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Forum Topic - Recursive makefile dependency problem: (5 Items)

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Stephen Clarke

08/22/2012 11:30 AM

post95022

Recursive makefile dependency problem

Hi all,

We use QNX 6.2.1 and 6.5.0, the recursive makefile system and build from
the command line. I'm trying to improve the way dependencies are
handled.

Currently we use EXTRA_CCDEPS to specify all of our header files. This
correctly picks up on a change to a header but it causes a full build to
occur.

On a different platform with a simpler makefile we use the -MD option to
GCC to generate dependency files and then -include these files. This
picks up on a change to a header file and causes a partial build to
occur. This is the behaviour I'd like to set up in QNX.

I've found these two topics which are related to my problem:

http://community.qnx.com/sf/discussion/do/listPosts/projects.toolchain/d
iscussion.core_development_tools.topc20111

http://community.qnx.com/sf/discussion/do/listPosts/projects.toolchain/d
iscussion.core_development_tools.topc8391

Unfortunately I haven't figured out to create the behaviour I'd like
whilst using the recursive makefile system.

I'm fairly new to QNX and to makefiles, so apologies if I've missed
something obvious.

Kind regards,

Stephen

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Will Miles

08/22/2012 12:31 PM

post95027

Re: Recursive makefile dependency problem

Hi Stephen,

In fact we use just such a solution with QNX's recursive make for our projects.   This is from QNX 6.3.2 with GCC 3.3.5,
 so you might have to modify this for your specific QNX and GCC versions - I know the older GCC used in QNX 6.2.1 
doesn't support -MP, for example.   Here is the makefile fragment we use:

# Auto-generate dependencies
CCFLAGS+=-Wp,-MD,$*.d -Wp,-MP,
# Clean them up when we're done
EXTRA_CLEAN+=*.d
# Include the relevant makefiles, but don't get upset if they're not there
-include $(addsuffix .d,$(basename $(notdir $(SRCS))))

Hope this helps some,

-Will

Stephen Clarke

08/23/2012 6:33 AM

post95065

Re: Recursive makefile dependency problem

Hi Will,

That is exactly what I was looking for. Thanks very much for taking the time to post this.

I don't think -MP will affect us and I've switched to -MMD as I don't see the need to include the system header files.

This all works perfectly for 6.5.0, but I have one problem with 6.2.1. I get an error when doing a clean (even though 
the clean seems to work correctly):

1>  make -j 1 -Cx86 -fMakefile clean
1>  make[1]: Entering directory `C:/myProject/x86'
1>  make -j 1 -CDEV -fMakefile clean
1>../../common.mk(107): error : no file name for `-include'
1>  make[2]: Entering directory `C:/myProject/x86/DEV'
1>  C:/QNXsdk/host/win32/x86/usr/bin/rm -f oak-DEV  *.pinfo *.o *.err *.map mapfile *.sym  *.d 
1>  make[2]: Leaving directory `C:/myProject/x86/DEV'
1>  make[1]: Leaving directory `C:/myProject/x86'

Could I check where in common.mk you have your -include? Or if you have any ideas why I'm getting this error?

Many thanks,

Stephen

Will Miles

08/23/2012 10:55 PM

post95108

Re: Recursive makefile dependency problem

Hi Stephen,

I suspect the older version of make has a bug where it gets upset if the macro expands to no files.   Try:

-include $(addsuffix .d,$(basename $(notdir $(SRCS)))) some_dummy_file

just to keep it happy.   The dummy file doesn't need to actually exist - the "-" in front of the include suppresses the 
"include file missing" error.

-Will

Stephen Clarke

08/28/2012 9:31 AM

post95194

Re: Recursive makefile dependency problem

Hi Will,

That's perfect. I think I now have our builds working the way I'd like.

Many thanks for your help with this.

Stephen

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