也许这是一个非常明显的答案，但我正在尝试在 Windows 环境中使用 C 扩展 Ruby，当我运行 mingw32-make 时无法进行扩展，它会生成一个名为“forktest-i386-”的文件mingw32.def”，然后说“没有规则来制作目标 'ruby.h'，需要 'forktest.o'”。
Forktest 是我正在尝试制作的扩展名。
makefile 是由 ruby 自己的 create_makefile 命令生成的，它真的很复杂，所以我无法对其进行头脑或故事，但无论如何它都在这里：
SHELL = /bin/sh
# V=0 quiet, V=1 verbose. other values don't work.
V = 0
Q1 = $(V:1=)
Q = $(Q1:0=@)
n=$(NULLCMD)
ECHO1 = $(V:1=@$n)
ECHO = $(ECHO1:0=@echo)
#### Start of system configuration section. ####
srcdir = .
topdir = /D/Programs/Ruby193/include/ruby-1.9.1
hdrdir = /D/Programs/Ruby193/include/ruby-1.9.1
arch_hdrdir = D:/Programs/Ruby193/include/ruby-1.9.1/$(arch)
VPATH = $(srcdir):$(arch_hdrdir)/ruby:$(hdrdir)/ruby
DESTDIR = D:
prefix = $(DESTDIR)/Programs/Ruby193
rubylibprefix = $(libdir)/$(RUBY_BASE_NAME)
exec_prefix = $(prefix)
vendorhdrdir = $(rubyhdrdir)/vendor_ruby
sitehdrdir = $(rubyhdrdir)/site_ruby
rubyhdrdir = $(includedir)/$(RUBY_BASE_NAME)-$(ruby_version)
vendordir = $(rubylibprefix)/vendor_ruby
sitedir = $(rubylibprefix)/site_ruby
ridir = $(datarootdir)/$(RI_BASE_NAME)
mandir = $(datarootdir)/man
localedir = $(datarootdir)/locale
libdir = $(exec_prefix)/lib
psdir = $(docdir)
pdfdir = $(docdir)
dvidir = $(docdir)
htmldir = $(docdir)
infodir = $(datarootdir)/info
docdir = $(datarootdir)/doc/$(PACKAGE)
oldincludedir = $(DESTDIR)/usr/include
includedir = $(prefix)/include
localstatedir = $(prefix)/var
sharedstatedir = $(prefix)/com
sysconfdir = $(prefix)/etc
datadir = $(datarootdir)
datarootdir = $(prefix)/share
libexecdir = $(exec_prefix)/libexec
sbindir = $(exec_prefix)/sbin
bindir = $(exec_prefix)/bin
rubylibdir = $(rubylibprefix)/$(ruby_version)
archdir = $(rubylibdir)/$(arch)
sitelibdir = $(sitedir)/$(ruby_version)
sitearchdir = $(sitelibdir)/$(sitearch)
vendorlibdir = $(vendordir)/$(ruby_version)
vendorarchdir = $(vendorlibdir)/$(sitearch)
NULLCMD = :
CC = gcc
CXX = g++
LIBRUBY = lib$(RUBY_SO_NAME).dll.a
LIBRUBY_A = lib$(RUBY_SO_NAME)-static.a
LIBRUBYARG_SHARED = -l$(RUBY_SO_NAME)
LIBRUBYARG_STATIC = -l$(RUBY_SO_NAME)-static
OUTFLAG = -o
COUTFLAG = -o
RUBY_EXTCONF_H =
cflags = $(optflags) $(debugflags) $(warnflags)
optflags = -O3
debugflags = -g
warnflags = -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wimplicit-function-declaration
CFLAGS = $(cflags)
INCFLAGS = -I. -I$(arch_hdrdir) -I$(hdrdir)/ruby/backward -I$(hdrdir) -I$(srcdir)
DEFS =
CPPFLAGS = $(DEFS) $(cppflags)
CXXFLAGS = $(CFLAGS) $(cxxflags)
ldflags = -L.
