jmckaskill / c-capnproto Goto Github PK

The following line of test.capnp.c generates a compiler error:

static const struct capn_segment capn_seg = {{0},0,0,0,(char*)&capn_buf[0],8168,8168};

johan@johanpc:~/git/c-capnproto$ make
cc -O2 -Wall -fPIC --std=gnu11 -I. -Wno-unused-function -c compiler/test.capnp.c -o compiler/test.capnp.o
compiler/test.capnp.c:1028:21: warning: initialization makes integer from pointer without a cast [enabled by default]
static const struct capn_segment capn_seg = {{0},0,0,0,(char*)&capn_buf[0],8168,8168};
^
compiler/test.capnp.c:1028:21: warning: (near initialization for ‘capn_seg.id’) [enabled by default]
compiler/test.capnp.c:1028:21: error: initializer element is not computable at load time
compiler/test.capnp.c:1028:21: error: (near initialization for ‘capn_seg.id’)
compiler/test.capnp.c:1028:21: warning: initialization makes pointer from integer without a cast [enabled by default]
compiler/test.capnp.c:1028:21: warning: (near initialization for ‘capn_seg.data’) [enabled by default]

Hello,

I am new to the world of installing C libraries and I am having the task of installing capnp C libraries using g++ v4.8 in our RHEL6 environment.

I downloaded the source from https://github.com/jmckaskill/c-capnproto and ran make which gave me the below error.

~/tmp/c-capnproto-master $ env CC=/opt/rh/devtoolset-2/root/usr/bin/gcc CXX=/opt/rh/devtoolset-2/root/usr/bin/g++ make
/opt/rh/devtoolset-2/root/usr/bin/gcc -O2 -Wall -Werror -fPIC -I. -Wno-unused-function -c capn.c -o capn.o
capn.c: In function \u2018lookup_segment\u2019:
capn.c:221:19: error: \u2018y\u2019 may be used uninitialized in this function [-Werror=maybe-uninitialized]
s->hdr.parent = &y->hdr;
^
capn.c:222:6: error: \u2018x\u2019 may be used uninitialized in this function [-Werror=maybe-uninitialized]
x = &s->hdr;
^
cc1: all warnings being treated as errors
make: ** [capn.o] Error 1

From #4, I understood that this fixed now and hence I downloaded the new code from flashforward branch and ran make.

Then, it was failing as gtest library wasn't available. I followed the steps in http://stackoverflow.com/questions/13513905/how-to-setup-googletest-as-a-shared-library-on-linux to install the gtest library and now it's failing with the below error.

