Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Thu, 27 Mar 1997 14:08:14 +0000

Russell,

Russell J. Page, Sr. wrote:
> 
> During Make, I often find an *.h file (which is already in the same
> directory as the corresponding *.c file) being "installed" in the
> include directory above, by the makefile using "INC = file.h". It
> appears that this is not required, but rather it is an attempt by EPICS
> to keep all of it's *.h files together in one place. Question: How does
> Make 'know' where to install the *.h file ?

The main purpose of this installation of .h files is not for the
compilation of the .c file itself, but for other .c files within other
directories which call the library which is being built.  The .h file
should be kept in the source directory with the .c file to which it
refers, but can be referenced from anywhere in the base build structure
without having to have lots of -I../somewhere options.

Make installs the INC files into the directory named in the Make
variable INSTALL_INCLUDE. In base/config/CONFIG_COMMON:
	INSTALL_INCLUDE = $(INSTALL_LOCATION)/include
	INSTALL_LOCATION = $(TOP)
TOP is defined in each Makefile, and points to base.

Note that there is a base/src/include directory which is distributed
with a number of .h files in it, and contains a Makefile.Unix which
lists these in INC so they get installed.  Don't confuse this directory
with base/include which is where the .h files get installed into.

-- Andrew
   ___
 .'   `.	Andrew Johnson, Head of Electronics
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System