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The commands in built-in implicit rules make liberal use of certain
predefined variables. You can alter these variables in the makefile,
with arguments to make
, or in the environment to alter how the
implicit rules work without redefining the rules themselves. You can
cancel all variables used by implicit rules with the `-R' or
`--no-builtin-variables' option.
For example, the command used to compile a C source file actually says `$(CC) -c $(CFLAGS) $(CPPFLAGS)'. The default values of the variables used are `cc' and nothing, resulting in the command `cc -c'. By redefining `CC' to `ncc', you could cause `ncc' to be used for all C compilations performed by the implicit rule. By redefining `CFLAGS' to be `-g', you could pass the `-g' option to each compilation. All implicit rules that do C compilation use `$(CC)' to get the program name for the compiler and all include `$(CFLAGS)' among the arguments given to the compiler.
The variables used in implicit rules fall into two classes: those that are
names of programs (like CC
) and those that contain arguments for the
programs (like CFLAGS
). (The "name of a program" may also contain
some command arguments, but it must start with an actual executable program
name.) If a variable value contains more than one argument, separate them
with spaces.
Here is a table of variables used as names of programs in built-in rules:
AR
AS
CC
CXX
CO
CPP
FC
GET
LEX
PC
YACC
YACCR
MAKEINFO
TEX
TEXI2DVI
WEAVE
CWEAVE
TANGLE
CTANGLE
RM
Here is a table of variables whose values are additional arguments for the programs above. The default values for all of these is the empty string, unless otherwise noted.
ARFLAGS
ASFLAGS
CFLAGS
CXXFLAGS
COFLAGS
co
program.
CPPFLAGS
FFLAGS
GFLAGS
get
program.
LDFLAGS
LFLAGS
PFLAGS
RFLAGS
YFLAGS
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