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This document contains the known issues
that were discovered before and since the release of
LabVIEW 2010 C Generator. Not every issue known to NI will appear on this
list; it is intended to only show the severe and more common issues
that can be encountered.
Each Issue appears as a row in the table and
includes these fields:
- Issue ID
- Legacy ID - The issue's legacy ID from NI's deprecated bug reporting database (if applicable)
- Issue Title
- Problem Description
- Workaround
- Reported Version - the earliest version of LabVIEW the issue was reported in
- Resolved Version - version the issue was resolved or was no longer applicable
- Date Added - the date the issue was added to the document
(not reported date)
Document Organization
The Known Issues Document displays the issues by issue category.Known Issues by Category
Please refer to Developer Zone Article " LabVIEW Known Issues Categories Defined" for an explanation of the categories and what types of issues are in each category.
Contacting NI
You can contact us by phone, email, or the discussion forums. Visit the NI Website to contact us. If you are contacting NI in regards to a specific issue, be sure to reference the ID number given in this document. If you have feedback on this specific document, please contact NI on this NI Developer Zone post.
Known Issues by Category
The following items are known issues in LabVIEW 2010 C Generator Known Issues sorted by Category.
| ID | Known Issue | |||||
|---|---|---|---|---|---|---|
| Building and Distributing LabVIEW Applications | ||||||
| 214201 Return |
LabVIEW datatype definitions can conflict with those in external C code LabVIEW defines certain basic datatypes in the generated C code, viz. Boolean, float32, float64. When integrating the LabVIEW generated C code in a larger C application/code base, you should take precautions to avoid datatype definition conflicts. For eg, if the external code base also defines a 32-bit float as "float32", you will get a compiler error. Workaround: There are multiple ways of avoiding type name conflicts: 1. You can use LabVIEW generated datatypes in your top-level C application. These types are defined in LVDefs_plat.h. This file can be found in labview\CCodeGen\inlcude\os, under the directory for your specific operating system. 2. You can redefined your datatypes with names that are different from those used in the LabVIEW generated C code.
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| 223962 Return |
Leading or trailing white spaces in the Build Specification name might cause C generation to fail When using the LVCG.exe to generate C code from the command line, leading or trailing white spaces in the the Build Specification name might cause the C generation process to fail. LVCG.exe takes the Build Specification name as one of its input parameters and it cannot process leading or trailing white spaces. Workaround: N/A
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| 224349 Return |
Libraries built from LabVIEW generated C code might not link if they use complex data types LabVIEW generated complex data types, viz. cmplx64 and cmplx128 are defined in LVDefs.h. However, LV Defs.h is not included in the LabVIEW generated header for your exported VI. If your exported function uses the complex datatypes as parameters, your library will fail to link against calling C code. Workaround: Include LVDefs.h manually into your external application. It can be found at labview\CCodeGen\include\blockdiagram. Alternatively, you can add LVCGenIncludes.h into all your top level C files, this will include all necessary runtime support.
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| 233935 Return |
Some unsupported Express VIs do not report a warning when used in an exported VI When a top level VI is configured for export by adding it to a C Generator Build Specification, LabVIEW performs syntax checking on it to warn the user if unsupported VIs are used on the Block Diagram. However, the following VIs do not cause a warning: Group Digital Signals Set Dynamic Data Attributes Get Dynamic Data Attributes Spectral Measurements Report These VIs will cause the C Generation/Build step to fail. Workaround: N/A
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| 222781 Return |
VIs added to the Always Included list in the Build Specification are not checked for syntax You can check the syntax of your exported VI by right-clicking on your C Generator Build Specification and selecting "Check Syntax...". Doing this only checks the exported VI for syntax, VIs added to the Always Included list on the Source Files page of the Build Specification are not checked. If the VIs in the Always Included list contain unsupported elements, the C generating step will fail. Workaround: N/A
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| 228110 Return |
LabVIEW generated Makefile compiles all object (.obj) files when creating a DLL The LabVIEW generated Makefile compiles all object files present in the obj directory. If this directory contains object files for VIs that have been removed from your VI hierarchy, they might cause a linker error. Workaround: You can manually delete the obj directory to ensure that all old object files are deleted. Running the make command after this will regenerate the obj directory and all necessary object files.
