experimental makefile for eventual Linux port (not currently functional);

dummy stdafx.h added to Common/Include for GCC build

Common/Include/stdafx.h

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+// dummy stdafx.h file for Linux version
+
+// In the Windows build, there are several stdafx.h files which are used for project-specific precompilation of headers.
+// In Linux, this is not used. By placing this dummy file ahead of all other stdafx.h in the include search path,
+// we make sure it compiles while not getting confused by Windows-specific content of those files.

makefile

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+# WORK IN PROGRESS, not currently complete nor usable
+
+# makefile for a Linux/GCC build of CNTK
+# This needs ACML_PATH. E.g. in tcsh, say: setenv ACML_PATH C:/AMD/acml5.3.1/ifort64_mp
+
+# This is work in progress and not at all complete or usable.
+#
+# The Linux and Windows versions are not different branches, but rather build off the same
+# source files, using different makefiles. This current makefile has the purpose of enabling
+# work to make all sources compile with GCC, and also to check for GCC-compat regressions due to
+# modifications which are currently done under Windows.
+#
+# The planned steps are:
+#  - runnable non-GPU GCC-built version under Cygwin
+#     - get all CPU-only sources to compile with GCC/x64 under Cygwin    --currently ongoing work
+#     - port the dynamic-loading mechanism
+#  - runnable non-GPU version on actual Linux
+#  - enable CUDA on Linux (=makefile code and figuring out the right compiler options)
+#
+# Any help is welcome, of course!
+#
+# This makefile will be extended/completed as we go.
+
+.SUFFIXES: 
+
+#SRC := Common/File.cpp Math/Math/Matrix.cpp
+#OBJ := $(SRC:%.cpp=%.obj)
+#DEP := $(OBJ:%.obj=%.dep)
+
+INCFLAGS = -I Common/Include -I Math/Math -I $(ACML_PATH)/include
+
+COMMON_SRC = Common/fileutil.cpp Common/DataWriter.cpp Common/ConfigFile.cpp Common/DataReader.cpp \
+             Common/Eval.cpp Common/File.cpp Common/NetworkDescriptionLanguage.cpp Common/BestGpu.cpp
+
+MATH_SRC = Math/Math/Matrix.obj Math/Math/CPUMatrix.obj Math/Math/CPUSparseMatrix.obj Math/Math/GPUDummy.obj
+
+SRC = $(MATH_SRC) $(COMMON_SRC)
+
+all:	${SRC:.cpp=.obj}
+
+
+CFLAGS = -std=c++0x -std=c++11 -DCPUONLY -D_POSIX_SOURCE -D_XOPEN_SOURCE=600 -fpermissive
+
+%.obj:	%.cpp
+	gcc -c -o $@ $(CPPFLAGS) $(CFLAGS) $(INCFLAGS) -MD -MP -MF ${@:.obj=.dep} $<
+
+# .dep files created by -MD option in the gcc call
+-include $(DEP)