* Makefile.in: Use a different method to invoke gcc in a cygwin-hosted

environment.
* mingwex/Makefile.in: Ditto.
* profile/Makefile.in: Ditto.
* configure.in: Record mingw front-end for building under Cygwin.
* mingwex/configure.in: Ditto.
* profile/configure.in: Ditto.
* configure: Regenerate.
* mingwex/configure: Ditto.
* profile/configure: Ditto.

winsup/mingw/mingwex/Makefile.in

@@ -106,14 +106,17 @@ WARNFLAGS = -Wall
 
 
 # compiling with Cygwin?
-MNO_CYGWIN = @MNO_CYGWIN@
+NO_CYGWIN := @NO_CYGWIN@
+ifdef NO_CYGWIN
+override CC := ${NO_CYGWIN} $(firstword $(filter-out ${NO_CYGWIN},${CC}))
+endif
 
 W32API_INCLUDE = @W32API_INCLUDE@
 INCLUDES = -I$(srcdir) -I$(srcdir)/.. -I$(srcdir)/../include \
   -nostdinc \
   -iwithprefixbefore include
-ALL_CFLAGS = $(CFLAGS) $(WARNFLAGS) $(OPTFLAGS) $(INCLUDES) $(W32API_INCLUDE) $(MNO_CYGWIN)
-ALL_CXXFLAGS = $(CXXFLAGS) $(WARNFLAGS) $(OPTFLAGS) $(INCLUDES) -nostdinc++ $(W32API_INCLUDE) $(MNO_CYGWIN)
+ALL_CFLAGS = $(CFLAGS) $(WARNFLAGS) $(OPTFLAGS) $(INCLUDES) $(W32API_INCLUDE)
+ALL_CXXFLAGS = $(CXXFLAGS) $(WARNFLAGS) $(OPTFLAGS) $(INCLUDES) -nostdinc++ $(W32API_INCLUDE)
 
 AS = @AS@
 AR = @AR@

winsup/mingw/mingwex/configure.in

@@ -37,15 +37,15 @@ AC_CANONICAL_SYSTEM
 
 case "$target_os" in
 *cygwin*)
-  MNO_CYGWIN=-mno-cygwin
+  NO_CYGWIN="$(cd ${srcdir}/../../utils; pwd)/mingw"
   ;;
 *)
   # Build it for MSVCRT by default.
-  MNO_CYGWIN=
+  NO_CYGWIN=
   ;;
 esac
 
-AC_SUBST(MNO_CYGWIN)
+AC_SUBST(NO_CYGWIN)
 
 W32API_INCLUDE='-I $(srcdir)/../../w32api/include'
 AC_SUBST(W32API_INCLUDE)