[Ada] Annotate GNAT.Sockets with No_Return aspects

[Ada] Annotate GNAT.Sockets with No_Return aspects

[Pierre-Marie de Rodat]

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Opportunity for extra annotations spotted while fixing detection of
unreachable code that follows calls to procedures annotated with
No_Return.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* libgnat/g-socket.adb (Raise_Host_Error): Add No_Return aspect.
	(Raise_GAI_Error): Likewise.
	* libgnat/g-socket.ads (Raise_Socket_Error): Likewise.

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diff --git a/gcc/ada/libgnat/g-socket.adb b/gcc/ada/libgnat/g-socket.adb
--- a/gcc/ada/libgnat/g-socket.adb
+++ b/gcc/ada/libgnat/g-socket.adb
@@ -191,12 +191,14 @@ package body GNAT.Sockets is
        else Value);
    --  Removes dot at the end of error message
 
-   procedure Raise_Host_Error (H_Error : Integer; Name : String);
+   procedure Raise_Host_Error (H_Error : Integer; Name : String)
+   with No_Return;
    --  Raise Host_Error exception with message describing error code (note
    --  hstrerror seems to be obsolete) from h_errno. Name is the name
    --  or address that was being looked up.
 
-   procedure Raise_GAI_Error (RC : C.int; Name : String);
+   procedure Raise_GAI_Error (RC : C.int; Name : String)
+   with No_Return;
    --  Raise Host_Error with exception message in case of errors in
    --  getaddrinfo and getnameinfo.
 


diff --git a/gcc/ada/libgnat/g-socket.ads b/gcc/ada/libgnat/g-socket.ads
--- a/gcc/ada/libgnat/g-socket.ads
+++ b/gcc/ada/libgnat/g-socket.ads
@@ -1593,7 +1593,7 @@ private
    Wait_For_A_Full_Reception : constant Request_Flag_Type := 4;
    Send_End_Of_Record        : constant Request_Flag_Type := 8;
 
-   procedure Raise_Socket_Error (Error : Integer);
+   procedure Raise_Socket_Error (Error : Integer) with No_Return;
    --  Raise Socket_Error with an exception message describing the error code
    --  from errno.