I'm trying to build pcre2 statically on Windows 10 using cmake. The steps I've taken are:
md C:\ProgramData\ThirdParty\installed\pcre2
md pcre2
curl https://ftp.pcre.org/pub/pcre/pcre2-10.35.tar.gz -o tmp.tar.gz
tar -xf tmp.tar.gz -C pcre2 --strip-components=1
cd pcre2
md build
cd build
cmake .. -DCMAKE_INSTALL_PREFIX="C:\ProgramData\ThirdParty\installed\pcre2" -DBUILD_SHARED_LIBS=OFF -DPCRE2_STATIC=ON -DPCRE2_BUILD_TESTS=OFF -DZLIB_LIBRARY="C:\ProgramData\ThirdParty\installed\zlib\lib\zlibstatic.lib"
cmake --build . --config Release --target install
Despite these settings that should if I understand correctly build a static library I get unresolved external symbol errors when trying to link against pcre2-8.lib, I also include pcre2-posix.lib for good measure.
Using DUMPBIN /SYMBOLS to look at both lib files there are external symbols that I'm guessing point to pcre2-8.dll in the bin directory of the build output.
Is it possible to get pcre2-8.lib to have no external references?
Thanks in advance for your time.
It is already static. Just define the macro-name PCRE2_STATIC before #include "pcre2.h" in the project where the library is going to be used.
like this:
#define PCRE2_STATIC
#define PCRE2_CODE_UNIT_WIDTH 8
#include "pcre2.h"
Related
First we build libssh2 with the WinCNG backend using msvc:
cmake . -DCRYPTO_BACKEND=WinCNG -DCMAKE_BUILD_TYPE=Release -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=%LIBSSH2%
cmake --build . --target install
libgit2 docs say all we have to do is to set DEMBED_SSH_PATH, although it fails to mentation what to set it to. Maybe it's so obvious that it seems irrelevant. However: I'm not a C guy and have no clue of the cmake build process. From what I understand the folder where the result of the previous built resides with all it's subfolders such as include and bin should be the correct path, so using %LIBSSH2% should be fine.
When finally trying to build libgit2 running
cmake . -DBUILD_CLAR=OFF -DCMAKE_BUILD_TYPE=Release -DEMBED_SSH_PATH=%LIBSSH2% -DCMAKE_INSTALL_PREFIX="%LIBGIT2%"
cmake --build . --target install
It'll fail because it's unable to find the links to the header files / binaries. We see things along the line of:
error LNK2019: unresolved external symbol libssh2_init referenced in function
I already tried replacing the paths backslashes \ with normal slashes /, since this seems to be a common issue. I also tried explicitly setting
set CMAKE_INCLUDE_PATH=%LIBSSH2%/include
set CMAKE_LIBRARY_PATH=%LIBSSH2%/lib
both faild with the same result.
Can anyone provide a reproducible way to compile libgit2 with embedded libssh2?
Using EMBED_SSH_PATH means libssh2 sources will be compiled at the same time as libgit2s. This means you don't actually have to compile libssh2 at all.
I managed to get it to compile successfully by downloading the source for libssh2 and libgit2, then running the following commands:
cd libgit2
mkdir build
cd build
cmake .. -DBUILD_CLAR=OFF -DCMAKE_BUILD_TYPE=Release -DEMBED_SSH_PATH="C:/path-to-ssh/libssh2" -DCMAKE_INSTALL_PREFIX="%LIBGIT2%"
cmake --build . --target install
Internally, it looks for all files that match ${EMBED_SSH_PATH}/src/*.cif EMBED_SSH_PATH is set.
As for using WinCNG as the backend, using embedded SSH creates this file (libssh2_config.h) in the libssh2 directory:
#define HAVE_WINCNG
#define LIBSSH2_WINCNG
#include "../win32/libssh2_config.h"
I assume that means it is already the default backend for an embedded install.
This question already has answers here:
Why does the order in which libraries are linked sometimes cause errors in GCC?
(9 answers)
Closed 2 years ago.