dldflags = -Wl,--enable-auto-image-base,--enable-auto-import $(DEFFILE)
ARCH_FLAG =
DLDFLAGS = $(ldflags) $(dldflags)
LDSHARED = $(CC) -shared $(if $(filter-out -g -g0,$(debugflags)),,-s)
LDSHAREDXX = $(CXX) -shared $(if $(filter-out -g -g0,$(debugflags)),,-s)
AR = ar
EXEEXT = .exe
RUBY_BASE_NAME = ruby
RUBY_INSTALL_NAME = ruby
RUBY_SO_NAME = msvcrt-ruby191
arch = i386-mingw32
sitearch = i386-msvcrt
ruby_version = 1.9.1
ruby = D:/Programs/Ruby193/bin/ruby
RUBY = $(ruby)
RM = rm -f
RM_RF = $(RUBY) -run -e rm -- -rf
RMDIRS = rmdir --ignore-fail-on-non-empty -p
MAKEDIRS = /usr/bin/mkdir -p
INSTALL = /usr/bin/install -c
INSTALL_PROG = $(INSTALL) -m 0755
INSTALL_DATA = $(INSTALL) -m 644
COPY = cp
#### End of system configuration section. ####
preload =
libpath = . $(libdir)
LIBPATH = -L. -L$(libdir)
DEFFILE = $(TARGET)-$(arch).def
CLEANFILES = mkmf.log $(DEFFILE)
DISTCLEANFILES =
DISTCLEANDIRS =
extout =
extout_prefix =
target_prefix =
LOCAL_LIBS =
LIBS = $(LIBRUBYARG_SHARED) -lshell32 -lws2_32 -limagehlp
SRCS = forktest.c ruby.c
OBJS = forktest.o ruby.o
TARGET = forktest
DLLIB = $(TARGET).so
EXTSTATIC =
STATIC_LIB =
BINDIR = $(bindir)
RUBYCOMMONDIR = $(sitedir)$(target_prefix)
RUBYLIBDIR = $(sitelibdir)$(target_prefix)
RUBYARCHDIR = $(sitearchdir)$(target_prefix)
HDRDIR = $(rubyhdrdir)/ruby$(target_prefix)
ARCHHDRDIR = $(rubyhdrdir)/$(arch)/ruby$(target_prefix)
TARGET_SO = $(DLLIB)
CLEANLIBS = $(TARGET).so
CLEANOBJS = *.o *.bak
all: $(DLLIB)
static: $(STATIC_LIB)
.PHONY: all install static install-so install-rb
.PHONY: clean clean-so clean-rb
clean-rb-default::
clean-rb::
clean-so::
clean: clean-so clean-rb-default clean-rb
@-$(RM) $(CLEANLIBS) $(CLEANOBJS) $(CLEANFILES)
distclean-rb-default::
distclean-rb::
distclean-so::
distclean: clean distclean-so distclean-rb-default distclean-rb
@-$(RM) Makefile $(RUBY_EXTCONF_H) conftest.* mkmf.log
@-$(RM) core ruby$(EXEEXT) *~ $(DISTCLEANFILES)
@-$(RMDIRS) $(DISTCLEANDIRS) 2> /dev/null || true
realclean: distclean
install: install-so install-rb
install-so: $(RUBYARCHDIR)
install-so: $(RUBYARCHDIR)/$(DLLIB)
$(RUBYARCHDIR)/$(DLLIB): $(DLLIB)
@-$(MAKEDIRS) $(@D)
$(INSTALL_PROG) $(DLLIB) $(@D)
install-rb: pre-install-rb install-rb-default
install-rb-default: pre-install-rb-default
pre-install-rb: Makefile
pre-install-rb-default: Makefile
pre-install-rb-default:
$(ECHO) installing default forktest libraries
$(RUBYARCHDIR):
$(Q) $(MAKEDIRS) $@
site-install: site-install-so site-install-rb
site-install-so: install-so
site-install-rb: install-rb
.SUFFIXES: .c .m .cc .mm .cxx .cpp .o
.cc.o:
$(ECHO) compiling $(<)
$(Q) $(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $<
.mm.o:
$(ECHO) compiling $(<)
$(Q) $(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $<
.cxx.o:
$(ECHO) compiling $(<)
$(Q) $(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $<
.cpp.o:
$(ECHO) compiling $(<)
$(Q) $(CXX) $(INCFLAGS) $(CPPFLAGS) $(CXXFLAGS) $(COUTFLAG)$@ -c $<
.c.o:
$(ECHO) compiling $(<)
$(Q) $(CC) $(INCFLAGS) $(CPPFLAGS) $(CFLAGS) $(COUTFLAG)$@ -c $<
.m.o:
$(ECHO) compiling $(<)
$(Q) $(CC) $(INCFLAGS) $(CPPFLAGS) $(CFLAGS) $(COUTFLAG)$@ -c $<
$(DLLIB): $(DEFFILE) $(OBJS) Makefile
$(ECHO) linking shared-object $(DLLIB)
@-$(RM) $(@)
$(Q) $(LDSHARED) -o $@ $(OBJS) $(LIBPATH) $(DLDFLAGS) $(LOCAL_LIBS) $(LIBS)
$(DEFFILE):
$(ECHO) generating $(@)
$(Q) $(RUBY) -e "puts 'EXPORTS', '' + 'Init_$(TARGET)'.sub(/\..*\z/,'')" > $@
$(OBJS): $(hdrdir)/ruby.h $(hdrdir)/ruby/defines.h $(arch_hdrdir)/ruby/config.h