162306a36Sopenharmony_ci# SPDX-License-Identifier: GPL-2.0 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci# Shorthand 462306a36Sopenharmony_ciwarning = $(warning-if,y,$(1)) 562306a36Sopenharmony_ci 662306a36Sopenharmony_ci# You can not pass commas directly to a function since they are treated as 762306a36Sopenharmony_ci# delimiters. You can use the following trick to do so. 862306a36Sopenharmony_cicomma := , 962306a36Sopenharmony_ci$(warning,hello$(comma) world) 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ci# Like Make, single quotes, double quotes, spaces are treated verbatim. 1262306a36Sopenharmony_ci# The following prints the text as-is. 1362306a36Sopenharmony_ci$(warning, ' " '" ' ''' "'") 1462306a36Sopenharmony_ci 1562306a36Sopenharmony_ci# Unlike Make, '$' has special meaning only when it is followed by '('. 1662306a36Sopenharmony_ci# No need to escape '$' itself. 1762306a36Sopenharmony_ci$(warning,$) 1862306a36Sopenharmony_ci$(warning,$$) 1962306a36Sopenharmony_ci$ := 1 2062306a36Sopenharmony_ci$(warning,$($)) 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ci# You need a trick to escape '$' followed by '(' 2362306a36Sopenharmony_ci# The following should print "$(X)". It should not be expanded further. 2462306a36Sopenharmony_cidollar := $ 2562306a36Sopenharmony_ci$(warning,$(dollar)(X)) 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ci# You need a trick to treat unbalanced parentheses. 2862306a36Sopenharmony_ci# The following should print "(". 2962306a36Sopenharmony_cileft_paren := ( 3062306a36Sopenharmony_ci$(warning,$(left_paren)) 3162306a36Sopenharmony_ci 3262306a36Sopenharmony_ci# A simple expanded should not be expanded multiple times. 3362306a36Sopenharmony_ci# The following should print "$(X)". It should not be expanded further. 3462306a36Sopenharmony_ciY := $(dollar)(X) 3562306a36Sopenharmony_ci$(warning,$(Y)) 3662306a36Sopenharmony_ci 3762306a36Sopenharmony_ci# The following should print "$(X)" as well. 3862306a36Sopenharmony_ciY = $(dollar)(X) 3962306a36Sopenharmony_ci$(warning,$(Y)) 4062306a36Sopenharmony_ci 4162306a36Sopenharmony_ci# The following should print "$(". 4262306a36Sopenharmony_ci# It should not be emit "unterminated reference" error. 4362306a36Sopenharmony_ciunterminated := $(dollar)( 4462306a36Sopenharmony_ci$(warning,$(unterminated)) 45