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| 231443 Return |
LabVIEW does not check Entry/Exit action VIs for syntax when using the Statechart Module Statechart module lets you configure Entry and Exit actions for each state. LabVIEW does not check the VIs used in these actions for syntax. If you use unsupported VIs in the Entry/Exit actions, C generation might fail. Workaround: N/A
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| 231779 Return |
Control References and Property Nodes do not report a warning when used in an exported VI When a top level VI is configured for export by adding it to a C Generator Build Specification, LabVIEW performs syntax checking on it to warn the user if unsupported VIs are used on the Block Diagram. However, Control References and Property Nodes do not report a warning. While the C generation step may succeed, using the generated code in an application will cause compilation errors. Workaround: N/A
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| 235810 Return |
Contents of Virtual Folders that are added to the Always Included list might be ignored If a Virtual Folder is added to the Always Included list on the Source Files page of the Build Specification, the VIs contained in it might be ignored by the C Generation process. Workaround: Add VIs directly to the Always Included list.
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| 239217 Return |
C generation might fail if a Statechart is added to the Always Included list in the Build Specification C generation might fail if a Statechart (.lvsc) is added to the Always Included list in the Source Files page of the Build Specification. Workaround: N/A
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| 240267 Return |
Password protected VIs in the exported VI hierarchy will cause C generation to fail Having a password protected VI in the exported VI hierarchy will cause the C generation to fail. Workaround: You have to manually find and open the Block Diagram of the password protected VI(s). You will need to enter the password to do this. Once the VI(s) is unlocked, C generation will succeed.
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| Compatibility | ||||||
| 231444 Return |
C Code Generation might fail is unsupported VIs are added to Entry and Exit actions in a Statechart The Statechart Module lets you configure Entry and Exit actions for every state by adding LabVIEW VIs in an editor. LabVIEW does not warn you if unsupported functions are added to the editor. C Code generation might fail is such functions/VIs are present. For a list of all functions and VIs not supported by the LabVIEW C Generator, refer to Unsupported VIs and Functions (C Generator) in the LabVIEW Help Workaround: N/A
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| Documentation | ||||||
| 226076 Return |
Discrepancies in the "Including Generated C Code in External Applications" Help topic. 1. Help states: All generated C files except DllMain.c. However, DLLMain.c is not a generated file. It is located in labview\CCodeGen\libsrc\platform\win. 2. The Build Specification output directory path should be added to the list of include directories to compile successfully. Help does not mention this explicitly. Workaround: N/A
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| External Code | ||||||
| 214201 Return |
LabVIEW datatype definitions can conflict with those in external C code LabVIEW defines certain basic datatypes in the generated C code, viz. Boolean, float32, float64. When integrating the LabVIEW generated C code in a larger C application/code base, you should take precautions to avoid datatype definition conflicts. For eg, if the external code base also defines a 32-bit float as "float32", you will get a compiler error. Workaround: There are multiple ways of avoiding type name conflicts: 1. You can use LabVIEW generated datatypes in your top-level C application. These types are defined in LVDefs_plat.h. This file can be found in labview\CCodeGen\inlcude\os, under the directory for your specific operating system. 2. You can redefined your datatypes with names that are different from those used in the LabVIEW generated C code.
|
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| Functions, VIs, and Express VIs | ||||||
| 231444 Return |
C Code Generation might fail is unsupported VIs are added to Entry and Exit actions in a Statechart The Statechart Module lets you configure Entry and Exit actions for every state by adding LabVIEW VIs in an editor. LabVIEW does not warn you if unsupported functions are added to the editor. C Code generation might fail is such functions/VIs are present. For a list of all functions and VIs not supported by the LabVIEW C Generator, refer to Unsupported VIs and Functions (C Generator) in the LabVIEW Help Workaround: N/A
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| 233935 Return |
Some unsupported Express VIs do not report a warning when used in an exported VI When a top level VI is configured for export by adding it to a C Generator Build Specification, LabVIEW performs syntax checking on it to warn the user if unsupported VIs are used on the Block Diagram. However, the following VIs do not cause a warning: Group Digital Signals Set Dynamic Data Attributes Get Dynamic Data Attributes Spectral Measurements Report These VIs will cause the C Generation/Build step to fail. Workaround: N/A
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| 231443 Return |
LabVIEW does not check Entry/Exit action VIs for syntax when using the Statechart Module Statechart module lets you configure Entry and Exit actions for each state. LabVIEW does not check the VIs used in these actions for syntax. If you use unsupported VIs in the Entry/Exit actions, C generation might fail. Workaround: N/A
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| 231779 Return |
Control References and Property Nodes do not report a warning when used in an exported VI When a top level VI is configured for export by adding it to a C Generator Build Specification, LabVIEW performs syntax checking on it to warn the user if unsupported VIs are used on the Block Diagram. However, Control References and Property Nodes do not report a warning. While the C generation step may succeed, using the generated code in an application will cause compilation errors. Workaround: N/A
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Document last updated on 7/30/2010
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