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dnl This is the input file which autoconf uses to construct a
dnl "configure" script for the tecla library. It is a bourne shell
dnl script which autoconf pre-processes with the m4 preprocessor to
dnl expand autoconf-defined m4 macros such as AC_INIT().  The
dnl following line just initializes autoconf. Autoconf interprets the
dnl single argument as the name of an arbitrary file, which it uses to
dnl ensure that it is being run correctly from the directory which
dnl contains the libtecla source code.

AC_INIT(getline.c)

dnl Here we set the major version number of the tecla library.
dnl Incrementing this number implies that a change has been made to
dnl the library's public interface, which makes it binary incompatible
dnl with programs that were linked with previous shared versions of
dnl the tecla library.  Incompatible changes of this type should be
dnl avoided at all costs, so it is hoped that the major version number
dnl won't ever have to change. The major version number must be a
dnl small integer number, preferably a single numeric digit.

AC_SUBST(MAJOR_VER)
MAJOR_VER="1"

dnl Set the minor version number of the tecla library. This number
dnl should be incremented by one whenever additional functionality,
dnl such as new functions or modules, are added to the library. The
dnl idea is that a program that was linked with a shared library of
dnl the same major version number, but a lower minor version number,
dnl will continue to function when the run-time loader links it
dnl against the updated version.  The minor version number must be a
dnl small integer number, which should be reset to 0 whenever the
dnl major version number is incremented.

AC_SUBST(MINOR_VER)
MINOR_VER="6"

dnl Set the micro version number of the tecla library. This is
dnl incremented whenever modifications to the library are made which
dnl make no changes to the public interface, but which fix bugs and/or
dnl improve the behind-the-scenes implementation.  The micro version
dnl number should be reset to 0 whenever the minor version number is
dnl incremented.  The micro version number must be a small integer
dnl number.

AC_SUBST(MICRO_VER)
MICRO_VER="1"

dnl The AC_PROG_CC line looks for a C compiler, and if gcc is chosen,
dnl sets the $GCC shell variable to "yes". Make sure that CFLAGS is
dnl set to something first, to prevent AC_PROG_CC from substituting -g
dnl for the optimization level.

CFLAGS="$CFLAGS"
AC_PROG_CC

dnl Apparently not all implementations of the 'make' command define
dnl the MAKE variable. The following directive creates a variable
dnl called SET_MAKE which when expanded in a makefile is either empty
dnl if the local 'make' command was found to define the MAKE variable,
dnl or contains an assignment which will give the MAKE variable the
dnl value 'make'.

AC_PROG_MAKE_SET

dnl The following directive causes autoconf to see if symbolic links
dnl are supported on the current filesystem. If so, it sets the
dnl variable LN_S to "ln -s". Otherwise it sets LN_S to just "ln".
dnl This allows us to create symbolic links where possible, but falls
dnl back to creating hard links where symbolic links aren't available.

AC_PROG_LN_S

dnl The following macro searches for the best implementation of awk
dnl on the host system, and records it in the AWK shell variable.

AC_PROG_AWK

dnl If ranlib is needed on the target system, the RANLIB make variable
dnl is set to ranlib. Otherwise it is set to :, which is the do-nothing
dnl command of the bourne shell.
dnl Note that we do not use AC_PROG_RANLIB because (at least in
dnl autoconf 2.53) this does not check for cross-compilation.

AC_CHECK_TOOL(RANLIB, ranlib)

dnl Set LD as appropriate, especially when cross-compiling

AC_CHECK_TOOL(LD, ld)

dnl The following directive tells autoconf to figure out the target
dnl system type and assign a canonical name for this to the $target
dnl shell variable. This is used below in the target-specific case
dnl statement.

