From b745e82837e7c285fefdecfd580a343ecbd3baff Mon Sep 17 00:00:00 2001 From: Tom Rini Date: Wed, 16 Mar 2016 19:55:55 -0400 Subject: arm: clang: Update support slightly - Move most of the flags required into LLVM_RELFLAGS to test at build time instead of requiring them to be passed in. - Update doc/README.clang to reflect this - Switch to rpi_2 as the example as it's closer to working out of the box than rpi is. Cc: Jeroen Hofstee Signed-off-by: Tom Rini --- doc/README.clang | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) (limited to 'doc') diff --git a/doc/README.clang b/doc/README.clang index d41f85b3ed..e0491b2d7e 100644 --- a/doc/README.clang +++ b/doc/README.clang @@ -26,10 +26,10 @@ Debian (based) Binary packages can be installed as usual, e.g.: sudo apt-get install clang -To compile U-Boot with clang on linux without IAS use e.g.: -export TRIPLET=arm-linux-gnueabi && export CROSS_COMPILE="$TRIPLET-" -make HOSTCC=clang CC="clang -target $TRIPLET -mllvm -arm-use-movt=0 -no-integrated-as" rpi_defconfig -make HOSTCC=clang CC="clang -target $TRIPLET -mllvm -arm-use-movt=0 -no-integrated-as" all V=1 -j8 +Note that we still use binutils for some tools so we must continue to set +CROSS_COMPILE. To compile U-Boot with clang on linux without IAS use e.g.: +make HOSTCC=clang rpi_2_defconfig +make HOSTCC=clang CROSS_COMPILE=arm-linux-gnueabi- CC=clang -j8 It can also be used to compile sandbox: make HOSTCC=clang sandbox_defconfig @@ -46,8 +46,8 @@ ln -s /usr/local/bin/arm-gnueabi-freebsd-as /usr/bin/arm-freebsd-eabi-as # The following commands compile U-Boot using the clang xdev toolchain. # NOTE: CROSS_COMPILE and target differ on purpose! export CROSS_COMPILE=arm-gnueabi-freebsd- -gmake CC="clang -target arm-freebsd-eabi --sysroot /usr/arm-freebsd -no-integrated-as -mllvm -arm-use-movt=0" rpi_defconfig -gmake CC="clang -target arm-freebsd-eabi --sysroot /usr/arm-freebsd -no-integrated-as -mllvm -arm-use-movt=0" -j8 +gmake rpi_2_defconfig +gmake CC="clang -target arm-freebsd-eabi --sysroot /usr/arm-freebsd" -j8 Given that U-Boot will default to gcc, above commands can be simplified with a simple wrapper script, listed below. @@ -56,5 +56,4 @@ simplified with a simple wrapper script, listed below. --- #!/bin/sh -exec clang -target arm-freebsd-eabi --sysroot /usr/arm-freebsd -no-integrated-as -mllvm -arm-use-movt=0 "$@" - +exec clang -target arm-freebsd-eabi --sysroot /usr/arm-freebsd "$@" -- cgit v1.2.1