SES 6.32: Strange behaviour

Question

I am experiencing a strange behavior with SES 6.32, using GCC and I wonder if I should choose a different compiler.

COMPILING THIS PART OF CODE (I added line numbers for reference)

342 static void gap_params_init(void)
343 {
344 ret_code_t err_code;
345 ble_gap_conn_params_t gap_conn_params;
346 ble_gap_conn_sec_mode_t sec_mode;
347
348 BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
349
350 err_code = sd_ble_gap_device_name_set(&sec_mode,
351 (const uint8_t *)cfgGetDeviceName(),
352 strlen(cfgGetDeviceName()));

USING MY RELEASE CONFIGURATION

<configuration Name="Release"
c_preprocessor_definitions="NDEBUG"
gcc_debugging_level="None"
gcc_optimization_level="Level 1" />

--- main.c -- 346 ------------------------------------------
ble_gap_conn_sec_mode_t sec_mode;
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
err_code = sd_ble_gap_device_name_set(&sec_mode,
F001FEF6 bl 0x00029278 <cfgGetDeviceName>
4604 mov r4, r0
F001FEF3 bl 0x00029278 <cfgGetDeviceName>
F011FEEF bl 0x00039274 <strlen>
B282 uxth r2, r0
4621 mov r1, r4
A801 add r0, sp, #4
F7FFFFA2 bl 0x000273E4 <sd_ble_gap_device_name_set>

No trace of BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);

USING MY DEBUG CONFIGURATION

<configuration Name="Debug"
c_preprocessor_definitions="DEBUG"
gcc_debugging_level="Level 3"
gcc_optimization_level="None" />

--- main.c -- 344 ------------------------------------------
ret_code_t err_code;
ble_gap_conn_params_t gap_conn_params;
ble_gap_conn_sec_mode_t sec_mode;
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
F89D3004 ldrb.w r3, [sp, #4]
2201 movs r2, #1
F3620303 bfi r3, r2, #0, #4
F88D3004 strb.w r3, [sp, #4]
F89D3004 ldrb.w r3, [sp, #4]
2201 movs r2, #1
F3621307 bfi r3, r2, #4, #4
F88D3004 strb.w r3, [sp, #4]
--- main.c -- 349 ------------------------------------------
err_code = sd_ble_gap_device_name_set(&sec_mode,
(const uint8_t *)cfgGetDeviceName(),
F003FC76 bl 0x0002B0B8 <cfgGetDeviceName>
4604 mov r4, r0
--- main.c -- 352 ------------------------------------------
strlen(cfgGetDeviceName()));
F003FC73 bl 0x0002B0B8 <cfgGetDeviceName>
4603 mov r3, r0
4618 mov r0, r3
F023F857 bl 0x0004A888 <strlen>
4603 mov r3, r0
--- main.c -- 350 ------------------------------------------
err_code = sd_ble_gap_device_name_set(&sec_mode,
B29A uxth r2, r3
AB01 add r3, sp, #4
4621 mov r1, r4
4618 mov r0, r3
F7FFFF7C bl 0x000276E0 <sd_ble_gap_device_name_set>
9007 str r0, [sp, #28]

Not even constant folding, but the code works.

USING MY RELEASE CONFIGURATION AGAIN
<configuration Name="Release"
c_preprocessor_definitions="NDEBUG"
gcc_debugging_level="None"
gcc_optimization_level="Level 1" />

BUT
REPLACING: ble_gap_conn_sec_mode_t sec_mode;
WITH : static ble_gap_conn_sec_mode_t sec_mode;

--- main.c -- 348 ------------------------------------------
BLE_GAP_CONN_SEC_MODE_SET_OPEN(&sec_mode);
B510 push {r4, lr}
4C17 ldr r4, =0x20008688 <sec_mode.5>
B084 sub sp, sp, #16
2311 movs r3, #17
7023 strb r3, [r4]
--- main.c -- 349 ------------------------------------------
err_code = sd_ble_gap_device_name_set(&sec_mode,
F002FB1F bl 0x00029A40 <cfgGetDeviceName>
9001 str r0, [sp, #4]
F002FB1C bl 0x00029A40 <cfgGetDeviceName>
F015FC4C bl 0x0003CCA4 <strlen>
9901 ldr r1, [sp, #4]
B282 uxth r2, r0
4620 mov r0, r4
F7FFFFE7 bl 0x000273E4 <sd_ble_gap_device_name_set>

I have no clue about this behavior of the compiler; is someone experiencing the same problem?

I am using GCC; is any other compiler (SEGGER, SEGGER-NG or CLANG) better?