Roland Ver. 4.5 Información técnica descargar pdf (Pagina 126)

116 GNU make

For example, the recipe 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.

The following tables describe of some of the more commonly-used predeﬁned variables.

This list is not exhaustive, and the default values shown here may not be what make selects

for your environment. To see the complete list of predeﬁned variables for your instance of

GNU make you can run ‘make -p’ in a directory with no makeﬁles.

Here is a table of some of the more common variables used as names of programs in

built-in rules:

AR Archive-maintaining program; default ‘ar’.

AS Program for compiling assembly ﬁles; default ‘as’.

CC Program for compiling C programs; default ‘cc’.

CXX Program for compiling C++ programs; default ‘g++’.

CPP Program for running the C preprocessor, with results to standard output; de-

fault ‘$(CC) -E’.

FC Program for compiling or preprocessing Fortran and Ratfor programs; default

‘f77’.

M2C Program to use to compile Modula-2 source code; default ‘m2c’.

PC Program for compiling Pascal programs; default ‘pc’.

CO Program for extracting a ﬁle from RCS; default ‘co’.

GET Program for extracting a ﬁle from SCCS; default ‘get’.

LEX Program to use to turn Lex grammars into source code; default ‘lex’.

YACC Program to use to turn Yacc grammars into source code; default ‘yacc’.

LINT Program to use to run lint on source code; default ‘lint’.

MAKEINFO Program to convert a Texinfo source ﬁle into an Info ﬁle; default ‘makeinfo’.

TEX Program to make T

X dvi ﬁles from T

X source; default ‘tex’.

TEXI2DVI Program to make T

X dvi ﬁles from Texinfo source; default ‘texi2dvi’.

WEAVE Program to translate Web into T

X; default ‘weave’.

CWEAVE Program to translate C Web into T

X; default ‘cweave’.

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