Detect depfiles only when --detect_depfiles is specified

This makes generation time ~5% faster.

1 files changed, 2 insertions, 0 deletions

diff --git a/ninja.cc b/ninja.cc
index 4a5d014..6b1a778 100644
--- a/ninja.cc
+++ b/ninja.cc
@@ -474,6 +474,8 @@ class NinjaGenerator {
       node->depfile_var->Eval(ev_, depfile);
       return true;
     }
+    if (!g_flags.detect_depfiles)
+      return false;
 
     *cmd_buf += ' ';
     bool result = GetDepfileFromCommand(cmd_buf, depfile);