extern means that the entity has external linkage, i.e. is visible outside its translation unit (C or CPP file). The implication of this is that a corresponding symbol will be placed in the object file, and it will hence also be visible if this object file is made part of a static library. However, extern … Read more
You can link the standard c++ library with the -l flag to gcc: gcc cplusplus.o -lstdc++ -o myexe
Libraries must be listed after the objects that use them (more precisely, a library will be used only if it contains a symbol that satisfies an undefined reference known at the time it is encountered). Move the -lmnl to the end of the command.
I’ve managed to solve my problem by using the following: #Dynamic/Shared Libs … #Static start set_target_properties(icarus PROPERTIES LINK_SEARCH_START_STATIC 1) set_target_properties(icarus PROPERTIES LINK_SEARCH_END_STATIC 1) set(CMAKE_FIND_LIBRARY_SUFFIXES “.a”) #Static Libs … #Set Linker flags set(CMAKE_EXE_LINKER_FLAGS “-static-libgcc -static-libstdc++”) This works without passing a -static which creates other big issues, and can essentially mix static and dynamic libraries. As long … Read more
LIBS += -L[path to lib] -l[name of lib] Note! that filename of lib: lib[nameOfLib].a and you have to pass only original part -l[nameOfLib]
As said in similar question iOS Static Library as a Subproject of a Project That Has Custom Build Configurations?, the fix is to add this line $(BUILD_DIR)/Release$(EFFECTIVE_PLATFORM_NAME) to your target’s Framework Search Paths, Header Search Paths and/or Library Search Paths
What is a DSO? A DSO is a Dynamic Shared Object, or less formally a shared library. What is a hidden symbol? A hidden symbol is a symbol (i.e. name of function or data object) that has been compiled with hidden linkage, e.g. as per the (GCC specific) declaration: int x __attribute__ ((visibility (“hidden”))); If … Read more
I don’t think this is a bug. If you change the constexpr to const, it still fails, with the exact same error. You’ve declared S::X, but not defined it anywhere, so there’s no storage for it. If you do anything with it that needs to know the address of it then you’ll need to define … Read more
Afaik LD keeps the symbols in the section even if symbols are not referenced. (–gc-sections). Usually used for sections that have some special meaning in the binary startup process, more or less to mark the roots of the dependency tree. (For Sabuncu below) Dependency tree: If you eliminate unused code, you analyze the code and … Read more
Your problems are/were not related to a specific CMake version. It’s the same for all linker/compiler flag variables in CMake. Because those variables are cached variables and set with the project()/enable_language() command (details see here), you either have to prefill the cache with set(… CACHE …) before the project() command generally use the set(… CACHE … Read more