[Bug driver/66657] New: Feature request - assembly output from lto compiler

[kalmquist1 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66657

            Bug ID: 66657
           Summary: Feature request - assembly output from lto compiler
           Product: gcc
           Version: 4.8.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: driver
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kalmquist1 at hotmail dot com
  Target Milestone: ---

There should be a gcc command line option to generate the assembly language
output of the lto compiler.  The -S option doesn't do this because it prevents
the lto compilation phase from running at all.

Currently, the only way to accomplish this is to run the lto compiler directly,
as in the following example:

  ld -r -plugin /usr/lib/gcc/x86_64-linux-gnu/4.8/liblto_plugin.so \
     -plugin-opt=/bin/true -plugin-opt=-fresolution=out.res in1.o in2.o
  /usr/lib/gcc/x86_64-linux-gnu/4.8/lto1 -quiet \
     -fresolution=out.res -o out.s -O2 in1.o in2.o

This is ugly and undocumented.