[gcc r12-4160] [Ada] Note that -gnatd_t is used in CCG

[gcc r12-4160] [Ada] Note that -gnatd_t is used in CCG

[Pierre-Marie de Rodat]

https://gcc.gnu.org/g:e035b4f5924b5fa5d32cb91f476221ab6edef0bb

commit r12-4160-ge035b4f5924b5fa5d32cb91f476221ab6edef0bb
Author: Richard Kenner <kenner@adacore.com>
Date:   Tue Sep 14 08:28:09 2021 -0400

    [Ada] Note that -gnatd_t is used in CCG
    
    gcc/ada/
    
            * debug.adb: Add documentation for -gnatd_t.

Diff:
---
 gcc/ada/debug.adb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gcc/ada/debug.adb b/gcc/ada/debug.adb
index 7b2b147c6f7..88730006f7b 100644
--- a/gcc/ada/debug.adb
+++ b/gcc/ada/debug.adb
@@ -158,7 +158,7 @@ package body Debug is
    --  d_q
    --  d_r
    --  d_s  Stop elaboration checks on synchronous suspension
-   --  d_t
+   --  d_t  In LLVM-based CCG, dump LLVM IR after transformations are done
    --  d_u
    --  d_v  Enable additional checks and debug printouts in Atree
    --  d_w
@@ -997,6 +997,10 @@ package body Debug is
    --       a call to routine Ada.Synchronous_Task_Control.Suspend_Until_True
    --       or Ada.Synchronous_Barriers.Wait_For_Release.
 
+   --  d_t  In the LLVM-based CCG, do an additional dump of the LLVM IR
+   --       after the pass that does transformations to the IR into a
+   --       filename ending with .trans.ll.
+
    --  d_v  Enable additional checks and debug printouts in Atree
 
    --  d_x  The compiler does not expand in line the Image attribute for user-