buildroot

Subject: [PATCH 1/1] elftosb: force host C++ compiler

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Because Freescale provides *.cpp sources and elftosb links again libstdc++,

force to use the host c++ compiler.

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This patch avoids the following error occurs:

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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

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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++.

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Because elftosb is written in C++, this patch implement the sencond option, using

g++ and linking against libstdc++.

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Signed-off-by: Samuel Martin <s.martin49@gmail.com>

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---

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}

​