AC_CANONICAL_SYSTEM

dnl In early versions of Solaris, some libraries are in /usr/ccs/lib,
dnl where gcc doesn't look. The tests below for the curses library
dnl would thus fail without this directory being added to the search
dnl path. We thus add it here before the tests. Note that in the
dnl following, since [ and ] are m4 quotes, and m4 will remove the
dnl outermost quotes when it processes this file, we have to double
dnl them up here to get [0-6] to appear in the output configure
dnl script.

case $target_os in
solaris2.[[0-6]]|solaris2.[[0-6]].*)
  LIBS="$LIBS -L/usr/ccs/lib"
  ;;
esac

dnl Recent versions of gcc place /usr/local/include at the head of the
dnl system include-file search path. This causes problems when include
dnl files that have the same name as standard system include files are
dnl placed in this directory by third-party packages. To avoid this,
dnl move /usr/local/include to the end of the search path.

if test "$GCC"_ = "yes"_; then
  touch foo.c
  fix=`$CC -E -Wp,-v foo.c 2>&1 | $AWK '
    /^#include <...> search starts here:/ {in_list=1;ndir=0}
    / *\// && in_list {path[[ndir++]] = $1}
    /^End of search list/ {in_list=0}
    END {
      if(path[[0]] ~ /\/usr\/local\/include/) {
        for(dir=1; dir<ndir; dir++) {
          printf(" -isystem %s", path[[dir]])
        }
        printf("\n");
      }
    }'`
  rm -f foo.c
  CFLAGS="$CFLAGS$fix"
fi

dnl The following lines look for terminfo functions in the normal
dnl curses library. If not found, they are searched for in the GNU
dnl ncurses library. If the terminfo functions still aren't found,
dnl then termcap functions are searched for in the curses library.  If
dnl either set of functions is found, the corresponding variable
dnl USE_TERMINFO or USE_TERMCAP is arranged to be defined in CFLAGS,
dnl via the exported DEFINES shell variable, and the library in which
dnl they were found is appended to the LIBS shell variable.

AC_CHECK_LIB(curses, tigetstr, [
  AC_DEFINE(USE_TERMINFO)
  LIBS="$LIBS -lcurses"
], [AC_CHECK_LIB(ncurses, tigetstr, [
  AC_DEFINE(USE_TERMINFO)
  LIBS="$LIBS -lncurses"
], [AC_CHECK_LIB(curses, tgetstr, [
  AC_DEFINE(USE_TERMCAP)
  LIBS="$LIBS -lcurses"
  AC_CHECK_HEADER(termcap.h, AC_DEFINE(HAVE_TERMCAP_H))
])])])

dnl Search for the curses.h and term.h header files, first in the
dnl standard system-include directories, and then if not found there,
dnl in any ncurses subdirectories of these directories. If found, have
dnl CFLAGS define C macros such as HAVE_TERM_H or HAVE_NCURSES_TERM_H.
dnl Note that on some systems trying to compile term.h without first
dnl including curses.h causes complaints, so when checking for term.h
dnl we tell AC_CHECK_HEADERS() to include curses.h in the test file
dnl that it attempts to compile.

AC_CHECK_HEADERS(curses.h, [AC_CHECK_HEADERS(term.h,[],[],[#include <curses.h>])], [AC_CHECK_HEADERS(ncurses/curses.h, [AC_CHECK_HEADERS(ncurses/term.h,[],[],[#include <ncurses/curses.h>])])])

dnl The following variable lists the targets that will be created if
dnl the user runs make without any arguments. Initially we assume
dnl that we can create both the normal and the reentrant versions
dnl of the library.

AC_SUBST(TARGETS)
TARGETS="normal reentrant"

dnl Check for reentrant functions by attempting to compile and link a
dnl temporary program which calls them, being sure to include the
dnl appropriate headers and define _POSIX_C_SOURCE, just in case any
dnl of the functions are defined as macros. In the following,
dnl AC_CACHE_CHECK outputs the message "checking for reentrant
dnl functions". If this check has been done before, it assigns the
dnl cached yes/no value to tecla_cv_reentrant.  Otherwise it uses
dnl AC_TRY_LINK() to attempt to compile and link the specified dummy
dnl program, and sets tecla_cv_reentrant to yes or no, depending on
dnl whether this succeeds. Finally it caches the value of
dnl tecla_cv_reentrant in the file config.cache, and writes "yes" or
dnl "no" to the terminal.

