bug#6673: [PATCH] only build libstdbuf.so when stdbuf is enabled

[Mike Frysinger]

Currently, only main programs (like stdbuf) can be disabled at configure
time.  Helper programs (like libstdbuf.so) do not have a configure option.

Even if you disable stdbuf with the configure option, libstdbuf.so will
still be compiled and installed.  So delay the parsing of helper programs
until after we know the final enable list, and then only build libstdbuf.so
when stdbuf is also enabled.

Signed-off-by: Mike Frysinger <address@hidden>
---
 configure.ac |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index e7037a1..acd397e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -332,7 +332,6 @@ if test $gl_cv_list_mounted_fs = yes && test 
$gl_cv_fs_space = yes; then
 fi
 
 # Limit stdbuf to ELF systems with GCC
-optional_pkglib_progs=
 AC_MSG_CHECKING([whether this is an ELF system])
 AC_EGREP_CPP([yes], [#if __ELF__
 yes
@@ -341,7 +340,6 @@ AC_MSG_RESULT([$elf_sys])
 if test "$elf_sys" = "yes" && \
    test "$GCC" = "yes"; then
   gl_ADD_PROG([optional_bin_progs], [stdbuf])
-  gl_ADD_PROG([optional_pkglib_progs], [libstdbuf.so])
 fi
 
 ############################################################################
@@ -395,6 +393,13 @@ esac
 # corresponding ./configure option argument is comma-separated on input.
 gl_INCLUDE_EXCLUDE_PROG([optional_bin_progs], [arch,hostname,su])
 
+# Now that we know which programs will actually be built up, figure out
+# which optional helper progs should be compiled.
+optional_pkglib_progs=
+case " $optional_bin_progs " in
+  *' stdbuf '*) gl_ADD_PROG([optional_pkglib_progs], [libstdbuf.so]) ;;
+esac
+
 # Set INSTALL_SU if su installation has been requested via
 # --enable-install-program=su.
 AC_SUBST([INSTALL_SU])
-- 
1.7.1.1