Essentially I am trying to use the redland rdf libraries but I cannot link to them. When I try a simple basic program which uses the redland libraries I get these errors:
/usr/local/lib/librdf.a(rdf_init.o): In function `librdf_free_memory':
/home/ciaran/Software/redland/redland-1.0.17/src/rdf_init.c:671: undefined reference to `raptor_free_memory'
/usr/local/lib/librdf.a(rdf_init.o): In function `librdf_alloc_memory':
/home/ciaran/Software/redland/redland-1.0.17/src/rdf_init.c:689: undefined reference to `raptor_alloc_memory'
/usr/local/lib/librdf.a(rdf_init.o): In function `librdf_calloc_memory':
/home/ciaran/Software/redland/redland-1.0.17/src/rdf_init.c:707: undefined reference to `raptor_calloc_memory'
At first glance, you might just think I have a missing link library, which is what I thought until I inspected further (see below), however, the libraries are all accounted for.
A proper minimal working example is difficult in this instance because it requires getting and building the libraries that I'm trying to use. However, I've created a GitHub repository
$ git clone git#github.com:CiaranWelsh/RedlandBuildTest.git
that contains the source files necessary for building the Redland libraries as well as the example code I'm using (which breaks).
In order to build the libraries, you will also need
$ sudo apt install automake autoconf libtool gtk-doc-tools
$ sudo apt install libxml2 libxml2-dev libxslt libxslt-dev libcurl4-openssl-dev libltdl-dev
Note, I'm working on Ubuntu-18.04 on windows subsystem for Linux.
To get, build and install the libraries I'm using these terminal commands:
#raptor2
wget "http://download.librdf.org/source/raptor2-2.0.15.tar.gz"
tar -xvf raptor2-2.0.15.tar.gz
cd raptor2-2.0.15
./autogen.sh
make
sudo make install
# redland (librdf)
wget "http://download.librdf.org/source/redland-1.0.17.tar.gz"
tar -xvf redland-1.0.17.tar.gz
cd redland-1.0.17
./autogen.sh
make
sudo make install
# rasqal
wget "http://download.librdf.org/source/rasqal-0.9.33.tar.gz"
tar -xvf rasqal-0.9.33.tar.gz
cd rasqal-0.9.33
./autogen.sh
make
sudo make install
Which are available in the github repository as shell scripts (get-raptor.sh, get-rasqal.sh and get-librdf.sh).
And my minimal CMake script (also in the repository):
cmake_minimum_required(VERSION 3.15)
project(RedlandBuildTest)
set(CMAKE_CXX_STANDARD 14)
find_library(RAPTOR2_STATIC_LIBRARY
NAMES libraptor2.a
PATHS /usr/local/lib
)
find_path(RAPTOR2_INCLUDE_DIR
NAMES raptor2.h
PATHS /usr/local/include/raptor2
)
find_library(RASQAL_STATIC_LIBRARY
NAMES librasqal.a
PATHS /usr/local/lib
)
find_path(RASQAL_INCLUDE_DIR
NAMES rasqal.h
PATHS /usr/local/include/rasqal
)
find_library(LIBRDF_STATIC_LIBRARY
NAMES librdf.a
PATHS /usr/local/lib
)
find_path(LIBRDF_INCLUDE_DIR
NAMES librdf.h
PATHS /usr/local/include
)
add_executable(RedlandBuildTest main.c)
target_include_directories(RedlandBuildTest PRIVATE
${RAPTOR2_INCLUDE_DIR}
${RASQAL_INCLUDE_DIR}
${LIBRDF_INCLUDE_DIR}
)
target_link_libraries(RedlandBuildTest PRIVATE
${RAPTOR2_STATIC_LIBRARY}
${RASQAL_STATIC_LIBRARY}
${LIBRDF_STATIC_LIBRARY}
curl
xml2
xslt
ltdl
)
get_target_property(LINK_LIBRARIES RedlandBuildTest LINK_LIBRARIES)
get_target_property(INCLUDE_DIRECTORIES RedlandBuildTest INCLUDE_DIRECTORIES)
message(STATUS "
LINK_LIBRARIES ${LINK_LIBRARIES}
INCLUDE_DIRECTORIES ${INCLUDE_DIRECTORIES}
")
message(STATUS "
RAPTOR2_STATIC_LIBRARY ${RAPTOR2_STATIC_LIBRARY}
RAPTOR2_INCLUDE_DIR ${RAPTOR2_INCLUDE_DIR}
RASQAL_STATIC_LIBRARY ${RASQAL_STATIC_LIBRARY}
RASQAL_INCLUDE_DIR ${RASQAL_INCLUDE_DIR}
LIBRDF_STATIC_LIBRARY ${LIBRDF_STATIC_LIBRARY}
LIBRDF_INCLUDE_DIR ${LIBRDF_INCLUDE_DIR}
")
And the output of the CMake command:
#(looks good)
LINK_LIBRARIES /usr/local/lib/libraptor2.a;/usr/local/lib/librasqal.a;/usr/local/lib/librdf.a;curl;xml2;xslt;ltdl
INCLUDE_DIRECTORIES /usr/local/include/raptor2;/usr/local/include/rasqal;/usr/local/include
RAPTOR2_STATIC_LIBRARY /usr/local/lib/libraptor2.a
RAPTOR2_INCLUDE_DIR /usr/local/include/raptor2
RASQAL_STATIC_LIBRARY /usr/local/lib/librasqal.a
RASQAL_INCLUDE_DIR /usr/local/include/rasqal
LIBRDF_STATIC_LIBRARY /usr/local/lib/librdf.a
LIBRDF_INCLUDE_DIR /usr/local/include
To build, I'm using CLion which just does this in the background:
mkdir build && cd build
CMake ..
