How can I use my own C library in QT creator C project? After googling I met two ways to do that:
Creating a completely new library and copy/paste your own library codes into the new library in QT creator.
The second one is done by "Add Existing Files" where you need to just adjust path and libs.
But both of them give in my case "undefined reference to ...".
I think and believe that it is because of linking problem. What is the solution for that? Any suggestions appreciated.
I could solve the same problem in Geany by altering "Set Build Command" from "gcc -Wall -o "%e" "%f" to "gcc -Wall -o "%e" "%f" "myHeader.c". Here myHeader.h is my own library.
I am coding completely on C.
You do not have a library technically speaking, you only have a set of files, a simple solution is to create a .pri where those files are added and link the .pri to .pro:
├── your_project.pro
├── main.c
├── ...
├── ...
└── mylibrary
├── file1.h
├── file1.c
├── file2.h
├── file2.c
└── mylibrary.pri
mylibrary.pri
INCLUDEPATH += $$PWD
SOURCES += \
$$PWD/file1.c \
$$PWD/file2.c
HEADERS += \
$$PWD/file1.h \
$$PWD/file2.h
your_project.pro
# ...
include(mylibrary/mylibrary.pri)
Related
The intermediate .obj files aren't being created when building a static C library using CMake and the ARM GNU Toolchain.
System Information
System: Linux Debian 10 4.19.0-4-amd64
CMake: 3.13.4
ARM GNU Toolchain: 8-2018-q4-major
Files
Library Directory Structure
bsp
└── SDK_2.5.0_FRDM-KV11Z
├── CMSIS
│ ├── Driver
│ │ ├── DriverTemplates
│ │ └── Include
│ └── Include
├── components
│ ├── fxos8700cq
│ ├── lists
│ ├── serial_manager
│ └── uart
└── devices
└── MKV11Z7
├── arm
├── cmsis_drivers
├── drivers
├── mcuxpresso
├── project_template
├── template
└── utilities
├── debug_console
└── str
Top Level CMakeLists.txt
cmake_minimum_required(VERSION 3.12)
project(rtos-project-structure C)
ENABLE_LANGUAGE(ASM)
SET(CMAKE_STATIC_LIBRARY_PREFIX)
SET(CMAKE_STATIC_LIBRARY_SUFFIX)
SET(CMAKE_EXECUTABLE_LIBRARY_PREFIX)
SET(CMAKE_EXECUTABLE_LIBRARY_SUFFIX)
add_subdirectory(bsp)
bsp/CMakeLists.txt
add_subdirectory(SDK_2.5.0_FRDM-KV11Z)
bsp/SDK_2.5.0_FRDM-KV11Z/CMakeLists.txt
cmake_policy(SET CMP0076 NEW)
add_library(kv11 STATIC)
set_target_properties(kv11 PROPERTIES LINKER_LANGUAGE C)
add_subdirectory(CMSIS)
add_subdirectory(components)
add_subdirectory(devices)
From here, there are just single line CMakeLists.txt in the directories with child directories, like in bsp/CMakeLists.txt, unless they have sources in them.
bsp/SDK_2.5.0_FRDM-KV11Z/CMSIS/Drivers/DriverTemplates/CMakeLists.txt
This is how the CMakeLists.txt file in directories with source files look.
set(SOURCE_FILES
Driver_CAN.c;
Driver_ETH_MAC.c;
Driver_ETH_PHY.c;
Driver_Flash.c;
Driver_I2C.c;
Driver_MCI.c;
Driver_SAI.c;
Driver_SPI.c;
Driver_USART.c;
Driver_USBD.c;
Driver_USBH.c;
)
target_sources(kv11 PUBLIC ${SOURCE_FILES})
target_include_directories(kv11 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
Running CMake
The build is invoked using the following commands:
rm -rf build
mkdir -p build
cd build
cmake -D CMAKE_BUILD_TYPE=Debug \
-D CMAKE_TOOLCHAIN_FILE="arm-gcc-toolchain.cmake" \
-D CMAKE_C_FLAGS="-fdiagnostics-color=always" \
--verbose \
..
