Compiler warnings/errors on unused variables

Question

Following file: nRF5_SDK_15.2.0_9412b96/modules/nrfx/drivers/src/nrfx_saadc.c

I've now just add gcc specific unused attributes.

267c267
<     bool result;
---
>     bool result __attribute__((unused));
278c278,279
<             nrfx_err_t err_code = nrfx_saadc_channel_uninit(channel);
---
>             nrfx_err_t err_code __attribute__((unused));
>             err_code = nrfx_saadc_channel_uninit(channel);
408c409
<     bool result;
---
>     bool result __attribute__((unused));
591c592
<             bool result;
---
>             bool result __attribute__((unused));

This is just a work around. Best would be to check why gcc trips over NRFX_ASSERT.

Jørgen Holmefjord · Accepted Answer

Have you defined the preprocessor symbol DEBUG_NRF? 
 NRFX_ASSERT() is mapped to ASSERT() in nrfx_glue.h, which only perform some useful operation if this symbol is defined: 
 #if (defined(DEBUG_NRF) || defined(DEBUG_NRF_USER))
#define NRF_ASSERT_PRESENT 1
#else
#define NRF_ASSERT_PRESENT 0
#endif

//#if defined(DEBUG_NRF) || defined(DEBUG_NRF_USER)

/*lint -emacro(506, ASSERT) */ /* Suppress "Constant value Boolean */
/*lint -emacro(774, ASSERT) */ /* Suppress "Boolean within 'if' always evaluates to True" */ \

/** @brief Function for checking intended for production code.
 *
 * Check passes if "expr" evaluates to true. */

#ifdef _lint
#define ASSERT(expr) \
if (expr) \
{ \
} \
else \
{ \
 while (1); \
}
#else //_lint
#define ASSERT(expr) \
if (NRF_ASSERT_PRESENT) \
{ \
 if (expr) \
 { \
 } \
 else \
 { \
 assert_nrf_callback((uint16_t)__LINE__, (uint8_t *)__FILE__); \
 } \
}

#endif

Compiler warnings/errors on unused variables

Top Replies