Bug 1293315 - remove RUSTFLAGS and friends from the build system; r=m…

…shal

Now that we compile with cargo, we don't have fine-grained control over
the build flags used via environment variables detected in configure or
set in config.mk.  We should just remove that dead code so nobody trips
over it.

config/config.mk

@@ -136,7 +136,6 @@ PYTHON_PATH = $(PYTHON) $(topsrcdir)/config/pythonpath.py
 _DEBUG_ASFLAGS :=
 _DEBUG_CFLAGS :=
 _DEBUG_LDFLAGS :=
-_DEBUG_RUSTFLAGS :=
 
 ifneq (,$(MOZ_DEBUG)$(MOZ_DEBUG_SYMBOLS))
   ifeq ($(AS),$(YASM))
@@ -152,14 +151,12 @@ ifneq (,$(MOZ_DEBUG)$(MOZ_DEBUG_SYMBOLS))
   endif
   _DEBUG_CFLAGS += $(MOZ_DEBUG_FLAGS)
   _DEBUG_LDFLAGS += $(MOZ_DEBUG_LDFLAGS)
-  _DEBUG_RUSTFLAGS += -g
 endif
 
 ASFLAGS += $(_DEBUG_ASFLAGS)
 OS_CFLAGS += $(_DEBUG_CFLAGS)
 OS_CXXFLAGS += $(_DEBUG_CFLAGS)
 OS_LDFLAGS += $(_DEBUG_LDFLAGS)
-RUSTFLAGS += $(_DEBUG_RUSTFLAGS)
 
 # XXX: What does this? Bug 482434 filed for better explanation.
 ifeq ($(OS_ARCH)_$(GNU_CC),WINNT_)
@@ -289,7 +286,6 @@ CFLAGS		+= $(MOZ_OPTIMIZE_FLAGS)
 CXXFLAGS	+= $(MOZ_OPTIMIZE_FLAGS)
 endif # MOZ_OPTIMIZE == 1
 LDFLAGS		+= $(MOZ_OPTIMIZE_LDFLAGS)
-RUSTFLAGS	+= $(MOZ_OPTIMIZE_RUSTFLAGS)
 endif # MOZ_OPTIMIZE
 
 HOST_CFLAGS	+= $(_DEPEND_CFLAGS)

old-configure.in

@@ -25,7 +25,6 @@ LDFLAGS="${LDFLAGS=}"
 HOST_CFLAGS="${HOST_CFLAGS=}"
 HOST_CXXFLAGS="${HOST_CXXFLAGS=}"
 HOST_LDFLAGS="${HOST_LDFLAGS=}"
-RUSTFLAGS="${RUSTFLAGS=}"
 
 dnl ========================================================
 dnl = Preserve certain environment flags passed to configure
@@ -4718,10 +4717,6 @@ if test -z "$MOZ_OPTIMIZE_FLAGS"; then
     MOZ_OPTIMIZE_FLAGS="-O"
 fi
 
-if test -z "$MOZ_OPTIMIZE_RUSTFLAGS"; then
-    MOZ_OPTIMIZE_RUSTFLAGS="-O"
-fi
-
 MOZ_ARG_ENABLE_STRING(optimize,
 [  --disable-optimize      Disable compiler optimization
   --enable-optimize=[OPT] Specify compiler optimization flags [OPT=-O]],
@@ -4757,7 +4752,6 @@ fi # COMPILE_ENVIRONMENT
 AC_SUBST(MOZ_OPTIMIZE)
 AC_SUBST(MOZ_FRAMEPTR_FLAGS)
 AC_SUBST(MOZ_OPTIMIZE_FLAGS)
-AC_SUBST(MOZ_OPTIMIZE_RUSTFLAGS)
 AC_SUBST(MOZ_OPTIMIZE_LDFLAGS)
 AC_SUBST_LIST(MOZ_ALLOW_HEAP_EXECUTE_FLAGS)
 AC_SUBST(MOZ_PGO)
@@ -6307,8 +6301,6 @@ AC_SUBST(HOST_LD)
 AC_SUBST(HOST_RANLIB)
 AC_SUBST(HOST_BIN_SUFFIX)
 
-AC_SUBST(RUSTFLAGS)
-
 AC_SUBST(TARGET_XPCOM_ABI)
 AC_SUBST(HAVE_TOOLCHAIN_SUPPORT_MSSSE3)
 AC_SUBST(HAVE_TOOLCHAIN_SUPPORT_MSSE4_1)
@@ -6654,7 +6646,6 @@ export CPPFLAGS
 export CFLAGS
 export CXXFLAGS
 export LDFLAGS
-export RUSTFLAGS
 export HOST_CC
 export HOST_CXX
 export HOST_CFLAGS