make
which nets the following output:
-- The C compiler identification is GNU 8.2.1
-- Check for working C compiler: /home/vagrant/toolchain/bin/arm-none-eabi-gcc
-- Check for working C compiler: /home/vagrant/toolchain/bin/arm-none-eabi-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- The ASM compiler identification is GNU
-- Found assembler: /home/vagrant/toolchain/bin/arm-none-eabi-gcc
-- Configuring done
-- Generating done
-- Build files have been written to: /home/vagrant/nxp/build
make[1]: Entering directory '/home/vagrant/nxp/build'
make[2]: Entering directory '/home/vagrant/nxp/build'
make[3]: Entering directory '/home/vagrant/nxp/build'
Scanning dependencies of target kv11
make[3]: Leaving directory '/home/vagrant/nxp/build'
make[3]: Entering directory '/home/vagrant/nxp/build'
[ 1%] Building C object bsp/SDK_2.5.0_FRDM-KV11Z/CMakeFiles/kv11.dir/CMSIS/Driver/DriverTemplates/Driver_CAN.c.obj
...
[100%] Linking C static library kv11
/home/vagrant/toolchain/bin/arm-none-eabi-ar: CMakeFiles/kv11.dir/CMSIS/Driver/DriverTemplates/Driver_CAN.c.obj: No such file or directory
make[3]: *** [bsp/SDK_2.5.0_FRDM-KV11Z/CMakeFiles/kv11.dir/build.make:895: bsp/SDK_2.5.0_FRDM-KV11Z/kv11] Error 1
make[3]: Leaving directory '/home/vagrant/nxp/build'
make[2]: *** [CMakeFiles/Makefile2:1013: bsp/SDK_2.5.0_FRDM-KV11Z/CMakeFiles/kv11.dir/all] Error 2
make[2]: Leaving directory '/home/vagrant/nxp/build'
make[1]: *** [Makefile:95: all] Error 2
make[1]: Leaving directory '/home/vagrant/nxp/build'
make: *** [Makefile:20: build2] Error 2
Taking a closer look at the compile commands
GCC call created by CMake for one of the objects: (formated)
cd /home/vagrant/nxp/build/bsp/SDK_2.5.0_FRDM-KV11Z &&
/home/vagrant/toolchain/bin/arm-none-eabi-gcc
--sysroot=/home/vagrant/toolchain/bin/../arm-none-eabi
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/CMSIS/Driver/DriverTemplates
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/CMSIS/Driver/Include
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/CMSIS/Include
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/components/lists
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/components/serial_manager
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/components/uart
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/devices/MKV11Z7
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/devices/MKV11Z7/arm
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/devices/MKV11Z7/cmsis_drivers
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/devices/MKV11Z7/drivers
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/devices/MKV11Z7/template
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/devices/MKV11Z7/utilities
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/devices/MKV11Z7/utilities/debug_console
-I/home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/devices/MKV11Z7/utilities/str
-fdiagnostics-color=always
-fsyntax-only
-fno-common
-ffunction-sections
-fdata-sections
-ffreestanding
-fno-builtin
-mthumb
-mapcs
-mcpu=cortex-m0plus
-mfloat-abi=soft
-std=gnu99
-DCPU_MKV11Z128VLH7
-DFRDM_KV11Z
-DFREEDOM
-MMD
-MP
-DDEBUG
-g
-O0
-o CMakeFiles/kv11.dir/CMSIS/Driver/DriverTemplates/Driver_CAN.c.obj
-c /home/vagrant/nxp/bsp/SDK_2.5.0_FRDM-KV11Z/CMSIS/Driver/DriverTemplates/Driver_CAN.c
After this is run, there is no Driver_CAN.c.obj file in the CMakeFiles/kv11.dir/CMSIS/Driver/DriverTemplates directory.
