[bug #20501] "MAKEFLAGS += -rR" doesn't turn off default suffix rules, variables

[Matt McCutchen]

URL:
  <http://savannah.gnu.org/bugs/?20501>

                 Summary: "MAKEFLAGS += -rR" doesn't turn off default suffix
rules, variables
                 Project: make
            Submitted by: hashproduct
            Submitted on: Tuesday 07/17/2007 at 03:58
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: None
        Operating System: POSIX-Based
           Fixed Release: None

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Details:

I'm using GNU make 3.81 on Fedora Core 7 Linux.

I put "MAKEFLAGS += -rR" at the top of my makefile and expected this to
disable all default rules and variables.  However, "make -p" shows that the
default suffix rules and variables are still present.

My makefile, "makeflags.mk" is the following:

-----
MAKEFLAGS += -rR

all:
-----

This illustrates that the options in the makefile do not turn off suffix
rules:

$ make -f makeflags.mk -p | grep '^\..*\..*'
.LIBPATTERNS = lib%.so lib%.a
.web.p:
.l.r:
.F.o:
.y.ln:
.def.sym:
.p.o:
.txinfo.dvi:
.l.ln:
.w.c:
.texi.dvi:
.cc.o:
.SUFFIXES: .out .a .ln .o .c .cc .C .cpp .p .f .F .r .y .l .s .S .mod .sym
.def .h .info .dvi .tex .texinfo .texi .txinfo .w .ch .web .sh .elc .el
.c.o:
.r.o:
.l.c:
.r.f:
.texinfo.info:
.w.tex:
.c.ln:
.s.o:
.texinfo.dvi:
.y.c:
.web.tex:
.texi.info:
.tex.dvi:
.cpp.o:
.C.o:
.txinfo.info:
.S.s:
.mod.o:
.F.f:
.S.o:
.f.o:
$ make -f makeflags.mk -p -rR | grep '^\..*\..*'
(No output)

This happens because default suffix rules and variables are loaded too soon
to be governed by the second call to decode_env_switches that picks up the
MAKEFLAGS set by the makefile.




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