https://bugs.llvm.org/show_bug.cgi?id=44406
Bug ID: 44406
Summary: Const is not compile-time constant
Product: clang
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C
Assignee: unassignedclangb...@nondot.org
Reporter: mc...@gmx.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
const int a = 32;
typedef struct {
char c[a];
} d;
GCC: error: variably modified 'c' at file scope
CompCert: error: size of array is not a compile-time constant
Clang -Wextra: *compiles*
Clang -pedantic: warning: variable length array folded to constant array as an
extension [-Wgnu-folding-constant]
The problem? This is not a GNU extension. Either the warning is wrong or the
code that shouldn't compile compiles.
Weirdly, MSVC has the same behavior as Clang but does not issue a warning.
Once it is confirmed, I'll file an Apple bug report, because an Xcode header,
Security.framework/Headers/Authorization.h suffers from this issue and can only
be compiled with Clang (so when this bug is patched don't tell me that I broke
Apple's code :) )
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