What is wrong with the CMake Configuration that is causing the intermediate .obj files to not be created, which causes the library to not link properly.
I figured it out.
I turned on -fsyntax-only in the toolchain when debugging some initial files and forgot to turn it off.
I'm having issues with cmake while trying to cross compile an existing, large codebase. Our current build system uses a proprietary IDE that is causing a large number of issues -- so we're trying to move away.
I've distilled this to the simplest example I can.
Note: This all works when I don't use the toolchain option with cmake. I can get this to compile and run if just using the native toolchain.
I don't currently suspect issues with the toolchain file for cmake. I have used it to get OpenCV to compile -- with some hacking OpenCV.
The error that I get when trying to cross compile is:
-- The C compiler identification is GNU 4.8.3
-- The CXX compiler identification is GNU 4.8.3
-- Check for working C compiler: /opt/qnx650/host/linux/x86/usr/bin/ntox86-gcc
-- Check for working C compiler: /opt/qnx650/host/linux/x86/usr/bin/ntox86-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /opt/qnx650/host/linux/x86/usr/bin/ntox86-g++
-- Check for working CXX compiler: /opt/qnx650/host/linux/x86/usr/bin/ntox86-g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Configuring done
-- Generating done
-- Build files have been written to: /home/MY_USER/Desktop/test_app/build-test_app
Scanning dependencies of target liba
[ 25%] Building C object libs/liba/CMakeFiles/liba.dir/liba.c.o
Linking C shared library libliba.so
[ 25%] Built target liba
Scanning dependencies of target libb
[ 50%] Building C object libs/libb/CMakeFiles/libb.dir/libb.c.o
make[2]: *** No rule to make target `libs/liba/liba.a', needed by `libs/libb/liblibb.so.1.0.0'. Stop.
make[1]: *** [libs/libb/CMakeFiles/libb.dir/all] Error 2
make: *** [all] Error 2
It's like it's looking for a static version of the library, but I've configured it to use shared objects when calling cmake:
cmake -DBUILD_SHARED_LIBS=1 ..
I've included all of the files in the test project below. This is the same issue I run into when trying to get the larger project to compile.
Project structure:
test_app
├── app
│ ├── appa
│ │ ├── appa.c
│ │ └── CMakeLists.txt
│ └── CMakeLists.txt
├── CMakeLists.txt
├── include
│ ├── liba
│ │ └── liba.h
│ ├── libb
│ │ └── libb.h
│ └── libc
│ └── libc.h
└── libs
├── CMakeLists.txt
├── liba
│ ├── CMakeLists.txt
│ └── liba.c
├── libb
│ ├── CMakeLists.txt
│ └── libb.c
└── libc
├── CMakeLists.txt
└── libc.c
Top level CMakeLists.txt
project(test)
cmake_minimum_required(VERSION 2.8)
set(CMAKE_INSTALL_PREFIX "/opt/test")
set(INSTALL_PERMISSIONS OWNER_READ OWNER_EXECUTE GROUP_READ GROUP_EXECUTE WORLD_EXECUTE)
set(TEST_VERSION 1.0.0)
set(TEST_MAJOR_VERSION 1)
set(TEST_GLOBAL_INCLUDES
$<BUILD_INTERFACE:${CROSS_TARGET}/usr/pkg/include>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
)
set(TEST_GLOBAL_LIB_PATHS
$<BUILD_INTERFACE:${CROSS_TARGET}/usr/pkg/include>
$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
)
add_subdirectory(libs)
add_subdirectory(app)
app/CMakeLists.txt
add_subdirectory(appa)
app/appa/CMakeLists.txt
project(appa)
add_executable(appa appa.c)
target_include_directories(appa PUBLIC ${TEST_GLOBAL_INCLUDES})
target_link_libraries(appa libc)
# Set version information
set_target_properties(appa PROPERTIES
