From 0bf810937f9340c19d1a085eed04d4a209c17d23 Mon Sep 17 00:00:00 2001
From: Samuli Piippo <samuli.piippo@qt.io>
Date: Thu, 30 Mar 2017 11:37:24 +0300
Subject: [PATCH] chromium: workaround for too long .rps file name

Ninja may fail when the build directory is too long:

ninja: error: WriteFile(__third_party_WebKit_Source_bindings_modules_\
interfaces_info_individual_modules__home_qt_work_build_build-nitrogen\
6x_tmp_work_cortexa9hf-neon-mx6qdl-poky-linux-gnueabi_qtwebengine_5.9\
.0_gitAUTOINC_29afdb0a34_049134677a-r0_build_src_toolchain_target__ru\
le.rsp): Unable to create file. File name too long

Task-number: QTBUG-59769
Change-Id: I73c5e64ae5174412be2a675e35b0b6047f2bf4c1
---
 gn/tools/gn/ninja_action_target_writer.cc | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/gn/tools/gn/ninja_action_target_writer.cc b/gn/tools/gn/ninja_action_target_writer.cc
index 7e945c0de0e..3deb587668c 100644
--- a/gn/tools/gn/ninja_action_target_writer.cc
+++ b/gn/tools/gn/ninja_action_target_writer.cc
@@ -118,9 +118,18 @@ std::string NinjaActionTargetWriter::WriteRuleDefinition() {
     // strictly necessary for regular one-shot actions, but it's easier to
     // just always define unique_name.
     std::string rspfile = custom_rule_name;
+
+    //quick workaround if filename length > 255 - ".rsp", just cut the dirs starting from the end
+    //please note ".$unique_name" is not used at the moment
+    int pos = 0;
+    std::string delimiter("_");
+    while (rspfile.length() > 250 && (pos = rspfile.find_last_of(delimiter)) != std::string::npos)
+        rspfile = rspfile.substr(0,pos);
+
     if (!target_->sources().empty())
       rspfile += ".$unique_name";
     rspfile += ".rsp";
+
     out_ << "  rspfile = " << rspfile << std::endl;
 
     // Response file contents.
