This helps in overcoming a problem when using scons with ccache enabled.
When commands get longer, then it resorts to using response files to do
the operations e.g. @/tmp/tmp96j6icra.lnk when this response file is
inboked by compiler it works ok, however, this does not when ccache is
used to invoke the complilation. We see errors e.g.

ccache @/tmp/tmppsyij_0v.lnk
ccache: error: execute_noreturn of @/tmp/tmppsyij_0v.lnk failed: No such file or directory

Using MAXLINELENGTH setting ensures that we can use ARG_MAX to extend
the length of commandline and hence avoid using response files. This
issue is also reported in mongodb [1]

[1] https://jira.mongodb.org/browse/SERVER-38389

Signed-off-by: Khem Raj <raj.khem@...>
---
 meta/classes-recipe/scons.bbclass | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/meta/classes-recipe/scons.bbclass b/meta/classes-recipe/scons.bbclass
index 5f0d4a910b..d510c12b9b 100644
--- a/meta/classes-recipe/scons.bbclass
+++ b/meta/classes-recipe/scons.bbclass
@@ -9,11 +9,12 @@ inherit python3native
 DEPENDS += "python3-scons-native"

 EXTRA_OESCONS ?= ""
-
+# This value below is derived from $(getconf ARG_MAX)
+SCONS_MAXLINELENGTH ?= "2097152"
 do_configure() {
        if [ -n "${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=${prefix} prefix=${prefix} ${EXTRA_OESCONS}
+                       ${STAGING_BINDIR_NATIVE}/scons --directory=${S} --clean PREFIX=${prefix} MAXLINELENGTH=${SCONS_MAXLINELENGTH} prefix=${prefix} ${EXTRA_OESCONS}
                fi

                mkdir -p `dirname ${CONFIGURESTAMPFILE}`
@@ -22,13 +23,17 @@ do_configure() {
 }

 scons_do_compile() {
-       ${STAGING_BINDIR_NATIVE}/scons --directory=${S} ${PARALLEL_MAKE} PREFIX=${prefix} prefix=${prefix} ${EXTRA_OESCONS} || \
+       ${STAGING_BINDIR_NATIVE}/scons --directory=${S} ${PARALLEL_MAKE} PREFIX=${prefix} prefix=${prefix} MAXLINELENGTH=${SCONS_MAXLINELENGTH} ${EXTRA_OESCONS} || \
        die "scons build execution failed."
 }

 scons_do_install() {
-       ${STAGING_BINDIR_NATIVE}/scons --directory=${S} install_root=${D}${prefix} PREFIX=${prefix} prefix=${prefix} ${EXTRA_OESCONS} install || \
+       ${STAGING_BINDIR_NATIVE}/scons --directory=${S} install_root=${D}${prefix} PREFIX=${prefix} prefix=${prefix} MAXLINELENGTH=${SCONS_MAXLINELENGTH} ${EXTRA_OESCONS} install || \
        die "scons install execution failed."
 }

+do_configure[vardepsexclude] = "SCONS_MAXLINELENGTH"
+do_compile[vardepsexclude] = "SCONS_MAXLINELENGTH"
+do_install[vardepsexclude] = "SCONS_MAXLINELENGTH"
+
 EXPORT_FUNCTIONS do_compile do_install
--
2.39.1