From 06834930632cc2997f3cea770fa7a8931f3fa5ed Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Diego=20Elio=20Petten=C3=B2?= <flameeyes@gmail.com>
Date: Tue, 8 Feb 2011 16:41:18 +0100
Subject: build-sys: make libatasmart easily cross-compilable

Pick up the AX_CC_FOR_BUILD macro from autoconf-archive (improved, going to
be sent there soon), then use that one to find the host's compiler.

Build the strpool in a different directory, since you cannot override CC
and other variables on a per-target basis yet. While this adds recursivity
to the build system is the best hope you have to properly solve the
cross-compilation.

Update .gitignore accordingly to the above changes, and make sure
bootstrap.sh search macro files in the m4 directory.
---
 m4/ax_cc_for_build.m4 | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 m4/ax_cc_for_build.m4

(limited to 'm4')

diff --git a/m4/ax_cc_for_build.m4 b/m4/ax_cc_for_build.m4
new file mode 100644
index 0000000..822d422
--- /dev/null
+++ b/m4/ax_cc_for_build.m4
@@ -0,0 +1,105 @@
+# ===========================================================================
+#      http://www.gnu.org/software/autoconf-archive/ax_cc_for_build.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_CC_FOR_BUILD
+#
+# DESCRIPTION
+#
+#   Find a build-time compiler. Sets CC_FOR_BUILD and EXEEXT_FOR_BUILD.
+#
+# LICENSE
+#
+#   Copyright (c) 2010 Diego Elio Pettenò <flameeyes@gmail.com>
+#   Copyright (c) 2010 Reuben Thomas <rrt@sc3d.org>
+#   Copyright (c) 1999 Richard Henderson <rth@redhat.com>
+#
+#   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/>.
+#
+#   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.
+
+#serial 2
+
+dnl Get a default for CC_FOR_BUILD to put into Makefile.
+AC_DEFUN([AX_CC_FOR_BUILD], [
+  AC_REQUIRE([AC_PROG_CC])
+
+  dnl Declare the new variables
+  AC_ARG_VAR([CC_FOR_BUILD],
+     [Host's C compiler command for cross-compilation @<:@default=$(CC)@:>@])
+  AC_ARG_VAR([BUILD_CFLAGS],
+     [Host's C compiler flags @<:@default=$(CFLAGS)@:>@])
+  AC_ARG_VAR([BUILD_LDFLAGS],
+     [Host's linker flags @<:@default=$(LDFLAGS)@:>@])
+
+  dnl Put a plausible default for CC_FOR_BUILD in Makefile.
+  if test -z "$CC_FOR_BUILD"; then
+    if test "x$cross_compiling" = "xno"; then
+      CC_FOR_BUILD=${CC}
+    else
+      AC_CHECK_PROGS(CC_FOR_BUILD, [gcc cc])
+    fi
+  fi
+
+  if test "x${BUILD_CFLAGS+set}" != "xset" ; then
+    if test "x$cross_compiling" = "xyes" ; then
+      BUILD_CFLAGS=
+    else
+      BUILD_CFLAGS=${CFLAGS}
+    fi
+  fi
+
+  if test "x${BUILD_LDFLAGS+set}" != "xset" ; then
+    if test "x$cross_compiling" = "xyes" ; then
+      BUILD_LDFLAGS=
+    else
+      BUILD_LDFLAGS=${LDFLAGS}
+    fi
+  fi
+
+  dnl Also set EXEEXT_FOR_BUILD.
+  if test "x$cross_compiling" = "xno"; then
+    EXEEXT_FOR_BUILD='$(EXEEXT)'
+  else
+    AC_CACHE_CHECK([for build system executable suffix], bfd_cv_build_exeext,
+      [rm -f conftest*
+       echo 'int main () { return 0; }' > conftest.c
+       bfd_cv_build_exeext=
+       ${CC_FOR_BUILD} ${LDFLAGS} ${CFLAGS} -o conftest conftest.c 1>&5 2>&5
+       for file in conftest.*; do
+         case $file in
+         *.c | *.o | *.obj | *.ilk | *.pdb) ;;
+         *) bfd_cv_build_exeext=`echo $file | sed -e s/conftest//` ;;
+         esac
+       done
+       rm -f conftest*
+       test x"${bfd_cv_build_exeext}" = x && bfd_cv_build_exeext=no])
+    EXEEXT_FOR_BUILD=""
+    test x"${bfd_cv_build_exeext}" != xno && EXEEXT_FOR_BUILD=${bfd_cv_build_exeext}
+  fi
+  AC_SUBST(EXEEXT_FOR_BUILD)
+])dnl
-- 
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