elftosb: fix build forcing g++ compiler

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/elftosb/elftosb10.12.01-force_cxx_compiler.patch

@@ -0,0 +1,98 @@
+Subject: [PATCH 1/1] elftosb: force host C++ compiler
+
+Because Freescale provides *.cpp sources and elftosb links again libstdc++,
+force to use the host c++ compiler.
+
+This patch avoids the following error occurs:
+
+gcc AESKey.o Blob.o crc.o DataSource.o DataTarget.o ELFSourceFile.o EncoreBootImage.o EvalContext.o GHSSecInfo.o GlobMatcher.o HexValues.o Logging.o Operation.o OptionDictionary.o options.o OutputSection.o Random.o RijndaelCBCMAC.o rijndael.o SHA1.o SourceFile.o SRecordSourceFile.o stdafx.o StELFFile.o StExecutableImage.o StSRecordFile.o Value.o Version.o format_string.o ExcludesListMatcher.o SearchPath.o DataSourceImager.o IVTDataSource.o BootImageGenerator.o ConversionController.o ElftosbAST.o elftosb.o elftosb_lexer.o ElftosbLexer.o elftosb_parser.tab.o EncoreBootImageGenerator.o -lstdc++ -o elftosb
+/usr/bin/ld: ElftosbAST.o: undefined reference to symbol 'powf@@GLIBC_2.2.5'
+/usr/bin/ld: note: 'powf@@GLIBC_2.2.5' is defined in DSO /lib64/libm.so.6 so try adding it to the linker command line
+/lib64/libm.so.6: could not read symbols: Invalid operation
+collect2: error: ld returned 1 exit status
+
+When compiling with gcc and linking against libstdc++, ld uses libc instead of
+libstdc++.
+However, libc does not provide all functions libstdc++ does.
+Indeed, maths functions are provided by libm, not libc.
+Thus, elftosb should either:
+- use gcc and link against libc and libm;
+- or use g++ and link against libstdc++.
+
+Because elftosb is written in C++, this patch implement the sencond option, using
+g++ and linking against libstdc++.
+
+Signed-off-by: Samuel Martin <s.martin49@gmail.com>
+
+---
+Index: host-elftosb-10.12.01/makefile.rules
+===================================================================
+--- host-elftosb-10.12.01.orig/makefile.rules	2012-06-09 21:12:23.557526100 +0200
++++ host-elftosb-10.12.01/makefile.rules	2012-06-09 21:15:21.659894571 +0200
+@@ -15,6 +15,8 @@
+ # UNAMES is going to be set to either "Linux" or "CYGWIN_NT-5.1"
+ UNAMES = $(shell uname -s)
+
++CXX ?= g++
++
+ #*******************************************************************************
+ #                               Directories
+
+@@ -37,9 +39,9 @@
+ #*******************************************************************************
+ #                               Build flags
+-# gcc Compiler flags
++# Compiler flags
+ #    -g						: Produce debugging information.
+
+-CFLAGS	    = -g $(INC_PATH) -D${UNAMES}
++CXXFLAGS	= -g $(INC_PATH) -D${UNAMES}
+
+ #*******************************************************************************
+ #                               File lists
+@@ -137,13 +139,13 @@ clean:
+ 		${EXEC_FILE_ELFTOSB2} ${EXEC_FILE_SBTOOL} ${EXEC_FILE_KEYGEN}
+
+ elftosb: ${OBJ_FILES_ELFTOSB2}
+-	gcc ${OBJ_FILES_ELFTOSB2} ${LIBS} -o ${EXEC_FILE_ELFTOSB2}
++	$(CXX) ${OBJ_FILES_ELFTOSB2} ${LIBS} -o ${EXEC_FILE_ELFTOSB2}
+
+ sbtool: ${OBJ_FILES_SBTOOL}
+-	gcc ${OBJ_FILES_SBTOOL} ${LIBS} -o ${EXEC_FILE_SBTOOL}
++	$(CXX) ${OBJ_FILES_SBTOOL} ${LIBS} -o ${EXEC_FILE_SBTOOL}
+
+ keygen: ${OBJ_FILES_KEYGEN}
+-	gcc ${OBJ_FILES_KEYGEN} ${LIBS} -o ${EXEC_FILE_KEYGEN}
++	$(CXX) ${OBJ_FILES_KEYGEN} ${LIBS} -o ${EXEC_FILE_KEYGEN}
+
+
+ #ifeq ("${UNAMES}", "Linux")
+@@ -153,10 +155,10 @@ keygen: ${OBJ_FILES_KEYGEN}
+ .SUFFIXES : .c .cpp
+
+ .c.o :
+-	gcc ${CFLAGS} -c $<
++	$(CC) ${CXXFLAGS} -c $<
+
+ .cpp.o :
+-	gcc ${CFLAGS} -c $<
++	$(CXX) ${CXXFLAGS} -c $<
+
+ #endif
+
+@@ -165,13 +167,13 @@ keygen: ${OBJ_FILES_KEYGEN}
+
+ %.d: %.c
+ 	@set -e; \
+-	$(CC) -MM $(CFLAGS) $< | \
++	$(CC) -MM $(CXXFLAGS) $< | \
+ 	sed 's/\($*\)\.o[ :]*/\1.o $@ : /g' > $@; \
+ 	[ -s $@ ]  || rm -f $@
+
+ %.d: %.cpp
+ 	@set -e; \
+-	$(CC) -MM $(CFLAGS) $< | \
++	$(CXX) -MM $(CXXFLAGS) $< | \
+ 	sed 's/\($*\)\.o[ :]*/\1.o $@ : /g' > $@; \
+ 	[ -s $@ ]  || rm -f $@
+