libstdc++: Remove unnecessary uses of <stdint.h>

We don't need to include all of <stdint.h> when we only need uintptr_t
from it. By using GCC's internal macro we avoid unnecessarily declaring
everything in <stdint.h>. This helps users to avoid accidentally relying
on those names being declared without explicitly including the header.

libstdc++-v3/ChangeLog:

	* include/bits/align.h (align, assume_aligned): Use
	__UINTPTR_TYPE__ instead of uintptr_t. Do not include
	<stdint.h>.
	* include/bits/atomic_base.h (__atomic_ref): Likewise.
	* include/bits/atomic_wait.h (__waiter_pool_base::_S_for):
	Likewise.
	* include/std/atomic: Include <cstdint>.

4 files changed, 17 insertions, 10 deletions

diff --git a/libstdc++-v3/include/bits/align.h b/libstdc++-v3/include/bits/align.h
index 1a06b81..0c64584 100644
--- a/libstdc++-v3/include/bits/align.h
+++ b/libstdc++-v3/include/bits/align.h
@@ -31,7 +31,6 @@
 #define _GLIBCXX_ALIGN_H 1
 
 #include <bit>          // std::has_single_bit
-#include <stdint.h>     // uintptr_t
 #include <debug/assertions.h> // _GLIBCXX_DEBUG_ASSERT
 #include <bits/version.h>
 
@@ -62,7 +61,7 @@ align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept
 {
   if (__space < __size)
     return nullptr;
-  const auto __intptr = reinterpret_cast<uintptr_t>(__ptr);
+  const auto __intptr = reinterpret_cast<__UINTPTR_TYPE__>(__ptr);
   const auto __aligned = (__intptr - 1u + __align) & -__align;
   const auto __diff = __aligned - __intptr;
   if (__diff > (__space - __size))
@@ -97,7 +96,7 @@ align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept
 	{
 	  // This function is expected to be used in hot code, where
 	  // __glibcxx_assert would add unwanted overhead.
-	  _GLIBCXX_DEBUG_ASSERT((uintptr_t)__ptr % _Align == 0);
+	  _GLIBCXX_DEBUG_ASSERT((__UINTPTR_TYPE__)__ptr % _Align == 0);
 	  return static_cast<_Tp*>(__builtin_assume_aligned(__ptr, _Align));
 	}
     }
diff --git a/libstdc++-v3/include/bits/atomic_base.h b/libstdc++-v3/include/bits/atomic_base.h
index ae6819f..7c27bd8 100644
--- a/libstdc++-v3/include/bits/atomic_base.h
+++ b/libstdc++-v3/include/bits/atomic_base.h
@@ -34,7 +34,6 @@
 
 #include <bits/c++config.h>
 #include <new> // For placement new
-#include <stdint.h>
 #include <bits/atomic_lockfree_defines.h>
 #include <bits/move.h>
 
@@ -1504,7 +1503,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       explicit
       __atomic_ref(_Tp& __t) : _M_ptr(std::__addressof(__t))
-      { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); }
+      {
+	__glibcxx_assert(((__UINTPTR_TYPE__)_M_ptr % required_alignment) == 0);
+      }
 
       __atomic_ref(const __atomic_ref&) noexcept = default;
 
@@ -1615,7 +1616,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       explicit
       __atomic_ref(_Tp& __t) : _M_ptr(&__t)
-      { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); }
+      {
+	__glibcxx_assert(((__UINTPTR_TYPE__)_M_ptr % required_alignment) == 0);
+      }
 
       __atomic_ref(const __atomic_ref&) noexcept = default;
 
@@ -1788,7 +1791,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       explicit
       __atomic_ref(_Fp& __t) : _M_ptr(&__t)
-      { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); }
+      {
+	__glibcxx_assert(((__UINTPTR_TYPE__)_M_ptr % required_alignment) == 0);
+      }
 
       __atomic_ref(const __atomic_ref&) noexcept = default;
 
@@ -1915,7 +1920,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
       explicit
       __atomic_ref(_Tp*& __t) : _M_ptr(std::__addressof(__t))
-      { __glibcxx_assert(((uintptr_t)_M_ptr % required_alignment) == 0); }
+      {
+	__glibcxx_assert(((__UINTPTR_TYPE__)_M_ptr % required_alignment) == 0);
+      }
 
       __atomic_ref(const __atomic_ref&) noexcept = default;
 
diff --git a/libstdc++-v3/include/bits/atomic_wait.h b/libstdc++-v3/include/bits/atomic_wait.h
index 6c98f39..f1c183f 100644
--- a/libstdc++-v3/include/bits/atomic_wait.h
+++ b/libstdc++-v3/include/bits/atomic_wait.h
@@ -250,9 +250,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       static __waiter_pool_base&
       _S_for(const void* __addr) noexcept
       {
-	constexpr uintptr_t __ct = 16;
+	constexpr __UINTPTR_TYPE__ __ct = 16;
 	static __waiter_pool_base __w[__ct];
-	auto __key = (uintptr_t(__addr) >> 2) % __ct;
+	auto __key = ((__UINTPTR_TYPE__)__addr >> 2) % __ct;
 	return __w[__key];
       }
     };
diff --git a/libstdc++-v3/include/std/atomic b/libstdc++-v3/include/std/atomic
index 1462cf5..36ff89a 100644
--- a/libstdc++-v3/include/std/atomic
+++ b/libstdc++-v3/include/std/atomic
@@ -48,6 +48,7 @@
 #include <bits/version.h>
 
 #include <bits/atomic_base.h>
+#include <cstdint>
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {