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    <p>Did you specify the output file of compilation (likely the <code>-o</code> option)? By default (for most toolchains), compiling a <code>.c</code> file produces an <code>.o</code> file, not an <code>.obj</code> one.</p> <h2>UPD.</h2> <p>To get Make updating targets when some prerequisites change you have to provide an <strong>exact</strong> dependencies <strong>between files</strong> as far as Make use timestamps to determine whether a file has been changed.</p> <p>That is, <code>all</code> and <code>init</code> could remain as so-called <a href="http://www.gnu.org/software/make/manual/make.html#Phony-Targets" rel="nofollow"><code>.PHONY</code> targets</a>, but it is a good practice to make the rest targets to be files.</p> <pre><code>OUT_DIR := ./output SRC_DIR := ./src OBJ_DIR := ./obj MYBIN := $(OUT_DIR)/myapp.bin OBJS := $(addprefix $(OBJ_DIR)/, \ first.obj \ second.obj \ third.obj \ four.obj \ five.obj \ six.obj \ seven.obj \ eight.obj \ nine.obj) .PHONY : all mkdir-output mkdir-obj all : $(MYBIN) mkdir-output : @mkdir -p $(OUT_DIR) mkdir-obj : @mkdir -p $(OBJ_DIR) $(MYBIN) : $(OBJS) | mkdir-output $(LK) $^ -o $@ $(OBJS) : | mkdir-out $(OBJS) : $(OBJ_DIR)/%.obj : $(SRC_DIR)/%.c $(CC) $&lt; -object=$@ $(CC_OPT) </code></pre> <p>The last rule is GNU Make's <a href="http://www.gnu.org/software/make/manual/make.html#Static-Pattern" rel="nofollow">static pattern rule</a>. And the <code>mkdir-xxx</code> prerequisites after a pipe sign <code>|</code> are <a href="http://www.gnu.org/software/make/manual/make.html#Prerequisite-Types" rel="nofollow">order-only</a> ones.</p>
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    1. USEldar Abusalimov
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    1. COYes I did. This is a proprietary C compiler for a specific HW. The command line is: `$(CC) ./src/whatever.c -object=./obj/whatever.obj $(CC_OPT)`. Every `$(CC)` command creates successfully its `.obj` file in the right folder. The problem is that `make` doesn't mark `.obj` files that depend on `touch`ed `.c` files as outdated.
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      1. USBenoit Duffez
    2. CO@Bicou, see an updated answer.
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    3. COThank you. I was not making good use of `.PHONY` targets. I added some `@touch dummy_project1` to help `make` understand the build dependencies. I also cleaned up a bit, and now it's working fine. Thank you so much.
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