/** * power - Calculate the power of number. * @param base: Base value. * @param exponent: Exponent value. * * @return base raised to the power exponent. */ doublepower(double base, int exponent) { int result = base; int i;
if (exponent == 0) { return1; }
for(i = 1; i < exponent; ++i){ result = result * base; }
return result; }
intmain(int argc, char *argv[]) { if (argc < 3){ printf("Usage: %s base exponent \n", argv[0]); return1; } double base = atof(argv[1]); int exponent = atoi(argv[2]); double result = power(base, exponent); printf("%g ^ %d is %g\n", base, exponent, result); return0; }
之后，在当前目录执行 cmake . ，得到 Makefile 后再使用 make 命令编译得到 Demo1 可执行文件。
[ehome@xman Demo1]$ cmake . -- The C compiler identification is GNU 4.8.2 -- The CXX compiler identification is GNU 4.8.2 -- Check for working C compiler: /usr/sbin/cc -- Check for working C compiler: /usr/sbin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Check for working CXX compiler: /usr/sbin/c++ -- Check for working CXX compiler: /usr/sbin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Configuring done -- Generating done -- Build files have been written to: /home/ehome/Documents/programming/C/power/Demo1 [ehome@xman Demo1]$ make Scanning dependencies of target Demo [100%] Building C object CMakeFiles/Demo.dir/main.cc.o Linking C executable Demo [100%] Built target Demo [ehome@xman Demo1]$ ./Demo 54 5 ^ 4 is 625 [ehome@xman Demo1]$ ./Demo 73 7 ^ 3 is 343 [ehome@xman Demo1]$ ./Demo 210 2 ^ 10 is 1024
intmain(int argc, char *argv[]) { if (argc < 3){ printf("Usage: %s base exponent \n", argv[0]); return1; } double base = atof(argv[1]); int exponent = atoi(argv[2]);
#ifdef USE_MYMATH printf("Now we use our own Math library. \n"); double result = power(base, exponent); #else printf("Now we use the standard library. \n"); double result = pow(base, exponent); #endif printf("%g ^ %d is %g\n", base, exponent, result); return0; }
# 检查系统是否支持 pow 函数 include (${CMAKE_ROOT}/Modules/CheckFunctionExists.cmake) check_function_exists (pow HAVE_POW)
将上面这段代码放在 configure_file 命令前。
预定义相关宏变量
接下来修改 config.h.in 文件，预定义相关的宏变量。
// does the platform provide pow function? #cmakedefine HAVE_POW
在代码中使用宏和函数
最后一步是修改 main.cc ，在代码中使用宏和函数：
#ifdef HAVE_POW printf("Now we use the standard library. \n"); double result = pow(base, exponent); #else printf("Now we use our own Math library. \n"); double result = power(base, exponent); #endif
intmain(int argc, char *argv[]) { if (argc < 3){ // print version info printf("%s Version %d.%d\n", argv[0], Demo_VERSION_MAJOR, Demo_VERSION_MINOR); printf("Usage: %s base exponent \n", argv[0]); return1; } double base = atof(argv[1]); int exponent = atoi(argv[2]);
#if defined (HAVE_POW) printf("Now we use the standard library. \n"); double result = pow(base, exponent); #else printf("Now we use our own Math library. \n"); double result = power(base, exponent); #endif
printf("%g ^ %d is %g\n", base, exponent, result); return0; }
# 构建一个 CPack 安装包 include (InstallRequiredSystemLibraries) set (CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/License.txt") set (CPACK_PACKAGE_VERSION_MAJOR "${Demo_VERSION_MAJOR}") set (CPACK_PACKAGE_VERSION_MINOR "${Demo_VERSION_MINOR}") include (CPack)
[ehome@xman Demo8]$ sh Demo8-1.0.1-Linux.sh Demo8 Installer Version: 1.0.1, Copyright (c) Humanity This is a self-extracting archive. The archive will be extracted to: /home/ehome/Documents/programming/C/power/Demo8
If you want to stop extracting, please press . The MIT License (MIT)
Copyright (c) 2013 Joseph Pan(http://hahack.com)
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Do you accept the license? [yN]: y By default the Demo8 will be installed in: "/home/ehome/Documents/programming/C/power/Demo8/Demo8-1.0.1-Linux" Do you want to include the subdirectory Demo8-1.0.1-Linux? Saying no will install in: "/home/ehome/Documents/programming/C/power/Demo8" [Yn]: y
Using target directory: /home/ehome/Documents/programming/C/power/Demo8/Demo8-1.0.1-Linux Extracting, please wait...
Unpacking finished successfully
完成后提示安装到了 Demo8-1.0.1-Linux 子目录中，我们可以进去执行该程序：
[ehome@xman Demo8]$ ./Demo8-1.0.1-Linux/bin/Demo 5 2 Now we use our own Math library. 5 ^ 2 is 25
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