undefined reference when linking V8

Question

I'm strugling to compile a really small example with V8..

cpp program is this:

#include "v8.h"

int main()
{
     v8::HandleScope handle_scope;

     return 0;
}

Compile line: g++ -I/home/lterje/git/tengine/Externals/v8/include /home/lterje/git/tengine/Externals/v8/out/ia32.release/obj.target/tools/gyp/libv8_snapshot.a test.cpp -o test -lpthread

Error I'm getting:

/tmp/ccHYtJuE.o: In function `main':
test.cpp:(.text+0x11): undefined reference to `v8::HandleScope::HandleScope()'
test.cpp:(.text+0x22): undefined reference to `v8::HandleScope::~HandleScope()'
collect2: error: ld returned 1 exit status

What exactly is the difference between the base, snapshot and no snapshot library files? I've tried linking with each of them, but none of them works :/

how do you link againest these libraries? do you have a CMakeLists.txt file?can you include that — Moataz Elmasry
– Moataz Elmasry, Commented Feb 25, 2013 at 16:21
developers.google.com/v8/get_started If you look at the bottom there and point 3, it seams like you can just give the full path like they do there? — bitgregor
– bitgregor, Commented Feb 25, 2013 at 16:30
You need to download and install the v8 libraries and if you installed them on a defuault path, like /usr/local/lib etc... then it sufficies to link againest them using -llibv8 or -lv8 or something. did you do that? — Moataz Elmasry
– Moataz Elmasry, Commented Feb 25, 2013 at 16:35
as you see from the compile line I've downloaded it into a folder and I've built it with gyp.. they're not linking to v8 on the link I posted above? I don't even think libv8 exists anymore.. its libv8_base.a , libv8_snapshot.a and libv8_nosnapshot.a as I mentioned above.. have you built it before and if so, what is the line you are building with? — bitgregor
– bitgregor, Commented Feb 25, 2013 at 16:40
You're not following the instructions. The .a files need to go after your source files on the command line. — Mat
– Mat, Commented Feb 25, 2013 at 17:24

ChenClock · Accepted Answer · 2013-10-30 12:08:50Z

2

first I have to say sorry for my poor english. I have just link the .a file to my own project. There's ld error because of the dependencies of the libv8_snapshot.a is not been given.

This is my compile statement:

g++ -o xxxxx -I ~v8/out/native/obj.target/tools/gyp/libv8_{base.native,snapshot}.a ~v8/out/native/obj.target/third_party/icu/libicu{data,i18n,snapshot}.a ~v8/out/native/obj.target/icudata/third_party/icu/linux/icudt46_dat.o -lrt -lpthread

I think that the libv8_base.native.a libv8_snapshot.a is dependend on icu and icudt46 files and thereis some functions about unix clock_time is dependend on "rt", so add "-lrt"

Hope helpful for you all~ As a Chinese,sorry for my english.

answered Oct 30, 2013 at 12:08

ChenClock

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Employed Russian · Accepted Answer · 2013-02-28 02:47:13Z

0

Compile line:
g++ -I/home/lterje/git/tengine/Externals/v8/include /home/lterje/git/tengine/Externals/v8/out/ia32.release/obj.target/tools/gyp/libv8_snapshot.a test.cpp -o test -lpthread

This link line is incorrect. Try this instead:

g++ -I/home/lterje/git/tengine/Externals/v8/include \
  test.cpp -o test \
  /home/.../obj.target/tools/gyp/libv8_snapshot.a \
  -lpthread

Read this to understand why the order matters.

answered Feb 28, 2013 at 2:47

Employed Russian

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