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Call a foreign-language function: Difference between revisions
Call a foreign-language function (view source)
Revision as of 19:53, 22 September 2017
, 6 years ago→{{header|CMake}}: Warn about deprecation. Add instruction to run `cmake .`.
(→{{header|CMake}}: Fix programmer's mistake: c must be &c to prevent a crash when argv[i] isn't an integer.) |
(→{{header|CMake}}: Warn about deprecation. Add instruction to run `cmake .`.) |
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=={{header|CMake}}==
''This code uses a deprecated feature of CMake.'' In 2014, CMake 3.0 deprecated load_command(). CMake 3.0 can run this code but shows a deprecation warning. When a future version of CMake removes load_command(), this code will stop working, and there will be no way to call C functions from CMake.
This example defines CMake command div() to call [http://man7.org/linux/man-pages/man3/div.3.html C function div()]. Only works in a project, not in a <code>cmake -P</code> script. Uses more than 20 lines of CMake and 50 lines of C.▼
▲In old versions of CMake, we can write custom commands for CMake in C. This example defines CMake command div() to call [http://man7.org/linux/man-pages/man3/div.3.html C function div()]. Only works in a project, not in a <code>cmake -P</code> script. Uses more than 20 lines of CMake and 50 lines of C. There are 3 files: ''CMakeLists.txt'' in the top directory, and ''div/CMakeLists.txt'' and ''div/div-command.c'' in a subdirectory. Run it with the command <code>cmake .</code> in the top directory.
'''CMakeLists.txt'''
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