btrfs-progs: autoconf: move custom CFLAGS from makefile

Keep only flags that are required to build properly, current fine
tunings are moved to the optional defaults in configure and can be
overriden by the user.

Signed-off-by: David Sterba <dsterba@suse.cz>

Makefile.in

@@ -10,12 +10,14 @@ INSTALL = @INSTALL@
 DISABLE_DOCUMENTATION = @DISABLE_DOCUMENTATION@
 DISABLE_BTRFSCONVERT = @DISABLE_BTRFSCONVERT@
 
-# Non-static compilation flags
+# Common build flags
 CFLAGS = @CFLAGS@ \
-	 -include config.h -Wall \
-	 -D_FILE_OFFSET_BITS=64 -DBTRFS_FLAT_INCLUDES \
+	 -include config.h \
+	 -D_FILE_OFFSET_BITS=64 \
+	 -DBTRFS_FLAT_INCLUDES \
 	 -D_XOPEN_SOURCE=700  \
-	 -fno-strict-aliasing -fPIC \
+	 -fno-strict-aliasing \
+	 -fPIC \
 	 -rdynamic
 
 LDFLAGS = @LDFLAGS@

configure.ac

@@ -8,7 +8,7 @@ LIBBTRFS_MAJOR=0
 LIBBTRFS_MINOR=1
 LIBBTRFS_PATCHLEVEL=1
 
-CFLAGS=${CFLAGS:-"-g -O1"}
+CFLAGS=${CFLAGS:-"-g -O1 -Wall"}
 AC_SUBST([CFLAGS])
 
 AC_PREREQ([2.60])