[gcc r16-1428] libstdc++: Add _GLIBCXX_USE_BUILTIN_TRAIT to Doxygen config

[Jonathan Wakely]

https://gcc.gnu.org/g:72a98dc6e517eb7cdff1ac1cef11a18702aa6771

commit r16-1428-g72a98dc6e517eb7cdff1ac1cef11a18702aa6771
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu May 29 13:49:04 2025 +0100

    libstdc++: Add _GLIBCXX_USE_BUILTIN_TRAIT to Doxygen config
    
    This ensures that Doxygen sees the simpler definitions of type traits,
    which are implemented using the built-ins.
    
    Also add _GLIBCXX_HAVE_ICONV (which is less important) and fix some
    typos for _GLIBCXX_BEGIN_INLINE_ABI_NAMESPACE and
    _GLIBCXX_END_INLINE_ABI_NAMESPACE.
    
    libstdc++-v3/ChangeLog:
    
            * doc/doxygen/user.cfg.in (PREDEFINED): Remove -D prefixes from
            some macros. Define _GLIBCXX_USE_BUILTIN_TRAIT and
            _GLIBCXX_HAVE_ICONV macros.

Diff:
---
 libstdc++-v3/doc/doxygen/user.cfg.in | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libstdc++-v3/doc/doxygen/user.cfg.in b/libstdc++-v3/doc/doxygen/user.cfg.in
index e926c6707f67..536e035b0238 100644
--- a/libstdc++-v3/doc/doxygen/user.cfg.in
+++ b/libstdc++-v3/doc/doxygen/user.cfg.in
@@ -2350,8 +2350,8 @@ PREDEFINED             = __cplusplus=202002L \
                          "_GLIBCXX_END_NAMESPACE_CONTAINER= " \
                          "_GLIBCXX_END_NAMESPACE_CXX11= " \
                          "_GLIBCXX_END_NAMESPACE_LDBL= " \
-			 "-D_GLIBCXX_BEGIN_INLINE_ABI_NAMESPACE(X)= " \
-			 "-D_GLIBCXX_END_INLINE_ABI_NAMESPACE(X)= " \
+			 "_GLIBCXX_BEGIN_INLINE_ABI_NAMESPACE(X)= " \
+			 "_GLIBCXX_END_INLINE_ABI_NAMESPACE(X)= " \
                          "_GLIBCXX_TEMPLATE_ARGS=...  " \
                          "_GLIBCXX_DEPRECATED= " \
                          "_GLIBCXX_DEPRECATED_SUGGEST(E)= " \
@@ -2414,6 +2414,8 @@ PREDEFINED             = __cplusplus=202002L \
                          _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE \
                          _GLIBCXX_HAVE_IS_CONSTANT_EVALUATED \
                          _GLIBCXX_HAVE_BUILTIN_LAUNDER \
+			 "_GLIBCXX_USE_BUILTIN_TRAIT(X)=1" \
+			 _GLIBCXX_HAVE_ICONV=1 \
 			 "_GLIBCXX_DOXYGEN_ONLY(X)=X " \
 			 __exception_ptr=__unspecified__ \