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+From c7c769990bca3049bc389dcbd9985adaec134946 Mon Sep 17 00:00:00 2001
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+From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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+Date: Sat, 29 Aug 2015 11:59:18 +0200
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+Subject: [PATCH] Use the native compiler to build generate_cookbook
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+
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+The generate_cookbook binary needs to be executed at build time. When
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+cross-compiling, this means that it should be built with the native
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+compiler rather than the cross-compiler.
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+
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+To achieve this, this commit imports the AX_CC_FOR_BUILD autoconf
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+macro from the GNU Autoconf Archive project, and adjusts
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+src/Makefile.am to use CC_FOR_BUILD to build generate_cookbook.
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+
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+Based on initial work by Bernd Kuhls.
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+
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+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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+---
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+ Makefile.am | 1 +
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+ configure.ac | 2 ++
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+ m4/ax_cc_for_build.m4 | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++
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+ src/Makefile.am | 3 ++
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+ 4 files changed, 83 insertions(+)
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+ create mode 100644 m4/ax_cc_for_build.m4
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+
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+diff --git a/Makefile.am b/Makefile.am
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+index 4468bca..bd3ce01 100644
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+--- a/Makefile.am
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++++ b/Makefile.am
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+@@ -2,6 +2,7 @@ AM_CFLAGS = -Isrc -fPIC -Wall -O3 -lm
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+ AUTOMAKE_OPTIONS = gnu
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+ NAME = codec2
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+ AM_CPPFLAGS = $(AM_CFLAGS)
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++ACLOCAL_AMFLAGS = -I m4
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+
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+ pkgconfigdir = $(libdir)/pkgconfig
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+ pkgconfig_DATA = codec2.pc
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+diff --git a/configure.ac b/configure.ac
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+index 493c517..7520af6 100644
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+--- a/configure.ac
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++++ b/configure.ac
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+@@ -4,10 +4,12 @@
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+ AC_PREREQ([2.59])
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+ AC_INIT(codec2, 0.2, david@rowetel.com)
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+ AM_INIT_AUTOMAKE
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++AC_CONFIG_MACRO_DIR([m4])
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+
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+ # Checks for programs.
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+ AC_PROG_CC
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+ AC_PROG_LIBTOOL
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++AX_CC_FOR_BUILD
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+
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+ # Checks for libraries.
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+ # FIXME: Replace `main' with a function in `-lm':
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+diff --git a/m4/ax_cc_for_build.m4 b/m4/ax_cc_for_build.m4
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+new file mode 100644
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+index 0000000..c880fd0
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+--- /dev/null
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++++ b/m4/ax_cc_for_build.m4
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+@@ -0,0 +1,77 @@
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++# ===========================================================================
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++# http://www.gnu.org/software/autoconf-archive/ax_cc_for_build.html
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++# ===========================================================================
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++#
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++# SYNOPSIS
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++#
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++# AX_CC_FOR_BUILD
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++#
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++# DESCRIPTION
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++#
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++# Find a build-time compiler. Sets CC_FOR_BUILD and EXEEXT_FOR_BUILD.
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++#
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++# LICENSE
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++#
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++# Copyright (c) 2010 Reuben Thomas <rrt@sc3d.org>
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++# Copyright (c) 1999 Richard Henderson <rth@redhat.com>
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++#
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++# This program is free software: you can redistribute it and/or modify it
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++# under the terms of the GNU General Public License as published by the
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++# Free Software Foundation, either version 3 of the License, or (at your
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++# option) any later version.
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++#
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++# This program is distributed in the hope that it will be useful, but
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++# WITHOUT ANY WARRANTY; without even the implied warranty of
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++# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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++# Public License for more details.
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++#
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++# You should have received a copy of the GNU General Public License along
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++# with this program. If not, see <http://www.gnu.org/licenses/>.
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++#
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++# As a special exception, the respective Autoconf Macro's copyright owner
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++# gives unlimited permission to copy, distribute and modify the configure
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++# scripts that are the output of Autoconf when processing the Macro. You
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++# need not follow the terms of the GNU General Public License when using
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++# or distributing such scripts, even though portions of the text of the
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++# Macro appear in them. The GNU General Public License (GPL) does govern
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++# all other use of the material that constitutes the Autoconf Macro.
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++#
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++# This special exception to the GPL applies to versions of the Autoconf
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++# Macro released by the Autoconf Archive. When you make and distribute a
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++# modified version of the Autoconf Macro, you may extend this special
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++# exception to the GPL to apply to your modified version as well.
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++
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++#serial 2
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++
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++dnl Get a default for CC_FOR_BUILD to put into Makefile.
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++AC_DEFUN([AX_CC_FOR_BUILD],
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++[# Put a plausible default for CC_FOR_BUILD in Makefile.
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++if test -z "$CC_FOR_BUILD"; then
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++ if test "x$cross_compiling" = "xno"; then
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++ CC_FOR_BUILD='$(CC)'
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++ else
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++ CC_FOR_BUILD=gcc
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++ fi
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++fi
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++AC_SUBST(CC_FOR_BUILD)
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++# Also set EXEEXT_FOR_BUILD.
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++if test "x$cross_compiling" = "xno"; then
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++ EXEEXT_FOR_BUILD='$(EXEEXT)'
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++else
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++ AC_CACHE_CHECK([for build system executable suffix], bfd_cv_build_exeext,
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++ [rm -f conftest*
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++ echo 'int main () { return 0; }' > conftest.c
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++ bfd_cv_build_exeext=
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++ ${CC_FOR_BUILD} -o conftest conftest.c 1>&5 2>&5
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++ for file in conftest.*; do
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++ case $file in
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++ *.c | *.o | *.obj | *.ilk | *.pdb) ;;
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++ *) bfd_cv_build_exeext=`echo $file | sed -e s/conftest//` ;;
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++ esac
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++ done
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++ rm -f conftest*
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++ test x"${bfd_cv_build_exeext}" = x && bfd_cv_build_exeext=no])
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++ EXEEXT_FOR_BUILD=""
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++ test x"${bfd_cv_build_exeext}" != xno && EXEEXT_FOR_BUILD=${bfd_cv_build_exeext}
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++fi
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++AC_SUBST(EXEEXT_FOR_BUILD)])dnl
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+diff --git a/src/Makefile.am b/src/Makefile.am
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+index 1153b3c..719088d 100644
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+--- a/src/Makefile.am
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++++ b/src/Makefile.am
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+@@ -77,6 +77,9 @@ CODEBOOKSGE= \
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+
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+ noinst_PROGRAMS = generate_codebook genlspdtcb
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+
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++generate_codebook$(EXEEXT_FOR_BUILD): generate_codebook.c
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++ $(CC_FOR_BUILD) -o $@ generate_codebook.c -lm
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++
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+ codebook.$(OBJEXT): codebook.c
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+ codebookd.$(OBJEXT): codebookd.c
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+ codebookdt.$(OBJEXT): codebookdt.c
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+--
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+2.5.0
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+
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Bernd Kuhls