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https://freedesktop.org/bugzilla/show_bug.cgi?id=1698
Summary: RFE: Minimize symbol table in DRI drivers
Product: DRI
Version: XOrg CVS
Platform: PC
OS/Version: All
Status: NEW
Severity: enhancement
Priority: P3
Component: General
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
gcc4 (and earlier versions if patched, including gentoo's gcc3.4 and probably
redhat's too) includes an -fvisibility flag, which allows the compiler to change
the assumed symbol visibility for entire objects at once. traditional unix C
rules state that non-static symbols are exported from the DSO by default; this
usually means exporting many more symbols from the DSO than is strictly necessary.
The symbols that must be exported from the DRI driver should be explicitly
marked with __attribute__ ((visibility("default"))), so that the DRI drivers can
be built with -fvisibility=hidden and still work correctly. Note that marking
functions this way does not change behaviour for compilers that lack the
-fvisibility flag.
Currently a typical DRI driver exports ~1200 symbols, with ~100 of these defined
by the driver and the rest by the Mesa core. This can be reduced to 2 or 3 with
no loss in functionality. In addition to improving symbol resolution
performance, the compiler can generate (marginally) better code when it knows
that a symbol can't be referred to externally. As an example, r200_dri.so drops
about 70k of text from the driver binary when built with a minimal export list.
Other drivers show similar improvements.
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