https://bugs.llvm.org/show_bug.cgi?id=34557
Bug ID: 34557
Summary: Builtin prototypes are implicitly defined
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Frontend
Assignee: unassignedclangb...@nondot.org
Reporter: jo...@netbsd.org
CC: llvm-bugs@lists.llvm.org
A common way to do autoconf-style tests for declarations in headers uses the
following approach:
int main(void) { (void)strlcpy; return 0; }
This should fail with unknown identifier errors, but currently passes with a
implicit prototype warning for GNUish language modes (i.e. gnu89, gnu99 etc).
It fails for "unknown" identifiers like strlcpy2. This is a pretty bad error as
it can lead to incorrect autodetection of system headers.
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