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# Copyright (C) 2011-2025 Simon Josefsson
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
AC_INIT([Libidn2],
m4_esyscmd([build-aux/git-version-gen .tarball-version]),
[help-libidn@gnu.org],,
[https://www.gnu.org/software/libidn/#libidn2])
# Library code modified: REVISION++
# Interfaces changed/added/removed: CURRENT++ REVISION=0
# Interfaces added: AGE++
# Interfaces removed: AGE=0
AC_SUBST(LT_CURRENT, 4)
AC_SUBST(LT_REVISION, 0)
AC_SUBST(LT_AGE, 4)
DLL_VERSION=`expr ${LT_CURRENT} - ${LT_AGE}`
AC_SUBST(DLL_VERSION)
AC_SUBST([MAJOR_VERSION], [`echo $PACKAGE_VERSION|cut -d'.' -f1`])
AC_SUBST([MINOR_VERSION], [`echo $PACKAGE_VERSION|cut -d'.' -f2`])
AC_SUBST([PATCH_VERSION], [`echo $PACKAGE_VERSION|cut -d'.' -f3`])
AC_SUBST([NUMBER_VERSION], [`printf '0x%02x%02x%04x' $MAJOR_VERSION $MINOR_VERSION $PATCH_VERSION`])
AC_MSG_NOTICE([$PACKAGE_NAME $PACKAGE_VERSION $PACKAGE_TARNAME $MAJOR_VERSION.$MINOR_VERSION.$PATCH_VERSION $NUMBER_VERSION $LT_CURRENT:$LT_REVISION:$LT_AGE $DLL_VERSION])
AC_CONFIG_AUX_DIR([build-aux])
AC_CONFIG_MACRO_DIRS([m4 gl/m4 unistring/m4])
AC_CONFIG_HEADERS([config.h])
AM_INIT_AUTOMAKE([1.14 tar-ustar -Wall -Wno-portability subdir-objects])
AM_SILENT_RULES([yes])
AC_PROG_CC
AC_USE_SYSTEM_EXTENSIONS
gl_EARLY
unistring_EARLY
AM_MISSING_PROG(HELP2MAN, help2man, $missing_dir)
LT_INIT([win32-dll])
gl_INIT
unistring_INIT
AC_DEFINE([GNULIB_NO_VLA], 1, [Disable VLA usage in gettext.h.])
# Detect the target system
case "${host_os}" in
linux-gnu)
build_linux_gnu=yes
esac
AM_CONDITIONAL([TEST_GLIBC], [test "$build_linux_gnu" = "yes"])
dnl Ideally, this should attempt a link, but this requires a separate
dnl version file, so we only check for compiler support here.
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([
__attribute__((visibility("hidden")))
int
versioned_symbol_internal (void)
{
}
__typeof__ (versioned_symbol_internal) versioned_symbol
__attribute__ ((visibility ("default"),
alias ("versioned_symbol_internal")));
__asm__ (".symver versioned_symbol, versioned_symbol@IDN2_0.0.0");
])], [AC_DEFINE([HAVE_SYMVER_ALIAS_SUPPORT], [1],
[The toolchain supports aliases and .symver.])])
#
# check for gtk-doc
#
m4_ifdef([GTK_DOC_CHECK], [
GTK_DOC_CHECK([1.14],[--flavour no-tmpl])
],[
AM_CONDITIONAL([ENABLE_GTK_DOC], false)
])
# needed for some older versions of gtk-doc
m4_ifdef([GTK_DOC_USE_LIBTOOL], [], [
AM_CONDITIONAL([GTK_DOC_USE_LIBTOOL], false)
])
AM_GNU_GETTEXT([external])
AM_GNU_GETTEXT_VERSION([0.19.8])
AX_CODE_COVERAGE
AC_ARG_ENABLE([gcc-warnings],
[AS_HELP_STRING([[--enable-gcc-warnings[=TYPE]]],
[control generation of GCC warnings. The TYPE 'no' disables
warnings; 'yes' (default) generates cheap warnings;
'expensive' in addition generates expensive warnings
and 'error' also turn warnings into errors.])])
# https://www.gnu.org/software/gnulib//manual/html_node/manywarnings.html
AS_IF([test "$enable_gcc_warnings" != no],
[
# Set up the list of unwanted warning options.
nw=
if test "$enable_gcc_warnings" = yes; then
nw="$nw -fanalyzer"
fi
nw="$nw -Wbad-function-cast" # Casting a function's result is not more
# dangerous than casting any other value.
nw="$nw -Winline" # It's OK to not inline.
nw="$nw -Wsign-compare" # Too many false alarms.
nw="$nw -Wstrict-overflow" # It's OK to optimize strictly.
nw="$nw -Wsystem-headers" # Don't warn in system headers.