~/tmp/c-capnproto-flashforward $ env CC=/opt/rh/devtoolset-2/root/usr/bin/gcc CXX=/opt/rh/devtoolset-2/root/usr/bin/g++ make
/opt/rh/devtoolset-2/root/usr/bin/g++ -g -Wall -Werror -I. -I../gtest/include -o capn-test.o -c capn-test.cpp
In file included from capn-test.cpp:7:0:
capn-malloc.c: In function \u2018int init_fp(capn_, FILE_, capn_stream_, int)\u2019:
capn-malloc.c:114:28: error: \u2018UINT32_MAX\u2019 was not declared in this scope
if (n > INT_MAX/8 || n > UINT32_MAX/8 || UINT32_MAX - total < n_8)
^
In file included from /usr/include/gtest/gtest.h:1929:0,
from capn-test.cpp:1:
capn-test.cpp: In member function \u2018virtual void WireFormat_SimpleRawDataStruct_Test::TestBody()\u2019:
capn-test.cpp:54:40: error: \u2018UINT64_C\u2019 was not declared in this scope
EXPECT_EQ(UINT64_C(0xefcdab8967452301), capn_read64(ptr, 0));
^
capn-test.cpp:54:3: error: template argument 1 is invalid
EXPECT_EQ(UINT64_C(0xefcdab8967452301), capn_read64(ptr, 0));
^
capn-test.cpp:55:23: error: \u2018UINT64_C\u2019 was not declared in this scope
EXPECT_EQ(UINT64_C(0), capn_read64(ptr, 8));
^
capn-test.cpp:55:3: error: template argument 1 is invalid
EXPECT_EQ(UINT64_C(0), capn_read64(ptr, 8));
^
capn-test.cpp:56:32: error: \u2018UINT32_C\u2019 was not declared in this scope
EXPECT_EQ(UINT32_C(0x67452301), capn_read32(ptr, 0));
^
capn-test.cpp:56:3: error: template argument 1 is invalid
EXPECT_EQ(UINT32_C(0x67452301), capn_read32(ptr, 0));
^
capn-test.cpp:57:32: error: \u2018UINT32_C\u2019 was not declared in this scope
EXPECT_EQ(UINT32_C(0xefcdab89), capn_read32(ptr, 4));
^
capn-test.cpp:57:3: error: template argument 1 is invalid
EXPECT_EQ(UINT32_C(0xefcdab89), capn_read32(ptr, 4));
^
capn-test.cpp:58:23: error: \u2018UINT32_C\u2019 was not declared in this scope
EXPECT_EQ(UINT32_C(0), capn_read32(ptr, 8));
^
capn-test.cpp:58:3: error: template argument 1 is invalid
EXPECT_EQ(UINT32_C(0), capn_read32(ptr, 8));
^
capn-test.cpp:59:28: error: \u2018UINT16_C\u2019 was not declared in this scope
EXPECT_EQ(UINT16_C(0x2301), capn_read16(ptr, 0));
^
capn-test.cpp:59:3: error: template argument 1 is invalid
EXPECT_EQ(UINT16_C(0x2301), capn_read16(ptr, 0));
^
capn-test.cpp:60:28: error: \u2018UINT16_C\u2019 was not declared in this scope
EXPECT_EQ(UINT16_C(0x6745), capn_read16(ptr, 2));
^
capn-test.cpp:60:3: error: template argument 1 is invalid
EXPECT_EQ(UINT16_C(0x6745), capn_read16(ptr, 2));
^
capn-test.cpp:61:28: error: \u2018UINT16_C\u2019 was not declared in this scope
EXPECT_EQ(UINT16_C(0xab89), capn_read16(ptr, 4));
^
capn-test.cpp:61:3: error: template argument 1 is invalid
EXPECT_EQ(UINT16_C(0xab89), capn_read16(ptr, 4));
^
capn-test.cpp:62:28: error: \u2018UINT16_C\u2019 was not declared in this scope
EXPECT_EQ(UINT16_C(0xefcd), capn_read16(ptr, 6));
^
capn-test.cpp:62:3: error: template argument 1 is invalid
EXPECT_EQ(UINT16_C(0xefcd), capn_read16(ptr, 6));
^
capn-test.cpp:63:23: error: \u2018UINT16_C\u2019 was not declared in this scope
EXPECT_EQ(UINT16_C(0), capn_read16(ptr, 8));
^
capn-test.cpp:63:3: error: template argument 1 is invalid
EXPECT_EQ(UINT16_C(0), capn_read16(ptr, 8));
^
capn-test.cpp: In function \u2018void setupStruct(capn_)\u2019:
capn-test.cpp:77:64: error: \u2018UINT64_C\u2019 was not declared in this scope
EXPECT_EQ(0, capn_write64(ptr, 0, UINT64_C(0x1011121314151617)));
^
capn-test.cpp:78:56: error: \u2018UINT32_C\u2019 was not declared in this scope
EXPECT_EQ(0, capn_write32(ptr, 8, UINT32_C(0x20212223)));
^
capn-test.cpp:79:53: error: \u2018UINT16_C\u2019 was not declared in this scope
EXPECT_EQ(0, capn_write16(ptr, 12, UINT16_C(0x3031)));
^
capn-test.cpp: In function \u2018void checkStruct(capn_)\u2019:
capn-test.cpp:156:40: error: \u2018UINT64_C\u2019 was not declared in this scope
EXPECT_EQ(UINT64_C(0x1011121314151617), capn_read64(ptr, 0));
^
capn-test.cpp:156:3: error: template argument 1 is invalid
EXPECT_EQ(UINT64_C(0x1011121314151617), capn_read64(ptr, 0));
^
capn-test.cpp:157:32: error: \u2018UINT32_C\u2019 was not declared in this scope
EXPECT_EQ(UINT32_C(0x20212223), capn_read32(ptr, 8));
^
capn-test.cpp:157:3: error: template argument 1 is invalid
EXPECT_EQ(UINT32_C(0x20212223), capn_read32(ptr, 8));
^
make: *** [capn-test.o] Error 1

Any thoughts on this? Please let me know if I am missing something here.

-Ram

I started looking into updating to the current capnp version 0.5.3, and found that the existing capnpc-c plugin was failing to regenerate compiler/schema.{c|h} based on the current schema.capnp from upstream capnproto. I suspect it may be because the format of schema.capnp has changed, and capnpc-c can't process the new format with its older generated struct/enum defs.

Wondering if you'd recommend a manual fixup of compiler/schema.{c|h} or if you've used a more efficient strategy in the past - couldn't quite tell from the git history.

Also, not sure if you're still interested in receiving questions/pull requests on this repo, as I saw your msgs on the capnproto discuss list that you wouldn't have much time for your go implementation any more. If not, I'll just plug along on my clone of the repo :)

Using gcc 4.7.3

capn.c: In function ‘lookup_segment’:
capn.c:221:19: error: ‘y’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
capn.c:222:6: error: ‘x’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
cc1: all warnings being treated as errors
Makefile:13: recipe for target 'capn.o' failed

cat ../capnproto/c++/samples/addressbook.capnp | ./capnpc-c 
failed to read schema from stdin

Is there a how to use the program? Or isn't it finished?