VERSION ${TEST_VERSION}
)
# set install destination and permissions
install(
TARGETS appa
RUNTIME DESTINATION lib
PERMISSIONS ${INSTALL_PERMISSIONS}
)
app/appa/appa.c
#include <stdlib.h>
#include <stdio.h>
#include <libc/libc.h>
int main(int argc, char **argv)
{
printf("Hello world: %d\n", libc_function(2));
return EXIT_SUCCESS;
}
include/liba/liba.h
#pragma once
int liba_function(int a);
include/libb/libb.h
#pragma once
int libb_function(int a);
include/libc/libc.h
#pragma once
int libc_function(int a);
libs/CMakeLists.txt
add_subdirectory(liba)
add_subdirectory(libb)
add_subdirectory(libc)
libs/liba/CMakeLists.txt
project(libliba)
add_library(liba liba.c)
target_include_directories(liba PUBLIC ${TEST_GLOBAL_INCLUDES})
# Set version information
set_target_properties(liba PROPERTIES
VERSION ${TEST_VERSION}
SOVERSION ${TEST_MAJOR_VERSION}
)
# set install destination and permissions
install(
TARGETS liba
LIBRARY DESTINATION lib
ARCHIVE DESTINATION lib
RUNTIME DESTINATION lib
PERMISSIONS ${INSTALL_PERMISSIONS}
)
libs/liba/liba.c
#include <liba/liba.h>
int liba_function(int a)
{
return a * a;
}
libs/libb/CMakeLists.txt
project(liblibb)
add_library(libb libb.c)
target_include_directories(liba PUBLIC ${TEST_GLOBAL_INCLUDES})
# Set version information
set_target_properties(libb PROPERTIES
VERSION ${TEST_VERSION}
SOVERSION ${TEST_MAJOR_VERSION}
)
target_link_libraries(libb liba)
# set install destination and permissions
install(
TARGETS libb
LIBRARY DESTINATION lib
ARCHIVE DESTINATION lib
RUNTIME DESTINATION lib
PERMISSIONS ${INSTALL_PERMISSIONS}
)
libs/libb/libb.c
#include <liba/liba.h>
#include <libb/libb.h>
int libb_function(int a)
{
return liba_function(a) * liba_function(a);
}
libs/libc/CMakeLists.txt
project(liblibc)
add_library(libc libc.c)
target_include_directories(libc PUBLIC ${TEST_GLOBAL_INCLUDES})
# Set version information
set_target_properties(libc PROPERTIES
VERSION ${TEST_VERSION}
SOVERSION ${TEST_MAJOR_VERSION}
)
target_link_libraries(libc libb)
# set install destination and permissions
install(
TARGETS libc
LIBRARY DESTINATION lib
ARCHIVE DESTINATION lib
RUNTIME DESTINATION lib
PERMISSIONS ${INSTALL_PERMISSIONS}
)
libs/libc/libc.c
#include <libb/libb.h>
#include <libc/libc.h>
int libc_function(int a)
{
return libb_function(a) * libb_function(a);
}
I am trying to wrap a quite large C library in Rust. I used bindgen to generate the bindings. Rust seems content with those. However, despite my different attempts and my many reads of the build-script docs, I keep on getting linking issues.
The library I'm using has a set of csh script which end up building two .a files: cspice.a and csupport.a. They are both stored in the cspice_linux_gcc_64bit/lib of my project (cf. the tree at bottom).
I currently test the proper binding by calling constants and functions from my tests, cf. lib.rs (on my Github).
I highly suspect that something is wrong with my build.rs or, less likely, my Cargo.toml.
Linking error
Running `rustc --crate-name spice src/lib.rs --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=94c06ffe4bfd7d5f -C extra-filename=-94c06ffe4bfd7d5f --out-dir /home/chris/Workspace/rust/SPICE/target/debug/deps -L dependency=/home/chris/Workspace/rust/SPICE/target/debug/deps -L native=cspice_linux_gcc_64bit/lib -l static=cspice`
error: could not find native static library `cspice`, perhaps an -L flag is missing?
error: Could not compile `spice`.
