From 5922ffcfa75a18e78c4ae75bb447b34a0d91d12b Mon Sep 17 00:00:00 2001
From: =?utf8?q?Anders=20F=20Bj=C3=B6rklund?= <anders.f.bjorklund@gmail.com>
Date: Sun, 16 Sep 2018 18:28:16 +0200
Subject: [PATCH] Only compile getopt_long.c when needed

ISO C disallows empty translation units
---
 Makefile.in  | 2 +-
 configure.ac | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/Makefile.in b/Makefile.in
index 6f94fb015..308fd562e 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -45,7 +45,7 @@ non_3pp_sources = \
 generated_sources = \
     src/version.c
 3pp_sources = \
-    src/getopt_long.c \
+    @getopt_long_c@ \
     src/hashtable.c \
     src/hashtable_itr.c \
     src/murmurhashneutral2.c \
diff --git a/configure.ac b/configure.ac
index ae2c208bc..50211d85a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -17,6 +17,7 @@ case $host in
 esac
 
 AC_SUBST(extra_libs)
+AC_SUBST(getopt_long_c)
 AC_SUBST(include_dev_mk)
 AC_SUBST(test_suites)
 AC_SUBST(disable_man)
@@ -67,6 +68,10 @@ AC_CHECK_FUNCS(strtok_r)
 AC_CHECK_FUNCS(unsetenv)
 AC_CHECK_FUNCS(utimes)
 
+if test x"$ac_cv_func_getopt_long" != x"yes"; then
+    getopt_long_c="src/getopt_long.c"
+fi
+
 AC_CACHE_CHECK([for compar_fn_t in stdlib.h],ccache_cv_COMPAR_FN_T, [
     AC_TRY_COMPILE(
         [#include <stdlib.h>],
-- 
2.47.2