AC_CACHE_CHECK(for reentrant functions, tecla_cv_reentrant, [
  KEPT_CFLAGS="$CFLAGS"
  CFLAGS="$CFLAGS -D_POSIX_C_SOURCE=199506L"
  AC_TRY_LINK([
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <pwd.h>
  ], [
    (void) readdir_r(NULL, NULL, NULL);
    (void) getpwuid_r(geteuid(), NULL, NULL, 0, NULL);
    (void) getpwnam_r(NULL, NULL, NULL, 0, NULL);
  ], tecla_cv_reentrant=yes, tecla_cv_reentrant=no)
  CFLAGS="$KEPT_CFLAGS"
])

dnl If the necessary reentrant functions weren't found to be
dnl available, default to only compiling the non-reentrant version of
dnl the library.

if test $tecla_cv_reentrant = no; then
  TARGETS="normal"
fi

dnl If sys/select.h exists, arrange for the HAVE_SYS_SELECT_H C-macro to
dnl be defined when compiling the library.

AC_CHECK_HEADER(sys/select.h, AC_DEFINE(HAVE_SYS_SELECT_H))

dnl Check for the select system call with the normal arguments,
dnl by attempting to compile and link a temporary program which
dnl calls it, being sure to include the appropriate headers.
dnl In the following, AC_CACHE_CHECK outputs the message
dnl "checking for select system call". If this check has been done
dnl before, it assigns the cached yes/no value to tecla_cv_select.
dnl Otherwise it uses AC_TRY_LINK() to attempt to compile and link
dnl the specified dummy program, and sets tecla_cv_select to yes
dnl or no, depending on whether this succeeds. Finally it caches
dnl the value of tecla_cv_select in the file config.cache, and
dnl writes "yes" or "no" to the terminal.

AC_CACHE_CHECK(for select system call, tecla_cv_select, [
  AC_TRY_LINK([
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
  ], [
    fd_set fds;
    int nready;
    FD_ZERO(&fds);
    FD_SET(1, &fds);
    nready = select(2, &fds, &fds, &fds, NULL);
  ], tecla_cv_select=yes, tecla_cv_select=no)
])

dnl If the select function was available, arrange for HAVE_SELECT to
dnl be defined by CFLAGS.

if test $tecla_cv_select = yes; then
  AC_DEFINE(HAVE_SELECT)
fi

dnl Check if this system supports the system V pseudo terminal interface.

AC_CACHE_CHECK(for SysV pseudo-terminals, tecla_cv_sysv_pty, [
  AC_TRY_LINK([
#include <stdlib.h>
#include <unistd.h>
#include <stropts.h>
  ], [
    char *name = ptsname(0);
    int i1 = grantpt(0);
    int i2 = unlockpt(0);
    int i3 = ioctl(0, I_PUSH, "ptem");
    return 0;
  ], tecla_cv_sysv_pty=yes, tecla_cv_sysv_pty=no)
])

dnl If the system-V pseudo-terminal interface is available, arrange
dnl for HAVE_SYSV_PTY to be defined by CFLAGS.

if test $tecla_cv_sysv_pty = yes; then
  AC_DEFINE(HAVE_SYSV_PTY)
fi

dnl The following variable contains the extension to append to
dnl "libtecla" and "libtecla_r" when creating shared libraries on the
dnl target platform.  This is system dependent and is ignored if
dnl LINK_SHARED remains an empty string. On most platforms that
dnl support shared libaries, this will be .so.$MAJOR_VER, where
dnl MAJOR_VER is the major version number described above, which on
dnl some systems, tells the run-time loader if the program being
dnl loaded is binary compatible with a given version of the library
dnl (see the discussion of MAJOR_VER near the top of this file).
dnl The following empty default can be overriden on a system by system
dnl basis later in this file.

AC_SUBST(SHARED_EXT)
SHARED_EXT=""

dnl When a shared library is installed with the extension $SHARED_EXT,
dnl you can optionally produce other copies of this library with
dnl different extensions. This is done using symbolic or hard links,
dnl depending on what is available on the current filesystem, and the
dnl extensions to use for these links are listed in the following
dnl variable, separated by spaces. The following empty default can be
dnl overriden on a system by system basis later in this file.

AC_SUBST(SHARED_ALT)
SHARED_ALT=""

dnl The following variable lists extra compilation flags needed to
dnl create object files that can be included in shared libraries.
dnl Normally one would include a flag to tell the C compiler to
dnl compile position-independent code. This option commonly includes
dnl the acronym 'pic'.

