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# libunistring.m4 serial 13
dnl Copyright (C) 2009-2024 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
AC_PREREQ([2.64])
dnl gl_LIBUNISTRING
dnl Searches for an installed libunistring.
dnl If found, it sets and AC_SUBSTs HAVE_LIBUNISTRING=yes and the LIBUNISTRING
dnl and LTLIBUNISTRING variables, sets the LIBUNISTRING_VERSION variable, and
dnl augments the CPPFLAGS variable, and #defines HAVE_LIBUNISTRING to 1.
dnl Otherwise, it sets and AC_SUBSTs HAVE_LIBUNISTRING=no and LIBUNISTRING and
dnl LTLIBUNISTRING to empty.
dnl Define gl_LIBUNISTRING using AC_DEFUN_ONCE, in order dnl to avoid warnings
dnl like
dnl "warning: AC_REQUIRE: `gl_LIBUNISTRING' was expanded before it was required".
dnl This is tricky because of the way 'aclocal' is implemented:
dnl - It requires defining an auxiliary macro whose name ends in AC_DEFUN.
dnl Otherwise aclocal's initial scan pass would miss the macro definition.
dnl - It requires a line break inside the AC_DEFUN_ONCE and AC_DEFUN expansions.
dnl Otherwise aclocal would emit many "Use of uninitialized value $1"
dnl warnings.
AC_DEFUN_ONCE([gl_LIBUNISTRING],
[
AC_BEFORE([$0], [gl_LIBUNISTRING_MODULE])
AC_BEFORE([$0], [gl_LIBUNISTRING_LIBHEADER])
AC_BEFORE([$0], [gl_LIBUNISTRING_LIB_PREPARE])
m4_ifdef([gl_LIBUNISTRING_OPTIONAL],
[
AC_MSG_CHECKING([whether included libunistring is requested])
AC_ARG_WITH([included-libunistring],
[ --with-included-libunistring use the libunistring parts included here],
[gl_libunistring_force_included=$withval],
[gl_libunistring_force_included=no])
AC_MSG_RESULT([$gl_libunistring_force_included])
gl_libunistring_use_included="$gl_libunistring_force_included"
if test "$gl_libunistring_use_included" = yes; then
dnl Assume that libunistring is not installed until some other macro
dnl explicitly invokes gl_LIBUNISTRING_CORE.
if test -z "$HAVE_LIBUNISTRING"; then
HAVE_LIBUNISTRING=no
fi
LIBUNISTRING=
LTLIBUNISTRING=
else
gl_LIBUNISTRING_CORE
if test $HAVE_LIBUNISTRING = no; then
gl_libunistring_use_included=yes
LIBUNISTRING=
LTLIBUNISTRING=
fi
fi
],
[gl_LIBUNISTRING_CORE])
])
AC_DEFUN([gl_LIBUNISTRING_CORE],
[
AC_REQUIRE([AM_ICONV])
if test -n "$LIBICONV"; then
dnl First, try to link without -liconv. libunistring often depends on
dnl libiconv, but we don't know (and often don't need to know) where
dnl libiconv is installed.
AC_LIB_HAVE_LINKFLAGS([unistring], [],
[#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
[no, trying again together with libiconv])
if test "$ac_cv_libunistring" != yes; then
dnl Second try, with -liconv.
dnl We have to erase the cached result of the first AC_LIB_HAVE_LINKFLAGS
dnl invocation, otherwise the second one will not be run.
unset ac_cv_libunistring
glus_saved_LIBS="$LIBS"
LIBS="$LIBS $LIBICONV"
AC_LIB_HAVE_LINKFLAGS([unistring], [],
[#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
[no, consider installing GNU libunistring])
if test -n "$LIBUNISTRING"; then
LIBUNISTRING="$LIBUNISTRING $LIBICONV"
LTLIBUNISTRING="$LTLIBUNISTRING $LTLIBICONV"
fi
LIBS="$glus_saved_LIBS"
fi
else
AC_LIB_HAVE_LINKFLAGS([unistring], [],
[#include <uniconv.h>], [u8_strconv_from_locale((char*)0);],
[no, consider installing GNU libunistring])
fi
if test $HAVE_LIBUNISTRING = yes; then
dnl Determine the installed version.
AC_CACHE_CHECK([for libunistring version], [gl_cv_libunistring_version],
[AC_COMPUTE_INT([gl_libunistring_hexversion],
[_LIBUNISTRING_VERSION],
[#include <unistring/version.h>])
dnl Versions <= 0.9.3 had a hexversion of 0x0009.
dnl Use other tests to distinguish them.
if test $gl_libunistring_hexversion = 9; then
dnl Version 0.9.2 introduced the header <unistring/cdefs.h>.
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[#include <unistring/cdefs.h>]], [[]])],
[gl_cv_libunistring_version092=true],
[gl_cv_libunistring_version092=false])
if $gl_cv_libunistring_version092; then
dnl Version 0.9.3 changed a comment in <unistr.h>.
gl_ABSOLUTE_HEADER_ONE([unistr.h])
if test -n "$gl_cv_absolute_unistr_h" \
&& grep 'Copy no more than N units of SRC to DEST. Return a pointer' $gl_cv_absolute_unistr_h > /dev/null; then
dnl Detected version 0.9.3.
gl_libunistring_hexversion=2307
else
dnl Detected version 0.9.2.
gl_libunistring_hexversion=2306
fi
else
dnl Version 0.9.1 introduced the type casing_suffix_context_t.
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM(
[[#include <unicase.h>
casing_suffix_context_t ct;]],
[[]])],
[gl_cv_libunistring_version091=true],
[gl_cv_libunistring_version091=false])
if $gl_cv_libunistring_version091; then
dnl Detected version 0.9.1.
gl_libunistring_hexversion=2305
else
dnl Detected version 0.9.
gl_libunistring_hexversion=2304
fi
fi
fi
dnl Transform into the usual major.minor.subminor notation.
gl_libunistring_major=`expr $gl_libunistring_hexversion / 65536`
gl_libunistring_minor=`expr $gl_libunistring_hexversion / 256 % 256`
gl_libunistring_subminor=`expr $gl_libunistring_hexversion % 256`
gl_cv_libunistring_version="$gl_libunistring_major.$gl_libunistring_minor.$gl_libunistring_subminor"
])
LIBUNISTRING_VERSION="$gl_cv_libunistring_version"
fi
])
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