make
Thus giving me linker errors. I have dug a little deeper by using nm to inspect the contents of the Redland libraries.
$nm -A librdf.a > librdf.a.nmoutput.txt
$nm -A libraptor2.a > libraptor2.a.nmoutput.txt
$nm -A librasqal.a > librasqal.a.nmoutput.txt
The first offending undfined reference error
/usr/local/lib/librdf.a(rdf_init.o): In function `librdf_free_memory':
/home/ciaran/Software/redland/redland-1.0.17/src/rdf_init.c:671: undefined reference to `raptor_free_memory'
is in function librdf_free_memory, which is a defined reference inside librdf.a
# librdf.a.nmoutput.txt
...
librdf.a:rdf_init.o:0000000000000740 T librdf_free_memory
...
When we look for the undefined reference to raptor_free_memory, we se that it is indeed undefined inside librdf.a..
#librdf.a.nmoutput.txt
...
librdf.a:rdf_init.o: U raptor_free_memory
...
But this should be in libraptor2.a anyway, and if we look we see that it is indeed there and defined as it should be:
# libraptor2.a.nmoutput.txt
...
libraptor2.a:raptor_general.o:0000000000000863 T raptor_free_memory
...
My understanding is that the process of linking should essentially fill the undefined reference inside librdf.a with the definition inside libraptor.a, but this clearly is not happening.
Why is this happening?
When your static libraries have dependencies on each other, the link order matters (see this response).
If librdf depends on the libraptor library (as indicated by the link error), the libraptor library should be listed after librdf when specified to the linker. Try re-arranging the list of libraries in your target_link_libraries() command to adhere to this ordering, based on your library dependencies.
Its been a While that I tried to build clang from source code.
I tried with 2 platforms
a> Ubuntu
b> Windows
I am following the link http://clang.llvm.org/docs/LibASTMatchersTutorial.html
Ubuntu
$ mkdir build
$ cd build
$ cmake -GNinja -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ /path/to/source/llvm
After this in build directory ninja.build files generated along with some more folder
$ ninja after this command inside build directory bin folder can be seen and it contains all the clang executables clang,clang++,clang-check and many more.
Windows
I tried every option that is available to build clang from source
I am trying on developer command prompt and also I am having VS Express edition
> mkdir build
> cd build
> cmake -GNinja -DCMAKE_BUILD_TYPE=release -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ path-to-llvm
It throws error
Host compiler appears to require libatomic,but cannot find it.
So I tried in the another way by making DCMAKE_CXX_COMPILER and DCMAKE_C_COMPILER as clang-cl.exe
> cmake -GNinja -DCMAKE_BUILD_TYPE=release -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra" -DCMAKE_C_COMPILER=clang-cl.exe -DCMAKE_CXX_COMPILER=clang-cl.exe path-to-llvm
It didnt show any error at first but later while building
atlbase.h file not found
Why it is that much difficult to build clang from source on windows.?
Is this the correct procedure that I am doing?
Kindly help with any solution.
I get this error when I'm using Cygwin on a "makefile":
"boost/filesystem.hpp: No such file or directory compilation terminated."
