Extracted from https://bugs.gentoo.org/947587#c7. Starting from an installed sys-devel/gcc[d] and trying to turn on the ada use flag leads to portage trying to pull in older gcc slots like in https://bugs.gentoo.org/950310: ----------- # cat /etc/portage/package.use sys-devel/gcc d sys-devel/gcc:14 ada # quse -IDvp gcc | grep -E 'ada|\bd\b|^sys-devel' sys-devel/gcc-14.2.1_p20241116 ada <no description found> d* <no description found> # emerge -pv gcc \=ada-bootstrap-14 These are the packages that would be merged, in order: Calculating dependencies... done! Dependency resolution took 4.09 s (backtrack: 3/20). [ebuild U ] app-portage/elt-patches-20250306::gentoo [20241121::gentoo] 0 KiB [ebuild N ] dev-lang/ada-bootstrap-14::gentoo 45,550 KiB [ebuild NS ] sys-devel/gcc-11.5.0:11::gentoo [14.2.1_p20241116:14::gentoo] USE="cet (cxx) d fortran hardened (multilib) nls openmp (pie) sanitize (ssp) zstd -ada (-custom-cflags) -debug -doc (-fixed-point) -go -graphite -jit (-libssp) -lto -objc -objc++ -objc-gc (-pch) -pgo -systemtap -test -valgrind -vanilla -vtv (-default-stack-clash-protection%*) (-default-znow%*) (-ieee-long-double%) (-modula2%) (-rust%) (-time64%)" 14 KiB [ebuild NS ] sys-devel/gcc-12.4.1_p20241219:12::gentoo [14.2.1_p20241116:14::gentoo] USE="cet (cxx) d (default-stack-clash-protection) (default-znow) fortran hardened (multilib) nls openmp (pie) sanitize (ssp) zstd -ada (-custom-cflags) -debug -doc (-fixed-point) -go -graphite (-ieee-long-double) -jit (-libssp) -lto -objc -objc++ -objc-gc (-pch) -pgo -systemtap -test -valgrind -vanilla -vtv (-modula2%) (-rust%) (-time64%)" 78,062 KiB [ebuild NS ] sys-devel/gcc-13.3.1_p20241220:13::gentoo [14.2.1_p20241116:14::gentoo] USE="cet (cxx) d (default-stack-clash-protection) (default-znow) fortran hardened (multilib) nls openmp (pie) sanitize (ssp) zstd -ada (-custom-cflags) -debug -doc (-fixed-point) -go -graphite (-ieee-long-double) -jit (-libssp) -lto -modula2 -objc -objc++ -objc-gc (-pch) -pgo -systemtap -test -valgrind -vanilla -vtv (-rust%) (-time64%)" 0 KiB [ebuild U ] sys-devel/gcc-14.2.1_p20241221:14::gentoo [14.2.1_p20241116:14::gentoo] USE="ada* cet (cxx) d (default-stack-clash-protection) (default-znow) fortran hardened (multilib) nls openmp (pie) sanitize (ssp) zstd (-custom-cflags) -debug -doc (-fixed-point) -go -graphite (-ieee-long-double) -jit (-libssp) -lto -modula2 -objc -objc++ -objc-gc (-pch) -pgo -rust -systemtap -test (-time64) -valgrind -vanilla -vtv" 0 KiB Total: 6 packages (2 upgrades, 1 new, 3 in new slots), Size of downloads: 123,625 KiB ----------- Satisfying <sys-devel/gcc-14[d] leads to the correct result: ----------- # cat /etc/portage/package.use sys-devel/gcc d sys-devel/gcc:14 ada # quse -IDvp gcc | grep -E 'ada|\bd\b|^sys-devel' sys-devel/gcc-14.2.1_p20241116 ada <no description found> d* <no description found> sys-devel/gcc-13.3.1_p20241220 ada <no description found> d* <no description found> # emerge -pv gcc \=ada-bootstrap-14 These are the packages that would be merged, in order: Calculating dependencies... done! Dependency resolution took 2.68 s (backtrack: 1/20). [ebuild U ] app-portage/elt-patches-20250306::gentoo [20241121::gentoo] 0 KiB [ebuild N ] dev-lang/ada-bootstrap-14::gentoo 45,550 KiB [ebuild U ] sys-devel/gcc-14.2.1_p20241221:14::gentoo [14.2.1_p20241116:14::gentoo] USE="ada* cet (cxx) d (default-stack-clash-protection) (default-znow) fortran