https://llvm.org/bugs/show_bug.cgi?id=24623
Bug ID: 24623
Summary: Error on redefinition of builtin functions.
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: chengnian...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
I declare a variable with the name "rint", which accidentally is a builtin
function. Then clang rejects the code, although I do not include the header
file <math.h>.
Even though this behavior was deliberate, the message is still confusing,
"tmp.c:1:5: note: previous definition is here", as the first line is not the
the location of the previous definition.
$ clang-trunk -O0 -c tmp.c
tmp.c:1:5: error: redefinition of 'rint' as different kind of symbol
int rint;
^
tmp.c:1:5: note: previous definition is here
1 error generated.
$
$ gcc-trunk -O0 -c tmp.c
tmp.c:1:5: warning: built-in function ‘rint’ declared as non-function
int rint;
^
$
$ cat tmp.c
int rint;
$
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