From 2f66319a3a973e7cc4d8f124746d41d2d8b37c2d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Kijewski?= <rene.kijewski@fu-berlin.de>
Date: Thu, 19 Jun 2014 13:13:06 +0200
Subject: [PATCH] make: OSX: don't fail for empty .a archives

Fixes issue #1333.
---
 .gitattributes   |   1 +
 Makefile.include |   5 +++++
 dist/ar-wrapper  |  20 ++++++++++++++++++++
 dist/empty.a     | Bin 0 -> 8 bytes
 4 files changed, 26 insertions(+)
 create mode 100644 .gitattributes
 create mode 100755 dist/ar-wrapper
 create mode 100644 dist/empty.a

diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000000..c9839d64f4
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.a binary
diff --git a/Makefile.include b/Makefile.include
index 4a60d6f502..78285a6ed8 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -54,6 +54,11 @@ include $(RIOTBOARD)/$(BOARD)/Makefile.include
 include $(RIOTCPU)/$(CPU)/Makefile.include
 include $(RIOTBASE)/Makefile.dep
 
+# OSX fails to create empty archives. Provide a wrapper to catch that error.
+ifneq (0, $(shell mkdir -p $(BINDIR); $(AR) -rc $(BINDIR)empty-archive.a 2> /dev/null; echo $$?))
+	AR := $(RIOTBASE)/dist/ar-wrapper $(AR)
+endif
+
 # Test if there where dependencies against a module in DISABLE_MODULE.
 ifneq (, $(filter $(DISABLE_MODULE), $(USEMODULE)))
 $(error "Required modules were disabled using DISABLE_MODULE: $(sort $(filter $(DISABLE_MODULE), $(USEMODULE)))")
diff --git a/dist/ar-wrapper b/dist/ar-wrapper
new file mode 100755
index 0000000000..a3d17d74c4
--- /dev/null
+++ b/dist/ar-wrapper
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# This wrapper takes the arguments: <ar> <operation> <archive> <files...>
+# <ar> can be any ar implementation.
+# <operations>, <archive> and <files...> are the normal arguments to <ar>.
+#
+# OS X's ar implementation has the problem, that it refuses to create empty archives.
+# This wrapper will copy a provided empty .a file to <archive> if it was told to.
+
+# If <operations> contains "r", and there are no <files...> given.
+if [ "${2#*r}" != "$2" ] && [ "$#" -eq 3 ]; then
+    # If <archive> exists, do nothing, otherwise copy an empty archive.
+    [ -e "$3" ] || cp "${0%ar-wrapper}/empty.a" "$3"
+else
+    # Otherwise act like this wrapper was not present.
+    "$@"
+fi
+
+# Return the exit code of the last invocation ("[", "cp", or <ar>).
+exit $?
diff --git a/dist/empty.a b/dist/empty.a
new file mode 100644
index 0000000000000000000000000000000000000000..8b277f0dd5dcdcb9c4b6c0b7a32153664f111266
GIT binary patch
literal 8
PcmY$iNi0gvu;T&%3Vs4a

literal 0
HcmV?d00001