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POGNU make dependency issue
 

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  1. POGNU make dependency issue
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    <p>To make it simple, say I have the following folders:</p> <ul> <li><code>./src/</code> with many .c files</li> <li><code>./obj/</code> with many .obj files</li> <li><code>./output/</code> with my binaries I want to build</li> </ul> <p>My makefile is as follows:</p> <pre><code>all: init mybin # init commands init: mkdir obj mkdir output mybin: project1 project2 project3 $(CC) src/misc.c ... etc $(LK) obj/first.obj obj/second.obj obj/third.obj obj/four.obj obj/five.obj obj/six.obj obj/seven.obj obj/eight.obj obj/nine.obj -o output/myapp.bin project1: obj/first.obj obj/second.obj obj/third.obj obj/first.obj: src/first.c $(CC) first.c ... etc obj/second.obj: src/second.c $(CC) obj/second.c ... etc obj/third.obj: src/third.c $(CC) obj/third.c ... etc project2: obj/four.obj obj/five.obj obj/six.obj obj/four.obj: src/four.c $(CC) four.c ... etc obj/five.obj: src/five.c $(CC) obj/five.c ... etc obj/six.obj: src/six.c $(CC) obj/six.c ... etc project3: obj/seven.obj obj/eight.obj obj/nine.obj obj/seven.obj: src/seven.c $(CC) seven.c ... etc obj/eight.obj: src/eight.c $(CC) obj/eight.c ... etc obj/nine.obj: src/nine.c $(CC) obj/nine.c ... etc </code></pre> <p>The first time I ran <code>make all</code>, everything compiled find. Then I did:</p> <pre><code>$ touch src/four.c $ make all $ </code></pre> <p>But <code>make</code> exits without compiling anything. I guess it did not detect that one of the .c files had changed, however I don't see what's wrong with my dependencies.</p> <p>What I expected:<br> <code>touch</code>ing <code>src/four.c</code> should have marked <code>obj/four.obj</code> obsolete, and <code>project2</code> aswell, hence marking <code>mybin</code> obsolete too. This chain should trigger a new compilation of <code>src/four.c</code> to <code>obj/four.obj</code> and then a new linkage of the whole project.</p>
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    1. USBenoit Duffez
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    1. COrun make -d all and see what's outdated
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      1. UShroptatyr
    2. COit's trying a LOT of "implicit prerequisite"s which have no meaning. I'm trying to build a file called `FW.mot` and `make` is trying to find `FW.mot.c` or `FW.mot.cc` or `FW.mot.F` which don't exist!!!
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      1. POGNU make dependency issue
      1. USBenoit Duffez
    3. COwell, grep the relevant files, if it says FW.mot is up to date, then check all dependencies, if the one that should trigger the rebuild isn't there, then you haven't listed it in the Makefile
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      1. POGNU make dependency issue
      1. UShroptatyr
 

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