update arm tool chain

@@ -47,12 +47,15 @@ echo "" >> $SRS_AUTO_HEADERS_H
 # generate auto headers file, depends on the finished of options.sh
 #####################################################################################
 # the arm-ubuntu12 options for make for depends
-SrsArmCC="arm-linux-gnueabi-gcc"
-SrsArmGCC="arm-linux-gnueabi-gcc"
-SrsArmCXX="arm-linux-gnueabi-g++"
-SrsArmAR="arm-linux-gnueabi-ar"
-SrsArmLD="arm-linux-gnueabi-ld"
-SrsArmRANDLIB="arm-linux-gnueabi-ranlib"
+if [[ -z $SrsArmCC ]]; then SrsArmCC="arm-linux-gnueabi-gcc"; fi
+if [[ -z $SrsArmGCC ]]; then SrsArmGCC="arm-linux-gnueabi-gcc"; fi
+if [[ -z $SrsArmCXX ]]; then SrsArmCXX="arm-linux-gnueabi-g++"; fi
+if [[ -z $SrsArmAR ]]; then SrsArmAR="arm-linux-gnueabi-ar"; fi
+if [[ -z $SrsArmLD ]]; then SrsArmLD="arm-linux-gnueabi-ld"; fi
+if [[ -z $SrsArmRANDLIB ]]; then SrsArmRANDLIB="arm-linux-gnueabi-ranlib"; fi
+echo "cc=$SrsArmCC gcc=$SrsArmGCC g++=$SrsArmCXX ar=$SrsArmAR ld=$SrsArmLD randlib=$SrsArmRANDLIB"
+echo "#define SRS_ARM_TOOL_CHAIN \"cc=$SrsArmCC gcc=$SrsArmGCC g++=$SrsArmCXX ar=$SrsArmAR ld=$SrsArmLD randlib=$SrsArmRANDLIB\"" >> $SRS_AUTO_HEADERS_H
+echo "" >> $SRS_AUTO_HEADERS_H
 
 # apply user options.
 . auto/depends.sh

@@ -161,6 +161,9 @@ int main(int argc, char** argv)
     srs_trace("uname: "SRS_UNAME);
     srs_trace("build: %s, %s", SRS_BUILD_DATE, srs_is_little_endian()? "little-endian":"big-endian");
     srs_trace("configure: "SRS_CONFIGURE);
+#ifdef SRS_ARM_UBUNTU12
+    srs_trace("arm tool chain: "SRS_ARM_TOOL_CHAIN);
+#endif
     
     if ((ret = _srs_server->initialize()) != ERROR_SUCCESS) {
         return ret;