Merge commit 'dec0d4ec4153bf9fc2b78ae6c2df45b6ea8dde7a' as 'external/sdl/SDL'

external/sdl/SDL/build-scripts/showrev.sh

@@ -0,0 +1,48 @@
+#!/bin/sh
+#
+# Print the current source revision, if available
+
+SDL_ROOT=$(dirname $0)/..
+cd $SDL_ROOT
+
+if [ -e ./VERSION.txt ]; then
+    cat ./VERSION.txt
+    exit 0
+fi
+
+major=$(sed -ne 's/^#define SDL_MAJOR_VERSION  *//p' include/SDL3/SDL_version.h)
+minor=$(sed -ne 's/^#define SDL_MINOR_VERSION  *//p' include/SDL3/SDL_version.h)
+micro=$(sed -ne 's/^#define SDL_PATCHLEVEL  *//p' include/SDL3/SDL_version.h)
+version="${major}.${minor}.${micro}"
+
+if [ -x "$(command -v git)" ]; then
+    rev="$(git describe --tags --long 2>/dev/null)"
+    if [ -n "$rev" ]; then
+        # e.g. release-2.24.0-542-g96361fc47
+        # or release-2.24.1-5-g36b987dab
+        # or prerelease-2.23.2-0-gcb46e1b3f
+        echo "$rev"
+        exit 0
+    fi
+
+    rev="$(git describe --always --tags --long 2>/dev/null)"
+    if [ -n "$rev" ]; then
+        # Just a truncated sha1, e.g. 96361fc47.
+        # Turn it into e.g. 2.25.0-g96361fc47
+        echo "${version}-g${rev}"
+        exit 0
+    fi
+fi
+
+if [ -x "$(command -v p4)" ]; then
+    rev="$(p4 changes -m1 ./...\#have 2>/dev/null| awk '{print $2}')"
+    if [ $? = 0 ]; then
+        # e.g. 2.25.0-p7511446
+        echo "${version}-p${rev}"
+        exit 0
+    fi
+fi
+
+# best we can do
+echo "${version}-no-vcs"
+exit 0