Issue
After a recent upgrade (only SSD capacity change), Eclipse CDT Indexer has been giving me a tough time. My project folder structure is as shown below.
LinEmLibrary
└─ test
├─ TestNumParam.cpp
├─ TestNumParam.h
├─ TestPMS.cpp
├─ TestPMS.h
├─ TestSerial.cpp
├─ TestSerial.h
├─ TestWindow.cpp
└─ TestWindow.h
TestWindow.h has the class implementing the top level window and the other three are instantiated by the class CTestWindow.
After the upgrade (until which things were running perfectly), Codan (code analysis) started highlighting the declarations of all of my class instances (CTestNUmParam, CTestPMS and CTestSerial) in red saying Type X could not be resolved. However I am able to perform code completion (CTRL+SPACE) and resolve all members of the class though it takes a painfully long amount of time. The code builds and executes properly.
I have tried
- rebuilding the index
- Increased the Indexer cache limits (Window > Preferences > C/C++ > Indexer - Cache limits) to,
- Limit relative to the maximum heap size: 75%
- Absolute limit: 1024 MB
- Set the initial and maximum heap size in
eclipse.inito- Xms2048m
- Xmx4096m
- adding absolute path to this folder in the Project Settings > C/C++ General > Paths and Symbols and even include my header using <> instead of ""
- create a new project and manually copy the files to the new project
- export the project and open in another computer having same build tools
But in all cases the result is the same.
When I create a parse log for TestWIndow.h (right click on the header file in project explorer, Index > Create Parser Log File) I get the following output (first ~12,000 lines removed).
Unresolved includes (from headers in index):
file:/home/mohith/eclipse_workspace/LinEmLibrary/test/TestNumParam.h is not indexed
file:/home/mohith/eclipse_workspace/LinEmLibrary/test/TestPMS.h is not indexed
file:/home/mohith/eclipse_workspace/LinEmLibrary/test/TestSerial.h is not indexed
Unresolved names:
Attempt to use symbol failed: CTestNumParam in file /home/mohith/eclipse_workspace/LinEmLibrary/test/TestWindow.h:76
Attempt to use symbol failed: CTestPMS in file /home/mohith/eclipse_workspace/LinEmLibrary/test/TestWindow.h:77
Attempt to use symbol failed: CTestSerial in file /home/mohith/eclipse_workspace/LinEmLibrary/test/TestWindow.h:78
A template id provides illegal arguments for the instantiation: map in file /home/mohith/eclipse_workspace/LinEmLibrary/test/TestWindow.h:80
Attempt to use symbol failed: EGridType in file /home/mohith/eclipse_workspace/LinEmLibrary/test/TestWindow.h:80
The reason for the semantic highlighting is now understood from this but why the indexer is not including my own header files leaves me clueless.
Would be a great help if someone can shed some light.
My system information
Eclipse
Version: 2021-09 (4.21.0)
Build id: 20210910-1417
CDT: 10.4.0.202109080104
OS Ubuntu 20.04 x86-64
RAM: 16 GiB
CPU: Intel® Core™ i5-8265U CPU @ 1.60GHz
Solution
After a month of struggle I have finally broght things back to normal.
The issue appears to be the preferences I would import after creating a new workspace. I have exported preferences once after setting up the environment for code style, editor font / color etc. I don't remember exactly but I might have created it while running Eclipse 2021-03.
This time I created a new workspace and added the project from SVN without importing preferences and viola... all my headers are indexed! Later I individually exported the code style and other templates and brought it into my new workspace without any issues.
I was also facing issue with Log4CPlus where all its macros were marked as 'symbol not resolved'. Upon inspecting the parser log file I saw that the symbol __cplusplus was set to 201402 even though I had selected c++20 as the dialect in build settings. Then I added the symbol __cplusplus manully in Project Settings > C/C++ General > Paths and Symbols > Symbols > GNU C++ while settings it to 202002. That fixed the issue with Log4CPlus as well.
Answered By - Mohith