Re: c and C++ source files in one makefile

[John Calcote]

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Rupal,

Once you've compiled C or C++ source files in to object files, the
linker can't really tell the difference between them - they're both
object files. The only differences will (probably) be the export
signatures - that is, C++ symbols will be exported in the usual C++
mangled form, while C symbols will be unmangled. But if you export
public symbols using "extern C", then there'll be even less differences
between the two.

BTW, I assume you're creating a SHARED library, and not a STATIC
library. To create a static library, you use the ar utility to just
combine object files into a static archive. To create a shared library,
you'd use the linker (ld) to link your object files together into a
shared object.

To build a shared object, just pass the "-shared" flag to the $(CXX)
tool (usually gcc). Also pass any additional libraries needed to resolve
symbols, and use the "-o" option to specify the output library name.

John

rupal.desai wrote:
> I need to make c or c++ source files into object files and then include both 
> for a library.  
> 
> Below is the way srcs and objects get defined.  How do get foo.o and bar.o to 
> combine to get the lib.
> 
> export SRCS = foo.cpp \
>               bar.c
> 
> .SUFFIXES: .cpp  .c
> 
> ifeq ($(firstword $(suffix $(SRCS))),.cpp)
> OBJS := $(addprefix $(OBJDIR)/, $(SRCS:.cpp=.o))
> else
> OBJS := $(addprefix $(OBJDIR)/, $(SRCS:.c=.o))
> endif
> 
> $(OBJDIR)/%.o: %.cpp
>     $(CXX) $(COPTS) $(OSDEFINES) $(EXTRA_DEFINES) $(INCLUDES) -o $@ -c $<
> 
> $(OBJDIR)/%.o: %.c
>     $(CC) $(COPTS) $(OSDEFINES) $(EXTRA_DEFINES) $(INCLUDES) -o $@ -c $<
> 
> $(SHARED_LIB): $(OBJS)
>     $(CXX) $(SHLDFLAGS) $(OBJS) $(LDFLAGS) $(LIBS) $(SYSLIBS) -o $(OBJDIR)/$@
>     $(CP) $(OBJDIR)/$@ $(PRJLIB)
> 
> Rupal Desai
> 
> 
> 
> 
> 
>        
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