AC_SUBST(SHARED_CFLAGS)
SHARED_CFLAGS=""

dnl On systems that support shared libraries, the following variable
dnl provides the command needed to make a shared library. In this
dnl variable, $$@ will be replaced with the name of the shared
dnl library, $$(LIB_OBJECTS) will be replaced with a space separated
dnl list of the object files that are to be included in the library,
dnl and libtecla$$(SUFFIX) will be the name of the library being
dnl built, minus the system-specific extension (eg. libtecla or
dnl libtecla_r).  If LINK_SHARED is left as an empty string, shared
dnl library creation will not attempted. If your system supports
dnl shared library creation, you should override the default value of
dnl this variable in the target-specific case statement later in this
dnl file.

AC_SUBST(LINK_SHARED)
LINK_SHARED=""

dnl When compiling the reentrant version of the library, the following
dnl compiler flags are presented to the compiler, in addition to those
dnl that are used when compiling the non-reentrant version of the
dnl library. The PREFER_REENTRANT macro is an internal libtecla macro
dnl whose presence reports when the reentrant version of the library
dnl is being compiled. This allows the code to determine when to
dnl disable features that can't portably be implemented reentrantly,
dnl such as username completion. The existence of the _POSIX_C_SOURCE
dnl macro can't be reliably used for this purpose, since some systems
dnl define it by default for all code.

AC_SUBST(DEFS_R)
DEFS_R="-D_POSIX_C_SOURCE=199506L -DPREFER_REENTRANT"

dnl For man pages relating to library features, the following two
dnl variables determine in which sub-directory of the top-level man
dnl directory the man pages should go, and what file-name extensions
dnl these files should have. On systems where the following defaults
dnl are not valid, the default values should be overriden in the
dnl target-specific case statement later in this file.

AC_SUBST(LIBR_MANDIR)
AC_SUBST(LIBR_MANEXT)
LIBR_MANDIR="man3"
LIBR_MANEXT="3"

dnl For man pages relating to library functions, the following two
dnl variables serve the same purpose as the previously described
dnl LIBR_MANDIR and LIBR_MANEXT variables.

AC_SUBST(FUNC_MANDIR)
AC_SUBST(FUNC_MANEXT)
FUNC_MANDIR="man3"
FUNC_MANEXT="3"

dnl For man pages relating to programs, the following two variables
dnl serve the same purpose as the previously described LIBR_MANDIR
dnl and LIBR_MANEXT variables.

AC_SUBST(PROG_MANDIR)
AC_SUBST(PROG_MANEXT)
PROG_MANDIR="man1"
PROG_MANEXT="1"

dnl For man pages on miscellaneous topics, the following two variables
dnl serve the same purpose as the previously described LIBR_MANDIR
dnl and LIBR_MANEXT variables.

AC_SUBST(MISC_MANDIR)
AC_SUBST(MISC_MANEXT)
MISC_MANDIR="man7"
MISC_MANEXT="7"

dnl For man pages relating to configuration files, the following two
dnl variables serve the same purpose as the previously described
dnl LIBR_MANDIR and LIBR_MANEXT variables.

AC_SUBST(FILE_MANDIR)
AC_SUBST(FILE_MANEXT)
FILE_MANDIR="man5"
FILE_MANEXT="5"

dnl If the application doesn't want the user to have access to the
dnl filesystem, it can remove all action functions that list, read or
dnl write files, by including the configuration argument
dnl --without-file-actions.

AC_ARG_WITH(file-actions, AC_HELP_STRING([--with-file-actions], [Should users of gl_get_line() have access to the filesystem (default=yes)]),
 AC_DEFINE(HIDE_FILE_SYSTEM), )

dnl If the target system either has no file-system, or file-system access
dnl isn't needed, libtecla can be made smaller by excluding all file and
dnl directory access code. This is done by adding the configuration
dnl argument --without-file-system.

