"H.J. Lu" <hjl.to...@gmail.com> writes:
> How do you deal with -lm:
I believe we have agreed that LTO can only introduce new symbol
references that are satisfied by -lc and -lgcc. Under those conditions,
I believe my proposal will work just fine.
Again, my proposal is this:
I propose that we add a new linker option: --plugin-callback. At each
point where this option appears on the command line, the linker will
call a new plugin callback entry point. The LTO plugin will replace the
all_symbols_read callback with this one. We will have the gcc driver
run the linker more or less like this:
object-files -lc -lgcc --plugin-callback -lc -lgcc crtend.o crtn.o
So if the user runs something like
gcc -o foo foo.o -lm -flto
gcc will execute something like
ld crt1.o crti.o crtbegin.o foo.o -lm
-lgcc --as-needed -lgcc_s --no-as-needed -lc -lgcc
--plugin-callback
-lc -lgcc --as-needed -lgcc_s --no-as-needed crtend.o crtn.o
Why would that not work?
Ian
