Hello Robert, all,

On Tue, Mar 9, 2021 at 3:39 PM Robert P. J. Day <rpjday@...> wrote:

is there an actual practical usage of, say:

VAR_x86_append = "huh"

$grep -re '[A-Z_]\+_[a-z0-9]\+_append' poky/meta*
poky/meta/recipes-support/gmp/gmp_6.2.0.bb:EXTRA_OECONF_mipsarchr6_append
= " --disable-assembly"
poky/meta/recipes-core/images/build-appliance-image_15.0.0.bb:IMAGE_CMD_ext4_append
() {
poky/meta/recipes-devtools/python/python3_3.8.2.bb:RDEPENDS_libpython3_append_libc-glibc
= " libgcc"
poky/meta/recipes-devtools/gdb/gdb-common.inc:RRECOMMENDS_gdb_append_linux
= " glibc-thread-db "
poky/meta/recipes-devtools/gdb/gdb-common.inc:RRECOMMENDS_gdb_append_linux-gnueabi
= " glibc-thread-db "
poky/meta/recipes-devtools/gdb/gdb-common.inc:RRECOMMENDS_gdbserver_append_linux
= " glibc-thread-db "
poky/meta/recipes-devtools/gdb/gdb-common.inc:RRECOMMENDS_gdbserver_append_linux-gnueabi
= " glibc-thread-db "

which is appending an override variable conditionally with another
override condition. (If I put this correctly.) Is this a valid use
case where += would not work?

Other appearances without an override condition:
$ grep -re '[A-Z_]\+_[a-z0-9]\+_append' meta-*
meta-openembedded/<..>/libnma_1.8.28.bb:EXTRA_OEMESON_mipsarchn32_append
= " -Dvapi=false"
meta-openembedded/<..>/libnma_1.8.28.bb:EXTRA_OEMESON_riscv32_append =
" -Dvapi=false"

Could these have been replaced with the following?

EXTRA_OEMESON_mipsarchn32 += "-Dvapi=false"
EXTRA_OEMESON_riscv32 += "-Dvapi=false"

Seems like a good test case indeed.

Regards,

Leon.