Fix snprintf symbol for 32-bit

Author: matthew-brett

tools/build_openblas.sh

@@ -62,12 +62,14 @@ if [ "$build_bits" == 64 ]; then
     extra="-fno-asynchronous-unwind-tables"
     vc_arch="X64"
     plat_tag="win_amd64"
+    snprintf_suffix=''
 else
     march=pentium4
     extra="-mfpmath=sse -msse2"
     fextra="-m32"
     vc_arch="i386"
     plat_tag="win32"
+    snprintf_suffix='__mingw_'
 fi
 cflags="-O2 -march=$march -mtune=generic $extra"
 fflags="$fextra $cflags -frecursive -ffpe-summary=invalid,zero"
@@ -86,7 +88,7 @@ fi
 GCC_TAG="gcc_$(gcc -dumpversion | tr .- _)"
 OPENBLAS_VERSION=$(git describe --tags)
 # Patch OpenBLAS to exclude stray GFortran symbol.
-patch -p1  < ../patches/openblas-make-libs.patch
+cat ../patches/openblas-make-libs.patch | sed "s/=snprintf/=${snprintf_suffix}snprintf/" | patch -p1
 # Build OpenBLAS
 # Variable used in creating output libraries
 export LIBNAMESUFFIX=${OPENBLAS_VERSION}-${GCC_TAG}