What is fPIC compile flag?

With the -fpic or -fPIC flag, gcc creates an object file with position independent code. This is usually necessary when creating a shared object. Apparently, on a x86 environment, -fpic and -fPIC are equivalent. On other architectures, there is a difference.

What does fPIC flag mean?

EDIT: In response to comment. If your code is compiled with -fPIC, it’s suitable for inclusion in a library – the library must be able to be relocated from its preferred location in memory to another address, there could be another already loaded library at the address your library prefers.

What is difference between fPIC and fPIC?

Use -fPIC or -fpic to generate position independent code. Whether to use -fPIC or -fpic to generate position independent code is target-dependent. The -fPIC choice always works, but may produce larger code than -fpic (mnenomic to remember this is that PIC is in a larger case, so it may produce larger amounts of code).

What is fPIC GCC?

gcc -fPIC generates position independent code (PIC) for shared libraries.

What is FPIC C++?

GNU project C and C++ compiler. -fpic Generate position-independent code (PIC) suitable for use in a shared library, if supported for the target machine. Such code accesses all constant addresses through a global offset table (GOT).

What is fPIC in c?

-fpic Generate position-independent code (PIC) suitable for use in a shared library, if supported for the target machine. Such code accesses all constant addresses through a global offset table (GOT).

What is fPIC compiler option?

-fPIC makes Position Independent Code for shared libraries. Alternative to shared libraries is to use static linkage. – Severin Pappadeux.

What is position independent code Linux?

In computing, position-independent code (PIC) or position-independent executable (PIE) is a body of machine code that, being placed somewhere in the primary memory, executes properly regardless of its absolute address. Position-independent code can be executed at any memory address without modification.

Why do I need fPIC?

Free, Prior and Informed Consent (FPIC) is a specific right that pertains to indigenous peoples and is recognised in the United Nations Declaration on the Rights of Indigenous Peoples (UNDRIP). It allows them to give or withhold consent to a project that may affect them or their territories.

What does recompile with fPIC mean?

Briefly, the error means that you can’t use a static library to be linked w/ a dynamic one. The correct way is to have a libavcodec compiled into a . so instead of . In other words -fPIC is a compiler option that has to be passed to the compiler somewhere.

What does compiler flag do?

These flags will produce executables that contain specific SIMD instructions which may effect compatibility with compute nodes on the SCC. Creates an executable that uses SIMD instructions based on the CPU that is compiling the code. Additionally it includes the optimizations from the -mtune=native flag.

Which is the most common compiler flag in GCC?

GCC and Clang Most common compiler flags: std – Specify the C++ version or ISO standard version. -std=c++11 (ISO C++11) -std=c++14 (ISO C++14) -std=c++1z (ISO C++17) -std=c++20 (C++20 experimental) -std=gnu++ (ISO C++ with GNU extensions)

What does FPIC mean in GCC for shared libraries?

Code that is built into shared libraries should normally be position-independent code, so that the shared library can readily be loaded at (more or less) any address in memory. The -fPIC option ensures that GCC produces such code.

How to add a linker or compile flag in a CMake?

As of CMake 3.13 you can also use target_link_options to add linker options which makes the intent more clear. Try setting the variable CMAKE_CXX_FLAGS instead of CMAKE_C_FLAGS: The variable CMAKE_C_FLAGS only affects the C compiler, but you are compiling C++ code. Adding the flag to CMAKE_EXE_LINKER_FLAGS is redundant.

How to pass the preprocessor flag in CPP?

=> Add search path to shared libraries, directory containing *.so, *.dll or *.dlyb files such as libLinearAlgebra.so depending on the current operating system. Add search path to header files (.h) or (.hpp). Pass preprocessor flag #if FLAG … std – Specify the C++ version or ISO standard version.