From: Pádraig Brady <P@draigBrady.com>
Date: Tue, 18 Nov 2025 15:30:26 +0000 (+0000)
Subject: build: support --enable-single-binary=hardlinks
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=59d9f05ef766734662e97bab7e27c397d1132408;p=thirdparty%2Fcoreutils.git

build: support --enable-single-binary=hardlinks

* Makefile.am: Use ln rather than $(LN_S) for hardlinks.
* configure.ac: Accept --enable-single-binary=hardlinks.
* man/local.mk: In hardlink mode, explicitly add the
hardlink creation rule to mandeps.  Given the automake
generated dependency chain, this ensures that the hardlinks
are created _after_ the multicall binary, with `make all`
or `make check` etc.
* src/local.mk: Define the new src/coreutils_hardlinks rule,
and only depend on src/coreutils_{symlinks,shebangs} if
in those modes, so that hardlinks are created _after_
the multicall binary, and other link types before.
* NEWS: Mention the new feature.
Addresses https://github.com/coreutils/coreutils/issues/129
---

diff --git a/Makefile.am b/Makefile.am
index 71f0936834..577d3f4ae0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -188,11 +188,14 @@ install-exec-hook:
 	  test $$p = x && continue;					\
 	  ptrans=$$(printf '%s' "$$p" | sed -e "$(transform)");		\
 	  rm -f $(DESTDIR)$(bindir)/$$ptrans$(EXEEXT) || exit $$?;	\
-	  if test "x$(single_binary_install_type)" = xshebangs; then	\
+	  if test "$(single_binary_install_type)" = shebangs; then	\
 	    printf '#!%s --coreutils-prog-shebang=%s\n'			\
 	      $(bindir)/$$ctrans$(EXEEXT) $$p				\
 	      >$(DESTDIR)$(bindir)/$$ptrans$(EXEEXT) || exit $$?;	\
 	    chmod a+x,a-w $(DESTDIR)$(bindir)/$$ptrans$(EXEEXT) || exit $$?;\
+	  elif test "$(single_binary_install_type)" = hardlinks; then	\
+	    ln $(DESTDIR)$(bindir)/$$ctrans$(EXEEXT)			\
+	      $(DESTDIR)$(bindir)/$$ptrans$(EXEEXT) || exit $$?;	\
 	  else								\
 	    $(LN_S) -s $$ctrans$(EXEEXT)				\
 	      $(DESTDIR)$(bindir)/$$ptrans$(EXEEXT) || exit $$?;	\
diff --git a/NEWS b/NEWS
index d3909147ad..b021ed40a5 100644
--- a/NEWS
+++ b/NEWS
@@ -14,6 +14,11 @@ GNU coreutils NEWS                                    -*- outline -*-
 
 ** New Features
 
+  configure accepts a new --enable-single-binary=hardlinks mode to build the
+  selected programs as hard links to a multi-call binary called "coreutils".
+  This augments the existing "symlinks" and "shebangs" modes already
+  supported by the --enable-single-binary option.
+
   'tail' now accepts the --debug option, which is currently used to
   detail the --follow implementation being used.
 
diff --git a/configure.ac b/configure.ac
index 5e99ef386c..ff7cea1d99 100644
--- a/configure.ac
+++ b/configure.ac
@@ -105,16 +105,16 @@ AC_DEFUN([gl_GCC_VERSION_IFELSE],
 )
 
 AC_ARG_ENABLE([single-binary],
-  [AS_HELP_STRING([--enable-single-binary=[shebangs|symlinks]],
+  [AS_HELP_STRING([--enable-single-binary=[shebangs|symlinks|hardlinks]],
      [Compile all the tools in a single binary, reducing the overall size.
-      When compiled this way, shebangs (default when enabled) or symlinks are
-      installed for each tool that points to the single binary.])],
+      When compiled this way, shebangs (default when enabled), symlinks, or
+      hardlinks are installed for each tool, which point to a single binary])],
   [gl_single_binary=no ;
    case $enableval in
      yes) gl_single_binary=shebangs ;;
-     no|shebangs|symlinks) gl_single_binary=$enableval ;;
+     no|shebangs|symlinks|hardlinks) gl_single_binary=$enableval ;;
      *)      AC_MSG_ERROR([bad value $enableval for single-binary option.
-                           Options are: symlinks, shebangs, no.]) ;;
+                           Options are: hardlinks, symlinks, shebangs, no.]) ;;
    esac],
   [gl_single_binary=no]
 )
@@ -126,13 +126,15 @@ AC_ARG_ENABLE([single-binary-exceptions],
   [gl_single_binary_exceptions=$enableval],
   [gl_single_binary_exceptions=]
 )
-if test "$gl_single_binary" = 'symlinks'; then
+if test "$gl_single_binary" = 'symlinks' ||
+   test "$gl_single_binary" = 'hardlinks'; then
   if ! test "`echo ls | sed \"$program_transform_name\"`" = 'ls'; then
     AC_MSG_ERROR([program name transformations are not currently supported
-                  with --enable-single-binary=symlinks.])
+                  with --enable-single-binary=$gl_single_binary.])
   fi
 fi
 AM_CONDITIONAL([SINGLE_BINARY], [test "$gl_single_binary" != no])
+AM_CONDITIONAL([SINGLE_BINARY_HARD], [test "$gl_single_binary" == hardlinks])
 
 AC_ARG_ENABLE([bold-man-page-references],
   [AS_HELP_STRING([--disable-bold-man-page-references],
diff --git a/man/local.mk b/man/local.mk
index 9759eabce4..ae9dfeb9cc 100644
--- a/man/local.mk
+++ b/man/local.mk
@@ -61,7 +61,11 @@ mandeps += $(top_srcdir)/src/system.h
 $(ALL_MANS): $(mandeps)
 
 if SINGLE_BINARY
+if SINGLE_BINARY_HARD
+mandeps += src/coreutils_hardlinks
+else
 mandeps += src/coreutils$(EXEEXT)
+endif
 else
 # Most prog.1 man pages depend on src/prog.  List the exceptions:
 man/install.1:   src/ginstall$(EXEEXT)
diff --git a/src/local.mk b/src/local.mk
index d1f1b9462d..8758793452 100644
--- a/src/local.mk
+++ b/src/local.mk
@@ -529,11 +529,23 @@ EXTRA_src_coreutils_DEPENDENCIES = $(single_binary_deps)
 
 include $(top_srcdir)/src/single-binary.mk
 
-# Creates symlinks or shebangs to the installed programs when building
-# coreutils single binary.
+# Creates symlinks, or shebangs to the installed programs
+# _before_ building coreutils single binary.
+if !SINGLE_BINARY_HARD
 EXTRA_src_coreutils_DEPENDENCIES += src/coreutils_$(single_binary_install_type)
+endif
 endif SINGLE_BINARY
 
+# Creates hardlinks _after_ building the coreutils single binary.
+CLEANFILES += src/coreutils_hardlinks
+src/coreutils_hardlinks: src/coreutils$(EXEEXT)
+	$(AM_V_GEN)touch $@
+	$(AM_V_at)for i in x $(single_binary_progs); do \
+		test $$i = x && continue; \
+		rm -f src/$$i$(EXEEXT) || exit $$?; \
+		ln src/coreutils$(EXEEXT) src/$$i$(EXEEXT) || exit $$?; \
+	done
+
 CLEANFILES += src/coreutils_symlinks
 src/coreutils_symlinks: Makefile
 	$(AM_V_GEN)touch $@