libstdc++: Add wrapper for internal uses of std::terminate

  This adds an inline wrapper for std::terminate that doesn't add the
declaration of std::terminate to namespace std. This allows the
library to terminate without including all of <exception>.

libstdc++-v3/ChangeLog:

	* include/bits/atomic_timed_wait.h: Remove unused header.
	* include/bits/c++config (std:__terminate): Define.
	* include/bits/semaphore_base.h: Remove <exception> and use
	__terminate instead of terminate.
	* include/bits/std_thread.h: Likewise.
	* libsupc++/eh_terminate.cc (std::terminate): Use qualified-id
	to call __cxxabiv1::__terminate.


This avoids including a few thousand lines of <exception> just for one
function declaration. Any objections or better ideas?
commit 79cd06f3072fd8a68b8636f7d11bb42e62eaa6fa
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Oct 8 11:35:53 2021

    libstdc++: Add wrapper for internal uses of std::terminate
    
    This adds an inline wrapper for std::terminate that doesn't add the
    declaration of std::terminate to namespace std. This allows the
    library to terminate without including all of <exception>.
    
    libstdc++-v3/ChangeLog:
    
            * include/bits/atomic_timed_wait.h: Remove unused header.
            * include/bits/c++config (std:__terminate): Define.
            * include/bits/semaphore_base.h: Remove <exception> and use
            __terminate instead of terminate.
            * include/bits/std_thread.h: Likewise.
            * libsupc++/eh_terminate.cc (std::terminate): Use qualified-id
            to call __cxxabiv1::__terminate.
  

On 08/10/21 12:23 +0100, Jonathan Wakely wrote:
>This adds an inline wrapper for std::terminate that doesn't add the
>declaration of std::terminate to namespace std. This allows the
>library to terminate without including all of <exception>.
>
>libstdc++-v3/ChangeLog:
>
>	* include/bits/atomic_timed_wait.h: Remove unused header.
>	* include/bits/c++config (std:__terminate): Define.
>	* include/bits/semaphore_base.h: Remove <exception> and use
>	__terminate instead of terminate.
>	* include/bits/std_thread.h: Likewise.
>	* libsupc++/eh_terminate.cc (std::terminate): Use qualified-id
>	to call __cxxabiv1::__terminate.
>
>
>This avoids including a few thousand lines of <exception> just for one
>function declaration. Any objections or better ideas?

I've pushed this to trunk now.


