introduce -fcallgraph-info option

[Alexandre Oliva]

On Nov  4, 2019, Richard Biener <rguenther@suse.de> wrote:

> I wonder why we shouldn't simply adjust aux_base_name to something
> else for -flto [in the driver].

About that, having tried to make sense of the current uses of
aux_base_name and of lto-wrapper, three main possibilities occur to me:

a) adjust the driver code to accept -auxbase, and have lto-wrapper
explicitly pass -aux-base ${output_dir-.}/$(lbasename ${output_name}) or
somesuch for each -fltrans command;

b) introduce -auxdir and get lto-wrapper to pass -auxdir ${output_dir-.}
for each -fltrans (and offload) command; or

c) get -fltrans to implicitly adjust aux_base_name with the directory
passed to -dumpdir, if any, or . otherwise

Any preferences?

-- 
Alexandre Oliva, freedom fighter   he/him   https://FSFLA.org/blogs/lxo
Free Software Evangelist           Stallman was right, but he's left :(
GNU Toolchain Engineer    FSMatrix: It was he who freed the first of us
FSF & FSFLA board member                The Savior shall return (true);