Add arm-linux-gnu cross-compiler support

(No support for selecting include and library path yet)

config.arm-linux-gnu.mk

@@ -0,0 +1,23 @@
+#******************************************************************************
+# config.arm-linux-gnu.mk                                        Build project 
+#******************************************************************************
+#
+#  File Description:
+#
+#    Compilation profile for arm-linux-gnu
+#
+#
+#
+#
+#
+#
+#
+#
+#******************************************************************************
+# (C) 2017 Christophe de Dinechin <christophe@dinechin.org>
+#This software is licensed under the GNU General Public License v3
+#See file COPYING for details.
+#******************************************************************************
+
+CROSS_COMPILE=arm-linux-gnu
+include $(BUILD)config.gnu.mk

config.gnu.mk

@@ -22,13 +22,13 @@
 #  Tools
 #------------------------------------------------------------------------------
 
-CC=             gcc
-CXX=            g++
+CC=             $(CROSS_COMPILE:%=%-)gcc
+CXX=            $(CROSS_COMPILE:%=%-)g++
 LD=             $(CXX)
 CPP=            $(CC) -E
 PYTHON=         python
-AR=             ar -rcs
-RANLIB=         ranlib
+AR=             $(CROSS_COMPILE:%=%-)ar -rcs
+RANLIB=         $(CROSS_COMPILE:%=%-)ranlib
 LIBTOOL=        libtool -no_warning_for_no_symbols
 INSTALL=	install
 

hello.cpp

@@ -1,5 +1,9 @@
 #include "config.h"
+#if HAVE_IOSTREAM
 #include <iostream>
+#elif HAVE_STDIO_H
+#include <stdio.h>
+#endif // IO
 
 #if HAVE_SYS_IMPROBABLE_H
 #warning "Improbable header present, probably a fault in the build system"
@@ -11,5 +15,11 @@
 
 int main()
 {
+#if HAVE_IOSTREAM
     std::cout << "You successfully built using build\n";
+#elif HAVE_STDIO_H
+    printf("You successfully built using build (without iostream)\n");
+#else
+#warning "Building without <iostream> or <stdio.h>. Cross-compiling?"
+#endif // HAVE_IOSTREAM
 }

rules.mk

@@ -45,8 +45,8 @@ DIR:=           $(subst $(BASEDIR),,$(FULLDIR))
 PRETTY_DIR:=    $(subst $(BASEDIR),[top],$(FULLDIR))
 BASENAME_DIR:=  $(shell basename $(FULLDIR))
 BUILD_DATE:=    $(shell /bin/date '+%Y%m%d-%H%M%S')
-OBJROOT:=       $(BUILDOBJ)/$(BUILDENV)/$(TARGET)$(BASE_EXTRA_DEPTH)
-BUILD_LOG:=     $(BUILD_LOGS)build-$(BUILDENV)-$(TARGET)-$(BUILD_DATE).log
+OBJROOT:=       $(BUILDOBJ)/$(BUILDENV)/$(CROSS_COMPILE:%=%-)$(TARGET)$(BASE_EXTRA_DEPTH)
+BUILD_LOG:=     $(BUILD_LOGS)build-$(BUILDENV)-$(CROSS_COMPILE:%=%-)$(TARGET)-$(BUILD_DATE).log
 endif
 
 # Configuration variables