Compiler problem

xixpsychoxix · 01-16-2009, 07:00 PM

This probably isn't the right board for this, but I have Dev-C++ using MinGW and I keep getting the following error:

Linker error: undefined reference to _cpu_features_init.

Does anyone know how to solve this problem? For the record, I also use Visual C++ Express and it works just fine.

grumpy · 01-17-2009, 01:22 AM

A possible reason is that the link libraries that come with Dev-C++ are installed incorrectly. The linker needs to access a number of libraries (eg in the standard C and C++ libraries) in order to build a program and if one of these is misconfigured .....

It's also possible you have some environment variables set incorrectly, in particular things like LD_LIBRARY_PATH or similar, which the linker uses to find libraries. These are set through your IDE (eg Dev-C++) and, if so, care is needed to ensure they are correct and handle things like space characters in paths correctly. There is also an occasional inconvenience that the same environment variable can be used by different products, so the installation of one development environment might upset the working of another.

**Salem** · 01-17-2009, 01:33 AM

IIRC,
gcc prog.cpp
will trigger it.

Try
g++ prog.cpp

That is, use the C++ compiler to compiler C++ code.

Although the compiler auto-detects the language, it won't necessarily pass on all the correct linker options to link the program successfully.

cyberfish · 01-17-2009, 01:41 AM

I remember it's due to something very stupid... (needed to use it at my school)

Something like running 2 instances of Dev-C++, if not I don't remember. But I guarantee that when you found out the cause you will feel like smashing your head against the nearest wall.

xixpsychoxix · 01-17-2009, 07:12 AM

well, i have another version of MinGW installed besides just the one for Dev. I installed it some time ago. I also have DJGPP installed, which i think i remember may be very similar to MinGW? anyways, i'll try some more stuff and if anyone has any more ideas, please let me know

cyberfish · 01-17-2009, 12:46 PM

Quote:

well, i have another version of MinGW installed besides just the one for Dev.

YES, THAT'S IT!

Rename it or delete it or take it out of $PATH. Dev-C++ is getting confused.

I had my own copy of MinGW, and then installed Dev-C++ for my schoolwork, and it didn't like that.

01-16-2009, 07:00 PM	#1
xixpsychoxix Registered User Join Date: Mar 2006 Posts: 143	Compiler problem This probably isn't the right board for this, but I have Dev-C++ using MinGW and I keep getting the following error: Linker error: undefined reference to _cpu_features_init. Does anyone know how to solve this problem? For the record, I also use Visual C++ Express and it works just fine. __________________ HA! I WIN!
xixpsychoxix is offline

01-17-2009, 01:22 AM	#2
grumpy Registered User Join Date: Jun 2005 Posts: 1,343	A possible reason is that the link libraries that come with Dev-C++ are installed incorrectly. The linker needs to access a number of libraries (eg in the standard C and C++ libraries) in order to build a program and if one of these is misconfigured ..... It's also possible you have some environment variables set incorrectly, in particular things like LD_LIBRARY_PATH or similar, which the linker uses to find libraries. These are set through your IDE (eg Dev-C++) and, if so, care is needed to ensure they are correct and handle things like space characters in paths correctly. There is also an occasional inconvenience that the same environment variable can be used by different products, so the installation of one development environment might upset the working of another.
grumpy is offline

01-17-2009, 01:33 AM	#3
Salem and the hat of vanishing Join Date: Aug 2001 Location: The edge of the known universe Posts: 21,214	IIRC, gcc prog.cpp will trigger it. Try g++ prog.cpp That is, use the C++ compiler to compiler C++ code. Although the compiler auto-detects the language, it won't necessarily pass on all the correct linker options to link the program successfully. __________________ If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut. Up to 8Mb PlusNet broadband from only £5.99 a month!
Salem is offline

01-17-2009, 01:41 AM	#4
cyberfish Registered User Join Date: Dec 2006 Posts: 1,780	I remember it's due to something very stupid... (needed to use it at my school) Something like running 2 instances of Dev-C++, if not I don't remember. But I guarantee that when you found out the cause you will feel like smashing your head against the nearest wall.
cyberfish is offline

01-17-2009, 07:12 AM	#5
xixpsychoxix Registered User Join Date: Mar 2006 Posts: 143	well, i have another version of MinGW installed besides just the one for Dev. I installed it some time ago. I also have DJGPP installed, which i think i remember may be very similar to MinGW? anyways, i'll try some more stuff and if anyone has any more ideas, please let me know __________________ HA! I WIN!
xixpsychoxix is offline

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