V3 [PATCH 0/5] Support the PGO build for binutils+gdb

[Segher Boessenkool]

On Sat, Dec 19, 2020 at 10:10:31AM -0800, H.J. Lu via Gcc-patches wrote:
> Add the --enable-pgo-build[=lto] configure option.  When binutils+gdb
> is not built together with GCC, --enable-pgo-build enables the PGO build:
> 
> 1. First build with -fprofile-generate.
> 2. Use "make maybe-check-*" to generate profiling data and pass -i to make
> to ignore errors when generating profiling data.
> 3. Use "make clean" to remove the previous build.
> 4. Rebuild with -fprofile-use.

Can this not use --with-build-config=?  As the user interface I mean,
you probably still need most of this code, but at least it will be more
obvious how to handle conflicts in user-specified options.


Segher