gccmakedep - create dependencies in makefiles using 'gcc -M'
gccmakedep [ -sseparator ] [ -fmakefile ] [
-a ] [ -- options -- ] sourcefile ...
The 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.
Normally, gccmakedep will be used in a makefile target so that typing
'make depend' will bring the dependencies up to date for the makefile. For
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), including -D and
-U options to define and undefine symbols and -I to set the
gcc(1), make(1), makedepend(1).
The version of the gccmakedep included in this X.Org Foundation release
was originally written by the XFree86 Project based on code supplied by
- 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 “-” 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
“# DO NOT DELETE”.
- -- 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
Colin Watson wrote this manual page, originally for the Debian
Project, based partly on the manual page for makedepend(1).