enable GCC large address aware linker flag (Windows only)

- this flag allows bitcoin-qt.exe / bitcoind.exe (32-bit application) to
  handle addresses larger than 2GB (up to 3GB on x86 Windows and up to
  4GB on x64 Windows)

bitcoin-qt.pro

@@ -44,6 +44,8 @@ QMAKE_LFLAGS *= -fstack-protector-all
 QMAKE_CXXFLAGS *= -D_FORTIFY_SOURCE=2 -Wl,-z,relro -Wl,-z,now
 # for extra security on Windows: enable ASLR and DEP via GCC linker flags
 win32:QMAKE_LFLAGS *= -Wl,--dynamicbase -Wl,--nxcompat
+# on Windows: enable GCC large address aware linker flag
+win32:QMAKE_LFLAGS *= -Wl,--large-address-aware
 
 # use: qmake "USE_QRCODE=1"
 # libqrencode (http://fukuchi.org/works/qrencode/index.en.html) must be installed for support

src/makefile.linux-mingw

@@ -33,7 +33,8 @@ LIBS= \
 DEFS=-D_MT -DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB -DBOOST_SPIRIT_THREADSAFE
 DEBUGFLAGS=-g
 CFLAGS=-O2 -w -Wall -Wextra -Wformat -Wformat-security -Wno-unused-parameter $(DEBUGFLAGS) $(DEFS) $(INCLUDEPATHS)
-LDFLAGS=-Wl,--dynamicbase -Wl,--nxcompat
+# enable: ASLR, DEP and large address aware
+LDFLAGS=-Wl,--dynamicbase -Wl,--nxcompat -Wl,--large-address-aware
 
 TESTDEFS = -DTEST_DATA_DIR=$(abspath test/data)
 

src/makefile.mingw

@@ -28,7 +28,8 @@ LIBS= \
 DEFS=-DWIN32 -D_WINDOWS -DBOOST_THREAD_USE_LIB -DBOOST_SPIRIT_THREADSAFE
 DEBUGFLAGS=-g
 CFLAGS=-mthreads -O2 -w -Wall -Wextra -Wformat -Wformat-security -Wno-unused-parameter $(DEBUGFLAGS) $(DEFS) $(INCLUDEPATHS)
-LDFLAGS=-Wl,--dynamicbase -Wl,--nxcompat
+# enable: ASLR, DEP and large address aware
+LDFLAGS=-Wl,--dynamicbase -Wl,--nxcompat -Wl,--large-address-aware
 
 TESTDEFS = -DTEST_DATA_DIR=$(abspath test/data)