* 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/profile/Makefile.in

@@ -36,7 +36,10 @@ CFLAGS = @CFLAGS@
 CXXFLAGS = @CXXFLAGS@
 
 # 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
 
 # Either crtdll (CRT_ID 1) or msvcrt (CRT_ID 2).
 RUNTIME = @RUNTIME@
@@ -51,8 +54,8 @@ W32API_INCLUDE = @W32API_INCLUDE@
 INCLUDES = -I$(srcdir) -I$(srcdir)/../include \
   -nostdinc \
   -iwithprefixbefore include
-ALL_CFLAGS = $(CFLAGS) $(INCLUDES) $(W32API_INCLUDE) $(MNO_CYGWIN)
-ALL_CXXFLAGS = $(CXXFLAGS) $(INCLUDES) -nostdinc++ $(W32API_INCLUDE) $(MNO_CYGWIN)
+ALL_CFLAGS = $(CFLAGS) $(INCLUDES) $(W32API_INCLUDE)
+ALL_CXXFLAGS = $(CXXFLAGS) $(INCLUDES) -nostdinc++ $(W32API_INCLUDE)
 
 AS = @AS@
 AR = @AR@

winsup/mingw/profile/configure.in

@@ -40,13 +40,13 @@ LIBGMON_A=libgmon.a
 case "$target_os" in
 *mingw32crt*)
   CRT_ID=1
-  MNO_CYGWIN=
+  NO_CYGWIN=
   RUNTIME=crtdll
   CRT0S="gcrt1.o gcrt2.o"
   ;;
 *cygwin*)
   CRT_ID=2
-  MNO_CYGWIN=-mno-cygwin
+  NO_CYGWIN="$(cd ${srcdir}/../../utils; pwd)/mingw"
   RUNTIME=msvcrt
   CRT0S=gcrt0.o
   # Do not build libm.a when building under Cygwin winsup. Otherwise, it'll
@@ -55,7 +55,7 @@ case "$target_os" in
 *)
   # Build it for MSVCRT by default.
   CRT_ID=2
-  MNO_CYGWIN=
+  NO_CYGWIN=
   RUNTIME=msvcrt
   CRT0S="gcrt1.o gcrt2.o"
   ;;
@@ -65,7 +65,7 @@ W32API_INCLUDE='-I $(srcdir)/../../w32api/include'
 
 AC_SUBST(CRT_ID)
 AC_SUBST(RUNTIME)
-AC_SUBST(MNO_CYGWIN)
+AC_SUBST(NO_CYGWIN)
 AC_SUBST(LIBGMON_A)
 AC_SUBST(CRT0S)
 AC_SUBST(W32API_INCLUDE)