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Diffstat (limited to 'Documentation/building/linux-instructions.md')
| -rw-r--r-- | Documentation/building/linux-instructions.md | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/Documentation/building/linux-instructions.md b/Documentation/building/linux-instructions.md index b14ab288ce..bacbe6d2f0 100644 --- a/Documentation/building/linux-instructions.md +++ b/Documentation/building/linux-instructions.md @@ -18,8 +18,8 @@ Toolchain Setup Install the following packages for the toolchain: - cmake -- llvm-3.5 -- clang-3.5 +- llvm-3.5 (llvm-3.9 for ARM cross build) +- clang-3.5 (clang-3.9 for ARM cross build) - lldb-3.6 - lldb-3.6-dev - libunwind8 @@ -39,6 +39,14 @@ ellismg@linux:~$ wget -O - http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt- ellismg@linux:~$ sudo apt-get update ``` +If you are going to cross build for ARM, you need llvm-3.9 and clang-3.9 and please add below package source instead for Ubuntu 14.04. +``` +hqueue@linux:~$ echo "deb http://apt.llvm.org/trusty/ llvm-toolchain-trusty-3.9 main" | sudo tee /etc/apt/sources.list.d/llvm.list +hqueue@linux:~$ wget -O - http://llvm.org/apt/llvm-snapshot.gpg.key | sudo apt-key add - +hqueue@linux:~$ sudo apt-get update +``` +For other version of Debian/Ubuntu, please visit http://apt.llvm.org/. + Then install the packages you need: ``` @@ -120,6 +128,8 @@ index 1ed3dbf..c643032 100644 How to enable -O3 optimization level for ARM/Linux ================================================== +If you are using clang-3.9, -O3 optimization is enabled as default and you can skip this section. +If you are using older version of clang, please follow instructions in this section to enable -O3 optimization. Currently, we can build coreclr with -O1 flag of clang in release build mode for Linux/ARM without any bugfix of llvm-3.6. This instruction is to enable -O3 optimization level of clang on Linux/ARM by fixing the bug of llvm. First, download latest version from the clang-3.6/llvm-3.6 upstream: |