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* [gcc r10-9044] libstdc++: Fix unconditional definition of __cpp_lib_span in <version> [PR 97869}
@ 2020-11-18 13:03 Jonathan Wakely
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From: Jonathan Wakely @ 2020-11-18 13:03 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:992643655c872f8332f9e8e453631a8fad52943a
commit r10-9044-g992643655c872f8332f9e8e453631a8fad52943a
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Nov 17 15:26:29 2020 +0000
libstdc++: Fix unconditional definition of __cpp_lib_span in <version> [PR 97869}
The <span> header is empty unless Concepts are supported, but <version>
defines the __cpp_lib_span feature test macro unconditionally. It should
be guarded by the same conditions as in <span>.
libstdc++-v3/ChangeLog:
PR libstdc++/97869
* include/precompiled/stdc++.h: Include <coroutine>.
* include/std/version (__cpp_lib_span): Check __cpp_lib_concepts
before defining.
(cherry picked from commit ecf65330c11544ebf35e198087b4a42be089c620)
Diff:
---
libstdc++-v3/include/precompiled/stdc++.h | 3 +++
libstdc++-v3/include/std/version | 4 +++-
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/precompiled/stdc++.h b/libstdc++-v3/include/precompiled/stdc++.h
index 7518a98c25a..5b8f6340448 100644
--- a/libstdc++-v3/include/precompiled/stdc++.h
+++ b/libstdc++-v3/include/precompiled/stdc++.h
@@ -137,6 +137,9 @@
#include <bit>
#include <compare>
#include <concepts>
+#if __cpp_impl_coroutine
+# include <coroutine>
+#endif
#include <numbers>
#include <ranges>
#include <span>
diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version
index c3a5bd26e63..e899a1e6d99 100644
--- a/libstdc++-v3/include/std/version
+++ b/libstdc++-v3/include/std/version
@@ -218,7 +218,9 @@
# define __cpp_lib_ranges 201911L
#endif
#define __cpp_lib_shift 201806L
-#define __cpp_lib_span 202002L
+#if __cpp_lib_concepts
+# define __cpp_lib_span 202002L
+#endif
#define __cpp_lib_ssize 201902L
#define __cpp_lib_starts_ends_with 201711L
#define __cpp_lib_to_address 201711L
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