Makefile: CFLAGS, LDFLAGS

Split CFLAGS into CFLAGS (user part) and AM_CFLAGS (not-so-user part;
variable name taken from automake, but otherwise no relation).
Also add LDFLAGS.
This allows me to use `make CFLAGS="-O2 -fPIE" LDFLAGS="-pie"` without
dropping the other important (AM_CFLAGS) flags.

Signed-off-by: Jan Engelhardt <jengelh@computergmbh.de>
---
 btrfs-progs/Makefile |   17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/Makefile b/Makefile
index b09d47b..03dbfdc 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 CC=gcc
-CFLAGS = -g -Wall -fno-strict-aliasing -Werror -D_FILE_OFFSET_BITS=64
+AM_CFLAGS = -Wall -fno-strict-aliasing -D_FILE_OFFSET_BITS=64
+CFLAGS = -g -Werror
 objects = ctree.o disk-io.o radix-tree.o extent-tree.o print-tree.o \
          root-tree.o dir-item.o hash.o file-item.o inode-item.o \
          inode-map.o crc32c.o rbtree.o extent-cache.o \
@@ -23,28 +24,28 @@ endif
 
 .c.o:
        $(check) $<
-       $(CC) $(DEPFLAGS) $(CFLAGS) -c $<
+       $(CC) $(DEPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c $<
 
 
 all: $(progs)
 
 btrfsctl: btrfsctl.o
-       gcc $(CFLAGS) -o btrfsctl btrfsctl.o
+       gcc $(CFLAGS) -o btrfsctl btrfsctl.o $(LDFLAGS)
 
 btrfsck: $(objects) btrfsck.o bit-radix.o
-       gcc $(CFLAGS) -o btrfsck btrfsck.o $(objects) bit-radix.o
+       gcc $(CFLAGS) -o btrfsck btrfsck.o $(objects) bit-radix.o $(LDFLAGS)
 
 mkfs.btrfs: $(objects) mkfs.o
-       gcc $(CFLAGS) -o mkfs.btrfs $(objects) mkfs.o -luuid
+       gcc $(CFLAGS) -o mkfs.btrfs $(objects) mkfs.o -luuid $(LDFLAGS)
 
 debug-tree: $(objects) debug-tree.o
-       gcc $(CFLAGS) -o debug-tree $(objects) debug-tree.o -luuid
+       gcc $(CFLAGS) -o debug-tree $(objects) debug-tree.o -luuid $(LDFLAGS)
 
 dir-test: $(objects) dir-test.o
-       gcc $(CFLAGS) -o dir-test $(objects) dir-test.o
+       gcc $(CFLAGS) -o dir-test $(objects) dir-test.o $(LDFLAGS)
 
 quick-test: $(objects) quick-test.o
-       gcc $(CFLAGS) -o quick-test $(objects) quick-test.o
+       gcc $(CFLAGS) -o quick-test $(objects) quick-test.o $(LDFLAGS)
 
 clean :
        rm -f $(progs) cscope.out *.o .*.d