From fc420d58aff427d500abb879a0f9adf85d0c77c4 Mon Sep 17 00:00:00 2001
From: Philippe Teuwen <yobibe@gmail.com>
Date: Wed, 27 Mar 2013 16:58:01 +0100
Subject: [PATCH] Only include SPI related files when (at least) one SPI driver
 is enabled

---
 configure.ac             | 5 ++++-
 libnfc/buses/Makefile.am | 5 +++--
 m4/libnfc_drivers.m4     | 1 +
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index 6176591..5e7e486 100644
--- a/configure.ac
+++ b/configure.ac
@@ -118,9 +118,12 @@ fi
 # Handle --with-drivers option
 LIBNFC_ARG_WITH_DRIVERS
 
-# Enable UART if 
+# Enable UART if
 AM_CONDITIONAL(UART_ENABLED, [test x"$uart_required" = x"yes"])
 
+# Enable SPI if
+AM_CONDITIONAL(SPI_ENABLED, [test x"$spi_required" = x"yes"])
+
 # Documentation (default: no)
 AC_ARG_ENABLE([doc],AS_HELP_STRING([--enable-doc],[Enable documentation generation.]),[enable_doc=$enableval],[enable_doc="no"])
 
diff --git a/libnfc/buses/Makefile.am b/libnfc/buses/Makefile.am
index c1b8056..a875ed7 100644
--- a/libnfc/buses/Makefile.am
+++ b/libnfc/buses/Makefile.am
@@ -8,11 +8,12 @@ libnfcbuses_la_CFLAGS = -I$(top_srcdir)/libnfc
 libnfcbuses_la_LIBADD = 
 EXTRA_DIST =
 
-# SPI_ENABLED
+if SPI_ENABLED
 libnfcbuses_la_SOURCES += spi.c spi.h
 libnfcbuses_la_CFLAGS +=
 libnfcbuses_la_LIBADD +=
-EXTRA_DIST = spi_posix.c
+endif
+EXTRA_DIST = spi.c spi.h
 
 if UART_ENABLED
   libnfcbuses_la_SOURCES += uart.c uart.h
diff --git a/m4/libnfc_drivers.m4 b/m4/libnfc_drivers.m4
index 62f734a..e27eed1 100644
--- a/m4/libnfc_drivers.m4
+++ b/m4/libnfc_drivers.m4
@@ -76,6 +76,7 @@ AC_DEFUN([LIBNFC_ARG_WITH_DRIVERS],
                   DRIVERS_CFLAGS="$DRIVERS_CFLAGS -DDRIVER_PN532_UART_ENABLED"
                   ;;
     pn532_spi)
+                  spi_required="yes"
                   driver_pn532_spi_enabled="yes"
                   DRIVERS_CFLAGS="$DRIVERS_CFLAGS -DDRIVER_PN532_SPI_ENABLED"
                   ;;