makedef: Extend the script for use with mingw tools as well

This is invoked by setting the NM and AR variables to the names of
those specific tools. The ARCH variable also needs to be provided,
to choose the symbol prefix (nm doesn't provide any option that
dumps the architecture easily).
Signed-off-by: Martin Storsjö <martin@martin.st>

compat/windows/makedef

@@ -45,7 +45,11 @@ libname=$(mktemp -u "library").lib
 
 trap 'rm -f -- $libname' EXIT
 
-lib -out:${libname} $@ >/dev/null
+if [ -n "$AR" ]; then
+    $AR rcs ${libname} $@ >/dev/null
+else
+    lib -out:${libname} $@ >/dev/null
+fi
 if [ $? != 0 ]; then
     echo "Could not create temporary library." >&2
     exit 1
@@ -57,18 +61,28 @@ IFS='
 # Determine if we're building for x86 or x86_64 and
 # set the symbol prefix accordingly.
 prefix=""
-arch=$(dumpbin -headers ${libname} |
-       tr '\t' ' ' |
-       grep '^ \+.\+machine \+(.\+)' |
-       head -1 |
-       sed -e 's/^ \{1,\}.\{1,\} \{1,\}machine \{1,\}(\(...\)).*/\1/')
-
-if [ "${arch}" = "x86" ]; then
-    prefix="_"
+if [ -n "$NM" ]; then
+    case $ARCH in
+    *86)
+        prefix="_"
+        ;;
+    *)
+        ;;
+    esac
 else
-    if [ "${arch}" != "ARM" ] && [ "${arch}" != "x64" ]; then
-        echo "Unknown machine type." >&2
-        exit 1
+    arch=$(dumpbin -headers ${libname} |
+           tr '\t' ' ' |
+           grep '^ \+.\+machine \+(.\+)' |
+           head -1 |
+           sed -e 's/^ \{1,\}.\{1,\} \{1,\}machine \{1,\}(\(...\)).*/\1/')
+
+    if [ "${arch}" = "x86" ]; then
+        prefix="_"
+    else
+        if [ "${arch}" != "ARM" ] && [ "${arch}" != "x64" ]; then
+            echo "Unknown machine type." >&2
+            exit 1
+        fi
     fi
 fi
 
@@ -112,10 +126,19 @@ for line in $(cat ${vscript} | tr '\t' ' '); do
 '
 done
 
-dump=$(dumpbin -linkermember:1 ${libname} |
-          sed -e '/public symbols/,$!d' -e '/^ \{1,\}Summary/,$d' -e "s/ \{1,\}${prefix}/ /" -e 's/ \{1,\}/ /g' |
-          tail -n +2 |
-          cut -d' ' -f3)
+if [ -n "$NM" ]; then
+    # Use eval, since NM="nm -g"
+    dump=$(eval "$NM --defined-only -g ${libname}" |
+              grep -v : |
+              grep -v ^$ |
+              cut -d' ' -f3 |
+              sed -e "s/^${prefix}//")
+else
+    dump=$(dumpbin -linkermember:1 ${libname} |
+              sed -e '/public symbols/,$!d' -e '/^ \{1,\}Summary/,$d' -e "s/ \{1,\}${prefix}/ /" -e 's/ \{1,\}/ /g' |
+              tail -n +2 |
+              cut -d' ' -f3)
+fi
 
 rm ${libname}