Tag: symbol

undefined symbol error in ld.lld

Error reporting When compiling the code for Android 12, I encountered the following error, indicating that the following symbols could not be found when linking libpdfium.so: CPDF_StreamContentParser::~CPDF_StreamContentParser() CPDF_StreamContentParser::CPDF_StreamContentParser(CPDF_Document*, CPDF_Dictionary*, CPDF_Dictionary*, CFX_Matrix const*, CPDF_PageObjectHolder*, CPDF_Dictionary*, CFX_FloatRect const &, CPDF_AllStates const*, std::__1::set) CPDF_StreamContentParser::Parse(unsigned char const, unsigned int, unsigned int, unsigned int, std::__1::vector const & amp;) FAILED: //external/pdfium:libpdfium […]

VS reports an unresolved external symbol error….

VS reported an error about an unresolved external symbol… When we use the VS compiler to write C code and run it, we are prompted: Severity Code Description Project File Line Suppressed Status Error LNK2019 Unresolved external symbol _main, function “int __cdecl invoke_main(void)” (?invoke_main@@YAHXZ) The symbol StudyCProject is referenced E:\VisualStudioProjects\StudyCProject\StudyCProject\MSVCRTD.lib(exe_main.obj) 1 Possible reasons: There are […]

Playing with Shell Symbols

Transfer: http://hi.baidu.com/hellosimple/item/21b31dfefd23e811e2e3bd47 The special symbols commonly used in the shell are listed below: # ; ;; . , / \ &#39;string &#39;| ! $ ${} $? $$ $* “string”* ** ? : ^ $# $@ `command`{} [] [[]] () (()) || & amp; & amp; {xx,yy,zz,…}~ ~ + ~- & amp; \<…\> + – %= […]

ARM assembly instruction set – three symbols in assembly (assembly instructions, pseudo instructions, pseudo operations), basic assembly format, data operation instructions, jump instructions, special function register operation instructions, memory operation instructions, hybrid programming

Table of Contents 1. Three symbols in assembly (assembly instructions, pseudo-instructions, pseudo-operations) 2. Basic format of assembly 3. Data operation instructions 3.1 Data movement instructions mov/mvn ① Example ② Immediate number 3.2 Shift operation instructions lsl/lsr/asr/ror Example 3.3 Bit operation instructions and/orr/eor/bic ① Example 1 ② Example 2 3.4 Arithmetic operation instructions add/adc/sub/sbc/mul ① Implement […]

Implementation principle of dump_stack in the kernel (2) – symbol

Environment Linux-4.14 Aarch64 Text In the previous analysis, when calling print_symbol(“PC is at %s\\ “, instruction_pointer(regs)) to output the current PC address, the output content is: PC is at demo_init + 0xc/0x1000 [demo ] Let’s analyze this function print_symbol. 1 static __printf(1, 2) 2 void __check_printsym_format(const char *fmt, …) 3 { 4} 5 6 static […]

[Kernel driver] Kernel module transfer participates in symbol sharing

00. Directory Article directory 00. Table of Contents 01. Overview 02. module_param 03. Symbol sharing code 04. Program example 05. To be continued 06. Appendix 01. Overview As an extensible dynamic module, the kernel module provides flexibility to the Linux kernel, but sometimes we need to pass different parameters to the kernel according to different […]

m Matlab simulation of audio signal synchronization receiver based on 16QAM modulation, including gardner symbol synchronization, carrier synchronization and CMA equalization

Table of Contents 1. Algorithm simulation effect 2. Summary of theoretical knowledge involved in algorithms 3.MATLAB core program 4. Complete algorithm code file 1. Algorithm simulation effect The matlab2022a simulation results are as follows: Constellation diagram changes during the locking process: Timing convergence curve: Carrier synchronization convergence curve: 2. Summary of theoretical knowledge involved in […]