Re: reduce compilation times?

[mahmoodn <nt_mahmood at yahoo dot com>]

>CXX = g++

>foo.o : foo.cc foo.h.gch
><tab>$(CXX) -c $<

>foo.h.gch: foo.h
><tab>$(CXX) -c $<

Interesting... So these lines should create foo.h.gch? I will work on it




Tom Browder wrote:
> 
> On Dec 5, 2007 1:44 AM, mahmoodn <nt_mahmood@yahoo.com> wrote:
>>
>> For example look at this paragraph in that link:
>>
>> >To create a precompiled header file, simply compile it as you would any
>> other file, if necessary using the -x option to make >the driver treat it
>> as
>> a C or C++ header file. You will probably want to use a tool like make to
>> keep the precompiled header >up-to-date when the headers it contains
>> change.
>>
>> I can not understand it. My little understanding is, I just use normal
>> "make" for the first time. Then the compiler would create some
>> precompiled
>> headers. After doing this, I could not find ant gch file for precompiled
>> header.
> 
> No, it won't do it automaticalyy.  You have to modify your Makefile a
> little.  Say we have foo.cc and its header, foo.h, then something like
> this in the Makefile should work:
> 
> CXX = g++
> 
> foo.o : foo.cc foo.h.gch
> <tab>$(CXX) -c $<
> 
> foo.h.gch: foo.h
> <tab>$(CXX) -c $<
> 
> -Tom
> 
> Tom Browder
> Niceville, Florida
> USA
> 
> 

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