# https://github.com/pi-hole/FTL/pull/1428
nw="$nw -Wsuggest-attribute=pure"
nw="$nw -Wsuggest-attribute=const"
dnl nw="$nw -Wundef" # All compiler preprocessors support #if UNDEF
dnl nw="$nw -Wtraditional" # All compilers nowadays support ANSI C
dnl nw="$nw -Wconversion" # These warnings usually don't point to mistakes.
dnl nw="$nw -Wpadded" # Padding internal structs doesn't help.
dnl nw="$nw -Wc++-compat" # Compile using a C compiler.
dnl nw="$nw -Wtraditional-conversion" # Too many complaints for now.
dnl nw="$nw -Wunreachable-code" # gcc bug 40412
dnl nw="$nw -Wswitch-default" # Nothing wrong with default-less switch?
dnl nw="$nw -Wmissing-field-initializers" # Avoid spamming in tests/ directory
dnl gl_WARN_ADD([-fdiagnostics-show-option])
dnl gl_WARN_ADD([-fdiagnostics-color=always]) # colors even when using ccache
if test "$enable_gcc_warnings" = error; then
gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
gl_WARN_ADD([-Wno-error=analyzer-use-of-uninitialized-value], [WERROR_CFLAGS])
gl_WARN_ADD([-Wno-error=missing-field-initializers], [WERROR_TESTS_CFLAGS])
# GCC 11.4 false positive: test-glib.c: double-'free' of 'naemchen_bytes' [-Werror=analyzer-double-free]
gl_WARN_ADD([-Wno-error=analyzer-double-free], [WERROR_TESTS_CFLAGS])
fi
# Setup the list of meaningful warning options for the C compiler.
# The list comes from manywarnings.m4. Warning options that are not
# generally meaningful have already been filtered out (cf.
# build-aux/gcc-warning.spec).
gl_MANYWARN_ALL_GCC([possible_warning_options])
# Compute the list of warning options that are desired.
gl_MANYWARN_COMPLEMENT([desired_warning_options],
[$possible_warning_options], [$nw])
# Compute the list of remaining undesired warning options.
# Namely those, that were not in manywarnings.m4 because they were
# already listed in build-aux/gcc-warning.spec; this includes those
# that are implied by -Wall.
gl_MANYWARN_COMPLEMENT([remaining_undesired_warning_options],
[$nw], [$possible_warning_options])
# Add the desired warning options to WARN_CFLAGS.
for w in $desired_warning_options; do
gl_WARN_ADD([$w])
done
# Add the opposites of the remaining undesired warning options to
# WARN_CFLAGS.
for w in `echo "$remaining_undesired_warning_options" | sed -e 's/-W/-Wno-/g'`; do
gl_WARN_ADD([$w])
done
])
AC_ARG_ENABLE(doc,
AS_HELP_STRING([--disable-doc], [don't generate any documentation]),
enable_doc=$enableval, enable_doc=yes)
AM_CONDITIONAL(ENABLE_DOC, test "$enable_doc" != "no")
if test "$enable_doc" = "yes";then
AC_CONFIG_FILES([
doc/Makefile
doc/reference/Makefile
doc/reference/version.xml
])
fi
AC_CONFIG_FILES([
Makefile
examples/Makefile
lib/idn2.h
lib/Makefile
unistring/Makefile
gl/Makefile
libidn2.pc
po/Makefile.in
src/Makefile
tests/Makefile
fuzz/Makefile
])
gl_CONFIG_VERSION_STAMP
AC_OUTPUT
AC_MSG_NOTICE([summary of main build options:
Version: ${VERSION}
Libtool version $LT_CURRENT:$LT_REVISION:$LT_AGE
DLL version: $DLL_VERSION
Header version: major $MAJOR_VERSION minor $MINOR_VERSION patch $PATCH_VERSION number $NUMBER_VERSION
Build system: ${build}
Host/Target system: ${host}
Install prefix: ${prefix}
Compiler: ${CC}
CFLAGS: ${CFLAGS}
CPPFLAGS: ${CPPFLAGS}
LDFLAGS: ${LDFLAGS}
Library types: Shared=${enable_shared}, Static=${enable_static}
Warning flags: $enable_gcc_warnings
WERROR_CFLAGS: $WERROR_CFLAGS
WERROR_TESTS_CFLAGS: $WERROR_TESTS_CFLAGS
WARN_CFLAGS: $WARN_CFLAGS
Documentation: ${enable_doc}
nl_langinfo: $am_cv_langinfo_codeset
Libiconv: $am_cv_func_iconv_summary
LTLIBICONV: $LTLIBICONV
Libunistring: $ac_cv_libunistring
VERSION: $LIBUNISTRING_VERSION
LTLIBUNISTRING: $LTLIBUNISTRING
Version script: $have_ld_version_script
Valgrind: $gl_cv_prog_valgrind_works $VALGRIND_PROGRAM $DEFAULT_VALGRINDFLAGS $VALGRINDFLAGS
])
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