NAME
gccmakedep - create dependencies in makefiles using ’gcc -M’
SYNOPSIS
gccmakedep [ -sseparator ] [ -fmakefile ] [ -a ] [ -- options -- ]
sourcefile ...
DESCRIPTION
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.
EXAMPLE
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 example,
SRCS = file1.c file2.c ...
CFLAGS = -O -DHACK -I../foobar -xyz
depend:
gccmakedep -- $(CFLAGS) -- $(SRCS)
OPTIONS
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 include
path.
-a Append the dependencies to the file instead of replacing
existing dependencies.
-fmakefile
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.
-sstring
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 normally.
SEE ALSO
gcc(1), make(1), makedepend(1).
AUTHOR
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.
Colin Watson wrote this manual page, originally for the Debian Project,
based partly on the manual page for makedepend(1).