[Ada] New gnatbind switch -k

["Marc Poulhiès" <poulhies@adacore.com>]

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This switch can be used to disable the effect of -F when using -n
explicitly or implicitly.

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

gcc/ada/

	* bindgen.adb (Gen_Elab_Calls): Check for Check_Elaboration_Flags.
	* bindusg.adb (Display): Add -k.
	* opt.ads (Check_Elaboration_Flags): New.
	* switch-b.adb (Scan_Binder_Switches): Add processing of -k.
	* doc/gnat_ugn/building_executable_programs_with_gnat.rst: Add
	documentation for -k and -K.
	* gnat_ugn.texi: Regenerate.

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diff --git a/gcc/ada/bindgen.adb b/gcc/ada/bindgen.adb
--- a/gcc/ada/bindgen.adb
+++ b/gcc/ada/bindgen.adb
@@ -1544,6 +1544,7 @@ package body Bindgen is
 
                Check_Elab_Flag :=
                  Units.Table (Unum_Spec).Set_Elab_Entity
+                   and then Check_Elaboration_Flags
                    and then not CodePeer_Mode
                    and then (Force_Checking_Of_Elaboration_Flags
                               or Interface_Library_Unit


diff --git a/gcc/ada/bindusg.adb b/gcc/ada/bindusg.adb
--- a/gcc/ada/bindusg.adb
+++ b/gcc/ada/bindusg.adb
@@ -156,6 +156,11 @@ package body Bindusg is
         ("  -I-       Don't look for sources & library files in default "
          & "directory");
 
+      --  Line for -k switch
+
+      Write_Line
+        ("  -k        Disable checking of elaboration flags");
+
       --  Line for -K switch
 
       Write_Line


diff --git a/gcc/ada/doc/gnat_ugn/building_executable_programs_with_gnat.rst b/gcc/ada/doc/gnat_ugn/building_executable_programs_with_gnat.rst
--- a/gcc/ada/doc/gnat_ugn/building_executable_programs_with_gnat.rst
+++ b/gcc/ada/doc/gnat_ugn/building_executable_programs_with_gnat.rst
@@ -6534,6 +6534,22 @@ be presented in subsequent sections.
   ALI file named in the ``gnatbind`` command line.
 
 
+  .. index:: -k  (gnatbind)
+
+:switch:`-k`
+  Disable checking of elaboration flags. When using :switch:`-n`
+  either explicitly or implicitly, :switch:`-F` is also implied,
+  unless :switch:`-k` is used. This switch should be used with care
+  and you should ensure manually that elaboration routines are not called
+  twice unintentionally.
+
+
+  .. index:: -K  (gnatbind)
+
+:switch:`-K`
+  Give list of linker options specified for link.
+
+
   .. index:: -l  (gnatbind)
 
 :switch:`-l`


diff --git a/gcc/ada/gnat_ugn.texi b/gcc/ada/gnat_ugn.texi
--- a/gcc/ada/gnat_ugn.texi
+++ b/gcc/ada/gnat_ugn.texi
@@ -15724,6 +15724,22 @@ Do not look for sources in the current directory where @code{gnatbind} was
 invoked, and do not look for ALI files in the directory containing the
 ALI file named in the @code{gnatbind} command line.
 
+@geindex -k (gnatbind)
+
+@item @code{-k}
+
+Disable checking of elaboration flags. When using @code{-n}
+either explicitly or implicitly, @code{-F} is also implied,
+unless @code{-k} is used. This switch should be used with care
+and you should ensure manually that elaboration routines are not called
+twice unintentionally.
+
+@geindex -K (gnatbind)
+
+@item @code{-K}
+
+Give list of linker options specified for link.
+
 @geindex -l (gnatbind)
 
 @item @code{-l}
@@ -29292,8 +29308,8 @@ to permit their use in free software.
 
 @printindex ge
 
-@anchor{cf}@w{                              }
 @anchor{gnat_ugn/gnat_utility_programs switches-related-to-project-files}@w{                              }
+@anchor{cf}@w{                              }
 
 @c %**end of body
 @bye


diff --git a/gcc/ada/opt.ads b/gcc/ada/opt.ads
--- a/gcc/ada/opt.ads
+++ b/gcc/ada/opt.ads
@@ -267,6 +267,10 @@ package Opt is
    --  Set to True to detect whether subprogram parameters and function results
    --  alias the same object(s).
 
+   Check_Elaboration_Flags : Boolean := True;
+   --  GNATBIND
+   --  Set to False if switch -k is set.
+
    Check_Float_Overflow : Boolean := False;
    --  GNAT
    --  Set to True to check that operations on predefined unconstrained float


diff --git a/gcc/ada/switch-b.adb b/gcc/ada/switch-b.adb
--- a/gcc/ada/switch-b.adb
+++ b/gcc/ada/switch-b.adb
@@ -379,6 +379,12 @@ package body Switch.B is
                Bad_Switch (Switch_Chars);
             end if;
 
+         --  Processing for k switch
+
+         when 'k' =>
+            Ptr := Ptr + 1;
+            Check_Elaboration_Flags := False;
+
          --  Processing for K switch
 
          when 'K' =>