------------
rnk wrote:
> Can you add a C++ test? I think you'll get "undeclared identifier
> '_mm_getcsr'" instead of this helpful diagnostic.
This diagnostic works also in C++, although that's not the case with _byteswap
functions - if they are LIBBUILTINs, the C++ diagnostic doesn't work, and
LANGBUILTINs doesn't have header dependencies. I can create another thing like
TARGET_HEADER_BUILTIN, but I don't know if that's a good idea.
https://reviews.llvm.org/D24330
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