Re: BUG #17160: PostgreSQL13.4:Build failure with GNU Compiler.

PG Bug reporting form <noreply(at)postgresql(dot)org> writes:
> GCC Build Command:
> CC=gcc CXX=g++ ../configure --prefix=<pathtoInstall> CFLAGS='-O3
> -march=native -flto' CXXFLAGS='-O3 -march=native -flto'
> build errror:
> /tmp/zic.soWwyC.ltrans0.ltrans.o:<artificial>:(.text.startup+0xf7b): more
> undefined references to `pg_fprintf' follow
> /tmp/zic.soWwyC.ltrans0.ltrans.o: In function `main':
> <artificial>:(.text.startup+0xfe9): undefined reference to `pg_strerror'
> <artificial>:(.text.startup+0x1009): undefined reference to `pg_fprintf'
> collect2: error: ld returned 1 exit status
> make[2]: *** [Makefile:55: zic] Error 1

> without flto build was success

Well, there's your answer. We don't support -flto, and I've not
heard any developers express great interest in making it work.
If somebody were to send in a patch, we might accept it; but
we're not going to treat this as a bug.

regards, tom lane