From aeb1b0c9dfba7a3abc47dca709b639c6cdcaa459 Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@qt.io>
Date: Mon, 22 Apr 2019 21:25:16 +0200
Subject: WIP

Change-Id: I239f7f82780db7754a62bb20c2d377c844b187fe
---
 qmake/generators/makefile.cpp | 58 +++++++++++++++++++++++++++++++++++++------
 qmake/generators/makefile.h   |  2 ++
 2 files changed, 53 insertions(+), 7 deletions(-)

diff --git a/qmake/generators/makefile.cpp b/qmake/generators/makefile.cpp
index 2918a2ee58..5633955372 100644
--- a/qmake/generators/makefile.cpp
+++ b/qmake/generators/makefile.cpp
@@ -1107,13 +1107,7 @@ MakefileGenerator::write()
 
         if (compileCommands) {
             QFileInfo outputMakeFileInfo(fileInfo(Option::output.fileName()));
-            QString compileCommandsFileName = "compile_commands";
-            QString infix = outputMakeFileInfo.completeSuffix();
-            if (!infix.isEmpty()) {
-                compileCommandsFileName += '_';
-                compileCommandsFileName += infix;
-            }
-            compileCommandsFileName += ".json";
+            QString compileCommandsFileName = CompileCommandRecorder::compilationDatabaseFileNameForMakefile(outputMakeFileInfo);
             QFile f(compileCommandsFileName);
             if (f.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
                 f.write(QJsonDocument(compileCommands->commands).toJson());
@@ -2719,6 +2713,44 @@ MakefileGenerator::writeSubTargets(QTextStream &t, QList<MakefileGenerator::SubT
         }
     }
 
+    if (project->isActiveConfig("create_compile_commands") && !targets.isEmpty()) {
+#if 1
+        QString commands;
+        commands += "sed";
+        for (QList<SubTarget*>::Iterator it = targets.begin(); it != targets.end(); ++it) {
+            if ((*it)->profile.isEmpty())
+                continue;
+            auto subtarget = *it;
+            QString out_directory = subtarget->out_directory;
+            if(!out_directory.isEmpty() && !out_directory.endsWith(Option::dir_sep))
+                out_directory += Option::dir_sep;
+            commands += " " + out_directory + CompileCommandRecorder::compilationDatabaseFileNameForMakefile(fileInfo(subtarget->makefile));
+            project->values("create_compile_commands.recurse") += subtarget->name;
+        }
+
+        project->values("create_compile_commands.commands") += commands;
+        project->values("create_compile_commands.CONFIG") += "recursive";
+        project->values("create_compile_commands.recurse_target") += "create_compile_commands";
+        project->values("QMAKE_EXTRA_TARGETS") += "create_compile_commands";
+#else
+        t << "\ncreate_compile_commands:";
+        if(!targets.isEmpty()) {
+            t << "\n\tsed";
+            for (QList<SubTarget*>::Iterator it = targets.begin(); it != targets.end(); ++it) {
+                if ((*it)->profile.isEmpty())
+                    continue;
+                auto subtarget = *it;
+                QString out_directory = subtarget->out_directory;
+                if(!out_directory.isEmpty() && !out_directory.endsWith(Option::dir_sep))
+                    out_directory += Option::dir_sep;
+                    t << " " << out_directory + CompileCommandRecorder::compilationDatabaseFileNameForMakefile(fileInfo(subtarget->makefile));
+            }
+            t << " > compile_commands.json";
+        }
+        t << "\n";
+#endif
+    }
+
     // user defined targets
     const ProStringList &qut = project->values("QMAKE_EXTRA_TARGETS");
     for (ProStringList::ConstIterator qut_it = qut.begin(); qut_it != qut.end(); ++qut_it) {
@@ -3502,4 +3534,16 @@ QString MakefileGenerator::shellQuote(const QString &str)
     return isWindowsShell() ? IoUtils::shellQuoteWin(str) : IoUtils::shellQuoteUnix(str);
 }
 
+QString CompileCommandRecorder::compilationDatabaseFileNameForMakefile(const QFileInfo &makeFileInfo)
+{
+    QString compileCommandsFileName = "compile_commands";
+    QString infix = makeFileInfo.completeSuffix();
+    if (!infix.isEmpty()) {
+        compileCommandsFileName += '_';
+        compileCommandsFileName += infix;
+    }
+    compileCommandsFileName += ".json";
+    return compileCommandsFileName;
+}
+
 QT_END_NAMESPACE
diff --git a/qmake/generators/makefile.h b/qmake/generators/makefile.h
index f81fc3cb54..9cc1550fb5 100644
--- a/qmake/generators/makefile.h
+++ b/qmake/generators/makefile.h
@@ -40,6 +40,7 @@
 
 QT_BEGIN_NAMESPACE
 
+// ### rename to compilation database
 struct CompileCommandRecorder
 {
     QJsonArray commands;
@@ -47,6 +48,7 @@ struct CompileCommandRecorder
     // values are coded in the makefile and also supplied here, for expansion before writing
     // compile_commands.json.
     QHash<QString, QString> compilerVariables;
+    static QString compilationDatabaseFileNameForMakefile(const QFileInfo &makeFileInfo);
 };
 
 #ifdef Q_OS_WIN32
-- 
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