[C++ PATCH] (temporarily) undefine __cpp_consteval

[Jakub Jelinek]

Hi!

When submitting the P1902R1 patch for missing feature macros, I
completely forgot that we can't claim consteval support, because we have
the
  /* FIXME: For now.  */
  if (virtualp && (inlinep & 8) != 0)
    {
      sorry_at (DECL_SOURCE_LOCATION (decl),
                "%<virtual%> %<consteval%> method %qD not supported yet",
                decl);
      inlinep &= ~8;
    }
limitation in consteval support.  I've tried to make some progress on it
in PR88335, but am stuck, so this patch instead comments out this and
updates cxx-status.html to explain the partial support.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk and
wwwdocs?

2019-11-29  Jakub Jelinek  <ja...@redhat.com>

        * c-cppbuiltin.c (c_cpp_builtins): Don't define __cpp_consteval for
        now.

        * g++.dg/cpp2a/feat-cxx2a.C: Don't test __cpp_consteval for now.

--- gcc/c-family/c-cppbuiltin.c.jj      2019-11-28 09:02:23.705869433 +0100
+++ gcc/c-family/c-cppbuiltin.c 2019-11-28 18:59:20.407918255 +0100
@@ -999,7 +999,7 @@ c_cpp_builtins (cpp_reader *pfile)
          cpp_define (pfile, "__cpp_designated_initializers=201707L");
          cpp_define (pfile, "__cpp_constexpr_in_decltype=201711L");
          cpp_define (pfile, "__cpp_conditional_explicit=201806L");
-         cpp_define (pfile, "__cpp_consteval=201811L");
+         /* cpp_define (pfile, "__cpp_consteval=201811L"); */
          cpp_define (pfile, "__cpp_constinit=201907L");
          cpp_define (pfile, "__cpp_deduction_guides=201907L");
          cpp_define (pfile, "__cpp_nontype_template_parameter_class=201806L");
--- gcc/testsuite/g++.dg/cpp2a/feat-cxx2a.C.jj  2019-11-28 09:02:25.331844453 
+0100
+++ gcc/testsuite/g++.dg/cpp2a/feat-cxx2a.C     2019-11-28 19:00:59.459400136 
+0100
@@ -520,11 +520,13 @@
 #  error "__cpp_constexpr_in_decltype != 201711"
 #endif
 
+/* Not supported fully yet:
 #ifndef __cpp_consteval
 #  error "__cpp_consteval"
 #elif __cpp_consteval != 201811
 #  error "__cpp_consteval != 201811"
 #endif
+*/
 
 #ifndef __cpp_concepts
 #  error "__cpp_concepts"

        Jakub

diff --git a/htdocs/projects/cxx-status.html b/htdocs/projects/cxx-status.html
index c6ff78e1..c8655a17 100644
--- a/htdocs/projects/cxx-status.html
+++ b/htdocs/projects/cxx-status.html
@@ -288,7 +288,8 @@
     <tr>
       <td> Immediate functions (consteval) </td>
       <td><a href="http://wg21.link/p1073r3";>P1073R3</a></td>
-      <td class="supported"> <a href="../gcc-10/changes.html#cxx">10</a> </td>
+      <td class="supported"> <a href="../gcc-10/changes.html#cxx">10</a>
+        (partial, no <code>consteval virtual</code> support) </td>
       <td> __cpp_consteval &gt;= 201811 </td>
     </tr>
     <tr>