http://llvm.org/bugs/show_bug.cgi?id=9375
Summary: __private_extern__ should not be recognized on
non-Darwin platforms
Product: clang
Version: trunk
Platform: PC
OS/Version: FreeBSD
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Currently, libdispatch's configure script tries to detect support for
__private_extern__ by simply seeing if a program containing it compiles.
Only if that compilation fails, does it attempt to use the other
approach of __attribute__((visibility("hidden"))).
However, on non-Darwin OSes, __private_extern__ results in a regular
extern symbol, and this causes symbols using it to be visible, leading
to link problems.
Of course, libdispatch's configure script can be fixed to only check for
__private_extern__ on Darwin.
However, if __private_extern__ is a Darwin-only feature, I think it
should simply result in a compile error on non-Darwin platforms. This
will prevent problems with any other scripts that try to detect this
feature.
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