I like capnp,  I use Capn ,Link with static libraries( use .a) Failed 
,Error Like this

ERROR: xxxxx/BUILD:6:1: Linking of rule '//:test_capn' failed (Exit 1)
capnp::ParsedSchema::findNested(kj::StringPtr) const: error: undefined 
reference to 'capnp::SchemaLoader::get(unsigned long, 
capnp::schema::Brand::Reader, capnp::Schema) const'

but the libcapnpc.a has the “SchemaLoader::get” Symbol like this: 
nm capnp/lib/libcapnpc.a |grep SchemaLoader|grep get
                 nm -C lib/libcapnpc.a |grep SchemaLoader|grep get
                 U capnp::SchemaLoader::get(unsigned long, 
capnp::schema::Brand::Reader, capnp::Schema) const
capnp::SchemaLoader::getType(capnp::schema::Type::Reader, capnp::Schema) 
                 U capnp::SchemaLoader::get(unsigned long, 
capnp::schema::Brand::Reader, capnp::Schema) const

 capnp/lib$ ll -rth
总用量 8.4M
-rw-r--r-- 1 mulou mulou 1.1M 9月  27 15:08 libcapnp.a
-rw-r--r-- 1 mulou mulou 1.4M 9月  27 15:08 libcapnpc.a
-rw-r--r-- 1 mulou mulou 330K 9月  27 15:08 libcapnp-json.a
-rw-r--r-- 1 mulou mulou 2.0M 9月  27 15:08 libcapnp-rpc.a
-rw-r--r-- 1 mulou mulou 941K 9月  27 15:08 libkj.a
-rw-r--r-- 1 mulou mulou 1.2M 9月  27 15:08 libkj-async.a
-rw-r--r-- 1 mulou mulou  70K 9月  27 15:08 libkj-test.a
-rw-r--r-- 1 mulou mulou 1.5M 9月  27 15:08 libkj-http.a

*I try to link it with dynamic libraries,it works *

*nm -C lib-old/libcapnpc.so |grep SchemaLoader|grep get*
*                 U capnp::SchemaLoader::get(unsigned long, 
capnp::schema::Brand::Reader, capnp::Schema) const*
*                 U 
capnp::SchemaLoader::getType(capnp::schema::Type::Reader, capnp::Schema) 

*But I want to use static libraries instead of dynamic libraries because 
dynamic libraries are a little cumbersome to deploy. *

*I  install the capn **libraries**  like this :*

curl -O https://capnproto.org/capnproto-c++-0.7.0.tar.gz tar zxf 
capnproto-c++-0.7.0.tar.gz cd capnproto-c++-0.7.0 ./configure make -j6 
check sudo make install

All the best

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