Re: [Qemu-devel] [BUGFIX][PATCH v2] configure: Disable libtool if -fPIE does not work with it (bug #1257099)

[Don Slutz <dslutz@verizon.com>]

On 01/02/14 21:12, Don Slutz wrote:

Ping.

> Adjust TMPO and added TMPB, TMPL, and TMPA.  libtool needs the names
> to be fixed (TMPB).
>
> Add new functions do_libtool and libtool_prog.
>
> Add check for broken gcc and libtool.
>
> Signed-off-by: Don Slutz <dslutz@verizon.com>
> ---
> Was posted as an attachment.
>
> https://lists.gnu.org/archive/html/qemu-devel/2013-12/msg02678.html
>
>   configure | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>   1 file changed, 62 insertions(+), 1 deletion(-)
>
> diff --git a/configure b/configure
> index edfea95..852d021 100755
> --- a/configure
> +++ b/configure
> @@ -12,7 +12,10 @@ else
>   fi
>   
>   TMPC="${TMPDIR1}/qemu-conf-${RANDOM}-$$-${RANDOM}.c"
> -TMPO="${TMPDIR1}/qemu-conf-${RANDOM}-$$-${RANDOM}.o"
> +TMPB="qemu-conf-${RANDOM}-$$-${RANDOM}"
> +TMPO="${TMPDIR1}/${TMPB}.o"
> +TMPL="${TMPDIR1}/${TMPB}.lo"
> +TMPA="${TMPDIR1}/lib${TMPB}.la"
>   TMPE="${TMPDIR1}/qemu-conf-${RANDOM}-$$-${RANDOM}.exe"
>   
>   # NB: do not call "exit" in the trap handler; this is buggy with some shells;
> @@ -86,6 +89,38 @@ compile_prog() {
>     do_cc $QEMU_CFLAGS $local_cflags -o $TMPE $TMPC $LDFLAGS $local_ldflags
>   }
>   
> +do_libtool() {
> +    local mode=$1
> +    shift
> +    # Run the compiler, capturing its output to the log.
> +    echo $libtool $mode --tag=CC $cc "$@" >> config.log
> +    $libtool $mode --tag=CC $cc "$@" >> config.log 2>&1 || return $?
> +    # Test passed. If this is an --enable-werror build, rerun
> +    # the test with -Werror and bail out if it fails. This
> +    # makes warning-generating-errors in configure test code
> +    # obvious to developers.
> +    if test "$werror" != "yes"; then
> +        return 0
> +    fi
> +    # Don't bother rerunning the compile if we were already using -Werror
> +    case "$*" in
> +        *-Werror*)
> +           return 0
> +        ;;
> +    esac
> +    echo $libtool $mode --tag=CC $cc -Werror "$@" >> config.log
> +    $libtool $mode --tag=CC $cc -Werror "$@" >> config.log 2>&1 && return $?
> +    error_exit "configure test passed without -Werror but failed with -Werror." \
> +        "This is probably a bug in the configure script. The failing command" \
> +        "will be at the bottom of config.log." \
> +        "You can run configure with --disable-werror to bypass this check."
> +}
> +
> +libtool_prog() {
> +    do_libtool --mode=compile $QEMU_CFLAGS -c -fPIE -DPIE -o $TMPO $TMPC || return $?
> +    do_libtool --mode=link $LDFLAGS -o $TMPA $TMPL -rpath /usr/local/lib
> +}
> +
>   # symbolically link $1 to $2.  Portable version of "ln -sf".
>   symlink() {
>     rm -rf "$2"
> @@ -1367,6 +1402,32 @@ EOF
>     fi
>   fi
>   
> +# check for broken gcc and libtool in RHEL5
> +if test -n "$libtool" -a "$pie" != "no" ; then
> +  cat > $TMPC <<EOF
> +
> +void *f(unsigned char *buf, int len);
> +void *g(unsigned char *buf, int len);
> +
> +void *
> +f(unsigned char *buf, int len)
> +{
> +    return (void*)0L;
> +}
> +
> +void *
> +g(unsigned char *buf, int len)
> +{
> +    return f(buf, len);
> +}
> +
> +EOF
> +  if ! libtool_prog; then
> +    echo "Disabling libtool due to broken toolchain support"
> +    libtool=
> +  fi
> +fi
> +
>   ##########################################
>   # __sync_fetch_and_and requires at least -march=i486. Many toolchains
>   # use i686 as default anyway, but for those that don't, an explicit