[build] Suppress configure's `nothing to be done' message.

This is due to calling the configure script via `make' (within the
top-level `configure' wrapper script).  The same can happen for all
other secondary make targets that are used to only modify the
primary one, e.g., `make setup devel'.

* builds/dos/detect.mk (emx, turboc, watcom, borlandc, borlandc16),
builds/os2/detect (visualage, watcom, borlandc, devel),
builds/unix/detect.mk (devel, lcc, unix), builds/windows/detect.mk
(visualc, watcom, visualage, lcc, mingw32, bcc32, devel-bcc,
devel-gcc): Use no-op recipe.

ChangeLog

@@ -1,3 +1,18 @@
+2018-05-07  Werner Lemberg  <wl@gnu.org>
+
+	[build] Suppress configure's `nothing to be done' message.
+
+	This is due to calling the configure script via `make' (within the
+	top-level `configure' wrapper script).  The same can happen for all
+	other secondary make targets that are used to only modify the
+	primary one, e.g., `make setup devel'.
+
+	* builds/dos/detect.mk (emx, turboc, watcom, borlandc, borlandc16),
+	builds/os2/detect (visualage, watcom, borlandc, devel),
+	builds/unix/detect.mk (devel, lcc, unix), builds/windows/detect.mk
+	(visualc, watcom, visualage, lcc, mingw32, bcc32, devel-bcc,
+	devel-gcc): Use no-op recipe.
+
 2018-05-04  suzuki toshiya  <mpsuzuki@hiroshima-u.ac.jp>
 
 	Support symbol visibility features of Sun / Oracle C compilers.

builds/dos/detect.mk

@@ -80,36 +80,46 @@ ifeq ($(PLATFORM),dos)
   ifneq ($(findstring emx,$(MAKECMDGOALS)),)        # EMX gcc
     CONFIG_FILE := dos-emx.mk
     CC          := gcc
-    emx: setup
+
     .PHONY: emx
+    emx: setup
+	    @cd .
   endif
 
   ifneq ($(findstring turboc,$(MAKECMDGOALS)),)     # Turbo C
     CONFIG_FILE := dos-tcc.mk
     CC          := tcc
-    turboc: setup
+
     .PHONY: turboc
+    turboc: setup
+	    @cd .
   endif
 
   ifneq ($(findstring watcom,$(MAKECMDGOALS)),)     # Watcom C/C++
     CONFIG_FILE := dos-wat.mk
     CC          := wcc386
-    watcom: setup
+
     .PHONY: watcom
+    watcom: setup
+	    @cd .
   endif
 
   ifneq ($(findstring borlandc,$(MAKECMDGOALS)),)   # Borland C/C++ 32-bit
     CONFIG_FILE := dos-bcc.mk
     CC          := bcc32
-    borlandc: setup
+
     .PHONY: borlandc
+    borlandc: setup
+	    @cd .
   endif
 
   ifneq ($(findstring borlandc16,$(MAKECMDGOALS)),) # Borland C/C++ 16-bit
     CONFIG_FILE := dos-bcc.mk
     CC          := bcc
-    borlandc16: setup
+
     .PHONY: borlandc16
+    borlandc16: setup
+	    @cd .
   endif
 
   ifneq ($(findstring bash,$(SHELL)),)              # check for bash

builds/os2/detect.mk

@@ -40,29 +40,37 @@ ifeq ($(PLATFORM),os2)
   ifneq ($(findstring visualage,$(MAKECMDGOALS)),)     # Visual Age C++
     CONFIG_FILE := os2-icc.mk
     CC          := icc
-    visualage: setup
+
     .PHONY: visualage
+    visualage: setup
+	    @cd .
   endif
 
   ifneq ($(findstring watcom,$(MAKECMDGOALS)),)        # Watcom C/C++
     CONFIG_FILE := os2-wat.mk
     CC          := wcc386
-    watcom: setup
+
     .PHONY: watcom
+    watcom: setup
+	    @cd .
   endif
 
   ifneq ($(findstring borlandc,$(MAKECMDGOALS)),)      # Borland C++ 32-bit
     CONFIG_FILE := os2-bcc.mk
     CC          := bcc32
-    borlandc: setup
+
     .PHONY: borlandc
+    borlandc: setup
+	    @cd .
   endif
 
