Statically link when all deps have static libs

Change-Id: Iae8748a2a7cf25731859aa006ff2353ee91d05b1

README

 The opensource version of baidu-rpc
 # BUILD
 ### Ubuntu/LinuxMint/WSL
-**install deps**  
-Common: sudo apt-get install git g++ make  
-gflags: sudo apt-get install libgflags-dev  
-protobuf: sudo apt-get install libprotobuf-dev libprotoc-dev protobuf-compiler  
-leveldb(used by rpcz): sudo apt-get install libleveldb-dev libsnappy-dev  
-openssl(for https): libssl-dev  
+**install common deps**  
+Including: git g++ make libssl-dev
+**install gflags protobuf leveldb**
+Including: libgflags-dev libprotobuf-dev libprotoc-dev protobuf-compiler libleveldb-dev  
+If you need to statically link leveldb, install libsnappy-dev as well.
 **compile**  
 git clone this repo. cd into the repo and run: sh config_brpc.sh --headers=/usr/include --libs=/usr/lib  
-**run echo example**  
+**run example**  
 cd into example/echo_c++, make, run echo_server and echo_client  
 **run examples with cpu/heap profilers**  
-sudo apt-get install libgoogle-perftools-dev libunwind-dev liblzma-dev  
-Rerun config_brpc.sh  
+Install libgoogle-perftools-dev and re-run config_brpc.sh before compiling
 **compile tests**  
 Install gmock and gtest, use the gtest embedded in gmock and don't install libgtest-dev  
 sudo apt-get install google-mock; cd /usr/src; sudo cmake .; sudo make; sudo mv lib*.a gtest/lib*.a /usr/lib; sudo mv gtest/include/gtest /usr/include/  
@@ -30,6 +28,7 @@ Rerun config_brpc.sh
 
 # Supported deps:
 GCC: 4.8-7.1  
+Clang: 3.5-4.0
 glibc: 2.12-2.25  
 protobuf: 2.4-3.2  
 gflags: 2.0-2.21  

config_brpc.sh

@@ -47,7 +47,7 @@ if [ -z "$HDRS_IN" ] || [ -z "$LIBS_IN" ]; then
 fi
 
 find_dir_of_lib() {
-    local lib=$(find ${LIBS_IN} -name "lib${1}.a" -o -name "lib${1}.so*" | head -n1)
+    local lib=$(find ${LIBS_IN} -name "lib${1}.a" -o -name "lib${1}.so" | head -n1)
     if [ ! -z "$lib" ]; then
         dirname $lib
     fi
@@ -114,13 +114,10 @@ PROTOBUF_LIB=$(find_dir_of_lib_or_die protobuf)
 append_linking $PROTOBUF_LIB protobuf
 
 LEVELDB_LIB=$(find_dir_of_lib_or_die leveldb)
-if [ -f $LEVELDB_LIB/libleveldb.a ]; then
-	STATIC_LINKINGS="$STATIC_LINKINGS -lleveldb"
-	# required by leveldb
-	SNAPPY_LIB=$(find_dir_of_lib snappy)
-	if [ ! -z "$SNAPPY_LIB" ]; then
-		append_linking $SNAPPY_LIB snappy
-	fi
+# required by leveldb
+SNAPPY_LIB=$(find_dir_of_lib snappy)
+if [ -f $LEVELDB_LIB/libleveldb.a ] && [ -f $SNAPPY_LIB/libsnappy.a ]; then
+	STATIC_LINKINGS="$STATIC_LINKINGS -lleveldb -lsnappy"
 else
 	DYNAMIC_LINKINGS="$DYNAMIC_LINKINGS -lleveldb"
 fi
@@ -206,21 +203,18 @@ else
     append_to_output_libs "$TCMALLOC_LIB" "    "
     TCMALLOC_HDR=$(find_dir_of_header_or_die google/profiler.h)
     append_to_output_headers "$TCMALLOC_HDR" "    "
-    append_to_output_linkings $TCMALLOC_LIB tcmalloc_and_profiler "    "
-    if [ $STATICALLY_LINKED_tcmalloc_and_profiler -gt 0 ]; then
-        # required by tcmalloc('s profiler)
-        UNWIND_LIB=$(find_dir_of_lib unwind)
-        if [ ! -z "$UNWIND_LIB" ]; then
-            append_to_output_libs $UNWIND_LIB "    "
-            append_to_output_linkings $UNWIND_LIB unwind "    "
-            if [ $STATICALLY_LINKED_unwind -gt 0 ]; then
-                # required by libunwind
-                LZMA_LIB=$(find_dir_of_lib lzma)
-                if [ ! -z "$LZMA_LIB" ]; then
-                    append_to_output_linkings $LZMA_LIB lzma "    "
-                fi
-            fi
-        fi
+    # required by tcmalloc('s profiler)
+    UNWIND_LIB=$(find_dir_of_lib unwind)
+    # required by libunwind
+    LZMA_LIB=$(find_dir_of_lib lzma)
+    if [ -f $TCMALLOC_LIB/libtcmalloc_and_profiler.a ] && \
+        [ -f $UNWIND_LIB/libunwind.a ] && \
+        [ -f $LZMA_LIB/liblzma.a ]; then
+        append_to_output_libs "$UNWIND_LIB" "    "
+        append_to_output_libs "$LZMA_LIB" "    "
+        append_to_output "    STATIC_LINKINGS+=-ltcmalloc_and_profiler -lunwind -llzma"
+    else
+        append_to_output "    DYNAMIC_LINKINGS+=-ltcmalloc_and_profiler"
     fi
 fi
 append_to_output "endif"