Re: GNU Make - Problem defining pattern rules

[Henrik Carlqvist]

Dave <davej2000@gmail.com> wrote:

> When I execute:
> make src/application/SampleApplication
> 
> I see  "Building a Binary"
> 
> When I execute
> make src/libraries/PluginOne/libPluginOne.so
> 
> I see "make: Nothing to be done for `src/libraries/PluginOne/
> libPluginOne.so'."
> 
> Can anyone explain why the pattern rule for the binary appears to work,
> but the pattern rule for a .so library doesn't?

The "Nothing to be done..." message means that gnu makes considers the
target to already be up to date. This means in your case that
src/libraries/PluginOne/libPluginOne.so already exists and is newer than
src/libraries/PluginOne/libPluginOne.o. It also means that
src/libraries/PluginOne/libPluginOne.o is newer than any of its
prerequisites.

> ----------------------------------------------------------
> # Some Pattern Rules
> #
> %.o: %.cpp
>         @echo "Building Object Files"
> 
> %.so: %.o
>         @echo "Building a Library"
> 
> %: %.o
>         @echo "Building a Binary"

regards Henrik
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