[gcc r11-5636] libstdc++: Make preprocessor checks for __cpp_lib_atomic_wait consistent

[Jonathan Wakely]

https://gcc.gnu.org/g:670f5095e4aacc30099f6b73c1e67c06df76f36b

commit r11-5636-g670f5095e4aacc30099f6b73c1e67c06df76f36b
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Dec 2 00:39:22 2020 +0000

    libstdc++: Make preprocessor checks for __cpp_lib_atomic_wait consistent
    
    This changes some #ifdef checks to use #if instead.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/atomic_timed_wait.h: Use #if instead of #ifdef.
            * include/bits/semaphore_base.h: Likewise.
            * include/std/version: Remove trailing whitespace.

Diff:
---
 libstdc++-v3/include/bits/atomic_timed_wait.h | 2 +-
 libstdc++-v3/include/bits/semaphore_base.h    | 2 +-
 libstdc++-v3/include/std/version              | 4 ++--
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/libstdc++-v3/include/bits/atomic_timed_wait.h b/libstdc++-v3/include/bits/atomic_timed_wait.h
index 6dd1a145e69..83438ae31ed 100644
--- a/libstdc++-v3/include/bits/atomic_timed_wait.h
+++ b/libstdc++-v3/include/bits/atomic_timed_wait.h
@@ -34,7 +34,7 @@
 
 #include <bits/atomic_wait.h>
 
-#ifdef __cpp_lib_atomic_wait
+#if __cpp_lib_atomic_wait
 #include <bits/functional_hash.h>
 
 #include <chrono>
diff --git a/libstdc++-v3/include/bits/semaphore_base.h b/libstdc++-v3/include/bits/semaphore_base.h
index 0ed1f5895af..e4e57de4acf 100644
--- a/libstdc++-v3/include/bits/semaphore_base.h
+++ b/libstdc++-v3/include/bits/semaphore_base.h
@@ -33,7 +33,7 @@
 #pragma GCC system_header
 
 #include <bits/atomic_base.h>
-#ifdef __cpp_lib_atomic_wait 
+#if __cpp_lib_atomic_wait
 #include <bits/atomic_timed_wait.h>
 
 #include <ext/numeric_traits.h>
diff --git a/libstdc++-v3/include/std/version b/libstdc++-v3/include/std/version
index 4bb45b7805c..25f628f399d 100644
--- a/libstdc++-v3/include/std/version
+++ b/libstdc++-v3/include/std/version
@@ -219,7 +219,7 @@
 #ifdef _GLIBCXX_HAS_GTHREADS
 # define __cpp_lib_jthread 201911L
 #endif
-#if __cpp_lib_atomic_wait 
+#if __cpp_lib_atomic_wait
 # define __cpp_lib_latch 201907L
 #endif
 #define __cpp_lib_list_remove_return_type 201806L
@@ -231,7 +231,7 @@
 #if __cpp_lib_concepts
 # define __cpp_lib_ranges 201911L
 #endif
-#if __cpp_lib_atomic_wait 
+#if __cpp_lib_atomic_wait
 # define __cpp_lib_semaphore 201907L
 #endif
 #define __cpp_lib_shift 201806L