AC_ARG_WITH(file-system, AC_HELP_STRING([--with-file-system], [Does the target have a filesystem (default=yes)]),
 AC_DEFINE(WITHOUT_FILE_SYSTEM), )

dnl The following bourne shell case statement is where system
dnl dependencies can be added.  In particular, if your system supports
dnl shared library creation, the following switch is the place to
dnl configure it. To do so you will first need to find out what target
dnl type was just assigned by the AC_CANONICAL_SYSTEM macro executed
dnl previously.  The target type of your current system can be
dnl determined by cd'ing to the top level directory of the tecla
dnl distribution, and typing the command "sh config.guess". This will
dnl report what autoconf thinks the system type is. Note that this
dnl will be very specific, so if you know that the configuration
dnl parameters that you are about to provide apply to different
dnl versions of the current system type, you can express this in the
dnl case statement by using a wild-card in place of the version
dnl number, or by using an | alternation to list one or more version
dnl names. Beware that autoconf uses [] as quote characters, so if you
dnl want to use a regexp character range like [a-z], you should write
dnl this as [[a-z]].

case $target in
*solaris*)
  AC_DEFINE(__EXTENSIONS__)
  SHARED_EXT=".so.${MAJOR_VER}"
  SHARED_ALT=".so"
  LINK_SHARED="$LD"' -G -M $$(srcdir)/libtecla.map -o $$@ -h $$(@F) -z defs -i $$(LIB_OBJECTS) $$(LIBS) -lc'
  SHARED_CFLAGS="-Kpic"
  case $CC in
  */cc|cc) SHARED_CFLAGS="$SHARED_CFLAGS -xstrconst" ;;
  esac
  case $target_cpu in
  sparc) SHARED_CFLAGS="$SHARED_CFLAGS -xregs=no%appl"
  esac
  case $target_os in
  solaris2.[[89]]*|solaris2.1[[0-9]]*)
    LIBR_MANEXT=3lib
    FUNC_MANEXT=3tecla
    LIBR_MANDIR=man$LIBR_MANEXT
    FUNC_MANDIR=man$FUNC_MANEXT
  esac
  MISC_MANDIR="man5"
  MISC_MANEXT="5"
  FILE_MANDIR="man4"
  FILE_MANEXT="4"
  ;;
*linux*)
  SHARED_EXT=".so.${MAJOR_VER}.${MINOR_VER}.${MICRO_VER}"
  SHARED_ALT=".so .so.${MAJOR_VER}"

dnl See if the installed version of Gnu ld accepts version scripts.

  AC_CACHE_CHECK([for --version-script in GNU ld], tecla_cv_gnu_ld_script, [
    if (echo 'void dummy(void) {return;}' > dummy.c; $CC -c -fpic dummy.c; \
         $LD -o dummy.so dummy.o -shared --version-script=$srcdir/libtecla.map) 1>&2 2>/dev/null; then
      tecla_cv_gnu_ld_script=yes
    else
      tecla_cv_gnu_ld_script=no
    fi
    rm -f dummy.c dummy.o dummy.so
  ])
  if test $tecla_cv_gnu_ld_script = yes; then
    VERSION_OPT='--version-script=$$(srcdir)/libtecla.map'
  else
    VERSION_OPT=''
  fi

  LINK_SHARED="$LD"' -o $$@ -soname libtecla$$(SUFFIX).so.'${MAJOR_VER}' -shared '$VERSION_OPT' $$(LIB_OBJECTS) $$(LIBS) -lc'
  SHARED_CFLAGS="-fpic"

dnl Reenable the inclusion of symbols which get undefined when POSIX_C_SOURCE
dnl is specified.

