(automake-1.16.info)Optional
6.2 Other things Automake recognizes
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Every time Automake is run it calls Autoconf to trace ‘configure.ac’.
This way it can recognize the use of certain macros and tailor the
generated ‘Makefile.in’ appropriately. Currently recognized macros and
their effects are:
‘AC_CANONICAL_BUILD’
‘AC_CANONICAL_HOST’
‘AC_CANONICAL_TARGET’
Automake will ensure that ‘config.guess’ and ‘config.sub’ exist.
Also, the ‘Makefile’ variables ‘build_triplet’, ‘host_triplet’ and
‘target_triplet’ are introduced. See Note: Getting the Canonical
System Type.
‘AC_CONFIG_AUX_DIR’
Automake will look for various helper scripts, such as
‘install-sh’, in the directory named in this macro invocation.
(The full list of scripts is: ‘ar-lib’, ‘config.guess’,
‘config.sub’, ‘depcomp’, ‘compile’, ‘install-sh’, ‘ltmain.sh’,
‘mdate-sh’, ‘missing’, ‘mkinstalldirs’, ‘py-compile’,
‘test-driver’, ‘texinfo.tex’, ‘ylwrap’.) Not all scripts are
always searched for; some scripts will only be sought if the
generated ‘Makefile.in’ requires them.
If ‘AC_CONFIG_AUX_DIR’ is not given, the scripts are looked for in
their standard locations. For ‘mdate-sh’, ‘texinfo.tex’, and
‘ylwrap’, the standard location is the source directory
corresponding to the current ‘Makefile.am’. For the rest, the
standard location is the first one of ‘.’, ‘..’, or ‘../..’
(relative to the top source directory) that provides any one of the
helper scripts. Note: Finding ‘configure’ Input.
Required files from ‘AC_CONFIG_AUX_DIR’ are automatically
distributed, even if there is no ‘Makefile.am’ in this directory.
‘AC_CONFIG_LIBOBJ_DIR’
Automake will require the sources file declared with ‘AC_LIBSOURCE’
(see below) in the directory specified by this macro.
‘AC_CONFIG_HEADERS’
Automake will generate rules to rebuild these headers from the
corresponding templates (usually, the template for a ‘foo.h’ header
being ‘foo.h.in’). Older versions of Automake required the use of
‘AM_CONFIG_HEADER’; this is no longer the case, and that macro has
indeed been removed.
As with ‘AC_CONFIG_FILES’ (Note: Requirements), parts of the
specification using shell variables will be ignored as far as
cleaning, distributing, and rebuilding is concerned.
‘AC_CONFIG_LINKS’
Automake will generate rules to remove ‘configure’ generated links
on ‘make distclean’ and to distribute named source files as part of
‘make dist’.
As for ‘AC_CONFIG_FILES’ (Note: Requirements), parts of the
specification using shell variables will be ignored as far as
cleaning and distributing is concerned. (There are no rebuild
rules for links.)
‘AC_LIBOBJ’
‘AC_LIBSOURCE’
‘AC_LIBSOURCES’
Automake will automatically distribute any file listed in
‘AC_LIBSOURCE’ or ‘AC_LIBSOURCES’.
Note that the ‘AC_LIBOBJ’ macro calls ‘AC_LIBSOURCE’. So if an
Autoconf macro is documented to call ‘AC_LIBOBJ([file])’, then
‘file.c’ will be distributed automatically by Automake. This
encompasses many macros like ‘AC_FUNC_ALLOCA’, ‘AC_FUNC_MEMCMP’,
‘AC_REPLACE_FUNCS’, and others.
By the way, direct assignments to ‘LIBOBJS’ are no longer
supported. You should always use ‘AC_LIBOBJ’ for this purpose.
Note: ‘AC_LIBOBJ’ vs. ‘LIBOBJS’.
‘AC_PROG_RANLIB’
This is required if any libraries are built in the package. Note:
Particular Program Checks.
‘AC_PROG_CXX’
This is required if any C++ source is included. Note: Particular
Program Checks.
‘AC_PROG_OBJC’
This is required if any Objective C source is included. Note:
Particular Program Checks.
‘AC_PROG_OBJCXX’
This is required if any Objective C++ source is included. Note:
Particular Program Checks.
‘AC_PROG_F77’
This is required if any Fortran 77 source is included. Note:
Particular Program Checks.
