[Ada] Remove ASIS tree generation

2020-06-03  Arnaud Charlet  <charlet@adacore.com>

gcc/ada/

	* aspects.adb, aspects.ads, atree.adb, atree.ads, elists.adb,
	elists.ads, fname.adb, fname.ads, gnat1drv.adb, lib.adb,
	lib.ads, namet.adb, namet.ads, nlists.adb, nlists.ads, opt.adb,
	opt.ads, osint-c.adb, osint-c.ads, repinfo.adb, repinfo.ads,
	sem_aux.adb, sem_aux.ads, sinput.adb, sinput.ads, stand.ads,
	stringt.adb, stringt.ads, switch-c.adb, table.adb, table.ads,
	uintp.adb, uintp.ads, urealp.adb, urealp.ads (Tree_Read,
	Tree_Write): Remove generation of ASIS trees.
	* doc/gnat_ugn/building_executable_programs_with_gnat.rst:
	Remove -gnatt and -gnatct documentation.
	* gnat_ugn.texi: Regenerate.
	* tree_in.ads, tree_in.adb, tree_io.ads, tree_io.adb,
	tree_gen.ads, tree_gen.adb, stand.adb: Remove.
	* gcc-interface/Makefile.in, gcc-interface/Make-lang.in: Remove
	references to tree_gen.o tree_in.o tree_io.o.

1 files changed, 6 insertions, 24 deletions

diff --git a/gcc/ada/opt.ads b/gcc/ada/opt.ads
index d60380d..ebd5a78 100644
--- a/gcc/ada/opt.ads
+++ b/gcc/ada/opt.ads
@@ -242,9 +242,9 @@ package Opt is
    --  GNAT
    --  If set True, enables back annotation of representation information
    --  by gigi, even in -gnatc mode. This is set True by the use of -gnatR
-   --  (list representation information) or -gnatt (generate tree). It is
-   --  also set true if certain Unchecked_Conversion instantiations require
-   --  checking based on annotated values.
+   --  (list representation information). It is also set true if certain
+   --  Unchecked_Conversion instantiations require checking based on annotated
+   --  values.
 
    Back_End_Handles_Limited_Types : Boolean;
    --  This flag is set true if the back end can properly handle limited or
@@ -704,10 +704,10 @@ package Opt is
    --  Indicates the current setting of Fast_Math mode, as set by the use
    --  of a Fast_Math pragma (set True by Fast_Math (On)).
 
-   Force_ALI_Tree_File : Boolean := False;
+   Force_ALI_File : Boolean := False;
    --  GNAT
-   --  Force generation of ALI file even if errors are encountered. Also forces
-   --  generation of tree file if -gnatt is also set. Set on by use of -gnatQ.
+   --  Force generation of ALI file even if errors are encountered.
+   --  Set on by use of -gnatQ.
 
    Disable_ALI_File : Boolean := False;
    --  GNAT
@@ -1644,10 +1644,6 @@ package Opt is
    --  Set True to treat pragma Restrictions as Restriction_Warnings. Set by
    --  -gnatr switch.
 
-   Tree_Output : Boolean := False;
-   --  GNAT
-   --  Set to True (-gnatt) to generate output tree file
-
    Try_Semantics : Boolean := False;
    --  GNAT
    --  Flag set to force attempt at semantic analysis, even if parser errors
@@ -2232,20 +2228,6 @@ package Opt is
    --  be in the spec of Expander, but it is referenced by Errout, and it
    --  really seems wrong for Errout to depend on Expander.
 
-   -----------------------
-   -- Tree I/O Routines --
-   -----------------------
-
-   procedure Tree_Read;
-   --  Reads switch settings from current tree file using Tree_Read
-
-   procedure Tree_Write;
-   --  Writes out switch settings to current tree file using Tree_Write
-
-   Tree_Version_String : String_Access;
-   --  Used to store the compiler version string read from a tree file to check
-   --  if it is from the same date as stored in the version string in Gnatvsn.
-
    -----------------------------------
    -- Modes for Formal Verification --
    -----------------------------------