http://llvm.org/bugs/show_bug.cgi?id=19333
Bug ID: 19333
Summary: LLVM exports too many symbols (on Unix like systems
like Linux and Mac)
Product: Build scripts
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Makefiles
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
This doesn't apply to Windows because by default symbols are hidden in DLLs. On
Unix like systems like Linux and Mac though there are a bunch of symbols
exported that shouldn't be which increase startup time. There is a long and
annoying process of marking symbols to export for the libraries but for the
executables (which obviously shouldn't export any symbols unless they have a
plugin system) the flag -fvisibility=hidden should be a cheap and easy
optimization. Note that LLVM does not use runtime type information or
exceptions so I believe there shouldn't be very many problems however,
according to http://gcc.gnu.org/wiki/Visibility there also some other cases
(for example, static data members of templates that can cause this problem).
Using #pragma push for one's own code could be one way of quickly accomplishing
this.
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