Improve handling of enumerator values for C and C++, including:

  - In C++, prior to the closing '}', set the type of enumerators
    based on the type of their initializer. Don't perform unary
    conversions on the enumerator values.
  - In C++, handle overflow when an enumerator has no initializer and
    its value cannot be represented in the type of the previous
    enumerator.
  - In C, handle overflow more gracefully, by complaining and then
    falling back to the C++ rules.
  - In C, if the enumerator value is representable in an int, convert the
    expression to the type 'int'.

Fixes PR5854 and PR4515.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95031 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/test/Sema/enum.c b/test/Sema/enum.c
index 916de41176..9b4650091e 100644
--- a/test/Sema/enum.c
+++ b/test/Sema/enum.c
@@ -92,3 +92,7 @@ typedef enum {
 } an_enum;
 // FIXME: why is this only a warning?
 char * s = (an_enum) an_enumerator; // expected-warning {{incompatible integer to pointer conversion initializing 'an_enum', expected 'char *'}}
+
+// PR4515
+enum PR4515 {PR4515a=1u,PR4515b=(PR4515a-2)/2};
+int CheckPR4515[PR4515b==0?1:-1];