Caused by:
process didn't exit successfully: `rustc --crate-name spice src/lib.rs --crate-type lib --emit=dep-info,link -C debuginfo=2 -C metadata=94c06ffe4bfd7d5f -C extra-filename=-94c06ffe4bfd7d5f --out-dir /home/chris/Workspace/rust/SPICE/target/debug/deps -L dependency=/home/chris/Workspace/rust/SPICE/target/debug/deps -L native=cspice_linux_gcc_64bit/lib -l static=cspice` (exit code: 101)
Build failed, waiting for other jobs to finish...
error: linking with `cc` failed: exit code: 1
|
= note: "cc" "-Wl,--as-needed" "-Wl,-z,noexecstack" "-m64" "-L" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "/home/chris/Workspace/rust/SPICE/target/debug/deps/spice-e22b64d176595306.0.o" "-o" "/home/chris/Workspace/rust/SPICE/target/debug/deps/spice-e22b64d176595306" "-Wl,--gc-sections" "-pie" "-nodefaultlibs" "-L" "/home/chris/Workspace/rust/SPICE/target/debug/deps" "-L" "cspice_linux_gcc_64bit/lib" "-L" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib" "-Wl,-Bstatic" "-Wl,--whole-archive" "-l" "cspice" "-Wl,--no-whole-archive" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libtest-163c20e386ec0612.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libgetopts-bd312ea730ea22d0.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libterm-4959b4e709084e0a.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd-35ad9950c7e5074b.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libpanic_unwind-fb44afc024bbc636.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libunwind-14b8f3202acdad6a.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/librand-20a50a22d4c2b1e9.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcollections-b479831207997444.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc-10b591f1a68dd370.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liballoc_jemalloc-28913dc5a1e63cd7.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/liblibc-6ecacccb5bdc4911.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libstd_unicode-f4f0ae88f5ad8ad4.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcore-bfaa82017ca17cb2.rlib" "/home/chris/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/x86_64-unknown-linux-gnu/lib/libcompiler_builtins-863b57a66ba6c3e1.rlib" "-Wl,-Bdynamic" "-l" "dl" "-l" "rt" "-l" "pthread" "-l" "gcc_s" "-l" "pthread" "-l" "c" "-l" "m" "-l" "rt" "-l" "pthread" "-l" "util"
= note: /usr/lib64/gcc/x86_64-suse-linux/4.8/../../../../x86_64-suse-linux/bin/ld: cannot find -lcspice
collect2: error: ld returned 1 exit status
error: aborting due to previous error(s)
error: Could not compile `spice`.
Caused by:
process didn't exit successfully: `rustc --crate-name spice src/lib.rs --emit=dep-info,link -C debuginfo=2 --test -C metadata=e22b64d176595306 -C extra-filename=-e22b64d176595306 --out-dir /home/chris/Workspace/rust/SPICE/target/debug/deps -L dependency=/home/chris/Workspace/rust/SPICE/target/debug/deps -L native=cspice_linux_gcc_64bit/lib -l static=cspice` (exit code: 101)
build.rs
extern crate bindgen;
use std::env;
use std::path::PathBuf;
fn main() {
let out_dir = env::var("OUT_DIR").unwrap();
// Tell cargo to tell rustc to link the system bzip2
// shared library.
println!("cargo:rustc-link-search=native=cspice_linux_gcc_64bit/lib");
println!("cargo:rustc-link-lib=static=cspice");
//println!("cargo:rustc-flags=-L cspice_linux_gcc_64bit/lib");
// The bindgen::Builder is the main entry point
// to bindgen, and lets you build up options for
// the resulting bindings.
let bindings = bindgen::Builder::default()
// The input header we would like to generate
// bindings for.
