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Altera_Forum's avatar
Altera_Forum
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13 years ago

Nios II Software Build Tools for Eclipse - c99 mode

Hi every one!

I'm using Quartus 11.0 sp1 and Nios II Software Build Tools for Eclipse with DE2-70 Altera board.

How can I configure "mingw nios ii gcc4" in eclipse to use the c99 mode? (I have other toolchains available in addition to MinGW NIOS II GCC4)

I searched the web for this topic and I found results for "Eclipse CDT". The solution is to modify the flags under: 

Project Properties > C/C++ Build > Settings > GCC C Compiler > Miscellaneous
and add -std=c99

However I didn't find such configurations with the "Nios II Software Build Tools for Eclipse".

I apologize if the question is dumb. I am still a newbie.

I appreciate any help.

Thanks in advance.

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    Why do you need to explicitly specify -std=c99?

    gcc tends to support most of c99 without it.

    Specifying -std=c99 also removes some of the gcc builtins - like alloca(), which can only really be implemeted by the compiler.
  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    using the software build tools eclipse gui

    Right Click On Project Folder in the Project Explorer

    Select Properties

    Nios II Application Properties

    User Flags: -std=c99

    With software build tools sometimes setting -std=c99 in the GUI doesn't seem to stick :mad:. I never figured out why :confused:. What I did to make it stick was to edit the projects MAKEFILE directly by setting the APP_FLAGS_USER_FLAGS to include -std=c99 .

    using the makefile (direct method)

    search for app_cflags_user_flags

    app_cflags_user_flags := -std=c99

    legacy nios ii tools

    Right Click On Project Folder in the Project Explorer (aka NIOS II C/C++ Projects tab)

    Select Properties

    Select The C/C++ Build item

    Tool Settings Tab

    NIOS II Compiler-->General Folder

    Compiler Flags: -std=c99
  • Altera_Forum's avatar
    Altera_Forum
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    11 years ago

    --- Quote Start ---

    using the software build tools eclipse gui

    Right Click On Project Folder in the Project Explorer

    Select Properties

    Nios II Application Properties

    User Flags: -std=c99

    With software build tools sometimes setting -std=c99 in the GUI doesn't seem to stick :mad:. I never figured out why :confused:. What I did to make it stick was to edit the projects MAKEFILE directly by setting the APP_FLAGS_USER_FLAGS to include -std=c99 .

    using the makefile (direct method)

    search for app_cflags_user_flags

    app_cflags_user_flags := -std=c99

    --- Quote End ---

    Yes, setting -std=c99 in the GUI doesn't seem to stick in Q13.1

    http://www.altera.com/support/kdb/solutions/rd10132014_789.html