Linux/PROCESSOR-SDK-AM437X: Undefined <math.h> references cos and sin

Phillip Holtzman

Tool/software: Linux

When I include <math.h> and compile with arm-Linux-gnueabihf-gcc, the build fails because of undefined references to cos and sin. Likewise, the example Linux application whetstone.c does not build for the same reasons. Rules.make defines CFLAGS = -march=armv7-a -marm -mfpu=neon -mfloat-abi=hard

Why does the default Makefile and Rules.make not work with the example applications?

How do we include math.h for the AM437x target?

over 7 years ago

0 Kemal R. Shakir over 7 years ago

TI__Guru 55345 points

Hello Phillip,

I have just tried and confirm that I can compile the example you mentioned by running make arm-benchmarks command from the top Processor SDK directory without any issues. If the <math.h> is not found in your Processor SDK, that means the <Processor SDK>/linux-devkit/sysroots/armv7ahf-neon-linux-gnueabi/usr/include/math.h file is corrupted or it is missing. To fix this please reinstall your Processor SDK.

Best regards,
Kemal

0 Phillip Holtzman over 7 years ago in reply to Kemal R. Shakir

Intellectual 380 points

If you go to the whetstone folder and enter "make whetstone", it will fail to build.
What is the difference between the 2 builds?

0 Kemal R. Shakir over 7 years ago in reply to Phillip Holtzman

TI__Guru 55345 points

There is no such target whetstone, that is why it fails. The available targets are debug release and all. You can type make release, make debug and make all or just make. When you type make whetstone the make system tries to build whetstone.c file but it doesn't include any libs because all the library inclusions are defined under release and debug targets. The all target builds both release and debug targets.