This is everything that's inside the "makefile":
mnisten: src/main.cpp g++ -Wall -O2 -lboost_filesystem-mt -std=c++0x -o mnisten src/main.cpp
And inside the "main.cpp" file, this is the line of code that the error message is referring to:
#include <boost/filesystem.hpp>
First I tried to put the "boost" folder (containing "filesystem.hpp") inside the "src" folder, but the error message was unchanged, I still got the same error message.
Then I changed the "include" code inside "main.cpp" to:
#include <filesystem.hpp>
I also copied the "filesystem.hpp" file into the root of the "src" folder, and surprisingly this worked. I got a new error, but I got past the "include" part.
I find it very confusing that it I get an error when the file is in a folder, but when it is in the root of the "src" folder it works.
Any suggestions on how I can get it to work when the file is inside the "boost" folder?
(I downloaded the the "filesystem.hpp" since it was not included)
To find the cygwin package that contains a given file you can use cygcheck -p
$ cygcheck -p boost/filesystem.hpp
Found 6 matches for boost/filesystem.hpp
libboost-devel-1.60.0-1 - libboost-devel: Boost C++ libraries (installed binaries and support files)
libboost-devel-1.60.0-2 - libboost-devel: Boost C++ libraries (installed binaries and support files)
mingw64-i686-boost-1.60.0-1 - mingw64-i686-boost: Boost C++ libraries for Win32 toolchain (installed binaries and support files)
mingw64-i686-boost-1.60.0-2 - mingw64-i686-boost: Boost C++ libraries for Win32 toolchain (installed binaries and support files)
mingw64-x86_64-boost-1.60.0-1 - mingw64-x86_64-boost: Boost C++ libraries for Win64 toolchain (installed binaries and support files)
mingw64-x86_64-boost-1.60.0-2 - mingw64-x86_64-boost: Boost C++ libraries for Win64 toolchain (installed binaries and support files)
so you need to install libboost-devel as you are not crosscompiling for mingw64.
Similar for
$ cygcheck -p opencv/cv.hpp
Found 1 matches for opencv/cv.hpp
libopencv-devel-2.4.11-1 - libopencv-devel: Real-time computer vision library (development) (installed binaries and support files)
Probably you don't have any boost installed in your system. I got this error and solved by installing it.
sudo apt-get install libboost-all-dev
so I'm learning about llvm and I decided to build the 3.8 from the tars that I downloaded from LLVM site.
Everything works fine and I managed to build the sources in a separate build folder.
(After downloading all the sources)
$cd llvm3.8/build
$cmake -G "Unix Makefiles" ../llvm
$make -j 4
$make install
so my dir looks a bit like this:
llvm3.8/
llvm3.8/build
llvm3.8/llvm
While learning how to write a LLVM pass I noticed that my build folder is missing these files:
Makefile.config
Makefile.common
Makefile.rule
that I use in the Makefile I have written for the pass I've implemented.
What I know is that the source has these files:
$cd llvm3.8/llvm
$ls:
CMakeLists.txt README.txt llvm.spec.in
CODE_OWNERS.TXT autoconf projects
CREDITS.TXT bindings resources
LICENSE.TXT cmake test
LLVMBuild.txt configure tools
Makefile docs unittests
Makefile.common examples utils
Makefile.config.in include
Makefile.rules lib
while my build folder doesn't.
$ cd llvm3.8/build
$ ls
CMakeCache.txt cmake libexec
CMakeFiles cmake_install.cmake projects
CPackConfig.cmake compile_commands.json share
CPackSourceConfig.cmake docs test
DummyConfigureOutput examples tools
LLVMBuild.cmake include unittests
Makefile install_manifest.txt utils
bin lib
Is my build folder containing what it is supposed to contain?
Maybe the pass must be written in the sources llvm3.8/llvm?
Thanks for the help.
You are suppose to write your pass in llvm/lib/Transforms/YourPassName
Create a directory in build:
mkdir -p llvm3.8/build/lib/Transforms/YourPassName
I would recommend you to use cmake. As autoconf is going to be deprecated in llvm3.9. For it:
Add entry in llvm/lib/Transforms/CMakeLists.txt
add_subdirectory(YourPassName)
After putting the entry, create CMakeLists.Txt in llvm/lib/Transforms/YourPassName like the other llvm passes.
Now use
cmake ../llvm3.8
From inside the pass directory:
make
Also if you have install llvm and want to do standalone, use the approach given in this answer: https://stackoverflow.com/a/37308946/4946286