Why Does My Eclipse Project Compile Successfully But Still Show Semantic Errors?

Eclipse Compiles Successfully but Exhibits Semantic Errors

Eclipse Juno ADT users may encounter an issue where code compiles successfully, but Eclipse reports semantic errors, affecting symbols from libraries like OpenCV4Android.

Cause:
The problem arises from a disrupted CDT index after updating the Android NDK and modifying include paths.

Symptoms:

• No errors appear until opening a C file in the jni folder.
• Build operations are successful, but running the application after opening a C file results in "Field '' could not be resolved" errors.
• Semantic errors primarily occur on symbols like "line," "queryIdx," and "trainIdx" from OpenCV4Android.

Possible Solution:
In the selected project preferences within Eclipse:

1. Go to C/C General -> Code Analysis -> Launching.
2. Uncheck both "Enable Code Analysis Tools on Every Build" and "Enable C/C Syntax Validation and Semantic Analysis."
3. Close and reopen the project or restart Eclipse.
4. Rebuild the project.

Explanation:
Disabling these options prevents Eclipse from performing excessive code analysis checks, which can interfere with the indexing process and lead to false semantic errors.

Additional Observations:

• The issue appears to be isolated to the CDT index, as command-line builds using ndk-build succeed.
• Removing and re-adding OpenCV4Android includes in the Paths and Symbols section may not resolve the problem.
• Splitting up lines with unresolved symbols into multiple statements as a temporary workaround.

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