<br>Thanks for answering my question.<br><br><div class="gmail_quote">2009/5/27 Tyler Roscoe <span dir="ltr"><<a href="mailto:tyler@cryptio.net">tyler@cryptio.net</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im">On Wed, May 27, 2009 at 11:01:51PM +0000, <a href="mailto:idlecat511@gmail.com">idlecat511@gmail.com</a> wrote:<br>
> foo.h is generated from foo.x. And foo.h is included by bar.h. And then<br>
> bar.h is included by a lot of c files. So actually every c files including<br>
> bar.h depends on foo.h.<br>
> But the file number is so big that I don't want to add dependency for each<br>
> one.<br>
<br>
</div>CMake knows how to resolve these header dependencies. So any file that<br>
#includes (or #includes something that #includes) foo.h will be<br>
recompiled if foo.h changes. You don't need to do anything else for this<br>
part.</blockquote><div> <br>The problem I ran into when using add_custom_command is that C files will be compiled before foo.h is generated and the compilation will fail.<br><br>Oh, maybe it's because the foo.h is actually named as foo_blahblah_h. I'll give it a try.<br>
</div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
<div class="im"><br>
> How can I specify foo.x is generated before all the c files being compiled?<br>
> It seems add_custom_target works but it will regenerate foo.h every time<br>
> even the foo.x is not modified.<br>
<br>
</div>If your custom_target() has correct OUTPUT and DEPENDS parameters, this<br>
should not happen. Are you specifying ALL in your add_custom_target()?</blockquote><div> </div><div>The manual doesn't mention OUTPUT can be specified in add_custom_target. And it reads that "(The target) is ALWAYS CONSIDERED OUT OF DATE even if the commands try to create a file with the name of the target.".</div>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>
<font color="#888888"><br>
tyler<br>
</font></blockquote></div><br>