On 11/28/23 11:03, Thomas Schwinge wrote:
Hi!
On 2023-11-17T14:50:45+0000, Alex Coplan <alex.cop...@arm.com> wrote:
--- a/gcc/cp/cp-objcp-common.cc
+++ b/gcc/cp/cp-objcp-common.cc
+/* Table of features for __has_{feature,extension}. */
+
+static constexpr cp_feature_info cp_feature_table[] =
+{
+ { "cxx_exceptions", &flag_exceptions },
+ { "cxx_rtti", &flag_rtti },
+ { "cxx_access_control_sfinae", { cxx11, cxx98 } },
Here we see that 'cxx_exceptions', 'cxx_rtti' are dependent on
'-fexceptions', '-frtti'. Certain GCC configurations may decide to
default to '-fno-exceptions' and/or '-fno-rtti'...
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/has-feature.C
@@ -0,0 +1,206 @@
+// { dg-do compile }
+// { dg-options "" }
+
+#define FEAT(x) (__has_feature(x) && __has_extension(x))
+#define CXX11 (__cplusplus >= 201103L)
+#define CXX14 (__cplusplus >= 201402L)
+
+#if !FEAT(cxx_exceptions) || !FEAT(cxx_rtti)
+#error
+#endif
..., but here, they are assumed available unconditionally. OK to push
"Adjust 'g++.dg/ext/has-feature.C' for default-'-fno-exceptions', '-fno-rtti'
configurations",
see attached?
OK.
Grüße
Thomas
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