GNU bug report logs - #39611
coreutils v8.31 fails to compile with -Ofast

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: zsugabubus <zsugabubus <at> national.shitposting.agency>
To: bug-coreutils <at> gnu.org
Subject: coreutils v8.31 fails to compile with -Ofast
Date: Sat, 15 Feb 2020 00:21:30 +0100

Hi,

$ export CFLAGS=-Ofast # Works with -O3
$ ./configure && make

/usr/bin/ld: lib/libcoreutils.a(strtold.o):(.data+0x0): multiple definition of `minus_zero'; lib/libcoreutils.a(strtod.o):(.data+0x0): first defined here
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:8537: src/od] Error 1
make[2]: *** Waiting for unfinished jobs....
  CCLD     src/printf
make[2]: Leaving directory '/build/upstream'
make[1]: *** [Makefile:12165: all-recursive] Error 1
make[1]: Leaving directory '/build/upstream'
make: *** [Makefile:6351: all] Error 2
make: Leaving directory '/build/upstream'

-- 
zsugabubus

Message #8 received at 39611 <at> debbugs.gnu.org (full text, mbox):

From: Paul Eggert <eggert <at> cs.ucla.edu>
To: zsugabubus <zsugabubus <at> national.shitposting.agency>
Cc: 39611 <at> debbugs.gnu.org
Subject: Re: bug#39611: coreutils v8.31 fails to compile with -Ofast
Date: Fri, 14 Feb 2020 17:08:47 -0800

On 2/14/20 3:21 PM, zsugabubus wrote:
> $ export CFLAGS=-Ofast # Works with -O3
> $ ./configure && make

Coreutils (and many other programs) is not compatible with -Ofast, which is not 
surprising as -Ofast is documented to not work in many cases. The obvious 
workaround is to not use -Ofast.

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