Use Capn , Link with static libraries Failed ,But Link with dynamics libraries Success

[张小]

Hi,Kenton:

     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/lib/libcapnpc.a(schema-parser.o):schema-parser.c++:function 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

                 U capnp::SchemaLoader::getType(capnp::schema::Type::Reader, capnp::Schema) const

                 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) const

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

whutbd

[张小]

nm -C libcapnpc.a |grep SchemaLoader|grep 'get('

                 U capnp::SchemaLoader::get(unsigned long, capnp::schema::Brand::Reader, capnp::Schema) const

nm -C libcapnp.a |grep SchemaLoader|grep 'get('

0000000000004250 T capnp::SchemaLoader::get(unsigned long, capnp::schema::Brand::Reader, capnp::Schema) const

it seems SchemaLoader::get Symbol in libcapnp.a ， and in my bazel build file  like this 

cc_library(

    name = 'capnp',

    visibility = ["//visibility:public"],

    hdrs = glob([

        "include/capnp/*.h",

        "include/capnp/compat/*.h",

        "include/kj/*.h",

        "include/kj/**/*.h",

        ]),

    srcs = glob([

        "lib/libcapnpc.a",

        "lib/libcapnp.a",

        "lib/libkj.a",

        ]),

    strip_include_prefix = "include",

)

在 2019年10月11日星期五 UTC+8下午3:47:39，张小写道：

[张小]

it seems libcapn.a and libcapnc.a conflict ?

在 2019年10月11日星期五 UTC+8下午7:12:26，张小写道：

[张小]

Hi,Kenton:

  Is there a bazel  for capnp v0.7.0?

  thanks

  whutbd

在 2019年10月11日星期五 UTC+8下午3:47:39，张小写道：

Hi,Kenton:

[张小]

bazel link *.a  in   Lexicographic order,how can I change it

bazel-out/k8-fastbuild/bin/_objs/test_capn/demo/test_capn_serialize_performance.pic.o

bazel-out/k8-fastbuild/bin/_objs/test_capn/demo/full_info.capnp.pic.o

capnp/lib/libcapnp.a

capnp/lib/libcapnpc.a

capnp/lib/libkj.a

-lstdc++

-lm

在 2019年10月11日星期五 UTC+8下午7:12:26，张小写道：

[Kenton Varda]

Hi,

Sorry, I do not know how to control Bazel's linker command line order. Maybe it would help to define three separate cc_library rules for the three libraries, with the dependencies between them specified -- maybe Bazel will then recognize the dependency relationship and do the ordering correctly. But I don't know.

-Kenton

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[张小]

hi Kenton：

   Thank you very much. I've settled it.Splitting bazel-dependent libraries into three libraries，It works

   best wish

   whutbd 

在 2019年10月12日星期六 UTC+8上午1:00:26，Kenton Varda写道：

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[张小]

 A friend who has the same problem can see it.

https://groups.google.com/forum/#!searchin/capnproto/libcapnpc.a|sort:date/capnproto/_BFLFOFxLyI/tVAG-KuqUg4J

在 2019年10月13日星期日 UTC+8上午11:18:18，张小写道：