You need a checkout of clang with compiler-rt to generate the binary file here. These shell commands can be used to regenerate it. $ SRC=path/to/llvm $ CFE=$SRC/tools/clang $ TESTDIR=$SRC/test/tools/llvm-profdata $ CFE_TESTDIR=$CFE/test/Profile $ clang -o a.out -fprofile-instr-generate $CFE_TESTDIR/c-general.c $ LLVM_PROFILE_FILE=$TESTDIR/Inputs/compressed.profraw ./a.out RUN: not llvm-profdata show %p/Inputs/compressed.profraw -o %t 2>&1 | FileCheck %s REQUIRES: !zlib CHECK: error: {{.*}} Profile uses zlib compression but the profile reader was built without zlib support