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Editorial Team
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Asked: 2026-05-28T23:34:16+00:00

I’m using eclipse for the first time. I’m a seasoned VisualStudio user, so I’m

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I’m using eclipse for the first time. I’m a seasoned VisualStudio user, so I’m trying to find similar functionality in eclipse. I have two projects, A and B. Project A spits out libA.a when it’s done compiling. Project B links against libA.a. Here is my problem.

  1. I compile project A then project B, everything is fine.
  2. I make a code change to project A that requires a build of project A.
  3. I try to build project B, but it states that no changes have been detected.

How do I make project B aware of the output of project A?? Currently I’m having to do a clean build of project B for it to re-link against libA.a.

Thanks.

EDIT: In my ProjectB->Path and Symbols->References tab, I have project A checked. This doesn’t relink after project A is rebuilt.

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1 Answer

  1. Editorial Team

    One can work around this problem by using the touch command.

    In Eclipse, as part of C/C++ Build/Settings is the tab ‘Build Steps’. In the pre-build steps command line, enter touch filename.

    filename is any file in your application. This could be the file with main(). This could be a special file just for this workaround, touchdummy.c, which can be a tiny file, which compiles quickly.

    When the application builds, even if you didn’t change any sources, the touch command causes make to rebuild the application. If the library was rebuilt, then the application gets rebuilt with the new library.

    One can read about how touch affects the date/time of the file here.
    http://pubs.opengroup.org/onlinepubs/9699919799/utilities/touch.html

    Edit: The exact command in Eclipse would be touch ${ProjDirPath}/src/main.c

    Edit: This command should work, but it appears that if the ‘main’ project did not change, the pre-build step is not executed. Also the touch command causes eclipse to prompt to reload the file it touched. A large annoyance.

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