serval-dna/m4/ax_prog_swiftc.m4
Andrew Bettison f2eb2bf9ab Add Swift 3/4 'servaldswift' executable
If the Swift 3 or Swift 4 compiler is present or passed to the configure
script in the SWIFTC variable, then the Makefile will compile a Swift
'servaldswift' executable to ensure that the module map links correctly
into a stand-alone Swift program.

Use the gold linker if supported, to avoid relocation errors on symbols
produced by Swift when linking dynamic libraries.
2018-03-06 15:29:17 +10:30

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# Serval Project Swift language support
#
# SYNOPSIS
#
# AX_PROG_SWIFTC
#
# DESCRIPTION
#
# AX_PROG_SWIFTC tests for the presence of a Swift compiler.
#
# Sets the SWIFTC shell variable to the name of the Swift executable (not the
# Swift compiler!) either relative to $PATH or an absolute path if necessary;
# this is usually just "swiftc".
#
# To force a specific compiler, either:
#
# - in configure.ac, set SWIFTC=yourcompiler before calling AX_PROG_SWIFTC,
# or
#
# - before invoking ./configure, export SWIFTC=yourcompiler
#
# LICENSE
#
# Copyright (C) 2016 Flinders University
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
#
# As a special exception, the respective Autoconf Macro's copyright owner
# gives unlimited permission to copy, distribute and modify the configure
# scripts that are the output of Autoconf when processing the Macro. You
# need not follow the terms of the GNU General Public License when using
# or distributing such scripts, even though portions of the text of the
# Macro appear in them. The GNU General Public License (GPL) does govern
# all other use of the material that constitutes the Autoconf Macro.
#
# This special exception to the GPL applies to versions of the Autoconf
# Macro released by the Autoconf Archive. When you make and distribute a
# modified version of the Autoconf Macro, you may extend this special
# exception to the GPL to apply to your modified version as well.
AU_ALIAS([AC_PROG_SWIFTC], [AX_PROG_SWIFTC])
AC_DEFUN([AX_PROG_SWIFTC],[
test "x$SWIFTC" = x && AC_CHECK_PROGS(SWIFTC, swiftc)
AC_PROVIDE([$0])dnl
])