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build: Extract the libbitcoinkernel library
I strongly recommend reviewing with the following git-diff flags: --patience --color-moved=dimmed-zebra Extract out a libbitcoinkernel library linking in all files necessary for using our consensus engine as-is. Link bitcoin-chainstate against it. See previous commit "build: Add example bitcoin-chainstate executable" for more context. We explicitly specify -fvisibility=default, which effectively overrides the effects of --enable-reduced-exports since libbitcoinkernel requires default symbol visibility When compiling for mingw-w64, specify -static in both: - ..._la_CXXFLAGS so that libtool will avoid building two versions of each object (one PIC, one non-PIC). We just need the one that is suitable for static linking. - ..._la_LDFLAGS so that libtool will create a static library. If we don't specify this, then libtool will prefer the non-static PIC version of the object, which is built with -DDLL_EXPORT -DPIC for mingw-w64 targets. This can cause symbol resolution problems when we link this library against an executable that does specify -all-static, since that will be built without the -DDLL_EXPORT flag. Unfortunately, this means that for mingw-w64 we can only build a static version of the library for now. This will be fixed. However, on other targets, the shared library creation works fine. ----- Note to users: You need to either specify: --enable-experimental-util-chainstate or, --with-experimental-kernel-lib To build the libbitcionkernel library. See the configure help for more details. build shared libbitcoinkernel where we can
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