What is the fPIC flag?
The -fpic or -fPIC flags can be used to generate position-independent code. -fPIC is guaranteed to generate working code, but the code is slower on m68k, m88k, and SPARC chips. However, using -fpic on those chips imposes arbitrary size limits on the shared libraries.
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 . a , so the other . so library you are trying to build will link well.
What are the GCC flags?
Recommended compiler and linker flags for GCC
|Flag||Purpose||Applicable Fedora versions|
|-g||Generate debugging information||All|
|-grecord-gcc-switches||Store compiler flags in debugging information||All|
|-mcet -fcf-protection||Control flow integrity protection||28 and later (x86 only)|
What is the purpose of fPIC flag while generating shared library?
Compile the file library. c file using the following command. The flag -shared instructs the compiler that we are building a shared library. The flag -fPIC is to generate position independent code (ignore for now).
Can fPIC be used with static library?
A shared library needs to contain only position-independent code (in practice); but a static library does not contain PIC. In practice, you’ll better recompile your static library code with -fPIC ; BTW the x86-64 ISA was designed to facilitate PIC.
What is compile flag?
Compile-time flags are boolean values provided through the compiler via a macro method. They allow to conditionally include or exclude code based on compile time conditions. There are several default flags provided by the compiler with information about compiler options and the target platform.
What does the flag do for GCC?
gcc -c compiles source files without linking.
How do you set CFLAGS in settings?
What is the correct syntax to add CFLAGS and LDFLAGS to “configure”?
- Untar the source tarball to a freshly created directory.
- Issue the command ./configure CFLAGS=”-I/usr/local/include” LDFLAGS=”-L/usr/local/lib”
- Issue the command make.
- Issue the command make install.
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 is fPIC command?
-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).
How do I use local flags in C++?
Use LOCAL_CFLAGS to specify flags for both C and C++. This variable stores the list of static libraries modules on which the current module depends. If the current module is a shared library or an executable, this variable will force these libraries to be linked into the resulting binary.
What is local_export_CFLAGS used for?
It is useful in cases where, for example, bar.c needs to include headers from module foo. This variable is the same as LOCAL_EXPORT_CFLAGS, but for linker flags.
What is the local_CFLAGS variable in C++?
This variable records a set of C/C++ compiler flags to add to the LOCAL_CFLAGS definition of any other module that uses this one via the LOCAL_STATIC_LIBRARIES or LOCAL_SHARED_LIBRARIES variables. For example, consider the following pair of modules: foo and bar, which depends on foo:
What is the-fPIC option in GCC?
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. Show activity on this post.