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Altera_Forum's avatar
Altera_Forum
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9 years ago

Where setup compiler mode (e.g. -std=C99 or -std=C11)

Hello, Where is location in Eclipse NIOS II settings, where compiler mode can be set. For example I want to change for more advanced mode (c99 or c11) in order to allow internal loop variable...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
9 years ago

I advanced in my exploration of this issue.

Here are key points of my investigations:

  1. Setting, where the compiler options can be specified is located here: Project Properties --> Nios II Application Properties --> User flags:

  2. Options that contain the '=' sign (e.g. -std=c99) can't be set via GUI ... as interface merely reject such options !!! Perhaps tool bug

  3. The only location where it can be done (at least I've found only this way) is corresponding section in the makefile (fragment below)

# Common arguments for ALT_CFLAGSs

APP_CFLAGS_DEFINED_SYMBOLS :=

APP_CFLAGS_UNDEFINED_SYMBOLS :=

APP_CFLAGS_OPTIMIZATION := -O0

APP_CFLAGS_DEBUG_LEVEL := -g

APP_CFLAGS_WARNINGS := -Wall

APP_CFLAGS_USER_FLAGS := -std=c99