I downloaded the Libpcap-1.7.4 library . when i want to run libpcap.o and libpcap.so.1.7.4, the following errors appear:
[root#localhost libpcap-1.7.4]# ./libpcap.a
./libpcap.a: line 1: syntax error near unexpected token `newline'
./libpcap.a: line 1: `!<arch>'
[root#localhost libpcap-1.7.4]# ./libpcap.so.1.7.4
Segmentation fault (core dumped)
Could you give me some advice about what I should do?
OS: Centos 6.x
Could you give me some advice about what I should do?
Not try to run libpcap - it's a library, not a program, so you can't run it, you can only link a program with it.
What you need to do is link a program with it, and then run the program.
For example, if you have a C source file named small_sniffer.c, and you want to compile it and link it with libpcap, try
gcc -o small_sniffer small_sniffer.c -lpcap
for dynamic linking and
gcc -static -o small_sniffer small_sniffer.c -lpcap
to link entirely statically
Related
Using -fsanitizer while compiling programs helps in finding location of memory leaks easily. But how to use this with vscode.
I only know that for compiling a program in vscode through terminal we need to type in g++ file_name.cpp -o executable_name.exe and for running .\program_name
Adding -fsanitizer to this command as an argument does not work for me. How to compile your program using fsanitizer on vscode?
Edit: I have been trying to use it as
g++ -std=c++17 -O2 -Wall -fsanitize=address
tempCodeRunnerFile.cpp -o tempcodeRunnerfile.exe
But this keeps giving me some kind of error:
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lasan: No such file or directory
collect2.exe: error: ld returned 1 exit status
This is unrelated to VSCode. The problem is your platform - MinGW traditionally has poor sanitizer support.
Your MSYS2 environment, MINGW64, only supports UBSAN (with stripped-down error reporting, compile with -fsanitize=undefined -fsanitize-undefined-trap-on-error).
There's also CLANG64 environment, which does have ASAN. Install its Clang (pacman -S mingw-w64-clang-x86_64-clang), and compile using clang++ located at C:\msys64\clang64\bin. If you're compiling from MSYS2 terminal, make sure you start the right one: launch it with clang64.exe, or the "MSYS2 Clang x64" shortcut (I don't remember the exact name).
I have a wireshark plugin code which compiles and generates .so files perfectly under Ubuntu 16. This dissector was written for wireshark 1.6 and the plugin runs perfectly under wireshark 1.6.
However when I try to use this plugin for wireshark 2(or any wireshark version higher than 1.6) following errors show -
Couldn't load module
/home/th89ct/.config/wireshark/plugins/plugin-1_0_0.so:
/home/th89ct/.config/wireshark/plugins/plugin-1_0_0.so: undefined
symbol: tvb_length
Couldn't load module
/home/th89ct/.config/wireshark/plugins/plugin--1_0_0.so:
/home/th89ct/.config/wireshark/plugins/plugin--1_0_0.so: undefined
symbol: check_col
so I wanted to edit the code by replacing the methods - as after googling I've found that these methods do not belong to the new wireshark API.
but the problem is every time I edit the code - even by only putting a space in a blank space - following error appears -
*gcc -c -DHAVE_CONFIG_H -I/usr/include/wireshark -I/usr/include/glib-2.0 -I/usr/lib/i386-linux-gnu/glib-2.0/include -DINET6 -D_U_=attribute((unused)) -Wall -Wpointer-arith -g -DXTHREADS -D_REENTRANT -DXUSE_MTSAFE_API -fPIC -DPIC packet-ife.c -o packet-ife.o packet-ife.c:105:23: fatal error: epan/emem.h: No such
file or directory #include
^ compilation terminated. Makefile.linux:28: recipe for target 'packet-ife.o' failed make: *** [packet-ife.o] Error
1*
what should I do? I have no idea!!!! Thanks in advance
Your problem here is that emem was replaced with wmem starting with Wireshark 2.0. You can read more about wmem in Wireshark's README.wmem file. Naturally, there are plenty of dissectors available in Wireshark's epan/dissectors/ and plugins/*/ directories to serve as excellent examples to help you with the transition.
I was wondering if you could help me with some issues and questions I have for developing for the i.MX6 SoloX in bare-metal. I was looking at this link https://community.nxp.com/docs/DOC-106253 and downloaded the files there to use as an example of how to develop bare-metal c code for the i.MX6.
Then I setup my eclipse environment according to this tutorial https://community.nxp.com/docs/DOC-103736 but just the toolchain because I'm not interested in processor expert.
Since I'm working on Linux I didn't installed the Code Sourcery thing, instead I'm working with the gcc-arm-none-eabi which I installed using:
$ sudo apt-get install gcc-arm-none-eabi
And therefore I had to change the cs-rm and cs-make for rm and make respectively.
