Code Sourcery G++ Lite

Sourcery CodeBench Lite Edition

Unless you:

1. Already got a GCC toolchain as part of an SDK
2. Are hacking on GCC yourself
3. Work for a microprocessor design company
4. You need an ARMv7 toolchain that uses the armv7hf hard floating point ABI (try Linaro)

you probably want to use CodeSourcery G++ Light to start embedded Linux or Non-OS development. CodeSourcery does a lot of upstream gcc, binutils, eglibc, gdb, qemu work and they test their toolchains.

Read Chapter 3 of {arm,ia32,mips}-2012.03/share/doc/*/pdf/getting-started.pdf for the command line options to choose the correct:

• architecture (arm: -mcpu cortex-a9, x86_64: -m64)
• endianess (mipsel: -EL)
• floating point ABI (mips: -msoft-float, arm VFPv3 with NEON: -mfloat-abi=softfp -mfpu=neon) and
• C library (mips: -muclibc)

Use "gcc -print-multi-directory" to print the directory name of the "multilib" variant you want and copy it to your embedded device.

Here's a table of the configurations supported:

arm-2012.03
ARMv5TE - Little-Endian, Soft-Float, GLIBC
Command-line option(s):     default (-march=armv5te)
	Sysroot subdirectory:       ./
	Dynamic linker:             lib/ld-linux.so.3
ARMv4T - Little-Endian, Soft-Float, GLIBC
Command-line option(s):      -march=armv4t
	Sysroot subdirectory:        armv4t/
	Dynamic linker:              lib/ld-linux.so.3
	Notes:                       This should also be used for ARMv5T cores such as the ARM1020T.
ARMv7-A Thumb-2 - Little-Endian, Soft-Float, GLIBC
Command-line option(s):      -mthumb -march=armv7-a
	Sysroot subdirectory:        thumb2/
	Dynamic linker:              lib/ld-linux.so.3
NOTE: while the compiler supports the "hard float" ABI (-mfloat-abi=hard)
no compatible runtime libraries are provided in the Lite version. 
Get the Linaro toolchain linked to below if you want hard float ABI support.

mips-2012.03
MIPS32 revision 2 - Big-Endian, O32
Command-line option(s):        default
	Sysroot subdirectory:          ./
	Dynamic linker:                lib/ld.so.1
MIPS32 revision 2 - Big-Endian, N64
Command-line option(s):        -mabi=64
	Sysroot subdirectory:          ./
	Dynamic linker:                lib64/ld.so.1
MIPS32 revision 2 - Little-Endian, O32
Command-line option(s):        -EL
	Sysroot subdirectory:          el/
	Dynamic linker:                lib/ld.so.1
MIPS32 revision 2 - Little-Endian, N64
Command-line option(s):        -EL -mabi=64
	Sysroot subdirectory:          el/
	Dynamic linker:                lib64/ld.so.1
MIPS32 revision 2 - Big-Endian, Soft-Float, O32
Command-line option(s):        -msoft-float
	Sysroot subdirectory:          soft-float/
	Dynamic linker:                lib/ld.so.1
MIPS32 revision 2 - Big-Endian, Soft-Float, N64
Command-line option(s):        -msoft-float -mabi=64
	Sysroot subdirectory:          soft-float/
	Dynamic linker:                lib64/ld.so.1
MIPS32 revision 2 - Little-Endian, Soft-Float, O32
Command-line option(s):        -EL -msoft-float
	Sysroot subdirectory:          soft-float/el/
	Dynamic linker:                lib/ld.so.1
< ... microMIPs: -mmicroimps, MIPS16: -mips16 ...>
MIPS32 revision 2 - uClibc, Big-Endian, O32
Command-line option(s):        -muclibc
	Sysroot subdirectory:          uclibc/
	Dynamic linker:                lib/ld-uClibc.so.0
MIPS32 revision 2 - uClibc, Little-Endian, O32
Command-line option(s):        -muclibc -EL
	Sysroot subdirectory:          uclibc/el/
	Dynamic linker:                lib/ld-uClibc.so.0
MIPS32 revision 2 - uClibc, Big-Endian, Soft-Float, O32
Command-line option(s):        -muclibc -msoft-float
	Sysroot subdirectory:          uclibc/soft-float/
	Dynamic linker:                lib/ld-uClibc.so.0
MIPS32 revision 2 - uClibc, Little-Endian, Soft-Float, O32
Command-line option(s):        -muclibc -EL -msoft-float
	Sysroot subdirectory:          uclibc/soft-float/el/
	Dynamic linker:                lib/ld-uClibc.so.0


ia32-2012.03
Intel Pentium 4 - GLIBC, 32-bit
Command-line option(s):       default
	Sysroot subdirectory:         ./
	Dynamic linker:               lib/ld-linux.so.2
Intel Xeon (Nocona) - GLIBC, 64-bit
Command-line option(s):       -m64
	Sysroot subdirectory:         ./
	Dynamic linker:               lib64/ld-linux-x86-64.so.2
Intel Atom - GLIBC, 32-bit
Command-line option(s):       -march=atom
	Sysroot subdirectory:         atom/
	Dynamic linker:               lib/ld-linux.so.2
Intel Core 2 - GLIBC, 64-bit
Command-line option(s):       -march=core2 -m64
	Sysroot subdirectory:         core2/
	Dynamic linker:               lib64/ld-linux-x86-64.so.2

Remote Debugging

• (gdb) set sysroot SYSROOT-SUBDIRECTORY
  • This helps GDB find the debuginfo and allows you to strip the copy on your target device.

See Also

• Cross Compiling
• Cross Compiling for Windows and Mac on a Linux Host
• System Programming
• Linaro Toolchain Binaries -- armv7hf toolschain that can target the ARM versions of Ubuntu, Fedora etc.

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