One of our patches submitted to upstream gcc caused a regression in the
ada test suite. To debug it I did look at whether we could enable ada
in our builds. I'm writing down and sharing my notes for the archives
in case we ever want to pick this up again as it took me quite a while
to work this much out.
To do it you need gnat on the host which on my ubuntu system resulted
in something like:
HOSTTOOLS += "gnat gnatbind gnatmake x86_64-linux-gnu-gcc-11
x86_64-linux-gnu-gnatbind-11 x86_64-linux-gnu-gnatlink-11"
and I changed gcc's LANAGAGES to:
LANGUAGES ?= "c,c++${FORTRAN},ada"
Sadly this fails to build with errors like:
| s-valuns.ads:55:04: instantiation error at s-valueu.ads:579
| s-valuns.ads:55:04: expected type derived from "System.Val_Uns." from
instance at line 55
| s-valuns.ads:55:04: found type "Standard.String"
| s-valuns.ads:55:04: instantiation error at s-valueu.ads:581
| s-valuns.ads:55:04: expected type "Standard.String"
which is basically because the host's gnat version doesn't match the
target version we're building in gcc-cross.
Digging on why a standalone build eventually works out ok, it seems
that when building gcc stage 1, ada is built against the host system
libgnat. In later gcc stages, libgnat is built using the new compiler
and since there is now no mismatch, the build works.
(see gcc/ada/gcc-interface/Make-lang)
How we'd solve that in OE, I'm less sure. We'd probably need a gcc-ada-
native recipe which was an ada stage 1 compiler which we'd then
configure gcc-cross to use to build ada.
I sorted the upstream issue so I don't plan to pursue this any further
at this point, just document what I worked out.
Cheers,
Richard
-=-=-=-=-=-=-=-=-=-=-=-
Links: You receive all messages sent to this group.
View/Reply Online (#172746):
https://lists.openembedded.org/g/openembedded-core/message/172746
Mute This Topic: https://lists.openembedded.org/mt/94827318/21656
Group Owner: [email protected]
Unsubscribe: https://lists.openembedded.org/g/openembedded-core/unsub
[[email protected]]
-=-=-=-=-=-=-=-=-=-=-=-