And I was able to create an eclipse project with the downloaded code and configure the project to make it work, nevertheless, I had the first error:
main.c:8:19: fatal error: stdio.h: No such file or directory
#include <stdio.h>
^
compilation terminated.
make: *** [cortex_A9/main.o] Error 1
cortex_A9/subdir.mk:24: recipe for target 'cortex_A9/main.o' failed
And I was able to solve it adding "/usr/include" in the include directories at project > properties. But I'm not sure if this is a correct way of solving this error.
After fixing this error I got a new one:
syscalls.c:168:1: error: unknown type name 'caddr_t'
caddr_t _sbrk(int incr)
And for solving that I had to include explicitly the file "/usr/include/x86_64-linux-gnu/sys/types.h" and also I don't know if that is the correct way to solve it.
Now having eliminated those two errors I have the following one:
Building target: imx6-A9.elf
Invoking: Cross ARM C Linker
arm-none-eabi-gcc -mcpu=cortex-a9 -march=armv7-a -marm -mlittle-endian -mfloat-abi=softfp -mfpu=neon -mno-unaligned-access -fno-zero-initialized-in-bss -O0 -g -T "/home/mmalagon/iMX6/MX6SX_hello_MFG/cortex_A9/mx6slx.ld" -nostartfiles -Wl,-Map,"imx6-A9.map" -o "imx6-A9.elf" ./cortex_A9/main.o ./cortex_A9/syscalls.o ./cortex_A9/uart.o
/usr/lib/gcc/arm-none-eabi/4.9.3/../../../arm-none-eabi/bin/ld: cannot find -lg
makefile:42: recipe for target 'imx6-A9.elf' failed
/usr/lib/gcc/arm-none-eabi/4.9.3/../../../arm-none-eabi/bin/ld: cannot find -lc
collect2: error: ld returned 1 exit status
make: *** [imx6-A9.elf] Error 1
Which I haven't been able to resolve.
I don't know if this error is a consequence of the way I solved the two previous errors.
Does anybody know how to properly setup eclipse for i.MX6 bare-metal development?
Thank you very much for helping!!
If you want to develop bare-metal code for the i.MX6SoloX without using CodeSourcery then you need to execute this:
sudo apt-get install gcc-arm-none-eabi libnewlib-arm-none-eabi -y
And then choose "Custom (arm-none-eabi-gcc)" at Project>Settings>C/C++ Build in the 'Toolchains' tab.
I am building Swift compiler from source on CentOS 6, and am running into a library issue. After fighting with the build script for a while I have got where running ./utils/build-script eventually gives:
+ /home/src/cmake-3.4.1-Linux-x86_64/bin/cmake --build /home/src/swift/build/Ninja-DebugAssert/cmark-linux-x86_64 -- all
ninja: no work to do.
llvm: using standard linker
+ cd /home/src/swift/build/Ninja-DebugAssert/llvm-linux-x86_64
+ /home/src/cmake-3.4.1-Linux-x86_64/bin/cmake -G Ninja -DCMAKE_C_COMPILER:PATH=clang -DCMAKE_CXX_COMPILER:PATH=clang++ '-DCMAKE_C_FLAGS= ' '-DCMAKE_CXX_FLAGS= ' -DCMAKE_BUILD_TYPE:STRING=Debug -DLLVM_ENABLE_ASSERTIONS:BOOL=TRUE -DLLVM_TOOL_SWIFT_BUILD:BOOL=NO '-DLLVM_TARGETS_TO_BUILD=X86;ARM;AArch64' -DLLVM_INCLUDE_TESTS:BOOL=TRUE -LLVM_INCLUDE_DOCS:BOOL=TRUE -DCMAKE_INSTALL_PREFIX:PATH=/usr -DINTERNAL_INSTALL_PREFIX=local /home/src/swift/llvm
CMake Error at cmake/modules/CheckAtomic.cmake:36 (message):
Host compiler appears to require libatomic, but cannot find it.
Call Stack (most recent call first):
cmake/config-ix.cmake:296 (include)
CMakeLists.txt:403 (include)
-- Configuring incomplete, errors occurred!
See also "/home/src/swift/build/Ninja-DebugAssert/llvm-linux-x86_64/CMakeFiles/CMakeOutput.log".
See also "/home/src/swift/build/Ninja-DebugAssert/llvm-linux-x86_64/CMakeFiles/CMakeError.log".
./utils/build-script: command terminated with a non-zero exit status 1, aborting
(gcc-4.8.2 was what I compiled llvm with)
libatomic is there:
$ locate libatomic
/opt/gcc-4.8.2/lib64/libatomic.a
/opt/gcc-4.8.2/lib64/libatomic.la
/opt/gcc-4.8.2/lib64/libatomic.so
/opt/gcc-4.8.2/lib64/libatomic.so.1
/opt/gcc-4.8.2/lib64/libatomic.so.1.0.0
I just don't know how to tell the build system where to look. I have tried the usual CMAKE_LIBRARY_PATH (exporting on the command line - I am not sure if cmake works like the way LD_LIBRARY_PATH, LIBRARY_PATH work) but it can't seem to find it.
