configure.ac: add --disable-install-mjit-header

and substitute INSTALL_MJIT_HEADER. This would be convenient as a workaround
for user if we found a platform that can't compile Ruby after Ruby 2.6.0 release.

common.mk: Install MJIT header only when INSTALL_MJIT_HEADER
Makefile.in: ditto
win32/Makefile.sub: ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65171 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Makefile.in

@@ -76,6 +76,7 @@ XCFLAGS = @XCFLAGS@ $(MATHN:yes=-DCANONICALIZATION_FOR_MATHN)
 USE_RUBYGEMS = @USE_RUBYGEMS@
 USE_RUBYGEMS_ = $(USE_RUBYGEMS:yes=)
 CPPFLAGS = @CPPFLAGS@ $(INCFLAGS) $(USE_RUBYGEMS_:no=-DDISABLE_RUBYGEMS=1)
+INSTALL_MJIT_HEADER = @INSTALL_MJIT_HEADER@
 MJIT_HEADER_FLAGS = @MJIT_HEADER_FLAGS@
 MJIT_HEADER_SUFFIX =
 MJIT_HEADER_ARCH =
@@ -435,8 +436,8 @@ probes.$(OBJEXT): $(srcdir)/probes.d $(DTRACE_REBUILD:yes=probes.stamp)
 	$(Q) $(RM) $@
 	$(Q) $(DTRACE) -G -C $(INCFLAGS) -s $(srcdir)/probes.d -o $@ $(DTRACE_REBUILD_OBJS)
 
-main: $(MJIT_MIN_HEADER)
-mjit-headers: $(MJIT_MIN_HEADER)
+main: mjit-headers
+yes-mjit-headers: $(MJIT_MIN_HEADER)
 clean-local::
 	$(Q)$(RM) $(MJIT_HEADER) $(MJIT_HEADER:.h=)$(MJIT_HEADER_SUFFIX:%=*).h
 	$(Q)$(RM) $(MJIT_MIN_HEADER) $(MJIT_MIN_HEADER:.h=)$(MJIT_HEADER_SUFFIX:%=*).h

common.mk

@@ -201,8 +201,9 @@ all: $(SHOWFLAGS) main docs
 main: $(SHOWFLAGS) exts $(ENCSTATIC:static=lib)encs
 	@$(NULLCMD)
 
-.PHONY: mjit-headers
-mjit-headers: mjit_config.h
+mjit-headers: $(INSTALL_MJIT_HEADER)-mjit-headers
+no-mjit-headers: PHONY
+yes-mjit-headers: mjit_config.h PHONY
 
 mjit.$(OBJEXT): mjit_config.h
 mjit_config.h: Makefile

configure.ac

@@ -3320,6 +3320,11 @@ AC_SUBST(CAPITARGET)
 AS_CASE(["$RDOCTARGET:$CAPITARGET"],[nodoc:nodoc],[INSTALLDOC=nodoc],[INSTALLDOC=all])
 AC_SUBST(INSTALLDOC)
 
+AC_ARG_ENABLE(install-mjit-header,
+        AS_HELP_STRING([--disable-install-mjit-header], [do not install MJIT header]),
+        [INSTALL_MJIT_HEADER=$enableval], [INSTALL_MJIT_HEADER=yes])
+AC_SUBST(INSTALL_MJIT_HEADER)
+
 AC_ARG_ENABLE(install-static-library,
 	AS_HELP_STRING([--disable-install-static-library], [do not install static ruby library]),
 	[INSTALL_STATIC_LIBRARY=$enableval],
@@ -3981,6 +3986,7 @@ config_summary "debugflags"          "$debugflags"
 config_summary "warnflags"           "$warnflags"
 config_summary "strip command"       "$STRIP"
 config_summary "install doc"         "$install_doc"
+config_summary "install MJIT header" "$INSTALL_MJIT_HEADER"
 config_summary "man page type"       "$MANTYPE"
 config_summary "search path"         "$search_path"
 config_summary "static-linked-ext"   ${EXTSTATIC:+"yes"}

win32/Makefile.sub

@@ -302,6 +302,9 @@ CPPFLAGS = $(DEFS) $(ARCHDEFS) $(CPPFLAGS)
 !if "$(USE_RUBYGEMS)" == "no"
 CPPFLAGS = -DDISABLE_RUBYGEMS $(CPPFLAGS)
 !endif
+!ifndef INSTALL_MJIT_HEADER
+INSTALL_MJIT_HEADER = yes
+!endif
 !if "$(CPPOUTFLAG)" == ">"
 MJIT_HEADER_FLAGS =
 !else
@@ -1271,8 +1274,8 @@ probes.h: {$(VPATH)}probes.dmyh
 #include "$(*F).dmyh"
 <<KEEP
 
-main: $(MJIT_PRECOMPILED_HEADER)
-mjit-headers: $(MJIT_PRECOMPILED_HEADER)
+main: mjit-headers
+yes-mjit-headers: $(MJIT_PRECOMPILED_HEADER)
 clean-local::
 	$(Q)$(RM) $(MJIT_PRECOMPILED_HEADER_NAME) $(MJIT_PRECOMPILED_HEADER_NAME:.pch=.)$(OBJEXT)
 	$(Q)$(RM) $(TIMESTAMPDIR)/$(MJIT_PRECOMPILED_HEADER_NAME:.pch=.time) mjit_config.h