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Re: [google/gcc-4_7] Allow static const floats unless -pedantic is passed (issue6212051)


Looks good to me. Yay for kicking the can down the road. ;)

On Tue, May 15, 2012 at 12:57 PM, Ollie Wild <aaw@google.com> wrote:
> To be applied to google/gcc-4_7.
>
> Allow static const floats unless -pedantic is passed.
>
> This patch allows us to migrate to C++11 more incrementally, since we can leave
> the static const float initializations in place, flip the switch, and then
> change it to use constexpr.
>
> This is a forward port of r180638 from google/gcc-4_6 (despite the fact that
> that revision says to NOT forward-port this). ?Minor additional fixups have
> been applied.
>
> 2012-05-15 ? Ollie Wild ?<aaw@google.com>
>
> ? ? ? ?* gcc/cp/decl.c (check_static_variable_definition): Only generate a
> ? ? ? ?constexpr warning when -pedantic is enabled.
> ? ? ? ?* gcc/testsuite/g++.dg/cpp0x/constexpr-static8.C: Replace -fpermissive
> ? ? ? ?with -pedantic.
> ? ? ? ?* gcc/testsuite/g++.dg/cpp0x/constexpr-static8_nonpedantic.C: New test.
> ? ? ? ?* gcc/testsuite/g++.old-deja/g++.ext/memconst.C: Compile with -pedantic
> ? ? ? ?-pedantic-errors to work around test failures with -std=gnu++11.
>
> diff --git a/gcc/cp/decl.c b/gcc/cp/decl.c
> index bb26d15..d2fe731 100644
> --- a/gcc/cp/decl.c
> +++ b/gcc/cp/decl.c
> @@ -7861,9 +7861,18 @@ check_static_variable_definition (tree decl, tree type)
> ? ? ? ?error ("in-class initialization of static data member %q#D of "
> ? ? ? ? ? ? ? "incomplete type", decl);
> ? ? ? else if (literal_type_p (type))
> - ? ? ? permerror (input_location,
> - ? ? ? ? ? ? ? ? ?"%<constexpr%> needed for in-class initialization of "
> - ? ? ? ? ? ? ? ? ?"static data member %q#D of non-integral type", decl);
> + ? ? ? {
> + ? ? ? ? ?/* FIXME google: This local modification allows us to
> + ? ? ? ? ? ? transition from C++98 to C++11 without moving static
> + ? ? ? ? ? ? const floats out of the class during the transition. ?It
> + ? ? ? ? ? ? should not be forward-ported to a 4.8 branch, since by
> + ? ? ? ? ? ? then we should be able to just fix the code to use
> + ? ? ? ? ? ? constexpr. ?*/
> + ? ? ? ? ?pedwarn (input_location, OPT_pedantic,
> + ? ? ? ? ? ? ? ? ? "%<constexpr%> needed for in-class initialization of "
> + ? ? ? ? ? ? ? ? ? "static data member %q#D of non-integral type", decl);
> + ? ? ? ? ?return 0;
> + ? ? ? }
> ? ? ? else
> ? ? ? ?error ("in-class initialization of static data member %q#D of "
> ? ? ? ? ? ? ? "non-literal type", decl);
> diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-static8.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-static8.C
> index 7c84cf8..658a458 100644
> --- a/gcc/testsuite/g++.dg/cpp0x/constexpr-static8.C
> +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-static8.C
> @@ -1,5 +1,5 @@
> ?// PR c++/50258
> -// { dg-options "-std=c++0x -fpermissive" }
> +// { dg-options "-std=c++0x -pedantic" }
>
> ?struct Foo {
> ? static const double d = 3.14; // { dg-warning "constexpr" }
> diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-static8_nonpedantic.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-static8_nonpedantic.C
> new file mode 100644
> index 0000000..28d34a1
> --- /dev/null
> +++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-static8_nonpedantic.C
> @@ -0,0 +1,7 @@
> +// PR c++/50258
> +// { dg-options "-std=c++0x" }
> +
> +struct Foo {
> + ?static const double d = 3.14; // no warning
> +};
> +const double Foo::d;
> diff --git a/gcc/testsuite/g++.old-deja/g++.ext/memconst.C b/gcc/testsuite/g++.old-deja/g++.ext/memconst.C
> index d934763..7e86156 100644
> --- a/gcc/testsuite/g++.old-deja/g++.ext/memconst.C
> +++ b/gcc/testsuite/g++.old-deja/g++.ext/memconst.C
> @@ -1,5 +1,5 @@
> ?// { dg-do assemble ?}
> -// { dg-options "" }
> +// { dg-options "-pedantic -pedantic-errors" }
> ?// From: Ove.Ewerlid@syscon.uu.se (Ove Ewerlid)
> ?// Subject: ss-940630:cc1plus: internal error
> ?// Date: Sat, 2 Jul 1994 05:07:20 +0200
>
> --
> This patch is available for review at http://codereview.appspot.com/6212051


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