[Nexus 5 Q&A, Help & Troubleshooting] dekefake:
Ey !

Im currently trying to build Euphoria OS for Nexus 5 using

arm-cortex_a15-linux-gnueabihf-linaro_4.9.3-2015.03

toolchain from here.

I edited /build/envsetup.sh file like it :

# The gcc toolchain does not exists for windows/cygwin. In this case, do not reference it.
export ANDROID_TOOLCHAIN=
export ANDROID_TOOLCHAIN_2ND_ARCH=
local ARCH=$(get_build_var TARGET_ARCH)
case $ARCH in
x86) toolchaindir=x86/x86_64-linux-android-$targetgccversion/bin
;;
x86_64) toolchaindir=x86/x86_64-linux-android-$targetgccversion/bin
;;
arm) toolchaindir=arm/arm-cortex_a15-linux-gnueabihf-$targetgccversion/bin
;;
arm64) toolchaindir=aarch64/aarch64-linux-android-$targetgccversion/bin;
toolchaindir2=arm/arm-linux-androideabi-$targetgccversion2/bin
;;
mips|mips64) toolchaindir=mips/mips64el-linux-android-$targetgccversion/bin
;;
*)
echo "Can't find toolchain for unknown architecture: $ARCH"
toolchaindir=xxxxxxxxx
;;
esac
if [ -d "$gccprebuiltdir/$toolchaindir" ]; then
export ANDROID_TOOLCHAIN=$gccprebuiltdir/$toolchaindir
fi

if [ -d "$gccprebuiltdir/$toolchaindir2" ]; then
export ANDROID_TOOLCHAIN_2ND_ARCH=$gccprebuiltdir/$toolchaindir2
fi

unset ANDROID_KERNEL_TOOLCHAIN_PATH
case $ARCH in
arm)
# Legacy toolchain configuration used for ARM kernel compilation
toolchaindir=arm/arm-cortex_a15-linux-gnueabihf-$targetgccversion/bin
if [ -d "$gccprebuiltdir/$toolchaindir" ]; then
export ARM_EABI_TOOLCHAIN="$gccprebuiltdir/$toolchaindir"
ANDROID_KERNEL_TOOLCHAIN_PATH="$ARM_EABI_TOOLCHAIN":
fi
;;
*)
# No need to set ARM_EABI_TOOLCHAIN for other ARCHs
;;
esac

LINE 136 TO 178

I edited too, /build/core/combo/TARGET_linux-arm.mk, like it :

# Decouple NDK library selection with platform compiler version
$(combo_2nd_arch_prefix)TARGET_NDK_GCC_VERSION := linaro_4.9.3-2015.03

ifeq ($(strip $(TARGET_GCC_VERSION_EXP)),)
$(combo_2nd_arch_prefix)TARGET_GCC_VERSION := linaro_4.9.3-2015.03

LINE 37 TO 41

Then, i face this error :

thomas@thomas-Building:~$ cd '/home/thomas/Bureau/Euphoria-OS'
thomas@thomas-Building:~/Bureau/Euphoria-OS$ . build/envsetup.sh
including device/moto/shamu/vendorsetup.sh
including device/asus/tilapia/vendorsetup.sh
including device/asus/grouper/vendorsetup.sh
including device/asus/fugu/vendorsetup.sh
including device/asus/flo/vendorsetup.sh
including device/asus/deb/vendorsetup.sh
including device/samsung/manta/vendorsetup.sh
including device/lge/hammerhead/vendorsetup.sh
including device/lge/mako/vendorsetup.sh
including device/generic/mini-emulator-x86_64/vendorsetup.sh
including device/generic/mini-emulator-arm64/vendorsetup.sh
including device/generic/mini-emulator-mips/vendorsetup.sh
including device/generic/mini-emulator-x86/vendorsetup.sh
including device/generic/mini-emulator-armv7-a-neon/vendorsetup.sh
including device/htc/flounder/vendorsetup.sh
including vendor/eos/vendorsetup.sh
including sdk/bash_completion/adb.bash
thomas@thomas-Building:~/Bureau/Euphoria-OS/$ brunch hammerhead
including vendor/eos/vendorsetup.sh

============================================
PLATFORM_VERSION_CODENAME=UNOFFICIAL
PLATFORM_VERSION=5.1.1
ROM_VERSION=1.1-hammerhead-UNOFFICIAL-20150708
TARGET_PRODUCT=eos_hammerhead
TARGET_BUILD_VARIANT=userdebug
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
TARGET_CPU_VARIANT=krait
TARGET_GCC_VERSION=linaro_4.9.3-2015.03
TARGET_NDK_GCC_VERSION=linaro_4.9.3-2015.03
TARGET_KERNEL_TOOLCHAIN=linaro_4.9.3-2015.03
HOST_ARCH=x86_64
HOST_OS=linux
HOST_OS_EXTRA=Linux-3.16.0-30-generic-x86_64-with-Ubuntu-14.04-trusty
HOST_BUILD_TYPE=release
BUILD_ID=LYZ28E
OUT_DIR=/home/thomas/Bureau/Euphoria-OS/out
============================================

