From 826684fc6ddf95290844459b2bfcb121087d0ae7 Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx@kernel.org>
Date: Sat, 10 Feb 2024 17:44:22 +0100
Subject: GNUmakefile: help-variables: Document variables

Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 GNUmakefile | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/GNUmakefile b/GNUmakefile
index f282827..29b9486 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -78,6 +78,10 @@ help:
 	$(info	dist-z-xz		Create a compressed tarball (.tar.xz))
 	$(info	)
 	$(info	help			Print this help)
+	$(info	help-variables		Print available variables, and default values)
+	$(info	)
+	$(info	nothing			Make nothing.  It's useful for debug purposes)
+	$(info	)
 
 
 .SECONDEXPANSION:
@@ -89,6 +93,58 @@ include $(MK_)
 $(MK):: ;
 
 
+.PHONY: help-variables
+help-variables:
+	$(info	DISTVERSION	$$(git describe))
+	$(info	DISTNAME	$(libname)-$$DISTVERSION)
+	$(info	)
+	$(info	HIDE_ERR	Define to empty string to debug some errors)
+	$(info	)
+	$(info	# Directory variables:)
+	$(info	)
+	$(info	builddir	.tmp)
+	$(info	DESTDIR)
+	$(info	prefix		/usr/local)
+	$(info	exec_prefix	$$prefix)
+	$(info	datarootdir	$$prefix/share)
+	$(info	includedir	$$prefix/include)
+	$(info	libdir		$$exec_prefix/lib)
+	$(info	mandir		$$datarootdir/man)
+	$(info	man{3,...}dir	$$mandir/man{3,...})
+	$(info	pcdir		$$libdir/pkgconfig)
+	$(info	)
+	$(info	# Command variables (and flags):)
+	$(info	)
+	$(info	BASH)
+	$(info	CP, CUT, ECHO, INSTALL, LN, RM, SORT, TAC, TOUCH)
+	$(info	INSTALL_DATA, INSTALL_DIR, INSTALL_PROGRAM)
+	$(info	FIND, XARGS)
+	$(info	GREP)
+	$(info	SED)
+	$(info	GIT)
+	$(info	)
+	$(info	PKGCONF, PKG_CONFIG	{EXTRA_,}PKGCONFFLAGS)
+	$(info	)
+	$(info	CPP			{EXTRA_,}CPPFLAGS)
+	$(info	CC			{EXTRA_,}CCFLAGS)
+	$(info	AS			{EXTRA_,}ASFLAGS)
+	$(info	LD			{EXTRA_,}LDFLAGS, {EXTRA_,}LDLIBS)
+	$(info	AR			{EXTRA_,}ARFLAGS)
+	$(info	)
+	$(info	CHECKPATCH		{EXTRA_,}CHECKPATCHFLAGS)
+	$(info	CLANG_TIDY		{EXTRA_,}CLANG_TIDYFLAGS)
+	$(info	CPPCHECK		{EXTRA_,}CPPCHECKFLAGS)
+	$(info	CPPLINT			{EXTRA_,}CPPLINTFLAGS)
+	$(info	IWYU			{EXTRA_,}IWYUFLAGS)
+	$(info	)
+	$(info	TAR			{EXTRA_,}TARFLAGS)
+	$(info	BZIP2			{EXTRA_,}BZIP2FLAGS)
+	$(info	GZIP			{EXTRA_,}GZIPFLAGS)
+	$(info	LZIP			{EXTRA_,}LZIPFLAGS)
+	$(info	XZ			{EXTRA_,}XZFLAGS)
+	$(info	)
+
+
 .PHONY: nothing
 nothing:;
 
-- 
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