MinGW host will now support multi-core processors.

As nproc is not implemented by MinGW, the number of processors is obtained
from the NUMBER_OF_PROCESSORS environmental variable.
On the other hand, Cygwin seems to support nproc.

Author: sp193

scripts/001-binutils-2.14.sh

@@ -19,16 +19,17 @@ cat ../../patches/binutils-$BINUTILS_VERSION-disable-makeinfo-when-texinfo-is-to
 cat ../../patches/binutils-gas.patch | patch -p0 || { exit 1; }
 
 ## Determine the maximum number of processes that Make can work with.
-## MinGW's Make doesn't work properly with multi-core processors.
 OSVER=$(uname)
 if [ ${OSVER:0:10} == MINGW32_NT ]; then
-	PROC_NR=2
+	PROC_NR=$NUMBER_OF_PROCESSORS
 elif [ ${OSVER:0:6} == Darwin ]; then
 	PROC_NR=$(sysctl -n hw.ncpu)
 else
 	PROC_NR=$(nproc)
 fi
 
+echo "Building with $PROC_NR jobs"
+
 ## For each target...
 for TARGET in "ee" "iop" "dvp"; do
 	## Create and enter the build directory.

scripts/002-gcc-3.2.3-stage1.sh

@@ -26,15 +26,16 @@ else
 fi
 
 ## Determine the maximum number of processes that Make can work with.
-## MinGW's Make doesn't work properly with multi-core processors.
 if [ ${OSVER:0:10} == MINGW32_NT ]; then
-	PROC_NR=2
+	PROC_NR=$NUMBER_OF_PROCESSORS
 elif [ ${OSVER:0:6} == Darwin ]; then
 	PROC_NR=$(sysctl -n hw.ncpu)
 else
 	PROC_NR=$(nproc)
 fi
 
+echo "Building with $PROC_NR jobs"
+
 ## For each target...
 for TARGET in "ee" "iop"; do
 	## Create and enter the build directory.

scripts/003-newlib-1.10.0.sh

@@ -17,10 +17,9 @@ if [ -e ../../patches/newlib-$NEWLIB_VERSION-PS2.patch ]; then
 fi
 
 ## Determine the maximum number of processes that Make can work with.
-## MinGW's Make doesn't work properly with multi-core processors.
 OSVER=$(uname)
 if [ ${OSVER:0:10} == MINGW32_NT ]; then
-	PROC_NR=2
+	PROC_NR=$NUMBER_OF_PROCESSORS
 elif [ ${OSVER:0:6} == Darwin ]; then
 	PROC_NR=$(sysctl -n hw.ncpu)
 else

scripts/004-gcc-3.2.3-stage2.sh

@@ -25,15 +25,17 @@ else
 	TARG_XTRA_OPTS="--enable-cxx-flags=-G0"
 fi
 
-## OS Windows doesn't properly work with multi-core processors
+## Determine the maximum number of processes that Make can work with.
 if [ ${OSVER:0:10} == MINGW32_NT ]; then
-	PROC_NR=2
+	PROC_NR=$NUMBER_OF_PROCESSORS
 elif [ ${OSVER:0:6} == Darwin ]; then
 	PROC_NR=$(sysctl -n hw.ncpu)
 else
 	PROC_NR=$(nproc)
 fi
 
+echo "Building with $PROC_NR jobs"
+
 TARGET="ee"
 ## Create and enter the build directory.
 mkdir build-$TARGET-stage2 && cd build-$TARGET-stage2 || { exit 1; }

scripts/005-ps2sdk.sh

@@ -15,10 +15,9 @@ else
 fi
 
 ## Determine the maximum number of processes that Make can work with.
-## MinGW's Make doesn't work properly with multi-core processors.
 OSVER=$(uname)
 if [ ${OSVER:0:10} == MINGW32_NT ]; then
-	PROC_NR=2
+	PROC_NR=$NUMBER_OF_PROCESSORS
 elif [ ${OSVER:0:6} == Darwin ]; then
 	PROC_NR=$(sysctl -n hw.ncpu)
 else