============================================
PLATFORM_VERSION_CODENAME=UNOFFICIAL
PLATFORM_VERSION=5.1.1
ROM_VERSION=1.1-hammerhead-UNOFFICIAL-20150708
TARGET_PRODUCT=eos_hammerhead
TARGET_BUILD_VARIANT=userdebug
TARGET_BUILD_TYPE=release
TARGET_BUILD_APPS=
TARGET_ARCH=arm
TARGET_ARCH_VARIANT=armv7-a-neon
TARGET_CPU_VARIANT=krait
TARGET_GCC_VERSION=linaro_4.9.3-2015.03
TARGET_NDK_GCC_VERSION=linaro_4.9.3-2015.03
TARGET_KERNEL_TOOLCHAIN=linaro_4.9.3-2015.03
HOST_ARCH=x86_64
HOST_OS=linux
HOST_OS_EXTRA=Linux-3.16.0-30-generic-x86_64-with-Ubuntu-14.04-trusty
HOST_BUILD_TYPE=release
BUILD_ID=LYZ28E
OUT_DIR=/home/thomas/Bureau/Euphoria-OS/out
============================================
find: `dummy': No such file or directory
build/core/Makefile:47: warning: overriding commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/etc/permissions/android.software.live_wallpaper.xml'
build/core/base_rules.mk:552: warning: ignoring old commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/etc/permissions/android.software.live_wallpaper.xml'
build/core/Makefile:47: warning: overriding commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/lib/hw/gps.msm8974.so'
build/core/base_rules.mk:552: warning: ignoring old commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/lib/hw/gps.msm8974.so'
build/core/Makefile:47: warning: overriding commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/lib/libgps.utils.so'
build/core/base_rules.mk:552: warning: ignoring old commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/lib/libgps.utils.so'
build/core/Makefile:47: warning: overriding commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/lib/libloc_core.so'
build/core/base_rules.mk:552: warning: ignoring old commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/lib/libloc_core.so'
build/core/Makefile:47: warning: overriding commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/lib/libloc_eng.so'
build/core/base_rules.mk:552: warning: ignoring old commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/lib/libloc_eng.so'
PRODUCT_COPY_FILES vendor/eos/prebuilt/common/vendor/lib/drm/libdrmwvmplugin.so:system/vendor/lib/drm/libdrmwvmplugin.so ignored.
build/core/Makefile:47: warning: overriding commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/vendor/lib/mediadrm/libdrmclearkeyplugin.so'
build/core/base_rules.mk:552: warning: ignoring old commands for target `/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/system/vendor/lib/mediadrm/libdrmclearkeyplugin.so'
PRODUCT_COPY_FILES vendor/eos/prebuilt/common/vendor/lib/mediadrm/libwvdrmengine.so:system/vendor/lib/mediadrm/libwvdrmengine.so ignored.
No private recovery resources for TARGET_DEVICE hammerhead
host C: acp <= build/tools/acp/acp.c
host StaticLib: libmincrypt_32 (/home/thomas/Bureau/Euphoria-OS/out/host/linux-x86/obj32/STATIC_LIBRARIES/libmincrypt_intermediates/libmincrypt.a)
make -C kernel/lge/hammerhead O=/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/obj/KERNEL_OBJ ARCH=arm CROSS_COMPILE=" /home/thomas/Bureau/Euphoria-OS/prebuilts/gcc/linux-x86/arm/arm-cortex_a15-linux-gnueabihf-linaro_4.9.3-2015.03/bin/arm-eabi-" headers_install
host StaticLib: libhost_32 (/home/thomas/Bureau/Euphoria-OS/out/host/linux-x86/obj32/STATIC_LIBRARIES/libhost_intermediates/libhost.a)
make[1]: Entering directory `/home/thomas/Bureau/Euphoria-OS/kernel/lge/hammerhead'
host Executable: mkbootfs (/home/thomas/Bureau/Euphoria-OS/out/host/linux-x86/obj32/EXECUTABLES/mkbootfs_intermediates/mkbootfs)
host StaticLib: libsepol_32 (/home/thomas/Bureau/Euphoria-OS/out/host/linux-x86/obj32/STATIC_LIBRARIES/libsepol_intermediates/libsepol.a)
host StaticLib: libpcre_32 (/home/thomas/Bureau/Euphoria-OS/out/host/linux-x86/obj32/STATIC_LIBRARIES/libpcre_intermediates/libpcre.a)
/bin/bash: prebuilts/gcc/linux-x86/arm/arm-linux-androideabi-linaro_4.9.3-2015.03/bin/arm-linux-androideabi-gcc: No such file or directory
make: *** [/home/thomas/Bureau/Euphoria-OS/out/target/product/hammerhead/obj/lib/crtbegin_static1.o] Error 127
make: *** Waiting for unfinished jobs....
CHK include/linux/version.h
make[1]: Leaving directory `/home/thomas/Bureau/Euphoria-OS/kernel/lge/hammerhead'

#### make failed to build some targets (08:04 (mm:ss)) ####

real	8m4.067s
user	2m41.268s
sys	0m32.045s
thomas@thomas-Building:~/Bureau/Euphoria-OS$

I cant get rid of this error.

Does somebody knows what files do i need to edit to correctly build Euphoria ?

Thanks !