Re: [Qemu-devel] [PATCH] split c and cxx extra flags

[Stefan Hajnoczi]

On Fri, Jun 02, 2017 at 02:07:26PM +0100, Bruno Dominguez wrote:
> There was no possibility to add specific cxx flags using the configure
> file. So A new entrance has been created to support it.
> 
> Duplication of information in configure and rules.mak. Taking
> QEMU_CFLAGS and add them to QEMU_CXXFLAGS, now the value of
> QEMU_CXXFLAGS is stored in config-host.mak, so there is no need for
> it.
> 
> The makefile for libvixl was adding flags for QEMU_CXXFLAGS in
> QEMU_CFLAGS because of the addition in rules.mak. That was removed, so
> adding them where it should be.
> 
> -----
> Signed-off-by: Bruno Dominguez <address@hidden>
> -----

Please follow the code submission guidelines:
http://wiki.qemu.org/Contribute/SubmitAPatch

 * The commit message (email subject) should have a prefix describing
   the affected component.  Use "git log ./configure" for inspiration.
   I suggest the following:

     configure: split c and cxx extra flags

 * Use git-format-patch(1) so that your patch applies cleanly.  Your
   email has:

   ----
   Signed-off-by: ...
   ----

   This is not the format recognized by tools.  Instead the
   Signed-off-by: should be part of the commit description (no '----')
   and then a line with just three hyphens ('---') denotes the end of
   the commit description:

   Signed-off-by: ...
   ---

 * The email must not be line-wrapped since that breaks the patch.  If
   you use git-send-email(1) to submit patches then this is taken care
   of automatically.

> @@ -1304,6 +1312,7 @@ Advanced options (experts only):
>    --cxx=CXX                use C++ compiler CXX [$cxx]
>    --objcc=OBJCC            use Objective-C compiler OBJCC [$objcc]
>    --extra-cflags=CFLAGS    append extra C compiler flags QEMU_CFLAGS
> +  --extra-cxxflags=CXXFLAGS append extra CXX compiler flags QEMU_CXXFLAGS

For consistency with the --cxx= option description:

s/CXX compiler/C++ compiler/

> @@ -1489,37 +1498,6 @@ if test "$bogus_os" = "yes"; then
>      error_exit "Unrecognized host OS $targetos"
>  fi
> 
> -# Check that the C++ compiler exists and works with the C compiler
> -if has $cxx; then
> -    cat > $TMPC <<EOF
> -int c_function(void);
> -int main(void) { return c_function(); }
> -EOF
> -
> -    compile_object
> -
> -    cat > $TMPCXX <<EOF
> -extern "C" {
> -   int c_function(void);
> -}
> -int c_function(void) { return 42; }
> -EOF
> -
> -    update_cxxflags
> -
> -    if do_cxx $QEMU_CXXFLAGS -o $TMPE $TMPCXX $TMPO $LDFLAGS; then
> -        # C++ compiler $cxx works ok with C compiler $cc
> -        :
> -    else
> -        echo "C++ compiler $cxx does not work with C compiler $cc"
> -        echo "Disabling C++ specific optional code"
> -        cxx=
> -    fi
> -else
> -    echo "No C++ compiler available; disabling C++ specific optional code"
> -    cxx=
> -fi
> -

Why move this code?

> 
> Bruno
> 

This signature will break tools that apply the patch.  It's easiest to
use git-send-email(1) to avoid problems like this.

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