当前位置:网站首页>Introduction to the differences between compiler options of GCC dynamic library FPIC and FPIC
Introduction to the differences between compiler options of GCC dynamic library FPIC and FPIC
2022-07-06 08:33:00 【Hongyi】
The author didn't pay special attention to fPIC and fpic The difference between , Recently aarch64 A problem encountered in compiling on the server , Let yourself make a good inquiry of some information , Perhaps ordinary developers are not easy to encounter it , I hope it will be of some help to readers who are destined .
1) When dynamic library is out , Merge libnettle.a The library encountered the following error prompt
/data/compilerdir/bin/opensdk/linux64/lib/libnettle.a(fat-arm64.o): in function `fat_init': /data2/compilerdir/nettle/fat-arm64.c:198:(.text.startup+0x184): relocation truncated to fit: R_AARCH64_LD64_GOTPAGE_LO15 against symbol `_nettle_aes192_decrypt_c' defined in .text section in /data/compilerdir/bin/opensdk/linux64/lib/libnettle.a(aes192-decrypt.o)
/usr/bin/ld: /data/compilerdir/nettle/fat-arm64.c:198: warning: too many GOT entries for -fpic, please recompile with -fPIC
collect2: error: ld returned 1 exit status
/data2/compilerdir/bin/libhyscoder.so] Error 1
The key tips are
warning: too many GOT entries for -fpic, please recompile with -fPIC
Verified fpic and fPIC Compare
The same thing : Is to generate location independent code in the dynamic library . Through global offset table (GOT) Access all constant addresses . Dynamically load the program when the program starts GOT entry .
Difference : If the linked executable GOT The size exceeds the maximum value specified by the computer architecture , An error message will be reported in the compilation link , Tips -fpic It doesn't work ; So in this case , Need to use -fPIC recompile .GOT The size varies with the chip architecture ,SPARC Up for 8k, stay AArch64 Up for 28k( What the author meets is it ,GOT Limit exceeded , So wrong reporting ), stay m68k and RS / 6000 Up for 32k. and x86 There is no such restriction on .
Tips
In order to ensure the overall availability of the program during cross platform compilation , Usually, it is suggested to use fPIC
Reference source address
https://gcc.gnu.org/onlinedocs/gcc/Code-Gen-Options.html#Code-Gen-Options
The original English text ( If the above address cannot be accessed , You can refer to the following original )
-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). The dynamic loader resolves the GOT entries when the program starts (the dynamic loader is not part of GCC; it is part of the operating system). If the GOT size for the linked executable exceeds a machine-specific maximum size, you get an error message from the linker indicating that -fpic does not work; in that case, recompile with -fPIC instead. (These maximums are 8k on the SPARC, 28k on AArch64 and 32k on the m68k and RS/6000. The x86 has no such limit.)
Position-independent code requires special support, and therefore works only on certain machines. For the x86, GCC supports PIC for System V but not for the Sun 386i. Code generated for the IBM RS/6000 is always position-independent.
When this flag is set, the macros __pic__ and __PIC__ are defined to 1.
-fPIC
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.
Position-independent code requires special support, and therefore works only on certain machines.
When this flag is set, the macros __pic__ and __PIC__ are defined to 2.
边栏推荐
- Leetcode question brushing (5.28) hash table
- 2. File operation - write
- 深度剖析C语言指针
- Zhong Xuegao, who cannot be melted, cannot escape the life cycle of online celebrity products
- win10系统中的截图,win+prtSc保存位置
- Modify the video name from the name mapping relationship in the table
- 【刷题】牛客网面试必刷TOP101
- CISP-PTE实操练习讲解
- 【MySQL】数据库的存储过程与存储函数通关教程(完整版)
- swagger设置字段required必填
猜你喜欢
Sort according to a number in a string in a column of CSV file
2. File operation - write
Yyds dry goods inventory three JS source code interpretation eventdispatcher
Double pointeur en langage C - - modèle classique
目标检测——Pytorch 利用mobilenet系列(v1,v2,v3)搭建yolov4目标检测平台
2022.02.13 - NC004. Print number of loops
CISP-PTE实操练习讲解
3. File operation 3-with
Leetcode question brushing (5.28) hash table
Image, CV2 read the conversion and size resize change of numpy array of pictures
随机推荐
C language custom type: struct
Mobile Test Engineer occupation yyds dry goods inventory
2022.02.13 - NC002. sort
【ROS】usb_cam相机标定
China Light conveyor belt in-depth research and investment strategy report (2022 Edition)
Online yaml to CSV tool
[2022 广东省赛M] 拉格朗日插值 (多元函数极值 分治NTT)
vulnhub hackme: 1
深度剖析C语言数据在内存中的存储
目标检测——Pytorch 利用mobilenet系列(v1,v2,v3)搭建yolov4目标检测平台
Zhong Xuegao, who cannot be melted, cannot escape the life cycle of online celebrity products
[cloud native topic -45]:kubesphere cloud Governance - Introduction and overall architecture of enterprise container platform based on kubernetes
Cisp-pte practice explanation
3. File operation 3-with
Yyds dry goods inventory three JS source code interpretation eventdispatcher
Sort according to a number in a string in a column of CSV file
IoT -- 解读物联网四层架构
2022.02.13 - NC003. Design LRU cache structure
Use Alibaba icon in uniapp
Unified ordering background interface product description Chinese garbled