On Jun 4, 2008, at 9:29 AM, Chris Lattner wrote:
Suppose the linker is invoked on a
sequence of object files, some with with LTO information, some
without, all interspersed. Suppose some symbols are defined in
multiple .o files, through the use of common symbols, weak symbols,
and/or section groups. The LLVM interface simply passes each object
file to the plugin.
No, the native linker handles all the native .o files.
Incidentally, this is very easy to verify, as you can download this
today and try it out. LTO works fine in the Xcode 3.1 beta, which is
available off developer.apple.com, including when you mix and match
LLVM-compiled LTO .o files with GCC compiled ones.
For example, this works fine and does LTO across a.c/b.cpp/c.m:
llvm-gcc a.c -O4 -o a.o -c
llvm-g++ b.cpp -O4 -o b.o -c
llvm-gcc c.m -O4 -o c.o -c
gcc d.m -O3 -o d.o -c
g++ a.o b.o c.o d.o -o a.out
-Chris
