在 2024/2/5 上午1:01, Xi Ruoyao 写道:
I have a question. I see that you often add compilation options in
BOOT_CFLAGS.
I also want to test it. Do you have a recommended set of compilation
options?
When I build a compiler for my system I use
{BOOT_{C,CXX,LD}FLAGS,{C,CXX,LD}FLAGS_FOR_TARGET}="-O3 -march=la664 -
mtune=la664 -pipe -fgraphite-identity -floop-nest-optimize -fipa-pta -
fdevirtualize-at-ltrans -fno-semantic-interposition -Wl,-O1 -Wl,--as-
needed"
and enable PGO (make profiledbootstrap) and LTO (--with-build-
config=bootstrap-lto).
All of them but GRAPHITE (-fgraphite-identity -floop-nest-optimize)
seems "pretty safe" on the architectures I have a hardware of. GRAPHITE
is causing bootstrap failure on AArch64 with GCC 13 (PR109929) if
combined with PGO and the real cause is still not found yet.
But when I do a test build I normally only enable the flags which may
help to catch some issues, for example when a change only affects LTO I
add --with-build-config=bootstrap-lto, when changing something related
to LASX I use -O3 -mlasx (or -O3 -march=la664) as BOOT_CFLAGS.
Thank you so much. I will try to add optimization options.
