- I am using Mac OS X Sierra, and I found that clang (LLVM version 8.1.0 (clang-802.0.38)) does not support OpenMP: when I run clang -fopenmp programname.c, I got the following error: clang: error: unsupported option '-fopenmp' It seems that clang does not support -fopenmp flag. I could not find any openmp library in homebrew.
- 1 day ago This was mirrored from the snapshot of earthserver.com available on archive.org-Setting up a modern C development environment on Linux with Clang and Emacs.
llvm-gcc
Mac OS/X universal tarball with llvm-gcc 4.0 and all other LLVM tools This is most useful if you want a no-fuss drop-in replacement for Apple GCC. To install this, sudo to root, then untar in /. Clang may already be installed on your Mac. To verify that it is, open a macOS Terminal window and enter the following command: clang -version. If Clang isn't installed, enter the following command to install the command line developer tools: xcode-select -install Create Hello World. Basic LLVM Installation for Mac OS X (Mavericks) 1. Prerequisites As the preferred development environment, Mac is the simplest to configure. The only prerequisites are: 1. Mac OS X 10.9 (Mavericks) or higher 2. Xcode 5 or higher 3. 5 GB free space (when built, LLVM will take about almost 4 GB) With Xcode 5 installed, several. Apple's development tools are all built on LLVM, and clang is part of Xcode (Apple's development tools). The easiest way to install them is to simply install the Xcode command line tools:. Open a Terminal window. Type code xcode-select -inst. C - tutorial - LLVM vs clang on OS X llvm vs gcc (2) LLVM originally stood for 'low-level virtual machine', though it now just stands for itself as it has grown to.
Mac Install Clang
The Mac OS X port team plans to use the LLVM-GCC compiler (as Apple's proprietary Java SE 6 does) until the JDK and HotSpot can be compiled completely with the LLVM Clang compiler.
-Os vs. -O3
The Mac OS X port uses the -Os (size) optimization level, instead of -O3 (also as Apple's proprietary Java SE 6 does). On Mac OS X, gcc, llvm-gcc, and clang all provide very good optimizations at -Os without reverting to excessive loop unrolling. Whole system testing has shown that cost of paging in larger binaries and instruction cache misses can outweigh the benefits of -O3.
Clang Download Mac
The Java team's last evaluation of compiling HotSpot with -O3 vs. -Os in late 2010 showed statistically equivalent performance on several long running JVM benchmarks.
-mstackrealign
Mac OS X requires all stack frames to be 16-byte aligned in both 32 and 64-bit. Assembly stub functions within HotSpot do not natively perform this alignment in i386, so we make the compiler ensure that alignment is done at the call point.
Clang Mac
This option works in GCC 4.0, but not in GCC 4.2. LLVM-GCC supports this option in Xcode 3.2.6 and Xcode 4.0.
Llvm Macos
SVN trunk builds of Clang support this, but no stable builds do. Download gnu gcc compiler for mac.