.header("spice_wrapper.h")
// Finish the builder and generate the bindings.
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");
let out_path = PathBuf::from(out_dir.clone());
// Write the bindings to the $OUT_DIR/bindings.rs file.
bindings
.write_to_file(out_path.join("spice_bindings.rs"))
.expect("Couldn't write bindings!");
}
Cargo.toml
[package]
(...)
links = "cspice"
build = "build.rs"
[build-dependencies]
bindgen = "0.26.3"
[dependencies]
Tree
.
├── build.rs
├── Cargo.lock
├── Cargo.toml
├── cspice_linux_gcc_64bit
│ ├── data
│ ├── doc
│ ├── etc
│ ├── exe
│ ├── include
│ ├── lib
│ ├── makeall.csh
│ └── src
├── spice_wrapper.h
├── src
│ └── lib.rs
└── target
└── debug
building two .a files: cspice.a and csupport.a
On Linux, static libraries are generally called libfoo.a, but your library doesn't have the lib prefix.
Renaming the file to libcspice.a should allow it to compile. I'm not sure if you'd want to modify your build script or the libraries build script to perform the renaming. It's even possible that the library itself has a compilation switch to use a platform-standard naming scheme.
I installed YCM and syntastic for VIM, normally they work fine, but I have problem when it detect some errors in my code, it shows that can NOT find some head files(which is my project head file).
My directory tree shows below:
TOP
├── debug
│ ├── debug.c
│ ├── debug.h
│ ├── debug.mk
│ └── instrument.c
├── driver
│ ├── driver.c
│ ├── driver_ddi.c
│ ├── driver_ddi.h
│ ├── driver.h
│ └── driver.mk
├── include
│ └── common.h
├── libs
├── Makefile
├── mw
│ ├── manager.c
│ └── mw.mk
└── root
├── main.c
└── root.mk
I copied a .ycm_extra_conf.py to the TOP, meanwhile, I will generated tag and cscope file at TOP as well, therefore each time I open file on TOP, like:
howchen#host:~/Work/c/sample/src
-> gvim ./driver/driver.c
to make sure each time I can add tag and cscope file in VIM. The problem is, if I open driver.c, which contain head files： driver.h, driver_ddi.h, debug.h, common.h, code like below:
#include <stdio.h>
#include <stdlib.h>
#include "math.h"
#include "common.h"
#include "debug.h"
#include "driver_ddi.h"
#include "driver.h"
the syntastic or YCM always show it can NOT find common.h and debug.h, other head files are OK.
My YCM and syntastic config part in vimrc file:
" YCM
" let g:ycm_extra_conf_globlist = ['~/.vim/bundle/YouCompleteMe/cpp/ycm/*','!~/*']
let g:ycm_global_ycm_extra_conf = '~/.vim/bundle/YouCompleteMe/cpp/ycm/.ycm_extra_conf.py'
" Syntastic
let g:syntastic_c_checkers=['make']
let g:syntastic_always_populate_loc_list = 1
let g:syntastic_check_on_open=1
let g:syntastic_enable_signs=1
let g:syntastic_error_symbol = '✗'
let g:syntastic_warning_symbol = '⚠'
set statusline+=%#warningmsg#
set statusline+=%{SyntasticStatuslineFlag()}
set statusline+=%*gbar
My .ycm_extra_conf.py write flags variable as:
flags = [
'-Wall',
'-Wextra',
'-Werror',
'-Wc++98-compat',
'-Wno-long-long',
'-Wno-variadic-macros',
'-fexceptions',
'-DNDEBUG',
'-std=c99',
# ...and the same thing goes for the magic -x option which specifies the
# language that the files to be compiled are written in. This is mostly
# relevant for c++ headers.
# For a C project, you would set this to 'c' instead of 'c++'.
'-x', #I don't know if I need remove -x
'c',
'-isystem',
'../llvm/include',
'-isystem',
'../llvm/tools/clang/include',
'-I',
'.',
'-I',
'../driver'
'-I',
'../debug'
'-I',
'../include'
'-I',
'../include'
]
any wrong flags I set?
