Linker Error Undefined Reference In C
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Error Undefined Reference To C++
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Undefined Reference To Function C++
just like you, helping each other. Join them; it only takes a minute: Sign up Undefined reference to '_*' linker error up vote 0 down vote favorite I am having trouble compiling/linking the following C code. The linker throws errors that look like the following: pso.o:pso.c:(.text+0x41): undefined reference to '_ps' ... pso.o:pso.c:(.text+0x93): more undefined references to linker error c++ '_ps' follow This is my first time writing C code for gcc, so I'm unsure how to fix this problem. I am assuming that because struct PS is defined my header file, it is somehow not linked to pso.c. However, I did use a #include "ps.h" statement at the top of that source file. I have included the relevant source files and header file below, as well as the make file I am using. Is there a fundamental concept I am missing for writing linkable C code? Thank you! Oh, and it's a particle swarm optimizer, if you were wondering :) The main.c file: #define MAIN #include
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Undefined Reference Error In C Compilation
answers to any questions you might have Meta Discuss the c++ linker error unresolved external symbol workings and policies of this site About Us Learn more about Stack Overflow the company how to solve undefined reference error in c Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the http://stackoverflow.com/questions/15257120/undefined-reference-to-linker-error Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up “undefined reference to” errors when linking static C library with C++ code up vote 17 down vote favorite 6 I have a http://stackoverflow.com/questions/18877437/undefined-reference-to-errors-when-linking-static-c-library-with-c-code test file (just for the link test) where I overload the new/delete operators with my own malloc/free library called libxmalloc.a. But I keep getting "underdefined reference to" error as following when linking the static library, even I change the order of test.o and -lxmalloc. But everything works well with other C programs linking this library. I'm so confused with this issue and appreciate any clue. Error MSg: g++ -m64 -O3 -I/usr/include/ethos -I/usr/include/nacl/x86_64 -c -o test.o test.cpp g++ -m64 -O3 -L. -o demo test.o -lxmalloc test.o: In function `operator new(unsigned long)': test.cpp:(.text+0x1): undefined reference to `malloc(unsigned long)' test.o: In function `operator delete(void*)': test.cpp:(.text+0x11): undefined reference to `free(void*)' test.o: In function `operator new[](unsigned long)': test.cpp:(.text+0x21): undefined reference to `malloc(unsigned long)' test.o: In function `operator delete[](void*)': test.cpp:(.text+0x31): undefined reference to `free(void*)' test.o: In function `main': test.cpp:(.text.startup+0xc): undefined reference to `malloc(unsigned long)' test.cpp:(.text.startup+0x19): undefined reference to `malloc(unsigned long)' test.cpp:(.text.startup+0x24): undefined referen
Programming Boards C++ Programming linker error undefined reference to Getting started with C or C++ | C Tutorial | C++ Tutorial | http://cboard.cprogramming.com/cplusplus-programming/90936-linker-error-undefined-reference.html C and C++ FAQ | Get a compiler | Fixes for common https://community.nxp.com/thread/389070 problems Thread: linker error undefined reference to Thread Tools Show Printable Version Email this Page… Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 06-18-2007 #1 BJtoVisualcC++ View Profile View Forum Posts Registered User Join Date Jun 2007 Posts 61 linker error undefined reference undefined reference to I am getting errors saying linker error undefined reference to (function name) what does this mean? How can I correct it? 06-18-2007 #2 robwhit View Profile View Forum Posts Registered User Join Date Oct 2001 Posts 2,129 it means you didn't write out what that function did, or you didn't link in the correct library. 06-18-2007 #3 Salem View Profile View Forum error undefined reference Posts and the hat of int overfl Join Date Aug 2001 Location The edge of the known universe Posts 34,493 It means one of these (typically) - you need to write the function. - you need to check the spelling - C++ is case sensitive, so 'foo' is different from 'Foo'. - you need to check the parameters - declaring foo(int a) and defining foo(double a) are different functions. - you forgot to specify the name of a library. If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut. If at first you don't succeed, try writing your phone number on the exam paper. 06-18-2007 #4 Daved View Profile View Forum Posts Registered User Join Date Jan 2005 Posts 7,363 It could also mean that you forgot to include in the project the file that has the function definition. Or if the function is a member function of a class, perhaps you forgot the ClassName:: in the definition. Quick Navigation C++ Programming Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums General Progr
it enabled. Please turn JavaScript back on and reload this page.More questions in LPCXpresso IDE FAQs Where is this place located?NXP CommunityAll PlacesLPCXpresso IDELPCXpresso IDE FAQsLog in to create and rate content, and to follow, bookmark, and share content with other members.AnsweredAssumed AnsweredLinker error "Undefined reference to 'xxx' "Question asked by LPCware Support on Mar 31, 2016Like • Show 0 Likes0 Comment • 0The simplest reason for seeing undefined references when linking is that there is a problem with your own code base. For example, you may have misspelt the name of one of the functions that you call, or you may not have linked in a library project. However a very common reason for such errors is that you are linking with the wrong C library variant!If you linking against the Newlib(none) or Redlib(none) C library variants and are using functions from the C library such as printf or malloc you will get errors about undefined references when linking. Fuller examples of these error messages can be seen lower down this FAQ.In such circumstances you will need to change which variant of the C library you are linking:Redlib: to resolve the the undefined references, use:Redlib(nohost), orRedlib(semihost)Newlib: to resolve the the undefined references, use:Newlib(nohost), orNewlib(semihost)Details of how to do this can be found in the FAQ "Switching the selected C library".For an explanation of the library variants, please see the FAQ "What are none, nohost and semihost libraries?".Undefined references with RedlibThe below is an example set of errors encountered when linking an application that calls printf() using Redlib...In function `printf':fpprintf.c:(.text.printf+0x36): undefined reference to `__sys_write'In function `__flsbuf':_deferredlazyseek.c:(.text.(float, long, short, bool, float __restrict)+0x92): undefined reference to `__sys_istty'In function `_Cwritebuf':_writebuf.c:(.text._Cwritebuf+0x18): undefined reference to `__sys_flen'_writebuf.c:(.text._Cwritebuf+0x2e): undefined reference to `__sys_seek'_writebuf.c:(.text._Cwritebuf+0x56): undefined reference to `__sys_write'In function `malloc':alloc.c:(.text.malloc+0x70): undefined reference to `_sbrk'alloc.c:(.text.malloc+0x92): und