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gccmakedep - create dependencies in makefiles using 'gcc -M'
[ -sseparator ] [ -fmakefile ] [ -a ] [ -- options -- ] sourcefile ...
gccmakedep program calls 'gcc -M' to output makefile rules describing the
dependencies of each sourcefile, so that make(1)
knows which object files
must be recompiled when a dependency has changed.
By default, gccmakedep
places its output in the file named makefile if it exists, otherwise Makefile.
An alternate makefile may be specified with the -f option. It first searches
the makefile for a line beginning with
# DO NOT DELETE
or one provided
with the -s option, as a delimiter for the dependency output. If it finds
it, it will delete everything following this up to the end of the makefile
and put the output after this line. If it doesn't find it, the program will
append the string to the makefile and place the output after that.
gccmakedep will be used in a makefile target so that typing 'make depend'
will bring the dependencies up to date for the makefile. For example,
SRCS = file1.c file2.c ...
CFLAGS = -O -DHACK -I../foobar -xyz
gccmakedep -- $(CFLAGS) -- $(SRCS)
The program will ignore any option that it does not understand,
so you may use the same arguments that you would for gcc(1)
-D and -U options to define and undefine symbols and -I to set the include
The version of the gccmakedep included in
this X.Org Foundation release was originally written by the XFree86 Project
based on code supplied by Hongjiu Lu.
- Append the dependencies to the file instead of replacing existing
- Filename. This allows you to specify an alternate
makefile in which gccmakedep can place its output. Specifying lq-rq as the
file name (that is, -f-) sends the output to standard output instead of modifying
an existing file.
- Starting string delimiter. This option permits
you to specify a different string for gccmakedep to look for in the makefile.
The default is lq# DO NOT DELETErq.
- -- options --
- If gccmakedep encounters a
double hyphen (--) in the argument list, then any unrecognized arguments
following it will be silently ignored. A second double hyphen terminates
this special treatment. In this way, gccmakedep can be made to safely ignore
esoteric compiler arguments that might normally be found in a CFLAGS make
macro (see the EXAMPLE section above). -D, -I, and -U options appearing between
the pair of double hyphens are still processed normally.
Colin Watson wrote this manual page,
originally for the Debian Project, based partly on the manual page for
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