0000297: Build: inclusion of _m.h files may fail due to .msg file not translated to C++ in time

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0000297

OMNeT++

IDE / C++ development

public

2011-05-11 07:02

2011-05-11 07:04

Reporter

andras

Assigned To

andras

Priority

normal

Severity

minor

Reproducibility

have not tried

Status

resolved

Resolution

fixed

Platform

OS Version

Product Version

4.1

Target Version

Fixed in Version

Summary

0000297: Build: inclusion of _m.h files may fail due to .msg file not translated to C++ in time

Description

Sometimes there are spurious "cannot include xxx_m.h: no such file or directory" errors during build, while the corresponding .msg file exists. The Makefile somehow doesn't invoke opp_msgc in time for that .msg file.

Analysis reveals that this happens when the .cc file includes xxx_m.h via a header file (say foo.h) which is marked as "ambiguous include" in the IDE. (The warning for the #include "foo.h" line is: "Makefile autodeps: ambiguous include (more than one matching file found)", meaning there are more than one foo.h files in the project.) Looking at the Makefile, the dependencies for the .cc file DON'T contain foo.h (or xxx_m.h), which is apparently why make doesn't know that xxx_m.h will be needed for compiling the .cc file, and doesn't invoke opp_msgc.

Thus, the root cause of the problem seems to be that the makefile generator leaves out ambiguous includes from the dependencies. Instead of leaving out foo.h, it should play safe and list both (all) foo.h files in the project as the dependency of the .cc file.

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Notes
(0000436) andras (administrator) 2011-05-11 07:04	Events go like this: - #include "TED.h" is ambiguous in some Foo.cc - thus, files that TED.h includes are not counted as dependency for Foo.cc - so, if even TED.h includes IntServ_m.h, IntServ_m.h is NOT listed in Foo.cc's dependency list in the generated Makefile - therefore, the Makefile doesn't ensure that IntServ.msg is processed with opp_msgc before Foo.cc is compiled - result: IntServ_m.h is missing when Foo.cc is compiled --> ERROR

(0000437) andras (administrator) 2011-05-11 07:04	Fixed.

Issue History
Date Modified	Username	Field	Change
2011-05-11 07:02	andras	New Issue
2011-05-11 07:04	andras	Note Added: 0000436
2011-05-11 07:04	andras	Note Added: 0000437
2011-05-11 07:04	andras	Status	new => resolved
2011-05-11 07:04	andras	Fixed in Version	=> 4.2b3
2011-05-11 07:04	andras	Resolution	open => fixed
2011-05-11 07:04	andras	Assigned To	=> andras