[PATCH v3] timezone: add a configure flag to disable program install

[Mike Frysinger <vapier at gentoo dot org>]

Some distros build+install the timezone tools (zic/zdump/tzselect) outside
of glibc and use the upstream package directly.  Add a configure flag to
glibc so they can disable install of those tools.

This allows tests to run & pass regardless of the configure flag.  Only
the install of them is impacted.

2015-09-18  Mike Frysinger  <vapier@gentoo.org>

	* config.make.in (enable-timezone-tools): New variable.
	* configure.ac (AC_ARG_ENABLE(timezone-tools)): New configure flag.
	(enable_timezone_tools): Export to generated files.
	* configure: Regenerate.
	* INSTALL: Regenerate.
	* manual/install.texi (--disable-timezone-tools): Document new flag.
	* timezone/Makefile (install-sbin, install-bin-script): Wrap in a
	ifeq ($(enable-timezone-tools),yes) check.
---
v3
	- use @command{} in the manual for program names
	- add a warning about version skew between external programs

 INSTALL             | 10 ++++++++++
 config.make.in      |  1 +
 configure           | 13 +++++++++++++
 configure.ac        |  6 ++++++
 manual/install.texi | 10 ++++++++++
 timezone/Makefile   |  8 +++++---
 6 files changed, 45 insertions(+), 3 deletions(-)

diff --git a/INSTALL b/INSTALL
index d55de5d..c4e0d17 100644
--- a/INSTALL
+++ b/INSTALL
@@ -127,6 +127,16 @@ will be used, and CFLAGS sets optimization options for the compiler.
      library.  This option hardcodes the newly built C library path in
      dynamic tests so that they can be invoked directly.
 
+'--disable-timezone-tools'
+     By default, timezone related utilities ('zic', 'zdump', and
+     'tzselect') are installed with glibc.  If you are building these
+     independently (e.g.  by using the tzcode package), then this option
+     will allow disabling the install of these too.
+
+     Note that you need to make sure the external tools are up-to-date
+     with the versions that glibc uses so that newer formats glibc may
+     utilize are supported.
+
 '--enable-lock-elision=yes'
      Enable lock elision for pthread mutexes by default.
 
diff --git a/config.make.in b/config.make.in
index a9f5696..bea371d 100644
--- a/config.make.in
+++ b/config.make.in
@@ -52,6 +52,7 @@ have-z-execstack = @libc_cv_z_execstack@
 have-Bgroup = @libc_cv_Bgroup@
 have-protected-data = @libc_cv_protected_data@
 with-fp = @with_fp@
+enable-timezone-tools = @enable_timezone_tools@
 old-glibc-headers = @old_glibc_headers@
 unwind-find-fde = @libc_cv_gcc_unwind_find_fde@
 have-forced-unwind = @libc_cv_forced_unwind@
diff --git a/configure b/configure
index 45cc7cb..fe402ea 100755
--- a/configure
+++ b/configure
@@ -676,6 +676,7 @@ force_install
 bindnow
 enable_lock_elision
 hardcoded_path_in_tests
+enable_timezone_tools
 use_default_link
 sysheaders
 with_fp
@@ -759,6 +760,7 @@ with_default_link
 enable_sanity_checks
 enable_shared
 enable_profile
+enable_timezone_tools
 enable_hardcoded_path_in_tests
 enable_stackguard_randomization
 enable_lock_elision
@@ -1411,6 +1413,9 @@ Optional Features:
                           in special situations) [default=yes]
   --enable-shared         build shared library [default=yes if GNU ld]
   --enable-profile        build profiled library [default=no]
+  --disable-timezone-tools
+                          do not install timezone tools (if using external
+                          ones) [default=install]
   --enable-hardcoded-path-in-tests
                           hardcode newly built glibc path in tests
                           [default=no]
@@ -3548,6 +3553,14 @@ else
   profile=no
 fi
 
+# Check whether --enable-timezone-tools was given.
+if test "${enable_timezone_tools+set}" = set; then :
+  enableval=$enable_timezone_tools; enable_timezone_tools=$enableval
+else
+  enable_timezone_tools=yes
+fi
+
+
 
 # Check whether --enable-hardcoded-path-in-tests was given.
 if test "${enable_hardcoded_path_in_tests+set}" = set; then :
diff --git a/configure.ac b/configure.ac
index 7e9383a..95d700e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -159,6 +159,12 @@ AC_ARG_ENABLE([profile],
 			     [build profiled library @<:@default=no@:>@]),
 	      [profile=$enableval],
 	      [profile=no])
+AC_ARG_ENABLE([timezone-tools],
+	      AC_HELP_STRING([--disable-timezone-tools],
+			     [do not install timezone tools (if using external ones) @<:@default=install@:>@]),
+	      [enable_timezone_tools=$enableval],
+	      [enable_timezone_tools=yes])
+AC_SUBST(enable_timezone_tools)
 
 AC_ARG_ENABLE([hardcoded-path-in-tests],
 	      AC_HELP_STRING([--enable-hardcoded-path-in-tests],
diff --git a/manual/install.texi b/manual/install.texi
index 63c41b0..63a9bef 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -157,6 +157,16 @@ By default, dynamic tests are linked to run with the installed C library.
 This option hardcodes the newly built C library path in dynamic tests
 so that they can be invoked directly.
 
+@item --disable-timezone-tools
+By default, timezone related utilities (@command{zic}, @command{zdump},
+and @command{tzselect}) are installed with glibc.  If you are building
+these independently (e.g. by using the tzcode package), then this option
+will allow disabling the install of these too.
+
+Note that you need to make sure the external tools are up-to-date with
+the versions that glibc uses so that newer formats glibc may utilize
+are supported.
+
 @item --enable-lock-elision=yes
 Enable lock elision for pthread mutexes by default.
 
diff --git a/timezone/Makefile b/timezone/Makefile
index bfb3463..a0b8adb 100644
--- a/timezone/Makefile
+++ b/timezone/Makefile
@@ -27,15 +27,17 @@ extra-objs := scheck.o ialloc.o
 others	:= zdump zic
 tests	:= test-tz tst-timezone tst-tzset
 
-install-sbin := zic zdump
-
 generated-dirs += testdata
 
-install-bin-script = tzselect
 generated += tzselect
 
 testdata = $(objpfx)testdata
 
+ifeq ($(enable-timezone-tools),yes)
+install-sbin := zic zdump
+install-bin-script = tzselect
+endif
+
 ifeq ($(run-built-tests),yes)
 # List zones generated by separate commands running zic on the host.
 # Each such zic run counts as a separate test.
-- 
2.5.1