Merge branch 'hn/macos-linker-warning' into next

A linker warning on macOS when building with Xcode 16.3 or newer has
been avoided by passing -fno-common to the compiler when a
sufficiently new linker is detected.

* hn/macos-linker-warning:
  config.mak.uname: avoid macOS linker warning on Xcode 16.3+

Author: gitster

config.mak.uname

@@ -173,6 +173,12 @@ ifeq ($(uname_S),Darwin)
 		NEEDS_GOOD_LIBICONV = UnfortunatelyYes
         endif
 
+	# Silence Xcode 16.3+ linker warning about __DATA,__common alignment.
+	LD_MAJOR_VERSION = $(shell ld -v 2>&1 | sed -n 's/.*PROJECT:ld-\([0-9]*\).*/\1/p')
+        ifeq ($(shell test -n "$(LD_MAJOR_VERSION)" && test "$(LD_MAJOR_VERSION)" -ge 1167 && echo 1),1)
+		BASIC_CFLAGS += -fno-common
+        endif
+
 	# The builtin FSMonitor on MacOS builds upon Simple-IPC.  Both require
 	# Unix domain sockets and PThreads.
         ifndef NO_PTHREADS