Add -d keepdepfile to preserve depfiles

This is useful when you are developing a tool which generates
GCC-style depfiles.

1 files changed, 10 insertions, 5 deletions

diff --git a/src/ninja.cc b/src/ninja.cc
index 691afad..bb76f5d 100644
--- a/src/ninja.cc
+++ b/src/ninja.cc
@@ -774,9 +774,10 @@ const Tool* ChooseTool(const string& tool_name) {
 bool DebugEnable(const string& name) {
   if (name == "list") {
     printf("debugging modes:\n"
-"  stats    print operation counts/timing info\n"
-"  explain  explain what caused a command to execute\n"
-"  keeprsp  don't delete @response files on success\n"
+"  stats        print operation counts/timing info\n"
+"  explain      explain what caused a command to execute\n"
+"  keepdepfile  don't delete depfiles after they're read by ninja\n"
+"  keeprsp      don't delete @response files on success\n"
 #ifdef _WIN32
 "  nostatcache  don't batch stat() calls per directory and cache them\n"
 #endif
@@ -788,6 +789,9 @@ bool DebugEnable(const string& name) {
   } else if (name == "explain") {
     g_explaining = true;
     return true;
+  } else if (name == "keepdepfile") {
+    g_keep_depfile = true;
+    return true;
   } else if (name == "keeprsp") {
     g_keep_rsp = true;
     return true;
@@ -796,8 +800,9 @@ bool DebugEnable(const string& name) {
     return true;
   } else {
     const char* suggestion =
-        SpellcheckString(name.c_str(), "stats", "explain", "keeprsp",
-        "nostatcache", NULL);
+        SpellcheckString(name.c_str(),
+                         "stats", "explain", "keepdepfile", "keeprsp",
+                         "nostatcache", NULL);
     if (suggestion) {
       Error("unknown debug setting '%s', did you mean '%s'?",
             name.c_str(), suggestion);