pragma GCC optimize("O0") issue

Hello,

I use arm-cortexm4 microcontroller which is stm32f303.
The arm gcc compiler version is 5.4 2016q2.
Code development envirment is Eclipse/STM32 AC6.

I have tryed to use optimize level3(-O3) in whole project expect 1 file. Then used optimize pragma code to change optimizing level for aaaa.c file like below.

#pragma GCC push_options
#pragma GCC optimize("O0")

#includes ....
Source codes...
//End of the code
#pragma GCC pop_options

After compiling the related make file output is:

# Add inputs and outputs from these tool invocations to the build variables
C_SRCS += \
../Menu/LcdDriver/hd44780.c

OBJS += \
./Menu/LcdDriver/hd44780.o

C_DEPS += \
./Menu/LcdDriver/hd44780.d

# Each subdirectory must supply rules for building sources it contributes
Menu/LcdDriver/%.o: ../Menu/LcdDriver/%.c
 @echo 'Building file: $<'
 @echo 'Invoking: MCU GCC Compiler'
 @echo %cd%
 arm-none-eabi-gcc -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DSTM32F30 -DSTM32F3 -DSTM32F303VBTx -DSTM32 -DDEBUG -DUSE_HAL_DRIVER -DSTM32F303xC -I"E:/workspace_ac6/CCS3010/inc" -I"E:/workspace_ac6/CCS3010/CMSIS/core" -I"E:/workspace_ac6/CCS3010/CMSIS/device" -I"E:/workspace_ac6/CCS3010/HAL_Driver/Inc/Legacy" -I"E:/workspace_ac6/CCS3010/HAL_Driver/Inc" -I"E:/workspace_ac6/CCS3010/ACAnalyzer" -I"E:/workspace_ac6/CCS3010/AuxInput" -I"E:/workspace_ac6/CCS3010/AuxOutput" -I"E:/workspace_ac6/CCS3010/Compressor" -I"E:/workspace_ac6/CCS3010/External_Storage" -I"E:/workspace_ac6/CCS3010/Fault" -I"E:/workspace_ac6/CCS3010/HardwareInit" -I"E:/workspace_ac6/CCS3010/Language" -I"E:/workspace_ac6/CCS3010/Parameters" -I"E:/workspace_ac6/CCS3010/FreeRTOSv9.0.0" -I"E:/workspace_ac6/CCS3010/FreeRTOSv9.0.0/FreeRTOS/Source/include" -I"E:/workspace_ac6/CCS3010/TestModules" -I"E:/workspace_ac6/CCS3010/SimpleAlgorithms" -I"E:/workspace_ac6/CCS3010/Compressor/CompressorFixed" -I"E:/workspace_ac6/CCS3010/Menu" -I"E:/workspace_ac6/CCS3010/ServiceTimes" -I"E:/workspace_ac6/CCS3010/Log" -I"E:/workspace_ac6/CCS3010/Menu/LcdDriver" -I"E:/workspace_ac6/CCS3010/Keypad" -I"E:/workspace_ac6/CCS3010/SystemAlarms" -O3 -g3 -fmessage-length=0 -ffunction-sections -c -MMD -MP -MF"$(@:%.o=%.d)" -MT"$@" -o "$@" "$<"
 @echo 'Finished building: $<'
 @echo ' '

As you can see here optimizing leve still -O3.
How can I change it to -O0?