Get the GCC source

// Assisted by WCA@IBM // Latest GenAI contribution: ibm/granite-20b-code-instruct-v2

git clone https://github.com/open-power/ppe42-gcc.git -b gcc-4_9_2-ppe42

Get the binutils source

git clone https://github.com/open-power/ppe42-binutils -b binutils-2_24-ppe42

Compile to CTE tools (or other location)

Note: GCC has hard-coded locations. If you copy the generated gcc binaries to a different location other than where it was compiled, some of the internal internal links will still point back to the location where gcc was compiled.

Set the environment variable PREFIX to the location where the generated gcc will reside. The example is for CTE ppetools. If compiled here the generated toolchain will be replicated overnight to all CTE tool site locations.

export PREFIX=/afs/apd/projects/cte/tools/ppetools/prod/

export TARGET=powerpc-eabi

Compile Dependencies

The tool-chain requires gmp at least version 4.3.2, mpfr at least at version 2.4.2, mpc at least version 0.8.1; If not, then they must be built. If any of these dependencies are required then be sure to set/add to LD_LIBRARY_PATH=$(PREFIX)/lib before running any tool-chain executables.

Compile ppe42 tool chain

binutils

Using LDFLAGS="-all-static" causes the the executable to have all depenent libs compiled in to the executable making it relocatable. This is desired when delivering to CTE, but not needed otherwise. If the flag is not specified, then linkable libraries are generated, some of which are needed for SIMICS when new asm instructions are added. (libbfd-2.24.so and libopcodes-2.24.so)

From the ppe42-binutils source directory:

mkdir ../build_binutils
cd ../build_binutils
rm -Rf *
../ppe42-binutils/configure --enable-shared --enable-64-bit-bfd --target=$TARGET --prefix=$PREFIX -v
make configure-host
make LDFLAGS=-all-static MAKEINFO=true CFLAGS+=-Wno-implicit-fallthrough CFLAGS+=-Wno-error=cast-function-type CFLAGS+=-Wno-error=stringop-truncation CFLAGS+=-Wno-error=pointer-compare
make MAKEINFO=true install

GCC

Download these patches:

• https://github.com/open-power/op-build/blob/master/openpower/package/ppe42-gcc/0001-2016-02-19-Jakub-Jelinek-jakub-redhat.com.patch
• https://github.com/open-power/op-build/blob/master/openpower/package/ppe42-gcc/0001-reload-Change-to-type-of-x_spill_indirect_levels.patch

From the ppe42-gcc directory:

patch -p 1 -i 0001-2016-02-19-Jakub-Jelinek-jakub-redhat.com.patch
patch -p 1 -i 0001-reload-Change-to-type-of-x_spill_indirect_levels.patch

mkdir ../build_gcc
cd ../build_gcc
rm -Rf *
../ppe42-gcc/configure --target=$TARGET --prefix=$PREFIX --without-headers --with-newlib --with-gnu-as --with-gnu-ld --disable-doc --disable-pod2man
make configure-host
make  MAKEINFO=true all-gcc
make  MAKEINFO=true install-gcc

FLAGS to use when compiling

C FLAGS

PPE_CFLAGS =  -Wall -Werror
PPE_CFLAGS += -fsigned-char
PPE_CFLAGS += -msoft-float
PPE_CFLAGS += -meabi
PPE_CFLAGS += -msdata=eabi
PPE_CFLAGS += -ffreestanding
PPE_CFLAGS += -fno-common
PPE_CFLAGS += -fno-inline-functions-called-once
PPE_CFLAGS += -Os
PPE_CFLAGS += -gpubnames -gdwarf-3
PPE_CFLAGS += -ffunction-sections
PPE_CFLAGS += -fdata-sections
PPE_CFLAGS += -mcpu=ppe42x   # for older hw (p8,p9) use -mcpu=ppe42
PPE_CFLAGS += -mstrict-align
PPE_CFLAGS += -pipe
PPE_CFLAGS += -mmulhw  #Only on PPE42X

C++ aditional flags

PPE_CXXFLAGS = -std=c++11
PPE_CXXFLAGS += -nostdinc++
PPE_CXXFLAGS += -fno-rtti
PPE_CXXFLAGS += -fno-threadsafe-statics
PPE_CXXFLAGS += -fno-strict-aliasing
PPE_CXXFLAGS += -fno-exceptions

Assembler

ASFLAGS = -mppe42x   ## for older hw (P8,P9) use -mppe42