librados examples: link and include from current source tree by default.

Fixes #15100. The Makefile now by default links and includes from the
current source tree's librados and offers another option for building
examples against the system's.

Signed-off-by: Jesse Williamson <nerd.cpp@gmail.com>

diff --git a/examples/librados/Makefile b/examples/librados/Makefile
index f1fbed0f9aad0638acddd2d2d5dede68eb413899..8d9d926935be5afb982a9a13dd0c146993a2c75f 100644 (file)
--- a/examples/librados/Makefile
+++ b/examples/librados/Makefile
@@ -1,15 +1,35 @@
-CXXFLAGS=-std=c++0x -I../../src/include
-CFLAGS=-I../../src/include
-all: librados_hello_world librados_hello_world_c
 
-librados_hello_world: hello_world.cc
-       g++ -g -c hello_world.cc -o hello_world.o $(CXXFLAGS)
-       g++ -g hello_world.o -lrados -o librados_hello_world $(LDFLAGS)
+CXX?=g++
+CXX_FLAGS?=-std=c++11 -Wall -Wextra -Werror -g
+CXX_LIBS?=-lboost_system -lrados
+CXX_INC?=$(LOCAL_LIBRADOS_INC)
+CXX_CC=$(CXX) $(CXX_FLAGS) $(CXX_INC) $(LOCAL_LIBRADOS) $(CXX_LIBS)
 
-librados_hello_world_c: hello_world_c.c
-       cc -g -c hello_world_c.c -o hello_world_c.o $(CFLAGS)
-       cc -g hello_world_c.o -lrados -o librados_hello_world_c $(LDFLAGS)
+CC?=gcc
+CC_FLAGS=-Wall -Wextra -Werror -g
+CC_INC=$(LOCAL_LIBRADOS_INC)
+CC_LIBS?=-lrados
+CC_CC=$(CC) $(CC_FLAGS) $(CC_INC) $(LOCAL_LIBRADOS) $(CC_LIBS)
+
+# Relative path to the Ceph source:
+CEPH_SRC_HOME?=../../src
+
+LOCAL_LIBRADOS?=-L$(CEPH_SRC_HOME)/.libs/ -Wl,-rpath,$(CEPH_SRC_HOME)/.libs
+LOCAL_LIBRADOS_INC?=-I$(CEPH_SRC_HOME)/include
+
+all: hello_world_cpp hello_world_c
+
+# Build against the system librados instead of the one in the build tree:
+all-system: LOCAL_LIBRADOS=
+all-system: LOCAL_LIBRADOS_INC=
+all-system: all
+
+hello_world_cpp: hello_world.cc
+       $(CXX_CC) -o hello_world_cpp hello_world.cc
+
+hello_world_c: hello_world_c.c
+       $(CC_CC) -o hello_world_c hello_world_c.c
 
 clean:
-       rm hello_world.o librados_hello_world
-       rm hello_world_c.o librados_hello_world_c
+       rm -f hello_world_cpp hello_world_c
+

diff --git a/examples/librados/hello_world.readme b/examples/librados/hello_world.readme
index 54f89ac1a7deb7babeeb2599dc9a7823df92ebf2..d438f932e47f3d9692572e6546bbb511f4fdb67e 100644 (file)
--- a/examples/librados/hello_world.readme
+++ b/examples/librados/hello_world.readme
@@ -1,10 +1,14 @@
 This simple librados program can be built by running "make" (and cleaned up
 with "make clean"), assuming you have librados-dev already installed.
 
+By default, the makefile will build against the librados headers and library in your
+build tree (ie. using relative paths). If you would like to build the examples against
+your system librados and headers, use "make all-system".
+
 And executed using
 ./librados_hello_world -c ../../src/ceph.conf
 (or whatever path to a ceph.conf is appropriate to you, or
 by explicitly specifying monitors, user id, and keys).
 
 It demonstrates using librados in a non-Ceph project and the code should
-be self-explanatory.
\ No newline at end of file
+be self-explanatory.