Nios II Software Build Tools for Eclipse - c99 mode

[Altera_Forum]

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.

[Altera_Forum]

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]

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]

--- 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