   ifneq ($(findstring devel,$(MAKECMDGOALS)),)         # development target
     CONFIG_FILE := os2-dev.mk
     CC          := gcc
-    devel: setup
+
     .PHONY: devel
+    devel: setup
+	    @cd .
   endif
 
   setup: std_setup

builds/unix/detect.mk

@@ -40,8 +40,10 @@ ifeq ($(PLATFORM),unix)
   ifneq ($(findstring devel,$(MAKECMDGOALS)),)
     CONFIG_FILE := unix-dev.mk
     CC          := gcc
-    devel: setup
+
     .PHONY: devel
+    devel: setup
+	    @:
   else
 
     # If `lcc' is the requested target, we use a special configuration
@@ -50,8 +52,10 @@ ifeq ($(PLATFORM),unix)
     ifneq ($(findstring lcc,$(MAKECMDGOALS)),)
       CONFIG_FILE := unix-lcc.mk
       CC          := lcc
-      lcc: setup
+
       .PHONY: lcc
+      lcc: setup
+	      @:
     else
 
       # If a Unix platform is detected, the configure script is called and
@@ -68,9 +72,11 @@ ifeq ($(PLATFORM),unix)
       # platform).
       #
       CONFIG_FILE := unix.mk
-      unix: setup
       must_configure := 1
+
       .PHONY: unix
+      unix: setup
+	      @:
     endif
   endif
 

builds/windows/detect.mk

@@ -118,64 +118,82 @@ ifeq ($(PLATFORM),windows)
   ifneq ($(findstring visualc,$(MAKECMDGOALS)),)     # Visual C/C++
     CONFIG_FILE := w32-vcc.mk
     CC          := cl
-    visualc: setup
+
     .PHONY: visualc
+    visualc: setup
+	    @cd .
   endif
 
   ifneq ($(findstring intelc,$(MAKECMDGOALS)),)      # Intel C/C++
     CONFIG_FILE := w32-intl.mk
     CC          := cl
-    visualc: setup
+
     .PHONY: intelc
+    visualc: setup
+	    @cd .
   endif
 
   ifneq ($(findstring watcom,$(MAKECMDGOALS)),)      # Watcom C/C++
     CONFIG_FILE := w32-wat.mk
     CC          := wcc386
-    watcom: setup
+
     .PHONY: watcom
+    watcom: setup
+	    @cd .
   endif
 
   ifneq ($(findstring visualage,$(MAKECMDGOALS)),)   # Visual Age C++
     CONFIG_FILE := w32-icc.mk
     CC          := icc
-    visualage: setup
+
     .PHONY: visualage
+    visualage: setup
+	    @cd .
   endif
 
   ifneq ($(findstring lcc,$(MAKECMDGOALS)),)         # LCC-Win32
     CONFIG_FILE := w32-lcc.mk
     CC          := lcc
-    lcc: setup
+
     .PHONY: lcc
+    lcc: setup
+	    @cd .
   endif
 
   ifneq ($(findstring mingw32,$(MAKECMDGOALS)),)     # mingw32
     CONFIG_FILE := w32-mingw32.mk
     CC          := gcc
-    mingw32: setup
+
     .PHONY: mingw32
+    mingw32: setup
+	    @cd .
   endif
 
   ifneq ($(findstring bcc32,$(MAKECMDGOALS)),)       # Borland C++
     CONFIG_FILE := w32-bcc.mk
     CC          := bcc32
-    bcc32: setup
+
     .PHONY: bcc32
+    bcc32: setup
+	    @cd .
   endif
 
   ifneq ($(findstring devel-bcc,$(MAKECMDGOALS)),)   # development target
     CONFIG_FILE := w32-bccd.mk
     CC          := bcc32
-    devel-bcc: setup
+
     .PHONY: devel-bcc
+    devel-bcc: setup
+	    @cd .
   endif
 
   ifneq ($(findstring devel-gcc,$(MAKECMDGOALS)),)   # development target
     CONFIG_FILE := w32-dev.mk
     CC          := gcc
-    devel-gcc: setup
+
     .PHONY: devel-gcc
+    devel-gcc: setup
+	    @cd .
   endif
 
 endif   # test PLATFORM windows