arm hard float point

[allen_kim1]

Dear Community 

i have a question about arm hard float point option 

we need arm float point option on LTIB tool chain 

i write some example code and compile with  LTIB , yocto 

binary that compiled with LTIB has no FLAGS (  hard-float ABI ) 

binary that compiled with yocto  has a  hard-float ABI FLAGS

LTIB latest toolchain ( 20130816 version )

/opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-gcc -c float_sum.cpp  -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 /opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi-gcc  -o float_test float_sum.o float_test.cpp  -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 -lpthread allen_kim@host:~/test_hf/src$ readelf  -h float_test ELF Header:   Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00   Class:                             ELF32   Data:                              2's complement, little endian   Version:                           1 (current)   OS/ABI:                            UNIX - System V   ABI Version:                       0   Type:                              EXEC (Executable file)   Machine:                           ARM   Version:                           0x1   Entry point address:               0x83c4   Start of program headers:          52 (bytes into file)   Start of section headers:          2396 (bytes into file)   Flags:                             0x5000002, has entry point, Version5 EABI   Size of this header:               52 (bytes)   Size of program headers:           32 (bytes)   Number of program headers:         8   Size of section headers:           40 (bytes)   Number of section headers:         30   Section header string table index: 27

yocto 4.1.15 toolchain

/opt/fsl-imx-fb/4.1.15-1.1.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -c float_sum.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 --sysroot=/opt/fsl-imx-fb/4.1.15- 1.1.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/ /opt/fsl-imx-fb/4.1.15-1.1.1/sysroots/x86_64-pokysdk-linux/usr/bin/arm-poky-linux-gnueabi/arm-poky-linux-gnueabi-gcc -o float_test_yocto float_sum.o float_test.cpp -march=armv7-a -mfloat-abi=hard -mfpu=neon -mtune=cortex-a9 -lpthread --sysroot=/opt/fsl-imx-fb/4.1.15-1.1.1/sysroots/cortexa9hf-vfp-neon-poky-linux-gnueabi/ allen_kim@host:~/test_hf/src$ readelf  -h float_test_yocto ELF Header:   Magic:   7f 45 4c 46 01 01 01 00 00 00 00 00 00 00 00 00   Class:                             ELF32   Data:                              2's complement, little endian   Version:                           1 (current)   OS/ABI:                            UNIX - System V   ABI Version:                       0   Type:                              EXEC (Executable file)   Machine:                           ARM   Version:                           0x1   Entry point address:               0x10444   Start of program headers:          52 (bytes into file)   Start of section headers:          9228 (bytes into file)   Flags:                             0x5000402, has entry point, Version5 EABI, hard-float ABI   Size of this header:               52 (bytes)   Size of program headers:           32 (bytes)   Number of program headers:         8   Size of section headers:           40 (bytes)   Number of section headers:         39   Section header string table index: 36

how can i support hard-float ABI in LTIB crosstool chain ?

please guide me 

Thanks BR

[Yuri]

Hello

  I hope the following helps.

https://community.nxp.com/message/862949 

Have a great day,
Yuri

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