2022年7月16日 · PIC: This would work whether the code was at address 100 or 1000. 100: COMPARE REG1, REG2 101: JUMP_IF_EQUAL CURRENT+10 ... 111: NOP Non-PIC: This will only work if the code is at address 100. 100: COMPARE REG1, REG2 101: JUMP_IF_EQUAL 111 ... 111: NOP EDIT: In response to comment.

--with-pic: Try to use only PIC/non-PIC objects [default=use both]. From MySQL's cmake -LAH .:-DWITH_PIC: Generate PIC objects. That info is a good start, but leaves me with a lot of questions. From what I understand, it turns on -fPIC in the compiler, which in turn generates PIC objects in the resulting binaries/libraries. Why would I want to ...

2010年8月23日 · The `-fPIC` choice always works, but may produce larger code than `-fpic` (mnemonic to remember this is that PIC is in a larger case, so it may produce larger amounts of code). Using `-fpic` option usually generates smaller and faster code, but will have platform-dependent limitations, such as the number of globally visible symbols or the size ...

2018年2月7日 · Code that is built into shared libraries should normally but not mandatory be position independent code, so that the shared library can readily be loaded at any address in memory. The -fPIC option ensures that GCC produces such code. It is not required, thus it is not implied in -shared so GCC gives a freedom of choice. Without this option the ...

2019年1月24日 · I am trying to understand the difference between PIC (Position-independent code) and no PIC code. The test code is here. #include <stdio.h> int global; int f() { return global; } My OS is

2013年1月28日 · PIC stands for Position Independent Code. To quote man gcc: If supported for the target machine, emit position-independent code, suitable for dynamic linking and avoiding any limit on the size of the global offset table. This option makes a difference on AArch64, m68k, PowerPC and SPARC.

2014年10月9日 · Ultimate functionality of pic and pie are same but in gcc -fpic is used to create shared libraries whereas -fpie is used to for exes. No you cannot use pic for an executable. Shared libraries don't care where pie (PIE just make the exec position independent) or normal execs are using it. It is dynamic linker's (ld.so) job to link the shared ...

2014年2月22日 · Free PIC C compiler PIC16 C compiler...aaaaand noone mentions gcc*. Googling lead me only to flame wars over the forums if PICs are suitable for C, and that their (at least the 6 - series) 30 instruction assemblers are very simple to learn. Does gcc support PIC16? * - or clang or any other popular open free compiler...if there are any others...

I am confused about the concept Position Independent Executable (PIE) and Position Independent code (PIC), and I guess they are not orthogonal. The only real difference between PIE and PIC is that you are allowed to interpose symbols in PIC, but not in PIE. Except for that, they are pretty much equivalent. You can read about symbol ...

Changing the existing 47,000 lines of test scripts and makefiles which know they don't need an option to not link a PIE executable and don't need an option to not compile with PIC is not a viable solution. Couldn't we get an alternative gcc driver package with the old behavior? And use the alternatives mechanism to decide which should be the ...