[PATCH 1/2] support cross compilation

[Petr Ovtchenkov <ptr@void-ptr.info> (by way of Petr Ovtchenkov <ptr@void-ptr.info>)]

Possible problem with out-of-tree build expected
---
 Makefile.am          |  2 +-
 configure.ac         |  6 ++++++
 lib-host/Makefile.am | 47 ++++++++++++++++++++++++++++++++++++++++++++
 libcpu/Makefile.am   | 11 +++++++++++
 4 files changed, 65 insertions(+), 1 deletion(-)
 create mode 100644 lib-host/Makefile.am

diff --git a/Makefile.am b/Makefile.am
index 8643312a..a9c6c1d9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -26,7 +26,7 @@ AM_MAKEFLAGS = --no-print-directory
 
 pkginclude_HEADERS = version.h
 
-SUBDIRS = config lib libelf libcpu backends libebl libdwelf libdwfl libdw \
+SUBDIRS = config lib lib-host libelf libcpu backends libebl libdwelf libdwfl libdw \
 	  libasm debuginfod src po doc tests
 
 EXTRA_DIST = elfutils.spec GPG-KEY NOTES CONTRIBUTING \
diff --git a/configure.ac b/configure.ac
index 11d1cf82..d0ad4678 100644
--- a/configure.ac
+++ b/configure.ac
@@ -90,6 +90,7 @@ AH_TEMPLATE([USE_LOCKS], [Defined if libraries should be thread-safe.])
 
 AC_PROG_CC_C99
 AC_PROG_CXX
+AX_PROG_CC_FOR_BUILD
 AC_PROG_RANLIB
 AC_PROG_YACC
 AM_PROG_LEX
@@ -98,6 +99,8 @@ m4_ifdef([AM_PROG_AR], [AM_PROG_AR])
 AC_CHECK_TOOL([READELF], [readelf])
 AC_CHECK_TOOL([NM], [nm])
 
+AM_CONDITIONAL([CROSS], [test "x$cross_compiling" = xyes])
+
 AC_CACHE_CHECK([whether gcc supports __attribute__((visibility()))],
 	ac_cv_visibility, [dnl
 save_CFLAGS="$CFLAGS"
@@ -608,6 +611,9 @@ AC_CONFIG_FILES([doc/Makefile])
 dnl Support library.
 AC_CONFIG_FILES([lib/Makefile])
 
+dnl Support library.
+AC_CONFIG_FILES([lib-host/Makefile])
+
 dnl ELF library.
 AC_CONFIG_FILES([libelf/Makefile])
 
diff --git a/lib-host/Makefile.am b/lib-host/Makefile.am
new file mode 100644
index 00000000..9316c8ed
--- /dev/null
+++ b/lib-host/Makefile.am
@@ -0,0 +1,47 @@
+## Process this file with automake to create Makefile.in
+##
+## Copyright (C) 1996-2011 Red Hat, Inc.
+## This file is part of elfutils.
+##
+## This file is free software; you can redistribute it and/or modify
+## it under the terms of either
+##
+##   * the GNU Lesser General Public License as published by the Free
+##     Software Foundation; either version 3 of the License, or (at
+##     your option) any later version
+##
+## or
+##
+##   * 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
+##
+## or both in parallel, as here.
+##
+## elfutils 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 copies of the GNU General Public License and
+## the GNU Lesser General Public License along with this program.  If
+## not, see <http://www.gnu.org/licenses/>.
+##
+if CROSS
+
+include $(top_srcdir)/config/eu.am
+AM_CFLAGS += $(fpic_CFLAGS)
+AM_CPPFLAGS +=  -D_GNU_SOURCE -I$(srcdir)/../lib -I$(srcdir)/../libelf
+
+noinst_LIBRARIES = libeu.a
+
+$(libeu_a_OBJECTS):	CC=${CC_FOR_BUILD}
+
+libeu_a_SOURCES = ../lib/xstrdup.c ../lib/xstrndup.c ../lib/xmalloc.c ../lib/next_prime.c \
+		  ../lib/crc32.c ../lib/crc32_file.c \
+		  ../lib/color.c ../lib/printversion.c
+
+if !GPROF
+xmalloc_CFLAGS = -ffunction-sections
+endif
+endif
diff --git a/libcpu/Makefile.am b/libcpu/Makefile.am
index 57d0a164..8da743d4 100644
--- a/libcpu/Makefile.am
+++ b/libcpu/Makefile.am
@@ -27,6 +27,13 @@
 ## the GNU Lesser General Public License along with this program.  If
 ## not, see <http://www.gnu.org/licenses/>.
 ##
+
+if CROSS
+i386_gendis_LINK = ${CC_FOR_BUILD} ${LDFLAGS} -o $@
+
+$(i386_gendis_OBJECTS):	CC=${CC_FOR_BUILD}
+endif
+
 include $(top_srcdir)/config/eu.am
 AM_CPPFLAGS += -I$(srcdir)/../libelf -I$(srcdir)/../libebl \
 	    -I$(srcdir)/../libdw -I$(srcdir)/../libasm
@@ -87,7 +94,11 @@ endif
 
 i386_lex_no_Werror = yes
 
+if CROSS
+libeu = ../lib-host/libeu.a
+else
 libeu = ../lib/libeu.a
+endif
 
 i386_lex_CFLAGS = -Wno-unused-label -Wno-unused-function -Wno-sign-compare \
 		  -Wno-implicit-fallthrough
-- 
2.35.1.1.ge5a6898900