https://bugs.llvm.org/show_bug.cgi?id=33871
Bug ID: 33871
Summary: "visibility does not match previous declaration" error
could be more useful
Product: clang
Version: 5.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: mh+l...@glandium.org
CC: llvm-bugs@lists.llvm.org
Reduced testcase:
#pragma GCC visibility push(hidden)
class Foo;
class __attribute__((visibility("default"))) Foo {
};
Compiling the above fails with:
test.cc:5:22: error: visibility does not match previous declaration
class __attribute__((visibility("default"))) Foo {
^
test.cc:1:13: note: previous attribute is here
#pragma GCC visibility push(hidden)
While technically entirely accurate, in real cases, the #pragma is not
necessarily close to the forward declaration, and it's really not obvious
what's wrong, and can lead to some unnecessary hair pulling.
The error message should mention the forward declaration somehow.
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