uname: report msys2-runtime commit hash, too

Having just Cygwin's version in the output of `uname` is not helpful as
both MSYS2 as well as Git for Windows release intermediate versions of
the MSYS2 runtime much more often than Cygwin runtime versions are
released.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

winsup/configure.ac

@@ -65,20 +65,25 @@ AC_ARG_WITH([msys2-runtime-commit],
 case "$MSYS2_RUNTIME_COMMIT" in
 no)
     MSYS2_RUNTIME_COMMIT=
+    MSYS2_RUNTIME_COMMIT_SHORT=
     MSYS2_RUNTIME_COMMIT_HEX=0
     ;;
 yes|auto)
     MSYS2_RUNTIME_COMMIT="$(git --git-dir="$srcdir/../.git" rev-parse HEAD)" ||
     AC_MSG_ERROR([Could not determine msys2-runtime commit"])
-    MSYS2_RUNTIME_COMMIT_HEX="0x$(expr "$MSYS2_RUNTIME_COMMIT" : '\(.\{,8\}\)')ull"
+    MSYS2_RUNTIME_COMMIT_SHORT="$(expr "$MSYS2_RUNTIME_COMMIT" : '\(.\{,8\}\)')"
+    MSYS2_RUNTIME_COMMIT_HEX="0x${MSYS2_RUNTIME_COMMIT_SHORT}ul"
 test "0xull" != "$MSYS2_RUNTIME_COMMIT_HEX" || AC_MSG_ERROR([Huh? "$MSYS2_RUNTIME_COMMIT" translates into "$MSYS2_RUNTIME_COMMIT_HEX"? expr "$MSYS2_RUNTIME_COMMIT" : '^\([0-9a-f]\{7,16\}\)'])
     ;;
 *)
     expr "$MSYS2_RUNTIME_COMMIT" : '@<:@0-9a-f@:>@\{6,64\}$' ||
     AC_MSG_ERROR([Invalid commit name: "$MSYS2_RUNTIME_COMMIT"])
-    MSYS2_RUNTIME_COMMIT_HEX="0x$(expr "$MSYS2_RUNTIME_COMMIT" : '\(.\{,8\}\)')ull"
+    MSYS2_RUNTIME_COMMIT_SHORT="$(expr "$MSYS2_RUNTIME_COMMIT" : '\(.\{,8\}\)')"
+    MSYS2_RUNTIME_COMMIT_HEX="0x${MSYS2_RUNTIME_COMMIT_SHORT}ul"
     ;;
 esac
+AC_SUBST(MSYS2_RUNTIME_COMMIT)
+AC_SUBST(MSYS2_RUNTIME_COMMIT_SHORT)
 AC_SUBST(MSYS2_RUNTIME_COMMIT_HEX)
 
 AC_ARG_ENABLE(debugging,

winsup/cygwin/Makefile.am

@@ -17,7 +17,9 @@ if TARGET_X86_64
 COMMON_CFLAGS+=-mcmodel=small
 endif
 
-VERSION_CFLAGS = -DMSYS2_RUNTIME_COMMIT_HEX="@MSYS2_RUNTIME_COMMIT_HEX@"
+VERSION_CFLAGS = -DMSYS2_RUNTIME_COMMIT="\"@MSYS2_RUNTIME_COMMIT@\""
+VERSION_CFLAGS += -DMSYS2_RUNTIME_COMMIT_SHORT="\"@MSYS2_RUNTIME_COMMIT_SHORT@\""
+VERSION_CFLAGS += -DMSYS2_RUNTIME_COMMIT_HEX="@MSYS2_RUNTIME_COMMIT_HEX@"
 COMMON_CFLAGS += $(VERSION_CFLAGS)
 
 AM_CFLAGS=$(cflags_common) $(COMMON_CFLAGS)
@@ -408,7 +410,7 @@ src_files := $(foreach dir,$(dirs),$(find_src_files))
 version.cc: mkvers.sh include/cygwin/version.h winver.rc $(src_files)
 	@echo "Making version.cc and winver.o";\
 	export CC="$(CC)";\
-	/bin/sh $(word 1,$^) $(word 2,$^) $(word 3,$^) $(WINDRES) $(CFLAGS)
+	/bin/sh $(word 1,$^) $(word 2,$^) $(word 3,$^) $(WINDRES) $(CFLAGS) $(VERSION_CFLAGS)
 
 winver.o: version.cc
 

winsup/cygwin/mkvers.sh

@@ -16,6 +16,7 @@ incfile="$1"; shift
 rcfile="$1"; shift
 windres="$1"; shift
 iflags=
+msys2_runtime_commit=
 # Find header file locations
 while [ -n "$*" ]; do
   case "$1" in
@@ -26,6 +27,9 @@ while [ -n "$*" ]; do
     shift
     iflags="$iflags -I$1"
       ;;
+  -DMSYS2_RUNTIME_COMMIT=*)
+    msys2_runtime_commit="${1#*=}"
+    ;;
   esac
   shift
 done
@@ -185,6 +189,10 @@ then
   cvs_tag="$(echo $wv_cvs_tag | sed -e 's/-branch.*//')"
   cygwin_ver="$cygwin_ver-$cvs_tag"
 fi
+if [ -n "$msys2_runtime_commit" ]
+then
+  cygwin_ver="$cygwin_ver-$msys2_runtime_commit"
+fi
 
 echo "Version $cygwin_ver"
 set -$- $builddate

winsup/cygwin/uname.cc

@@ -64,10 +64,11 @@ uname_x (struct utsname *name)
       cygwin_gethostname (buf, sizeof buf - 1);
       strncat (name->nodename, buf, sizeof (name->nodename) - 1);
       /* release */
-      __small_sprintf (name->release, "%d.%d.%d-%d.",
+      __small_sprintf (name->release, "%d.%d.%d-%s-%d.",
 		       cygwin_version.dll_major / 1000,
 		       cygwin_version.dll_major % 1000,
 		       cygwin_version.dll_minor,
+		       MSYS2_RUNTIME_COMMIT_SHORT,
 		       cygwin_version.api_minor);
       /* version */
       stpcpy (name->version, cygwin_version.dll_build_date);