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. Tested PGO/LTO builds for GDB and binutils with GCC 11 on Fedora 33. Changes from V2: 1. Pass PGO_BUILD_TRAINING=yes for PGO build training. 2. Set TESTS to gdb.dwarf2/*.exp for GDB PGO build training. 3. gnulib: Support variables from the top level Makefile. Changes from V1: 1. Pass -ffat-lto-objects together with -flto=jobserver. 2. Pass -i to make to ignore "make check" errors in PGO training runs. H.J. Lu (5): GCC: Pass --plugin to AR and RANLIB Binutils: Pass --plugin to AR and RANLIB Support the PGO build for binutils+gdb Set TESTS to gdb.dwarf2/*.exp for PGO build training gnulib: Support variables from the top level Makefile Makefile.in | 68 ++++++++++++- Makefile.tpl | 63 +++++++++++- bfd/configure | 27 ++++- binutils/configure | 27 ++++- config/gcc-plugin.m4 | 28 ++++++ configure | 139 ++++++++++++++++++++++++- configure.ac | 80 +++++++++++++++ gas/configure | 27 ++++- gdb/testsuite/Makefile.in | 5 + gnulib/Makefile.am | 39 ++++++++ gnulib/Makefile.in | 40 ++++++++ gprof/configure | 27 ++++- ld/configure | 27 ++++- libctf/configure | 27 ++++- libiberty/Makefile.in | 5 +- libiberty/aclocal.m4 | 1 + libiberty/configure | 37 +++++++ libiberty/configure.ac | 12 +++ libtool.m4 | 25 ++++- opcodes/configure | 27 ++++- zlib/configure | 206 +++++++++++++++++++++++++++++++++++++- 21 files changed, 907 insertions(+), 30 deletions(-) -- 2.29.2
