From a25366cc980695cebe40c2d471bfe5166dcb28a2 Mon Sep 17 00:00:00 2001
From: Dana Robinson <derobins@hdfgroup.org>
Date: Sun, 12 Nov 2017 23:22:39 -0800
Subject: Fixed that annoying ar warning about -u being ignored.

---
 config/linux-gnulibc1   | 5 +++++
 configure.ac            | 2 ++
 src/libhdf5.settings.in | 1 +
 3 files changed, 8 insertions(+)

diff --git a/config/linux-gnulibc1 b/config/linux-gnulibc1
index 39225e7..c32f64e 100644
--- a/config/linux-gnulibc1
+++ b/config/linux-gnulibc1
@@ -30,6 +30,11 @@ if test -z "$CC"; then
     fi
 fi
 
+# Set flags for gnu ar (apparently via libtool, so AR_FLAGS, not ARFLAGS)
+# If you don't do this, you will get warnings about the 'u' in
+# automake's default 'cru' args.
+AR_FLAGS=crD
+
 # Figure out GNU C compiler flags
 . $srcdir/config/gnu-flags
 
diff --git a/configure.ac b/configure.ac
index d8f3873..50893f7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -99,6 +99,7 @@ AC_CONFIG_COMMANDS([pubconf], [
 AC_CANONICAL_HOST
 AC_SUBST([CPPFLAGS])
 AC_SUBST([JNIFLAGS])
+AC_SUBST([AR_FLAGS])
 
 ## H5_CFLAGS (and company) are for CFLAGS that should be used on HDF5, but
 ## not exported to h5cc (or h5fc, etc.)
@@ -139,6 +140,7 @@ JNIFLAGS="${JNIFLAGS}"
 JAVACFLAGS="${JAVACFLAGS}"
 JAVAFLAGS="${JAVAFLAGS}"
 LDFLAGS="${LDFLAGS}"
+AR_FLAGS="${AR_FLAGS}"
 
 ## Configure may need to alter any of the *FLAGS variables in order for
 ## various checks to work correctly. Save the user's value here so it
diff --git a/src/libhdf5.settings.in b/src/libhdf5.settings.in
index 8017594..51b24dc 100644
--- a/src/libhdf5.settings.in
+++ b/src/libhdf5.settings.in
@@ -28,6 +28,7 @@ Linking Options:
                      AM_LDFLAGS: @AM_LDFLAGS@
                 Extra libraries: @LIBS@
                        Archiver: @AR@
+                       AR_FLAGS: @AR_FLAGS@
                          Ranlib: @RANLIB@
 
 Languages:
-- 
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