element14 Community
element14 Community
    Register Log In
  • Site
  • Search
  • Log In Register
  • Community Hub
    Community Hub
    • What's New on element14
    • Feedback and Support
    • Benefits of Membership
    • Personal Blogs
    • Members Area
    • Achievement Levels
  • Learn
    Learn
    • Ask an Expert
    • eBooks
    • element14 presents
    • Learning Center
    • Tech Spotlight
    • STEM Academy
    • Webinars, Training and Events
    • Learning Groups
  • Technologies
    Technologies
    • 3D Printing
    • FPGA
    • Industrial Automation
    • Internet of Things
    • Power & Energy
    • Sensors
    • Technology Groups
  • Challenges & Projects
    Challenges & Projects
    • Design Challenges
    • element14 presents Projects
    • Project14
    • Arduino Projects
    • Raspberry Pi Projects
    • Project Groups
  • Products
    Products
    • Arduino
    • Avnet Boards Community
    • Dev Tools
    • Manufacturers
    • Multicomp Pro
    • Product Groups
    • Raspberry Pi
    • RoadTests & Reviews
  • Store
    Store
    • Visit Your Store
    • Choose another store...
      • Europe
      •  Austria (German)
      •  Belgium (Dutch, French)
      •  Bulgaria (Bulgarian)
      •  Czech Republic (Czech)
      •  Denmark (Danish)
      •  Estonia (Estonian)
      •  Finland (Finnish)
      •  France (French)
      •  Germany (German)
      •  Hungary (Hungarian)
      •  Ireland
      •  Israel
      •  Italy (Italian)
      •  Latvia (Latvian)
      •  
      •  Lithuania (Lithuanian)
      •  Netherlands (Dutch)
      •  Norway (Norwegian)
      •  Poland (Polish)
      •  Portugal (Portuguese)
      •  Romania (Romanian)
      •  Russia (Russian)
      •  Slovakia (Slovak)
      •  Slovenia (Slovenian)
      •  Spain (Spanish)
      •  Sweden (Swedish)
      •  Switzerland(German, French)
      •  Turkey (Turkish)
      •  United Kingdom
      • Asia Pacific
      •  Australia
      •  China
      •  Hong Kong
      •  India
      •  Korea (Korean)
      •  Malaysia
      •  New Zealand
      •  Philippines
      •  Singapore
      •  Taiwan
      •  Thailand (Thai)
      • Americas
      •  Brazil (Portuguese)
      •  Canada
      •  Mexico (Spanish)
      •  United States
      Can't find the country/region you're looking for? Visit our export site or find a local distributor.
  • Translate
  • Profile
  • Settings
Avnet Boards Forums
  • Products
  • Dev Tools
  • Avnet Boards Community
  • Avnet Boards Forums
  • More
  • Cancel
Avnet Boards Forums
Software Application Development Problems with fpu commands like sqrt atan
  • Forum
  • Documents
  • Members
  • Mentions
  • Sub-Groups
  • Tags
  • More
  • Cancel
  • New
Join Avnet Boards Forums to participate - click to join for free!
Actions
  • Share
  • More
  • Cancel
Forum Thread Details
  • State Verified Answer
  • Replies 2 replies
  • Subscribers 316 subscribers
  • Views 303 views
  • Users 0 members are here
Related

Problems with fpu commands like sqrt atan

Former Member
Former Member over 12 years ago

Trying to compile an linux demo project with using sqrt and other math functions including of math.h results in compiler errors. is there no support or what option for compiler is needed?

  • Sign in to reply
  • Cancel
  • zedhed
    0 zedhed over 12 years ago

    Hi sbuechele,

    I used 14.2 SDK to put together a quick application to test this out.

    #include <math.h>
    #include <stdio.h>

    int main()
    {
    tdouble angle = 60;
    tdouble square_number = 64;
    tdouble result = 0;

    t/* Calculate the tangent of an angle. */
    tresult = tan(angle);

    tprintf("The tangent of angle %f is %f
    ", angle, result);

    t/* Calculate the square root of a square number. */
    tresult = sqrt(square_number);

        printf("The square root of %f is %f
    ", square_number, result);

        return 0;
    }

    Sure enough, when I go to build I get the error message: "undefined reference to `sqrt'"

    I did a 'man sqrt' and realized my error right away.  The manual for these math functions show that this code must be linked against the math library by adding the '-lm' flag to your build command.

    To do this in SDK, right click on your application project and select the C/C++ Build Settings option.  Then click on the Tool Settings tab and locate the ARM Linux gcc linker-->Libraries pane and add the 'm' library.

    Not only did the application build, but I was able to run it on ZedBoard also:

    zynq> ./math_application.elf
    The tangent of angle 60.000000 is 0.320040
    The square root of 64.000000 is 8.000000

    Regards,

    -Kevin

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Reject Answer
    • Cancel
  • Former Member
    0 Former Member over 11 years ago

    thank you

    • Cancel
    • Vote Up 0 Vote Down
    • Sign in to reply
    • Verify Answer
    • Cancel
element14 Community

element14 is the first online community specifically for engineers. Connect with your peers and get expert answers to your questions.

  • Members
  • Learn
  • Technologies
  • Challenges & Projects
  • Products
  • Store
  • About Us
  • Feedback & Support
  • FAQs
  • Terms of Use
  • Privacy Policy
  • Legal and Copyright Notices
  • Sitemap
  • Cookies

An Avnet Company © 2025 Premier Farnell Limited. All Rights Reserved.

Premier Farnell Ltd, registered in England and Wales (no 00876412), registered office: Farnell House, Forge Lane, Leeds LS12 2NE.

ICP 备案号 10220084.

Follow element14

  • X
  • Facebook
  • linkedin
  • YouTube