>commit 79cd06f3072fd8a68b8636f7d11bb42e62eaa6fa
>Author: Jonathan Wakely <jwakely@redhat.com>
>Date:   Fri Oct 8 11:35:53 2021
>
>    libstdc++: Add wrapper for internal uses of std::terminate
>
>    This adds an inline wrapper for std::terminate that doesn't add the
>    declaration of std::terminate to namespace std. This allows the
>    library to terminate without including all of <exception>.
>
>    libstdc++-v3/ChangeLog:
>
>            * include/bits/atomic_timed_wait.h: Remove unused header.
>            * include/bits/c++config (std:__terminate): Define.
>            * include/bits/semaphore_base.h: Remove <exception> and use
>            __terminate instead of terminate.
>            * include/bits/std_thread.h: Likewise.
>            * libsupc++/eh_terminate.cc (std::terminate): Use qualified-id
>            to call __cxxabiv1::__terminate.
>
>diff --git a/libstdc++-v3/include/bits/atomic_timed_wait.h b/libstdc++-v3/include/bits/atomic_timed_wait.h
>index 64c1ba62a3e..efbe3da8b6c 100644
>--- a/libstdc++-v3/include/bits/atomic_timed_wait.h
>+++ b/libstdc++-v3/include/bits/atomic_timed_wait.h
>@@ -40,7 +40,6 @@
> #include <bits/chrono.h>
>
> #ifdef _GLIBCXX_HAVE_LINUX_FUTEX
>-#include <exception> // std::terminate
> #include <sys/time.h>
> #endif
>
>diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
>index 69343a25533..b76ffeb2562 100644
>--- a/libstdc++-v3/include/bits/c++config
>+++ b/libstdc++-v3/include/bits/c++config
>@@ -293,6 +293,15 @@ namespace std
> #if __cplusplus >= 201103L
>   typedef decltype(nullptr)	nullptr_t;
> #endif
>+
>+  // This allows the library to terminate without including all of <exception>
>+  // and without making the declaration of std::terminate visible to users.
>+  __attribute__ ((__noreturn__, __always_inline__))
>+  inline void __terminate() _GLIBCXX_USE_NOEXCEPT
>+  {
>+    void terminate() _GLIBCXX_USE_NOEXCEPT __attribute__ ((__noreturn__));
>+    terminate();
>+  }
> }
>
> #define _GLIBCXX_USE_DUAL_ABI
>diff --git a/libstdc++-v3/include/bits/semaphore_base.h b/libstdc++-v3/include/bits/semaphore_base.h
>index 2c8d7576894..afd636704e8 100644
>--- a/libstdc++-v3/include/bits/semaphore_base.h
>+++ b/libstdc++-v3/include/bits/semaphore_base.h
>@@ -40,7 +40,6 @@
> #endif // __cpp_lib_atomic_wait
>
> #ifdef _GLIBCXX_HAVE_POSIX_SEMAPHORE
>-# include <exception>	// std::terminate
> # include <cerrno>	// errno, EINTR, EAGAIN etc.
> # include <limits.h>	// SEM_VALUE_MAX
> # include <semaphore.h>	// sem_t, sem_init, sem_wait, sem_post etc.
>@@ -80,7 +79,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> 	  if (__err && (errno == EINTR))
> 	    continue;
> 	  else if (__err)
>-	    std::terminate();
>+	    std::__terminate();
> 	  else
> 	    break;
> 	}
>@@ -97,7 +96,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> 	  else if (__err && (errno == EAGAIN))
> 	    return false;
> 	  else if (__err)
>-	    std::terminate();
>+	    std::__terminate();
> 	  else
> 	    break;
> 	}
>@@ -111,7 +110,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> 	{
> 	   auto __err = sem_post(&_M_semaphore);
> 	   if (__err)
>-	     std::terminate();
>+	     std::__terminate();
> 	}
>     }
>
>@@ -138,7 +137,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> 	      else if (errno == ETIMEDOUT || errno == EINVAL)
> 		return false;
> 	      else
>-		std::terminate();
>+		std::__terminate();
> 	    }
> 	  else
> 	    break;
>diff --git a/libstdc++-v3/include/bits/std_thread.h b/libstdc++-v3/include/bits/std_thread.h
>index 2a500bf1777..801033b00ad 100644
>--- a/libstdc++-v3/include/bits/std_thread.h
>+++ b/libstdc++-v3/include/bits/std_thread.h
>@@ -35,7 +35,6 @@
> #if __cplusplus >= 201103L
> #include <bits/c++config.h>
>
>-#include <exception>		// std::terminate
> #include <iosfwd>		// std::basic_ostream
> #include <tuple>		// std::tuple
> #include <bits/functional_hash.h> // std::hash
>@@ -149,7 +148,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>     ~thread()
>     {
>       if (joinable())
>-	std::terminate();
>+	std::__terminate();
>     }
>
>     thread(const thread&) = delete;
>@@ -162,7 +161,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
>     thread& operator=(thread&& __t) noexcept
>     {
>       if (joinable())
>-	std::terminate();
>+	std::__terminate();
>       swap(__t);
>       return *this;
>     }
>diff --git a/libstdc++-v3/libsupc++/eh_terminate.cc b/libstdc++-v3/libsupc++/eh_terminate.cc
>index db6735f308e..a94f173bb2e 100644
>--- a/libstdc++-v3/libsupc++/eh_terminate.cc
>+++ b/libstdc++-v3/libsupc++/eh_terminate.cc
>@@ -55,7 +55,7 @@ __cxxabiv1::__terminate (std::terminate_handler handler) throw ()
> void
> std::terminate () throw()
> {
>-  __terminate (get_terminate ());
>+  __cxxabiv1::__terminate (get_terminate ());
> }
>
> #pragma GCC diagnostic ignored "-Wdeprecated-declarations"