How to add preprocessor definitions on CMake's command line?

Asked Jun 23 '17 at 07:30

Active Jun 23 '17 at 07:30

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Is there a reliable way to add a C++ preprocessor definition on CMake's command line? If there is no cross-platform solution, is there at least a one on Windows?

Specifically, we would like to define the preprocessor symbols BOOST_ALL_NO_LIB and BOOST_ALL_DYN_LINK [1] without altering CMakeLists.txt (because this is part of an automated build for third-party libraries that we don't want to touch).

[1] These preprocessor symbols, together with Boost_USE_STATIC_LIBS CMake symbol, allow dynamic linking against Boost libraries on Windows.

asked Jun 23 '17 at 07:30

François Beaune

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`-DNAME=VAL` is one way. – Hatted Rooster Jun 23 '17 at 07:32
@GillBates As far as I know, this defines a CMake symbol, not a C++ preprocessor symbol. – François Beaune Jun 23 '17 at 08:05
Not if you add it to the `CXX` flag. `CXX += flags`. – Hatted Rooster Jun 23 '17 at 08:38
(From duplicate question, [this answer](https://stackoverflow.com/a/8564462/3440745) is valid for your case). – Tsyvarev Jun 23 '17 at 08:43
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@Tsyvarev But that will overwrite all other CXX flags determined by CMake itself. It does not append those flags (see also [here](https://stackoverflow.com/questions/44284275/passing-compiler-options-cmake)). – Florian Jun 23 '17 at 11:03

How to add preprocessor definitions on CMake's command line?

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