Maybe this is a really obvious answer, but I'm trying to extend Ruby using C in a Windows environment and I can't make the extension when I run mingw32-make it gets as far as generating a file called "forktest-i386-mingw32.def" and then says "No rule to make target 'ruby.h', needed by 'forktest.o'".
Forktest is the name of the extension that I'm trying to make.
The makefile was generated by ruby's own create_makefile command and it's really convoluted so I can't make heads or tales of it, but here it is anyway:
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
