asm_rules

#!/bin/bash
#
# 2020-02-15 J.Nider

realpath=$(readlink -f $0) # in case 'bake' was executed from a symbolic link
path=${realpath%/*} # full path of 'bake' script (minus the script name)

# include the linker rules automatically for convenience
source $path/ld_rules

#---------------------------
# compile .S file to .o file
#
# Depends on: ASM compiler name
# Optional: ASMFLAGS additional flags to pass to compiler
#
function rule_compile_asm()
{
	local target=$1
	local flags=$2
	local root=${target%.o}
	local deps

	# the first dependency is the source file, otherwise guess at the name
	_deps_of $target "deps"
	local srcfile=${deps[0]#:-$root.S}
	local suffix=${srcfile##*.}

	# make sure source file exists and is of the right type
	[[ "$suffix" == "S" ]] && [[ -f "$srcfile" ]] || return -1

	# make sure the compiler is set
	[[ $ASM ]] || {
		echo "${FUNCNAME[0]}: 'ASM' variable must be set to the name of the assembler"
		exit
	}

	# build Make dependency fragment file
	[[ $ASMDEPS ]] && $flags+=" -MF $target.d"

	echo "Assembling $srcfile to $target"

	local cmd="$ASM $flags -c $srcfile -o $target"
	[[ $__verbose ]] && echo $cmd
	$cmd
}