C++: Finish gcc's include_next support

This implements the actual include_next logic and thus completes

    commit b934cc1
    C++: pass #include_next down to CppPreprocessor::tryIncludeFile

    commmit 140b502
    C++: Highlight argument to gcc's #include_next extension

Based on https://gcc.gnu.org/onlinedocs/cpp/Wrapper-Headers.html

Task-number: QTCREATORBUG-10225
Change-Id: I7eef7f5ea64a114f6d092304d32b72c55c2ce134
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

1 files changed, 24 insertions, 10 deletions

diff --git a/src/plugins/cpptools/cppsourceprocessor.cpp b/src/plugins/cpptools/cppsourceprocessor.cpp
index cd56dae3c9..a8ad8d254a 100644
--- a/src/plugins/cpptools/cppsourceprocessor.cpp
+++ b/src/plugins/cpptools/cppsourceprocessor.cpp
@@ -272,19 +272,33 @@ QString CppSourceProcessor::resolveFile_helper(const QString &fileName, IncludeT
     if (QFileInfo(fileName).isAbsolute())
         return checkFile(fileName) ? fileName : QString();
 
-    if (type == IncludeLocal && m_currentDoc) {
-        const QFileInfo currentFileInfo(m_currentDoc->fileName());
-        const QString path = cleanPath(currentFileInfo.absolutePath()) + fileName;
-        if (checkFile(path))
-            return path;
-        // Fall through! "16.2 Source file inclusion" from the standard states to continue
-        // searching as if this would be a global include.
+    auto headerPathsIt = m_headerPaths.begin();
+    auto headerPathsEnd = m_headerPaths.end();
+    if (m_currentDoc) {
+        if (type == IncludeLocal) {
+            const QFileInfo currentFileInfo(m_currentDoc->fileName());
+            const QString path = cleanPath(currentFileInfo.absolutePath()) + fileName;
+            if (checkFile(path))
+                return path;
+            // Fall through! "16.2 Source file inclusion" from the standard states to continue
+            // searching as if this would be a global include.
+
+        } else if (type == IncludeNext) {
+            const QFileInfo currentFileInfo(m_currentDoc->fileName());
+            const QString currentDirPath = cleanPath(currentFileInfo.dir().path());
+            for (; headerPathsIt != headerPathsEnd; ++headerPathsIt) {
+                if (headerPathsIt->path == currentDirPath) {
+                    ++headerPathsIt;
+                    break;
+                }
+            }
+        }
     }
 
-    foreach (const ProjectPart::HeaderPath &headerPath, m_headerPaths) {
-        if (headerPath.isFrameworkPath())
+    for (; headerPathsIt != headerPathsEnd; ++headerPathsIt) {
+        if (headerPathsIt->isFrameworkPath())
             continue;
-        const QString path = headerPath.path + fileName;
+        const QString path = headerPathsIt->path + fileName;
         if (m_workingCopy.contains(path) || checkFile(path))
             return path;
     }