[gcc r16-6932] diagnostics: Print invocation on ICE

[Nathan Sidwell]

https://gcc.gnu.org/g:358ab6c5ab4d70967ba83a8b5fc426c34d628316

commit r16-6932-g358ab6c5ab4d70967ba83a8b5fc426c34d628316
Author: Nathan Sidwell <nathan@acm.org>
Date:   Sat Nov 1 20:02:47 2025 -0400

    diagnostics: Print invocation on ICE
    
    Print the compiler's invocation upon ICE. Particularly useful on LTO
    crashes.
    
            gcc/
            * diagnostics/context.cc (context::action_after_output): Print
            invocation on ICE.

Diff:
---
 gcc/diagnostics/context.cc | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/gcc/diagnostics/context.cc b/gcc/diagnostics/context.cc
index 9cb13acc5203..03d570665843 100644
--- a/gcc/diagnostics/context.cc
+++ b/gcc/diagnostics/context.cc
@@ -1003,10 +1003,11 @@ context::action_after_output (enum kind diag_kind)
 	/* Attempt to ensure that any outputs are flushed e.g. that .sarif
 	   files are written out.
 	   Only do it once.  */
-	static bool finishing_due_to_ice = false;
-	if (!finishing_due_to_ice)
+	static char **saved_argv = nullptr;
+	if (!saved_argv)
 	  {
-	    finishing_due_to_ice = true;
+	    saved_argv = m_original_argv;
+	    m_original_argv = nullptr;
 	    finish ();
 	  }
 
@@ -1021,6 +1022,12 @@ context::action_after_output (enum kind diag_kind)
 	if (m_abort_on_error)
 	  real_abort ();
 
+	bool space = false;
+	for (auto *argv = saved_argv; *argv; space = true)
+	  fnotice (stderr, &" %s"[1 - space], *argv++);
+	fnotice (stderr, "\n");
+	freeargv (saved_argv);
+
 	if (m_report_bug)
 	  fnotice (stderr, "Please submit a full bug report, "
 		   "with preprocessed source.\n");