#-----------------------------------------------------------------------------# # Makefile.DLLs, version 0.4. # Contributed by Fergus Henderson. # This Makefile contains rules for creating DLLs on Windows using gnu-win32. #-----------------------------------------------------------------------------# # This rule creates a `.def' file, which lists the symbols that are exported # from the DLL. We use `nm' to get a list of all the exported text (`T') # symbols and data symbols -- including uninitialized data (`B'), # initialized data (`D'), read-only data (`R'), and common blocks (`C'). %.def: %.a echo EXPORTS > $@ nm $< | grep '^........ [BCDRT] _' | sed 's/[^_]*_//' >> $@ # We need to use macros to access global data: # the user of the DLL must refer to `foo' as `(*__imp_foo)'. # This rule creates a `_globals.h' file, which contains macros # for doing this. SYM_PREFIX = $(firstword $(SYM_PREFIX-$*) $*) DLL_MACRO = $(SYM_PREFIX)_USE_DLL IMP_MACRO = $(SYM_PREFIX)_IMP GLOBAL_MACRO = $(SYM_PREFIX)_GLOBAL %_globals.h: %.a echo "/* automatically generated by Makefile.DLLs */" > $@ echo "#if defined(__GNUC__) && defined(_WIN32) \\" >> $@ echo " && defined($(DLL_MACRO))" >> $@ echo "# define $(IMP_MACRO)(name) __imp_##name" >> $@ echo "# define $(GLOBAL_MACRO)(name) (*$(IMP_MACRO)(name))" >> $@ echo "#else" >> $@ echo "# define $(GLOBAL_MACRO)(name) name" >> $@ echo "#endif" >> $@ echo "" >> $@ for sym in `nm $< | grep '^........ [BCDR] _' | sed 's/[^_]*_//'`; do \ echo "#define $$sym $(GLOBAL_MACRO)($$sym)" >> $@; \ done # This rule creates the export object file (`foo.exp') which contains the # jump table array; this export object file becomes part of the DLL. # This rule also creates the import library (`foo_dll.a') which contains small # stubs for all the functions exported by the DLL which jump to them via the # jump table. Executables that will use the DLL must be linked against this # stub library. %.exp %_dll.a : %.def dlltool $(DLLTOOLFLAGS) $(DLLTOOLFLAGS-$*) \ --def $< \ --dllname $*.dll \ --output-exp $*.exp \ --output-lib $*_dll.a # The `sed' commands below are to convert DOS-style `C:\foo\bar' # pathnames into Unix-style `//c/foo/bar' pathnames. CYGWIN32_LIBS = $(shell echo \ -L`dirname \`gcc -print-file-name=libgcc.a | \ sed -e 's@^\\\\([A-Za-z]\\\\):@//\\\\1@g' -e 's@\\\\\\\\@/@g' \` ` \ -L`dirname \`gcc -print-file-name=libcygwin.a | \ sed -e 's@^\\\\([A-Za-z]\\\\):@//\\\\1@g' -e 's@\\\\\\\\@/@g' \` ` \ -L`dirname \`gcc -print-file-name=libkernel32.a | \ sed -e 's@^\\\\([A-Za-z]\\\\):@//\\\\1@g' -e 's@\\\\\\\\@/@g' \` ` \ -lgcc -lcygwin -lkernel32 -lgcc) RELOCATABLE=yes ifeq "$(strip $(RELOCATABLE))" "yes" # to create relocatable DLLs, we need to do two passes %.dll: %.exp %.a dll_fixup.o dll_init.o $(LD) $(LDFLAGS) $(LDFLAGS-$*) --dll -o $*.base \ -e _dll_entry@12 dll_init.o \ dll_fixup.o $*.exp $*.a \ $(LDLIBS) $(LDLIBS-$*) \ $(CYGWIN32_LIBS) $(LD) $(LDFLAGS) $(LDFLAGS-$*) --dll --base-file $*.base -o $@ \ -e _dll_entry@12 dll_init.o \ dll_fixup.o $*.exp $*.a \ $(LDLIBS) $(LDLIBS-$*) \ $(CYGWIN32_LIBS) rm -f $*.base else %.dll: %.exp %.a dll_fixup.o dll_init.o $(LD) $(LDFLAGS) $(LDFLAGS-$*) --dll -o $@ \ -e _dll_entry@12 dll_init.o \ dll_fixup.o $*.exp $*.a \ $(LDLIBS) $(LDLIBS-$*) \ $(CYGWIN32_LIBS) endif # This black magic piece of assembler needs to be linked in in order to # properly terminate the list of imported DLLs. dll_fixup.s: echo '.section .idata$$3' > dll_fixup.s echo '.long 0,0,0,0, 0,0,0,0' >> dll_fixup.s # This bit is necessary to provide an initialization function for the DLL. dll_init.c: echo '__attribute__((stdcall))' > dll_init.c echo 'int dll_entry(int handle, int reason, void *ptr)' >> dll_init.c echo '{return 1; }' >> dll_init.c dont_throw_away: dll_fixup.o dll_init.o