[Bug c++/41791] New: LTO warnings with -Winline

["mckelvey at maskull dot com" <gcc-bugzilla at gcc dot gnu dot org>]

Simple program:

#include <string>

int

main(int,
     char **)
{
    std::string i;

    i = "abc";
}


Compiled as:

/usr/local/bin/g++ -O3 -Winline -flto -Werror \
-o zzzzz.exe zzzzz.cc -lintl

Gives:

In file included from
/usr/local/lib/gcc/alphaev56-unknown-linux-gnu/4.5.0/../../../../include/c++/4.5.0/bits/basic_string.h:296:0,
                 from :99:
zzzzz.cc: In function 'main':
/usr/local/lib/gcc/alphaev56-unknown-linux-gnu/4.5.0/../../../../include/c++/4.5.0/bits/basic_string.h:502:7:
warning: inlining failed in call to '__comp_dtor ': call is unlikely and code
size would grow
zzzzz.cc:9:17: warning: called from here


So, first, -Winline gives warnings in system code I have no control over,
Second, -Werror should have turned it into an error anyway.

Warning goes away if -flto is removed.





uname -a
Linux alpha1 2.4.9-40 #1 Mon Sep 23 08:14:02 EDT 2002 alpha unknown

g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/alphaev56-unknown-linux-gnu/4.5.0/lto-wrapper
Target: alphaev56-unknown-linux-gnu
Configured with: ../gcc/configure --verbose --enable-languages=c++
--disable-linux-futex --disable-nls --disable-tls --enable-lto
Thread model: posix
gcc version 4.5.0 20091017 (experimental) (GCC) 

BUILDING:
alias CONFIGURECVS='../gcc/configure --verbose --enable-languages=c++
--disable-linux-futex --disable-nls --disable-tls --enable-lto 2>&1 | tee clog'

alias BUILD='nice gmake CFLAGS='\'''\'' BOOT_CFLAGS='\'''\''
LIBCFLAGS='\''-g'\'' LIBCXXFLAGS='\''-g'\'' bootstrap 2>&1 | tee log'


-- 
           Summary: LTO warnings with -Winline
           Product: gcc
           Version: lto
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mckelvey at maskull dot com
 GCC build triplet: alphaev56-unknown-linux-gnu
  GCC host triplet: alphaev56-unknown-linux-gnu
GCC target triplet: alphaev56-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41791