‘AC_F77_LIBRARY_LDFLAGS’
This is required for programs and shared libraries that are a
mixture of languages that include Fortran 77 (Note: Mixing Fortran
77 With C and C++). Note: Autoconf macros supplied with
Automake.
‘AC_FC_SRCEXT’
Automake will add the flags computed by ‘AC_FC_SRCEXT’ to
compilation of files with the respective source extension (Note:
Fortran Compiler Characteristics.).
‘AC_PROG_FC’
This is required if any Fortran 90/95 source is included. This
macro is distributed with Autoconf version 2.58 and later. Note:
Particular Program Checks.
‘AC_PROG_LIBTOOL’
Automake will turn on processing for ‘libtool’ (*note Introduction:
(libtool)Top.).
‘AC_PROG_YACC’
If a Yacc source file is seen, then you must either use this macro
or define the variable ‘YACC’ in ‘configure.ac’. The former is
preferred (Note: Particular Program Checks.
).
‘AC_PROG_LEX’
If a Lex source file is seen, then this macro must be used. Note:
Particular Program Checks.
‘AC_REQUIRE_AUX_FILE’
For each ‘AC_REQUIRE_AUX_FILE([FILE])’, ‘automake’ will ensure that
‘FILE’ exists in the aux directory, and will complain otherwise.
It will also automatically distribute the file. This macro should
be used by third-party Autoconf macros that require some supporting
files in the aux directory specified with ‘AC_CONFIG_AUX_DIR’
above. Note: Finding ‘configure’ Input.
‘AC_SUBST’
The first argument is automatically defined as a variable in each
generated ‘Makefile.in’, unless ‘AM_SUBST_NOTMAKE’ is also used for
this variable. Note: Setting Output Variables.
For every substituted variable VAR, ‘automake’ will add a line ‘VAR
= VALUE’ to each ‘Makefile.in’ file. Many Autoconf macros invoke
‘AC_SUBST’ to set output variables this way, e.g., ‘AC_PATH_XTRA’
defines ‘X_CFLAGS’ and ‘X_LIBS’. Thus, you can access these
variables as ‘$(X_CFLAGS)’ and ‘$(X_LIBS)’ in any ‘Makefile.am’ if
‘AC_PATH_XTRA’ is called.
‘AM_CONDITIONAL’
This introduces an Automake conditional (Note: Conditionals).
‘AM_COND_IF’
This macro allows ‘automake’ to detect subsequent access within
‘configure.ac’ to a conditional previously introduced with
‘AM_CONDITIONAL’, thus enabling conditional ‘AC_CONFIG_FILES’
(Note: Usage of Conditionals).
‘AM_GNU_GETTEXT’
This macro is required for packages that use GNU gettext (Note:
gettext). It is distributed with gettext. If Automake sees this
macro it ensures that the package meets some of gettext’s
requirements.
‘AM_GNU_GETTEXT_INTL_SUBDIR’
This macro specifies that the ‘intl/’ subdirectory is to be built,
even if the ‘AM_GNU_GETTEXT’ macro was invoked with a first
argument of ‘external’.
‘AM_MAINTAINER_MODE([DEFAULT-MODE])’
This macro adds an ‘--enable-maintainer-mode’ option to
‘configure’. If this is used, ‘automake’ will cause
“maintainer-only” rules to be turned off by default in the
generated ‘Makefile.in’s, unless DEFAULT-MODE is ‘enable’. This
macro defines the ‘MAINTAINER_MODE’ conditional, which you can use
in your own ‘Makefile.am’. Note: maintainer-mode.
‘AM_SUBST_NOTMAKE(VAR)’
Prevent Automake from defining a variable VAR, even if it is
substituted by ‘config.status’. Normally, Automake defines a
‘make’ variable for each ‘configure’ substitution, i.e., for each
‘AC_SUBST([VAR])’. This macro prevents that definition from
Automake. If ‘AC_SUBST’ has not been called for this variable,
then ‘AM_SUBST_NOTMAKE’ has no effects. Preventing variable
definitions may be useful for substitution of multi-line values,
where ‘VAR = @VALUE@’ might yield unintended results.
‘m4_include’
Files included by ‘configure.ac’ using this macro will be detected
by Automake and automatically distributed. They will also appear
as dependencies in ‘Makefile’ rules.
‘m4_include’ is seldom used by ‘configure.ac’ authors, but can
appear in ‘aclocal.m4’ when ‘aclocal’ detects that some required
macros come from files local to your package (as opposed to macros
installed in a system-wide directory, Note: aclocal Invocation).
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