Eclipse CDT not building project on header file change

eclipse reference header eclipse-cdt
haelix picture haelix · Mar 27, 2012 · Viewed 7.3k times · Source

I have Eclipse Platform 3.7.2 and CDT 8.0.2.

When I want to do 'Build All' headers from other workspace projects are not counted as dependencies, and nothing is rebuilt.

I have a hello world application and a static library project. The static library is set as a reference in Project Properties -> c/c++ general -> Paths and SYmbols -> References tab -> checked 'Active'. That's the only setting I changed.

By the way, It totally beats me why Eclipse has an additional "Project References" top-level item under Project Properties.

Anyway, I tried both the External Builder (which gets selected by default on project creation) and the INternal Builder, also coupled with combinations of the global setting 'Preferences -> c++ -> Build -> Build configurations only when there are Eclipse resource changes........'

Thanks for any thoughts on this.

Update: This is the console output when building dependent project Proj2 (Proj1 is the lib). 'make all' is called but it merely re-links, it doesn't recompile Main.cpp as it should. Anyone out there familiar with eclipse-generated makefiles? Thanks again.

**** Build of configuration Debug for project Proj2 ****

make all 
Building target: Proj2
Invoking: Cross G++ Linker
g++ -L"/home/user/.eclipse-workspace/Proj1/Debug" -o "Proj2"  ./Main.o   -lProj1
Finished building target: Proj2


**** Build Finished ****

Edit: This is 1.5 years old already, wanted to add that an Eclipse bug had been filed for this: https://bugs.eclipse.org/bugs/show_bug.cgi?id=375800

Answer

Jan picture Jan · Sep 19, 2013

there exists a bug for this issue: https://bugs.eclipse.org/bugs/show_bug.cgi?id=375800

And a working and neat workaround (The orignal requester knows this already). So I just crosslink to the actual answer :) https://bugs.eclipse.org/bugs/show_bug.cgi?id=375800#c11

All credits to Krzysztof Czaińsk

In your project c or c++ compiler settings add -MT ${OUTPUT_PREFIX}${OUTPUT} after the flags:

${COMMAND} ${FLAGS} -MT ${OUTPUT_PREFIX}${OUTPUT} ${OUTPUT_FLAG} ${OUTPUT_PREFIX}${OUTPUT} ${INPUTS}

This will create the correct .d-files

Addition: The workaround has one side-effect. After a clean make all always runs twice before it says nothing to do. Still better than not compiling after a change ;-)

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