scons.bbclass: Make MAXLINELENGTH overridable

older scons do not support MAXLINELENGTH and some packages still may be
using older scons, these recipes can clear SCONS_MAXLINELENGTH in them
and get going. Set

SCONS_MAXLINELENGTH = ""

in such recipes.

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes-recipe/scons.bbclass

@@ -10,11 +10,12 @@ DEPENDS += "python3-scons-native"
 
 EXTRA_OESCONS ?= ""
 # This value below is derived from $(getconf ARG_MAX)
-SCONS_MAXLINELENGTH ?= "2097152"
+SCONS_MAXLINELENGTH ?= "MAXLINELENGTH=2097152"
+EXTRA_OESCONS:append = " ${SCONS_MAXLINELENGTH}"
 do_configure() {
 	if [ -n "${CONFIGURESTAMPFILE}" -a "${S}" = "${B}" ]; then
 		if [ -e "${CONFIGURESTAMPFILE}" -a "`cat ${CONFIGURESTAMPFILE}`" != "${BB_TASKHASH}" -a "${CLEANBROKEN}" != "1" ]; then
-			${STAGING_BINDIR_NATIVE}/scons --directory=${S} --clean PREFIX=${prefix} MAXLINELENGTH=${SCONS_MAXLINELENGTH} prefix=${prefix} ${EXTRA_OESCONS}
+			${STAGING_BINDIR_NATIVE}/scons --directory=${S} --clean PREFIX=${prefix} prefix=${prefix} ${EXTRA_OESCONS}
 		fi
 
 		mkdir -p `dirname ${CONFIGURESTAMPFILE}`
@@ -23,12 +24,12 @@ do_configure() {
 }
 
 scons_do_compile() {
-	${STAGING_BINDIR_NATIVE}/scons --directory=${S} ${PARALLEL_MAKE} PREFIX=${prefix} prefix=${prefix} MAXLINELENGTH=${SCONS_MAXLINELENGTH} ${EXTRA_OESCONS} || \
+	${STAGING_BINDIR_NATIVE}/scons --directory=${S} ${PARALLEL_MAKE} PREFIX=${prefix} prefix=${prefix} ${EXTRA_OESCONS} || \
 	die "scons build execution failed."
 }
 
 scons_do_install() {
-	${STAGING_BINDIR_NATIVE}/scons --directory=${S} install_root=${D}${prefix} PREFIX=${prefix} prefix=${prefix} MAXLINELENGTH=${SCONS_MAXLINELENGTH} ${EXTRA_OESCONS} install || \
+	${STAGING_BINDIR_NATIVE}/scons --directory=${S} install_root=${D}${prefix} PREFIX=${prefix} prefix=${prefix} ${EXTRA_OESCONS} install || \
 	die "scons install execution failed."
 }