Hei hei, for a standalone build without system libraries I was experimenting with the ExternalProject module today. My goal is to have some top level build project which includes several CMake projects and some external projects without relying on dev libraries installed on the system (reason are basically incompatible library versions). However those CMake projects should not be altered and should also be capable of building against dev libs from the system or in a cross compile environment like ptxdist. I created a simple example project to build OpenSSL with the ExternalProject module, and link either that or the OpenSSL lib from the system:
https://github.com/LeSpocky/effective-succotash (Note: using MD5 inside this example program is really just a very simple example, the real application will use more of OpenSSL, so that one is really needed, please no suggestions for alternatives. ;-) ) (Also note: some things were inspired by the FindOpenSSL.cmake coming with CMake 3.9). This works in general with one minor flaw. When building OpenSSL as external project, I have to run the build twice, because find_library and find_path obviously fail to find OpenSSL in the build tree before it is built. I could set those paths by hand with a priori knowledge were the OpenSSL build will put its output, but that seems like an unelegant solution to me. Any hints on that topic? What I found on the web was basically things from several years ago, I would appreciate a more modern CMake approach with imported targets. ;-) Greets Alex -- /"\ ASCII RIBBON | »With the first link, the chain is forged. The first \ / CAMPAIGN | speech censured, the first thought forbidden, the X AGAINST | first freedom denied, chains us all irrevocably.« / \ HTML MAIL | (Jean-Luc Picard, quoting Judge Aaron Satie)
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