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| -rw-r--r-- | llvm_mode/README.lto.md | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/llvm_mode/README.lto.md b/llvm_mode/README.lto.md index 88b1517d..0415076a 100644 --- a/llvm_mode/README.lto.md +++ b/llvm_mode/README.lto.md @@ -50,7 +50,8 @@ and many dead ends until we got to this: The result: * 10-25% speed gain compared to llvm_mode * guaranteed non-colliding edge coverage :-) - * The compile time especially for libraries can be longer + * The compile time especially for binaries to an instrumented library can be + much longer Example build output from a libtiff build: ``` @@ -61,8 +62,30 @@ AUTODICTIONARY: 11 strings found [+] Instrumented 12071 locations with no collisions (on average 1046 collisions would be in afl-gcc/afl-clang-fast) (non-hardened mode). ``` -## Building llvm 11 +## Getting llvm 11 +### Installing llvm 11 +Installing the llvm snapshot builds is easy and mostly painless: + +In the follow line change `NAME` for your Debian or Ubuntu release name +(e.g. buster, focal, eon, etc.): +``` +echo deb http://apt.llvm.org/NAME/ llvm-toolchain-NAME NAME >> /etc/apt/sources.list +``` +then add the pgp key of llvm and install the packages: +``` +wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | apt-key add - +apt-get update && apt-get upgrade -y +apt-get install -y clang-11 clang-tools-11 libc++1-11 libc++-11-dev \ + libc++abi1-11 libc++abi-11-dev libclang1-11 libclang-11-dev \ + libclang-common-11-dev libclang-cpp11 libclang-cpp11-dev liblld-11 \ + liblld-11-dev liblldb-11 liblldb-11-dev libllvm11 libomp-11-dev \ + libomp5-11 lld-11 lldb-11 llvm-11 llvm-11-dev llvm-11-runtime llvm-11-tools +``` + +### Building llvm 11 + +Building llvm from github takes quite some long time and is not painless: ``` $ sudo apt install binutils-dev # this is *essential*! $ git clone https://github.com/llvm/llvm-project |