I also don't have root on the machine.
I had not tried building from source on CentOS 6 until I saw this question, but I have been able to build Swift 2.2 on CentOS 7.1 and Ubuntu 14.04, with partial success. A few things to think about:
You will need numerous dependencies required to build Swift, and unless
they happen to be already on the system, you will need root access to
install them.
Use -R flag with the build-script to create a release build.
Building in DebugAssert (the default) will require a lot of memory. In my case even 14 GB was not sufficient. A release build
can be done with about 6 GB.
As for your specific problem, it is related to Clang's dependency on GCC-related packages for headers and libraries. See, for example, Fedora 21 with clang, without gcc.
Even if you installed GCC 4.8.2 and adjusted the path to use gcc and g++ from 4.8.2, Clang may still be looking in the old GCC directories for headers and libraries. CMake first tries to compile a C++ test file that includes the header atomic, which does not exist in the old GCC. So, it then tries to link a C test program that uses the library libatomic, which again doesn't exist in the old GCC. You can see this by looking at llvm/cmake/modules/CheckAtomic.cmake mentioned by usr1234567. CMakeError.log and CMakeOutput.log can also provide valuable insight. BTW, when I was building Swift on CentOS 7.1, I didn't run into this problem because GCC 4.8.2 was used by Clang for headers and libraries and the atomic header was found, so the C++ file got compiled. However, had the libatomic check been done, it would have failed, because libatomic.so in the repository-provided 4.8.2 has INPUT ( <name of some non-existent file> ), so trying to link with libatomic errors out.
I'm sure there are various ways of dealing with this issue, but what solved the problem for me was setting the following environment variables, please adjust to your specific setup:
export CPLUS_INCLUDE_PATH=/opt/gcc-4.8.2/include/c++/4.8.2:/opt/gcc-4.8.2/include/c++/4.8.2/x86_64-unknown-linux-gnu
export LIBRARY_PATH=/opt/gcc-4.8.2/lib64:/opt/gcc-4.8.2/lib/gcc/x86_64-unknown-linux-gnu/4.8.2
Also make sure that your 4.8.2 version of libstdc++.so is available to the dynamic linker at runtime. Since you don't have root, do
export LD_LIBRARY_PATH=/opt/gcc-4.8.2/lib64
If you had root, you could use ldconfig.
Before you start building Swift, you may want to try building, using Clang, a simple C program linking it with libatomic (the code doesn't actually have to use any symbols from the lib) and a simple C++ program that includes the <atomic> header. When compiling the C++ program, use the -std=c++11 compiler flag. If the C++ program compiles successfully, then it is not necessary for the libatomic linking test to be successful.
Interestingly, the CMakeOutput.log file still did not report finding GCC 4.8.2 as a candidate GCC installation, but the configuration/build worked well past the error.
Hopefully this helps. Please let us know if you run into something else.
CheckAtomic.cmake seems to be part of LLVM. I found a file at Github and it tries to find '__atomic_fetch_add_4' from libatomic
check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_LIBATOMIC)
This fails for you. Check CMakeFiles/CMakeError.log to get more details why this test failed. Or try this line in a new project.
I know this issue already discussed (include there), and no one time. But, unfortunately, I cannot solve this problem.
So, I have OS X Lion, i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1, and I try to build gcc-4.7.0.
First of all, I've already built this compiler on Debian GNU/Linux, so I was sure any problems will not be...
So, I read this GCC manual and I did all exactly as described:
cd gcc-4.7.0
./contrib/download_prerequisites
cd ..
mkdir gcc_build
cd gcc_build
/Users/dshevchenko/Downloads/gcc-4.7.0/configure --prefix=/Users/dshevchenko/Tools/GCC
make
So, MPC, MPFR and GMP was successfully downloaded, and ./configure was OK. But after few minutes after make I get this error:
checking for suffix of object files... configure: error:
in `/Users/dshevchenko/Downloads/gcc_build/x86_64-apple-darwin11.4.0/libgcc':
configure: error: cannot compute suffix of object files: cannot compile
See `config.log' for more details.
As I understand this can't be due error of dynamic linking with MPFR, MPC or GMP, because these libs was built inside of GCC source code tree.
In my ~/.bash_profile:
export DYLD_LIBRARY_PATH=/Users/dshevchenko/Tools/GCC/lib
Help me please, I'll be grateful for any advice.
Be sure you have the latest Xcode (4.4 at the time of this writing). There is a bug in the llvm compiler in some versions of Xcode (including 4.1, which I had). For Xcode 4.4, the command line tools must be downloaded from the Xcode preferences.
the follow solution helped me out:
$ export CC="gcc -D_FORTIFY_SOURCE=0”
$ $srcdir/configure ...
$ make
source: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50342