Gcc Compiler Error Undefined Reference
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How To Solve Undefined Reference Error In C
x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Linker error on Linux: “undefined reference to” up vote 10 down vote favorite 1 I am able undefined reference c++ to make a shared library without problems. I create libcbitcoin.so (with no errors) and attempt to link against it with an executable as well as OpenSSL libraries. I use this command: gcc -L/media/sf_BitEagle_Projects/cbitcoin/build/bin -lcbitcoin \ -Wl-rpath,/media/sf_BitEagle_Projects/cbitcoin/build/bin -lssl -lcrypto \ -L/usr/local/ssl/lib/ -o /media/sf_BitEagle_Projects/cbitcoin/build/bin/testCBAddress \ /media/sf_BitEagle_Projects/cbitcoin/build/obj/testCBAddress.o \ /media/sf_BitEagle_Projects/cbitcoin/build/obj/CBOpenSSLCrypto.o The bin directory is the location of the library. The obj directory has the object files I wish to link into an executable. In the command I use the -L, -l and -rpath options which I thought was all that is needed for linking in linux. It seems I am wrong since I get errors like: /media/sf_BitEagle_Projects/cbitcoin/test/testCBAddress.c:40: undefined reference to `CBNewByteArrayFromString' CBNewByteArrayFromString is found in the library. For some reason it is not being linked. OpenSSL too: /media/sf_BitEagle_Projects/cbitcoin/dependencies/crypto/CBOpenSSLCrypto.c:37: undefined reference to `SHA1' How do I get the linking to work? GCC version: gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4
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C Undefined Reference To Function In Header File
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C Undefined Reference To Pthread_create
C error: undefined reference to function, but it IS defined up vote 23 down vote favorite 8 Just a simple program, but I keep getting this compiler error. I'm using MinGW for the compiler. Here's the header file, point.h: //type for a http://stackoverflow.com/questions/12272864/linker-error-on-linux-undefined-reference-to Cartesian point typedef struct { double x; double y; } Point; Point create(double x, double y); Point midpoint(Point p, Point q); And here's point.c: //This is the implementation of the point type #include "point.h" int main() { return 0; } Point create(double x, double y) { Point p; p.x = x; p.y = y; return p; } Point midpoint(Point p, Point q) { Point mid; mid.x = (p.x + q.x) / 2; mid.y = (p.y + q.y) / 2; return mid; } And here's where http://stackoverflow.com/questions/5559250/c-error-undefined-reference-to-function-but-it-is-defined the compiler issue comes in. I keep getting: testpoint.c: undefined reference to 'create(double x, double y)' While it is defined in point.c. This is a separate file called testpoint.c: #include "point.h" #include
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