C Link Error Undefined Symbol
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Linker Error Undefined Symbol _initgraph
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Linker Error Undefined Symbol In Module
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Linker Error Undefined Symbol _printf In Module
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After all of the input files have been read and all symbol resolution is complete, the link-editor searches the internal symbol table for any symbol references that have not been bound to symbol definitions. These symbol references undefined symbol error in c are referred to as undefined symbols. Undefined symbols can affect the link-edit process undefined symbol math according to the type of symbol, together with the type of output file being generated. Generating an Executable Output File undefined symbol c++ When generating an executable output file, the link-editor's default behavior is to terminate with an appropriate error message should any symbols remain undefined. A symbol remains undefined when a symbol reference in a http://www.codeproject.com/Questions/264025/Linker-error-in-c-program relocatable object is never matched to a symbol definition. $ cat main.c extern int foo(); int main() { return (foo()); } $ cc -o prog main.c Undefined first referenced symbol in file foo main.o ld: fatal: Symbol referencing errors. No output written to prog Similarly, if a shared object is used to create a dynamic executable and leaves an unresolved symbol definition, an undefined symbol error https://docs.oracle.com/cd/E19120-01/open.solaris/819-0690/chapter2-9/index.html results. $ cat foo.c extern int bar; int foo() { return (bar); } $ cc -o libfoo.so -G -K pic foo.c $ cc -o prog main.c -L. -lfoo Undefined first referenced symbol in file bar ./libfoo.so ld: fatal: Symbol referencing errors. No output written to prog To allow undefined symbols, as in the previous example, use the link-editor's -z nodefs option to suppress the default error condition. Note – Take care when using the -z nodefs option. If an unavailable symbol reference is required during the execution of a process, a fatal runtime relocation error occurs. This error might be detected during the initial execution and testing of an application. However, more complex execution paths can result in this error condition taking much longer to detect, which can be time consuming and costly. Symbols can also remain undefined when a symbol reference in a relocatable object is bound to a symbol definition in an implicitly defined shared object. For example, continuing with the files main.c and foo.c used in the previous example. $ cat bar.c int bar = 1; $ cc -o libbar.so -R. -G -K pic bar.c -L. -lfoo $ ldd libbar.so libfoo.so => ./lib
module It means that you have not enabled the graphics library for linking. By default this setting is error undefined symbol OFF when you install Turbo C++ version 3.0. All you need to do is, from turbo c++ menu, goto Options -> Linker -> Libraries... and check the Graphics Library option Disclaimer: This web site is for educational and informational purposes only. Click here to read the Disclaimer. Content copyright 2010-2015. Betelgeuse LLC. All rights reserved.