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/vendor/gc/Makefile.DLLs

http://github.com/feyeleanor/RubyGoLightly
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  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