Moved here from the question.
I found the problem:
flags = [
'-Wall',
'-Wextra',
'-Werror',
'-Wc++98-compat',
'-Wno-long-long',
'-Wno-variadic-macros',
'-fexceptions',
'-DNDEBUG',
'-std=c99',
# ...and the same thing goes for the magic -x option which specifies the
# language that the files to be compiled are written in. This is mostly
# relevant for c++ headers.
# For a C project, you would set this to 'c' instead of 'c++'.
'-x', #I don't know if I need remove -x
'c',
'-isystem',
'../llvm/include',
'-isystem',
'../llvm/tools/clang/include',
'-I./driver',
'-I./debug',
'-I./include',
]
I missed a comma and path should be ./xxx, also neeeeed '-I/usr/include', and '-I/usr/local/include'.
This question already has answers here:
'undefined reference' errors when compiling against library
(2 answers)
Closed 10 years ago.
I'm having a problem trying to run the GNU Readline library sample code available in wikipedia. Here it goes:
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <readline/readline.h>
#include <readline/history.h>
int main()
{
char* input, shell_prompt[100];
// Configure readline to auto-complete paths when the tab key is hit.
rl_bind_key('\t', rl_complete);
for(;;) {
// Create prompt string from user name and current working directory.
snprintf(shell_prompt, sizeof(shell_prompt), "%s:%s $ ", getenv("USER"), getcwd(NULL, 1024));
// Display prompt and read input (n.b. input must be freed after use)...
input = readline(shell_prompt);
// Check for EOF.
if (!input)
break;
// Add input to history.
add_history(input);
// Do stuff...
// Free input.
free(input);
}
}
I'm working on a restricted environment were readline was not available, so I had to download the sources, compile it and install it to my home dir.
This is the structure inside my home directory:
.local
├── include
│ └── readline
│ ├── chardefs.h
│ ├── history.h
│ ├── keymaps.h
│ ├── readline.h
│ ├── rlconf.h
│ ├── rlstdc.h
│ ├── rltypedefs.h
│ └── tilde.h
└── lib
├── libhistory.a
├── libhistory.so -> libhistory.so.6
├── libhistory.so.6 -> libhistory.so.6.2
├── libhistory.so.6.2
├── libreadline.a
├── libreadline.so -> libreadline.so.6
├── libreadline.so.6 -> libreadline.so.6.2
└── libreadline.so.6.2
The problem is, when I call gcc it throws me an error:
$ gcc hello.c -o hello_c.o -I /home/my-home-dir/.local/include
/tmp/cckC236E.o: In function `main':
hello.c:(.text+0xa): undefined reference to `rl_complete'
hello.c:(.text+0x14): undefined reference to `rl_bind_key'
hello.c:(.text+0x60): undefined reference to `readline'
hello.c:(.text+0x77): undefined reference to `add_history'
collect2: error: ld returned 1 exit status
There is an answer about this here, but I'm not using Netbeans and I'm not quite sure how to specify the path to the library on the command line.
I tried to tell the linker where the libraries are, but the result is still the same:
$ gcc hello.c -o hello_c.o -I /home/my-home-dir/.local/include -Xlinker "-L /home/my-home-dir/.local/lib"
/tmp/cceiePMr.o: In function `main':
hello.c:(.text+0xa): undefined reference to `rl_complete'
hello.c:(.text+0x14): undefined reference to `rl_bind_key'
hello.c:(.text+0x60): undefined reference to `readline'
hello.c:(.text+0x77): undefined reference to `add_history'
collect2: error: ld returned 1 exit status
Any ideas what I might be missing here?
You need to link against the actual library using -lreadline in gcc arguments.