configure.ac (configure.in)
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configure.ac (sometimes also named: configure.in) is an input file for autoconf. It contains tests that check for conditions that are likely to differ on different platforms. The tests are made by actually invoke autoconf macros.
configure.ac is processed by m4 which produces ./configure. Basically, configure.ac is copied, but macros found within configure.ac are expanded.
A configure.ac should contain the following macros:
- AC_INIT
- AC_PREREQ
- AM_INIT_AUTOMAKE
- AM_MAINTAINER_MODE
- AC_EXEEXT
- AC_PROG_CC
- AC_PROG_CXX
- AM_PROG_LIBTOOL
- AC_DEFINE (???)
- AC_OUTPUT
autoscan helps create a
configure.ac
file by examining source files. It creates a configure.scan
file which can then be changed for a configure.ac file.Typical layout
AC_INIT(package, version, bug-report-address)package informationprogram checkslibrary checksheader file checkstype checksstructure checkscompiler characteristics checkslibrary functions checksystem service checksAC_CONFIG_FILES([...])AC_OUTPUT
Macros
AC_INIT
<strong>AC_INIT</strong>(package, version, [bug-report], [tar-name])
AC_INIT and AC_OUTPUT are the two only required macros by the
configure
script.program_file is used to check wheter autoconf finds it. If it doesn't find it, it is somehow screwed up.
AC_INIT generates the following m4 macros, output variables and preprocessor symbols:
- [AC_]PACKAGE_NAME
- [AC_]PACKAGE_TARNAME
- [AC_]PACKAGE_VERSION
- [AC_]PACKAGE_STRING
- [AC_]PACKAGE_BUGREPORT
AC_PREREQ
<strong>AC_PREREQ</strong>(version)
Indicates the version of autoconf that is used.
AM_INIT_AUTOMAKE
AM_INIT_AUTOMAKE([options])
The following form obsolete: the package and the version can be optained by AC_INIT
AM_INIT_AUTOMAKE(package, version [, no-define])
This macro is always needed for automake
AC_DEFINE
Defines a c preprocessor macro
For example
AC_DEFINE(DEBUG)
or AC_DEFINE(VERSION, "2.3")
AC_DEFINE_UNQUOTED
Defines a preprocessor macro with shell expansion
AC_DEFINE_UNQUOTED(FOO, "${some_variable}")
AC_CHECK_LIB
Checks for a symbol within a library
AC_ARG_ENABLE
AC_OUTPUT
<strong>AC_OUTPUT</strong>(Makefile foo_config)
There should be an AC_OUTPUT for each Makefile.am in the project.
AC_INIT and AC_OUTPUT are the two only required macros by the
configure
script.AC_OUTPUT generates the files that are required for the building process.
Lists the names of the files that will be output by the ./configure script.
AC_CHECK_FUNCS(func-name-1 func-name-2)
Checks if a functions exist (within the c library ???).
If they exist, it defines HAVE_func-name-n
AC_HEADERS
Defines
STDC_HEADER
if Ansi C header files are present. It actually assumes that the header files are present if it finds stdlib.h stdarg.h string.h and float.h.AC_HEADERS
Checks if a header file is present. ???
If so, defines HAVE_header.
AC_EGREP_HEADER
AC_FUNC_xxx
AC_FUNC_STRFTIME
Checks if strftime exists. Includes libintl in LIBS if needed (eg for SCO).
AC_FUNC_MEMCMP
Checks if memcmp exists and is 8-bit clean.
AC_FUNC_UTIME_NULL
Checks whether
utime
accepts a NULL second argument to set the file change time to the current time.See also AC_FUNC_xxx
AC_PROG_INSTALL
Generates an install target, so that it is possible to install the program with
make install
Sets INSTALL to a BSD compatible install programm, if possible. If not possible, sets it to some-dir/install-sh. In order to determine some-dir, it checkes the directories specified with AC_CONFIG_AUX_DIR.
Also sets variable INSTALL_PROGRAM to ${INSTALL} and INSTALL_DATA to ${INSTALL} -m 644.
If AC_PROG_INSTALL is used but
configure
cannot find an install-sh, configure will report an error.AC_CONFIG_AUX_DIR
AC_CONFIG_HEADER
AC_CONFIG_SRCDIR
AC_CONFIG_FILES
AC_PROG_CC
Checks for a working C compiler and discovers its characteristics.
AC_PROG_CXX
Like AC_PROG_CC, but for C++ compilers.
AM_DISABLE_SHARED
See AM_PROG_LIBTOOL.
AM_PROG_LIBTOOL
Used if building libraries. By default, libraries are built as shared libraries. In order to build static libraries,AM_DISABLE_SHARED needs to be defined before AM_PROG_LIBTOOL. This behaviour can be overriden with the --enable_shared and --disable_shared configure options.
AM_CONFIG_HEADER
<strong>AM_CONFIG_HEADER</strong>(config.h)<strong>AM_CONFIG_HEADER</strong>(config.h:config.in)
It may optionally name the input file for the output file, by default this is config.h.in, however, this works poorly on dos.
Names the header file which will hold the preprocessor macro definitions for compile time. Normally, this is
config.h
. The source files will then #include "config.h"
.Generates a portability header file, requires a accconfig.h file.
???? Use AC_CONFIG_HEADER instead of AM_CONFIG_HEADER if you're not using automake. ????
??? In order to use AM_CONFIG_HEADER, a
stamp-h
file is needed ???.AM_MAINTAINER_MODE
AC_EXEEXT
Always present in Cygnus configure scripts, finds the executable suffix on the system (.exe for windows, empty for unix).
AC_STRUCT_TM
Defines TM_IN_SYS_TIME if <time
0 0
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