LibreCAD_3编译遇到的问题_最后的链结失败: bad value-优快云博客

本文链接：https://blog.youkuaiyun.com/FifthII/article/details/120619138

博主在Ubuntu18上编译LibreCAD_3时遇到了三个问题： tinyspline库编译选项缺失-fPIC、glfwGetError未声明和gtest库未安装。通过修改CMakeLists.txt文件添加-fPIC选项，替换glfwGetError为glGetError，以及手动编译安装GoogleTest，最终成功解决所有问题并完成编译。

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LibreCAD是Linux平台上常见的2D绘图软件，本人因工作需经常开发机床的简易CAD软件，对其一直特别关注。这个软件有一个较大的升级版本LibreCAD_3，想体验一下，打开Ubuntu18，上GitHub，克隆源代码，编译，官方Wiki已经给出编译方法，

Building · LibreCAD/LibreCAD_3 Wiki · GitHub

但事情发展没那么顺利，执行到步骤

make -j 4

遭遇了三个错误，第一错误信如下：

[ 22%] Linking CXX shared library liblckernel.so
/usr/bin/ld: tinyspline/lib/libtinysplinecxx.a(tinyspline.c.o): relocation R_X86_64_PC32 against symbol `ts_bspline_set_knots' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: 最后的链结失败: 错误的值

网上查了很久也没找到方法白嫖，最后只好自己硬着头皮修改了

LibreCAD_3/lckernel/tinyspline/src/CMakeLists.txt文件的603行和614行

# TINYSPLINE_LIBRARY_C_FLAGS
   list(APPEND TINYSPLINE_LIBRARY_C_FLAGS
       "-std=c89"
       "-pedantic"
       "-fPIC -Wall" // 修改过
       "-Wextra"
       "-Wfloat-equal")
。。。。。。

# TINYSPLINE_LIBRARY_CXX_FLAGS
   list(APPEND TINYSPLINE_LIBRARY_CXX_FLAGS
       "-fPIC -Wall" // 修改过
       "-Wextra"
       "-Wfloat-equal")

改了再make就好。

第二个问题

[ 90%] Building CXX object luacmdinterface/CMakeFiles/luacmdinterface.dir/main.cpp.o
/home/quan/GitRoot/LibreCAD_3/luacmdinterface/main.cpp: In function ‘int main(int, char**)’:
/home/quan/GitRoot/LibreCAD_3/luacmdinterface/main.cpp:152:9: error: ‘glfwGetError’ was not declared in this scope
glfwGetError(&description);
^~~~~~~~~~~~
/home/quan/GitRoot/LibreCAD_3/luacmdinterface/main.cpp:152:9: note: suggested alternative: ‘’
glfwGetError(&description);
^~~~~~~~~~~~
glGetError
按照提示信息，改“glfwGetError(&description);”为“glGetError()”

第三个问题

[ 99%] Building CXX object unittest/CMakeFiles/lcunittest.dir/rendering/renderingtest.cpp.o
[100%] Linking CXX executable ../bin/lcunittest
/usr/bin/ld: 找不到 -lgtest
collect2: error: ld returned 1 exit status
unittest/CMakeFiles/lcunittest.dir/build.make:761: recipe for target 'bin/lcunittest' failed
make[2]: *** [bin/lcunittest] Error 1
CMakeFiles/Makefile2:1771: recipe for target 'unittest/CMakeFiles/lcunittest.dir/all' failed
make[1]: *** [unittest/CMakeFiles/lcunittest.dir/all] Error 2
Makefile:155: recipe for target 'all' failed
make: *** [all] Error 2

查wiki可知是 Google Test没安装，“You need to compile Google Test in /usr/src/gtest/ and move the libraries in /usr/lib/”具体安装步骤如下：

cd /usr/src/gtest

sudo mkdir build

sudo cd build

sudo cmake ..

sudo make

sudo make install

重新make全部通过。