From 6324239cf260f82312143a83855eb53bdc890a70 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 24 Nov 2017 17:52:07 +0200
Subject: Improve diagnostics

---
 build2/cc/gcc.cxx | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

(limited to 'build2/cc/gcc.cxx')

diff --git a/build2/cc/gcc.cxx b/build2/cc/gcc.cxx
index bcf2a89..ce1450e 100644
--- a/build2/cc/gcc.cxx
+++ b/build2/cc/gcc.cxx
@@ -120,7 +120,16 @@ namespace build2
           is.close (); // Don't block.
 
           if (!pr.wait ())
-            throw failed ();
+          {
+            // We have read stderr so better print some diagnostics.
+            //
+            diag_record dr (fail);
+
+            dr << "failed to extract " << x_lang << " header search paths" <<
+              info << "command line: ";
+
+            print_process (dr, args);
+          }
         }
         catch (const io_error&)
         {
@@ -203,7 +212,7 @@ namespace build2
           is.close (); // Don't block.
 
           if (!pr.wait ())
-            throw failed ();
+            throw failed (); // Assume issued diagnostics to stderr.
         }
         catch (const io_error&)
         {
-- 
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