1#-----------------------------------------------------------------------------# 2 3# Makefile.DLLs, version 0.4. 4 5# Contributed by Fergus Henderson. 6 7# This Makefile contains rules for creating DLLs on Windows using gnu-win32. 8 9#-----------------------------------------------------------------------------# 10 11# This rule creates a `.def' file, which lists the symbols that are exported 12# from the DLL. We use `nm' to get a list of all the exported text (`T') 13# symbols and data symbols -- including uninitialized data (`B'), 14# initialized data (`D'), read-only data (`R'), and common blocks (`C'). 15%.def: %.a 16 echo EXPORTS > $@ 17 nm $< | grep '^........ [BCDRT] _' | sed 's/[^_]*_//' >> $@ 18 19# We need to use macros to access global data: 20# the user of the DLL must refer to `foo' as `(*__imp_foo)'. 21# This rule creates a `_globals.h' file, which contains macros 22# for doing this. 23 24SYM_PREFIX = $(firstword $(SYM_PREFIX-$*) $*) 25DLL_MACRO = $(SYM_PREFIX)_USE_DLL 26IMP_MACRO = $(SYM_PREFIX)_IMP 27GLOBAL_MACRO = $(SYM_PREFIX)_GLOBAL 28 29%_globals.h: %.a 30 echo "/* automatically generated by Makefile.DLLs */" > $@ 31 echo "#if defined(__GNUC__) && defined(_WIN32) \\" >> $@ 32 echo " && defined($(DLL_MACRO))" >> $@ 33 echo "# define $(IMP_MACRO)(name) __imp_##name" >> $@ 34 echo "# define $(GLOBAL_MACRO)(name) (*$(IMP_MACRO)(name))" >> $@ 35 echo "#else" >> $@ 36 echo "# define $(GLOBAL_MACRO)(name) name" >> $@ 37 echo "#endif" >> $@ 38 echo "" >> $@ 39 for sym in `nm $< | grep '^........ [BCDR] _' | sed 's/[^_]*_//'`; do \ 40 echo "#define $$sym $(GLOBAL_MACRO)($$sym)" >> $@; \ 41 done 42 43# This rule creates the export object file (`foo.exp') which contains the 44# jump table array; this export object file becomes part of the DLL. 45# This rule also creates the import library (`foo_dll.a') which contains small 46# stubs for all the functions exported by the DLL which jump to them via the 47# jump table. Executables that will use the DLL must be linked against this 48# stub library. 49%.exp %_dll.a : %.def 50 dlltool $(DLLTOOLFLAGS) $(DLLTOOLFLAGS-$*) \ 51 --def $< \ 52 --dllname $*.dll \ 53 --output-exp $*.exp \ 54 --output-lib $*_dll.a 55 56# The `sed' commands below are to convert DOS-style `C:\foo\bar' 57# pathnames into Unix-style `//c/foo/bar' pathnames. 58CYGWIN32_LIBS = $(shell echo \ 59 -L`dirname \`gcc -print-file-name=libgcc.a | \ 60 sed -e 's@^\\\\([A-Za-z]\\\\):@//\\\\1@g' -e 's@\\\\\\\\@/@g' \` ` \ 61 -L`dirname \`gcc -print-file-name=libcygwin.a | \ 62 sed -e 's@^\\\\([A-Za-z]\\\\):@//\\\\1@g' -e 's@\\\\\\\\@/@g' \` ` \ 63 -L`dirname \`gcc -print-file-name=libkernel32.a | \ 64 sed -e 's@^\\\\([A-Za-z]\\\\):@//\\\\1@g' -e 's@\\\\\\\\@/@g' \` ` \ 65 -lgcc -lcygwin -lkernel32 -lgcc) 66 67RELOCATABLE=yes 68 69ifeq "$(strip $(RELOCATABLE))" "yes" 70 71# to create relocatable DLLs, we need to do two passes 72%.dll: %.exp %.a dll_fixup.o dll_init.o 73 $(LD) $(LDFLAGS) $(LDFLAGS-$*) --dll -o $*.base \ 74 -e _dll_entry@12 dll_init.o \ 75 dll_fixup.o $*.exp $*.a \ 76 $(LDLIBS) $(LDLIBS-$*) \ 77 $(CYGWIN32_LIBS) 78 $(LD) $(LDFLAGS) $(LDFLAGS-$*) --dll --base-file $*.base -o $@ \ 79 -e _dll_entry@12 dll_init.o \ 80 dll_fixup.o $*.exp $*.a \ 81 $(LDLIBS) $(LDLIBS-$*) \ 82 $(CYGWIN32_LIBS) 83 rm -f $*.base 84else 85 86%.dll: %.exp %.a dll_fixup.o dll_init.o 87 $(LD) $(LDFLAGS) $(LDFLAGS-$*) --dll -o $@ \ 88 -e _dll_entry@12 dll_init.o \ 89 dll_fixup.o $*.exp $*.a \ 90 $(LDLIBS) $(LDLIBS-$*) \ 91 $(CYGWIN32_LIBS) 92 93endif 94 95# This black magic piece of assembler needs to be linked in in order to 96# properly terminate the list of imported DLLs. 97dll_fixup.s: 98 echo '.section .idata$$3' > dll_fixup.s 99 echo '.long 0,0,0,0, 0,0,0,0' >> dll_fixup.s 100 101# This bit is necessary to provide an initialization function for the DLL. 102dll_init.c: 103 echo '__attribute__((stdcall))' > dll_init.c 104 echo 'int dll_entry(int handle, int reason, void *ptr)' >> dll_init.c 105 echo '{return 1; }' >> dll_init.c 106 107dont_throw_away: dll_fixup.o dll_init.o 108