This is an archive of the discontinued LLVM Phabricator instance.

	# Flang			# Flang

	Flang is a ground-up implementation of a Fortran front end written in modern			Flang is a ground-up implementation of a Fortran front end written in modern
	C++. It started off as the f18 project (https://github.com/flang-compiler/f18)			C++. It started off as the f18 project (https://github.com/flang-compiler/f18)
	with an aim to replace the previous flang project			with an aim to replace the previous flang project
	(https://github.com/flang-compiler/flang) and address its various deficiencies.			(https://github.com/flang-compiler/flang) and address its various deficiencies.
	F18 was subsequently accepted into the LLVM project and rechristened as Flang.			F18 was subsequently accepted into the LLVM project and rechristened as Flang.

				Please note that flang is not ready yet for production usage.

	## Getting Started			## Getting Started

	Read more about flang in the [docs directory](docs).			Read more about flang in the [docs directory](docs).
	Start with the [compiler overview](docs/Overview.md).			Start with the [compiler overview](docs/Overview.md).

	To better understand Fortran as a language			To better understand Fortran as a language
	and the specific grammar accepted by flang,			and the specific grammar accepted by flang,
	read [Fortran For C Programmers](docs/FortranForCProgrammers.md)			read [Fortran For C Programmers](docs/FortranForCProgrammers.md)
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	```bash			```bash
	ninja check-flang			ninja check-flang
	```			```

	## Supported C++ compilers			## Supported C++ compilers

	Flang is written in C++17.			Flang is written in C++17.

	The code has been compiled and tested with			The code has been compiled and tested with GCC versions from 7.2.0 to 9.3.0.
	GCC versions from 7.2.0 to 9.3.0.

	The code has been compiled and tested with			The code has been compiled and tested with clang version 7.0, 8.0, 9.0 and 10.0
	clang version 7.0, 8.0, 9.0 and 10.0
	using either GNU's libstdc++ or LLVM's libc++.			using either GNU's libstdc++ or LLVM's libc++.

	The code has been compiled on			The code has been compiled on AArch64, x86_64 and ppc64le servers with CentOS7,
	AArch64, x86\_64 and ppc64le servers			Ubuntu18.04, Rhel, MacOs, Mojave, XCode and Apple Clang version 10.0.1.
	with CentOS7, Ubuntu18.04, Rhel, MacOs, Mojave, XCode and
	Apple Clang version 10.0.1.			Note that flang is not supported on 32 bit CPUs.
				PeteSteinfeldUnsubmitted Not Done Reply Inline Actions I would say "supported on 32 bit CPUs". PeteSteinfeld: I would say "supported on 32 bit CPUs".

	### Building flang with GCC			### Building flang with GCC

	By default,			By default,
	cmake will search for g++ on your PATH.			cmake will search for g++ on your PATH.
	The g++ version must be one of the supported versions			The g++ version must be one of the supported versions
	in order to build flang.			in order to build flang.

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