[issue46100] Simplify readline / editline detection

[Erlend E. Aasland]

Erlend E. Aasland <erlend.aasland at innova.no> added the comment:

FWIW, the XCode SDKs for macOS 11 and 12 use the NetBSD editline library.


$ grep "NetBSD: readline" /Library/Developer/CommandLineTools/SDKs/MacOSX*.sdk/usr/include/readline/readline.h
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/readline/readline.h:/*	$NetBSD: readline.h,v 1.33 2012/05/15 17:30:04 christos Exp $	*/
/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/usr/include/readline/readline.h:/*	$NetBSD: readline.h,v 1.33 2012/05/15 17:30:04 christos Exp $	*/
/Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk/usr/include/readline/readline.h:/*	$NetBSD: readline.h,v 1.33 2012/05/15 17:30:04 christos Exp $	*/
/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk/usr/include/readline/readline.h:/*	$NetBSD: readline.h,v 1.33 2012/05/15 17:30:04 christos Exp $	*/
/Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/readline/readline.h:/*	$NetBSD: readline.h,v 1.33 2012/05/15 17:30:04 christos Exp $	*/
/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/readline/readline.h:/*	$NetBSD: readline.h,v 1.33 2012/05/15 17:30:04 christos Exp $	*/
$ grep RL_READLINE_VERSION /Library/Developer/CommandLineTools/SDKs/MacOSX*.sdk/usr/include/readline/readline.h
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/readline/readline.h:#define RL_READLINE_VERSION 	0x0402
/Library/Developer/CommandLineTools/SDKs/MacOSX11.1.sdk/usr/include/readline/readline.h:#define RL_READLINE_VERSION 	0x0402
/Library/Developer/CommandLineTools/SDKs/MacOSX11.3.sdk/usr/include/readline/readline.h:#define RL_READLINE_VERSION 	0x0402
/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk/usr/include/readline/readline.h:#define RL_READLINE_VERSION 	0x0402
/Library/Developer/CommandLineTools/SDKs/MacOSX12.0.sdk/usr/include/readline/readline.h:#define RL_READLINE_VERSION 	0x0402
/Library/Developer/CommandLineTools/SDKs/MacOSX12.sdk/usr/include/readline/readline.h:#define RL_READLINE_VERSION 	0x0402


This is what Homebrew provides:

$ PKG_CONFIG_PATH=$(brew --prefix readline)/lib/pkgconfig pkg-config readline --cflags --libs
-I/usr/local/Cellar/readline/8.1.1/include -L/usr/local/Cellar/readline/8.1.1/lib -lreadline

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<https://bugs.python.org/issue46100>
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