  CFLAGS="-D_SVID_SOURCE -D_BSD_SOURCE $CFLAGS"
  ;;
*hpux*)
  SHARED_EXT=".${MAJOR_VER}"
  SHARED_ALT=".sl"
  LINK_SHARED="$LD"' -b +h $$(@F) +k +vshlibunsats -o $$@ -c libtecla.map.opt $$(LIB_OBJECTS) $$(LIBS) -lc'
  SHARED_CFLAGS="+z"
  MISC_MANEXT=5
  FILE_MANEXT=4
  MISC_MANDIR=man$MISC_MANEXT
  FILE_MANDIR=man$FILE_MANEXT
  ;;
*darwin*)
  SHARED_EXT=".${MAJOR_VER}.${MINOR_VER}.${MICRO_VER}.dylib"
  SHARED_ALT=".dylib .${MAJOR_VER}.dylib"
  LINK_SHARED='$(CC) -o $$@ -dynamiclib -flat_namespace -undefined suppress -compatibility_version '${MAJOR_VER}.${MINOR_VER}' -current_version '${MAJOR_VER}.${MINOR_VER}.${MICRO_VER}' -install_name '${libdir}'/$$@ $$(LIB_OBJECTS)'
  SHARED_CFLAGS=""
  ;;
*dec-osf*)
  AC_DEFINE(_OSF_SOURCE)
  ;;
*freebsd*)
  SHARED_EXT=".so.${MAJOR_VER}"
  SHARED_ALT=".so"
  VERSION_OPT='--version-script=$$(srcdir)/libtecla.map'
  LINK_SHARED='ld -o $$@ -soname libtecla$$(SUFFIX).so.'${MAJOR_VER}' -shared '$VERSION_OPT' $$(LIB_OBJECTS) $$(LIBS) -lc'
  SHARED_CFLAGS="-fpic"
  ;;
mips-sgi-irix*)
  DEFS_R="$DEFS_R -D_XOPEN_SOURCE=500"
  if test "$RANLIB"_ = "_"; then
    RANLIB=":"
  fi
  ;;
esac

dnl The following statement checks to see if the GNU C compiler has
dnl been chosen instead of the normal compiler of the host operating
dnl system. If it has, and shared library creation has been
dnl configured, it replaces the shared-library-specific C compilation
dnl flags with those supported by gcc. Also append the gcc run-time
dnl library to the shared library link line.

if test "$GCC"_ = "yes"_ && test "$LINK_SHARED"_ != "_" ; then
  SHARED_CFLAGS="-fpic"
  case $target in
  sparc-*-solaris*)
    SHARED_CFLAGS="$SHARED_CFLAGS -mno-app-regs"
    ;;
  *darwin*)
    SHARED_CFLAGS=""
    ;;
  esac
  LINK_SHARED="$LINK_SHARED `gcc -print-libgcc-file-name`"
fi

dnl The following variable will list which types of libraries,
dnl "static", and possibly "shared", are to be created and installed.

AC_SUBST(TARGET_LIBS)

dnl If shared library creation has been configured, add shared
dnl libraries to the list of libraries to be built.

if test "$LINK_SHARED"_ != "_"; then
  TARGET_LIBS="static shared"
else
  TARGET_LIBS="static"
  LINK_SHARED="@:"
fi

dnl Set the shell variable and Makefile variable, MAKE_MAN_PAGES, to
dnl "yes" if man pages are desired. By default they are, but if the
dnl user specifies --with-man-pages=no or --without-man-pages, then
dnl they won't be preprocessed by the configure script or installed
dnl by the Makefile.

AC_SUBST(MAKE_MAN_PAGES)
AC_ARG_WITH(man-pages, AC_HELP_STRING([--with-man-pages], [Are man pages desired (default=yes)]),
 MAKE_MAN_PAGES="$withval", MAKE_MAN_PAGES="yes")

dnl Create the list of files to be generated by the configure script.

OUTPUT_FILES="Makefile"
rm -rf man/man*
if test "$MAKE_MAN_PAGES"_ = "yes"_; then
  for area in libr func misc prog file; do
    for page in man/$area/*.in; do
      OUTPUT_FILES="$OUTPUT_FILES `echo $page | sed 's/\.in$//'`"
    done
  done
fi

dnl The following directive must always be the last line of any
dnl autoconf script. It causes autoconf to create the configure
dnl script, which for each argument of AC_OUTPUT, will look for a
dnl filename formed by appending ".in" to the argument, preprocess
dnl that file, replacing @VAR@ directives with the corresponding value
dnl of the specified shell variable VAR, as set above in this file,
dnl and write the resulting output to the filename given in the
dnl argument. Note that only shell variables that were exported above
dnl with the AC_SUBST() directive will be substituted in @VAR@
dnl directives (some macros like AC_PROG_CC also call AC_SUBST for you
dnl for the variables that they output).

AC_OUTPUT($OUTPUT_FILES)