4 files changed, 16 insertions, 7 deletions
diff --git a/libphobos/libdruntime/MERGE b/libphobos/libdruntime/MERGE
index 00c8518..840f8dd 100644
--- a/libphobos/libdruntime/MERGE
+++ b/libphobos/libdruntime/MERGE
@@ -1,4 +1,4 @@
-c6863be7206eef3c393726363a480baf0a0c6530
+09ed02ce56ea5bf3e59f21ee0390cd85eb8bfaa7
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/dmd repository.
diff --git a/libphobos/libdruntime/Makefile.am b/libphobos/libdruntime/Makefile.am
index 252c6a3..4098310 100644
--- a/libphobos/libdruntime/Makefile.am
+++ b/libphobos/libdruntime/Makefile.am
@@ -25,7 +25,8 @@ D_EXTRA_DFLAGS=-fpreview=dip1000 -fpreview=fieldwise -fpreview=dtorfields \
 # D flags for compilation
 AM_DFLAGS= \
 	$(phobos_lt_pic_flag) $(phobos_compiler_shared_flag) \
-	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(SECTION_FLAGS) $(CET_FLAGS)
+	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(SECTION_FLAGS) $(CET_FLAGS) \
+	$(OS_DFLAGS)
 
 # Flags for other kinds of sources
 AM_CFLAGS=$(CET_FLAGS)
@@ -444,4 +445,4 @@ DRUNTIME_DSOURCES_WINDOWS = core/sys/windows/accctrl.d \
 	core/sys/windows/winuser.d core/sys/windows/winver.d \
 	core/sys/windows/wtsapi32.d core/sys/windows/wtypes.d
 
-DRUNTIME_DISOURCES = __builtins.di __main.di
+DRUNTIME_DISOURCES = __importc_builtins.di __main.di
diff --git a/libphobos/libdruntime/Makefile.in b/libphobos/libdruntime/Makefile.in
index 52b0c37..1c0fa54 100644
--- a/libphobos/libdruntime/Makefile.in
+++ b/libphobos/libdruntime/Makefile.in
@@ -676,6 +676,7 @@ NM = @NM@
 NMEDIT = @NMEDIT@
 OBJDUMP = @OBJDUMP@
 OBJEXT = @OBJEXT@
+OS_DFLAGS = @OS_DFLAGS@
 OS_LINK_SPEC = @OS_LINK_SPEC@
 OTOOL = @OTOOL@
 OTOOL64 = @OTOOL64@
@@ -783,7 +784,8 @@ D_EXTRA_DFLAGS = -fpreview=dip1000 -fpreview=fieldwise -fpreview=dtorfields \
 # D flags for compilation
 AM_DFLAGS = \
 	$(phobos_lt_pic_flag) $(phobos_compiler_shared_flag) \
-	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(SECTION_FLAGS) $(CET_FLAGS)
+	$(WARN_DFLAGS) $(CHECKING_DFLAGS) $(SECTION_FLAGS) $(CET_FLAGS) \
+	$(OS_DFLAGS)
 
 
 # Flags for other kinds of sources
@@ -1124,7 +1126,7 @@ DRUNTIME_DSOURCES_WINDOWS = core/sys/windows/accctrl.d \
 	core/sys/windows/winuser.d core/sys/windows/winver.d \
 	core/sys/windows/wtsapi32.d core/sys/windows/wtypes.d
 
-DRUNTIME_DISOURCES = __builtins.di __main.di
+DRUNTIME_DISOURCES = __importc_builtins.di __main.di
 all: all-am
 
 .SUFFIXES:
diff --git a/libphobos/libdruntime/__builtins.di b/libphobos/libdruntime/__importc_builtins.di
index b4fef09..9493962 100644
--- a/libphobos/libdruntime/__builtins.di
+++ b/libphobos/libdruntime/__importc_builtins.di
@@ -3,10 +3,10 @@
  * The purpose is to make it unnecessary to hardwire them into the compiler.
  * As the leading double underscore suggests, this is for internal use only.
  *
- * Copyright: Copyright Digital Mars 2022
+ * Copyright: Copyright D Language Foundation 2022-2025
  * License:   $(HTTP www.boost.org/LICENSE_1_0.txt, Boost License 1.0).
  * Authors:   Walter Bright
- * Source: $(DRUNTIMESRC __builtins.d)
+ * Source: $(DRUNTIMESRC __importc_builtins.di)
  */
 
 
@@ -86,6 +86,12 @@ version (DigitalMars)
         return core.bitop.bswap(value);
     }
 
+    uint  __builtin__popcount()(ulong value)
+    {
+        import core.bitop;
+        return core.bitop._popcnt(value);
+    }
+
     // Lazily imported on first use
     private alias c_long = imported!"core.stdc.config".c_long;