Add some simple tests to the configure script to detect strndup and
getline.  It's not important that the tests run, just that they
compile and link without any errors.

Signed-off-by: Jeffrey C. Ollie <jeff@ocjtech.us>
---
 configure     |   20 +++++++++++++++++++-
 getlinetest.c |   13 +++++++++++++
 strnduptest.c |   10 ++++++++++
 3 files changed, 42 insertions(+), 1 deletions(-)
 create mode 100644 getlinetest.c
 create mode 100644 strnduptest.c

diff --git a/configure b/configure
index b4770ec..44c1700 100755
--- a/configure
+++ b/configure
@@ -118,6 +118,24 @@ EOF
     exit 1
 fi
 
+if ! gcc -o strnduptest strnduptest.c > /dev/null 2>&1
+then
+    echo "Checking for strndup... No."
+    strndup=-Dstrndup=_notmuch_strndup
+else
+    echo "Checking for strndup... Yes."
+fi
+rm -f strnduptest
+
+if ! gcc -o getlinetest getlinetest.c > /dev/null 2>&1
+then
+    echo "Checking for getline... No."
+    getline=-Dgetline=_notmuch_getline
+else
+    echo "Checking for getline... Yes."
+fi
+rm -f getlinetest
+
 cat <<EOF
 
 All required packages were found. You may now run the following
@@ -132,5 +150,5 @@ EOF
 cat > Makefile.config <<EOF
 prefix = /usr/local
 bash_completion_dir = /etc/bash_completion.d
-CFLAGS += ${have_valgrind}
+CFLAGS += ${have_valgrind} ${strndup} ${getline}
 EOF
diff --git a/getlinetest.c b/getlinetest.c
new file mode 100644
index 0000000..2a21a50
--- /dev/null
+++ b/getlinetest.c
@@ -0,0 +1,13 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <sys/types.h>
+
+int main()
+{
+  ssize_t count = 0;
+  size_t n = 0;
+  char **lineptr = NULL;
+  FILE *stream = NULL;
+
+  count = getline(lineptr, &n, stream);
+}
diff --git a/strnduptest.c b/strnduptest.c
new file mode 100644
index 0000000..97c7c80
--- /dev/null
+++ b/strnduptest.c
@@ -0,0 +1,10 @@
+#include <string.h>
+
+int main()
+{
+  char *d;
+  const char *s = "";
+  size_t n = 0;
+
+  d = strndup(s, n);
+}
-- 
1.6.5.2