hardened (multilib) nls openmp (pie) sanitize (ssp) zstd (-custom-cflags) -debug -doc (-fixed-point) -go -graphite (-ieee-long-double) -jit (-libssp) -lto -modula2 -objc -objc++ -objc-gc (-pch) -pgo -rust -systemtap -test (-time64) -valgrind -vanilla -vtv" 0 KiB Total: 3 packages (2 upgrades, 1 new), Size of downloads: 45,550 KiB ----------- \=ada-bootstrap-14 has been used to help portage figure out the more optimal build path (https://bugs.gentoo.org/947587). Also, adding the ada use flag to all versions of gcc leads to a broken depgraph: ----------- # cat /etc/portage/package.use sys-devel/gcc d sys-devel/gcc ada # quse -IDvp gcc | grep -E 'ada|\bd\b|^sys-devel' sys-devel/gcc-14.2.1_p20241116 ada <no description found> d* <no description found> sys-devel/gcc-13.3.1_p20241220 ada <no description found> d* <no description found> # emerge -pv gcc \=ada-bootstrap-14 These are the packages that would be merged, in order: Calculating dependencies... done! Dependency resolution took 4.79 s (backtrack: 4/20). [ebuild R ] sys-devel/gcc-13.3.1_p20241220:13::gentoo USE="ada* cet (cxx) d (default-stack-clash-protection) (default-znow) fortran hardened (multilib) nls openmp (pie) sanitize (ssp) zstd (-custom-cflags) -debug -doc (-fixed-point) -go -graphite (-ieee-long-double) -jit (-libssp) -lto -modula2 -objc -objc++ -objc-gc (-pch) -pgo -systemtap -test -valgrind -vanilla -vtv" 0 KiB [ebuild NS ] sys-devel/gcc-12.4.1_p20241219:12::gentoo [13.3.1_p20241220:13::gentoo, 14.2.1_p20241116:14::gentoo] USE="ada* cet (cxx) d (default-stack-clash-protection) (default-znow) fortran hardened (multilib) nls openmp (pie) sanitize (ssp) zstd (-custom-cflags) -debug -doc (-fixed-point) -go -graphite (-ieee-long-double) -jit (-libssp) -lto -objc -objc++ -objc-gc (-pch) -pgo -systemtap -test -valgrind -vanilla -vtv (-modula2%) (-rust%) (-time64%)" 78,062 KiB [ebuild NS ] sys-devel/gcc-11.5.0:11::gentoo [13.3.1_p20241220:13::gentoo, 14.2.1_p20241116:14::gentoo] USE="ada* cet (cxx) d fortran hardened (multilib) nls openmp (pie) sanitize (ssp) zstd (-custom-cflags) -debug -doc (-fixed-point) -go -graphite -jit (-libssp) -lto -objc -objc++ -objc-gc (-pch) -pgo -systemtap -test -valgrind -vanilla -vtv (-default-stack-clash-protection%*) (-default-znow%*) (-ieee-long-double%) (-modula2%) (-rust%) (-time64%)" 14 KiB [ebuild U ] sys-devel/gcc-14.2.1_p20241221:14::gentoo [14.2.1_p20241116:14::gentoo] USE="ada* cet (cxx) d (default-stack-clash-protection) (default-znow) fortran hardened (multilib) nls openmp (pie) sanitize (ssp) zstd (-custom-cflags) -debug -doc (-fixed-point) -go -graphite (-ieee-long-double) -jit (-libssp) -lto -modula2 -objc -objc++ -objc-gc (-pch) -pgo -rust -systemtap -test (-time64) -valgrind -vanilla -vtv" 0 KiB Total: 4 packages (1 upgrade, 2 in new slots, 1 reinstall), Size of downloads: 78,075 KiB * Error: circular dependencies: (sys-devel/gcc-11.5.0:11/11::gentoo, ebuild scheduled for merge) depends on (sys-devel/gcc-11.5.0:11/11::gentoo, ebuild scheduled for merge) (buildtime) * Note that circular dependencies can often be avoided by temporarily * disabling USE flags that trigger optional dependencies. -----------
The bug has been referenced in the following commit(s): https://gitweb.gentoo.org/proj/portage.git/commit/?id=899fa83063acb0561e9ccde48627d5f135fc552b commit 899fa83063acb0561e9ccde48627d5f135fc552b Author: Alfred Wingate <parona@protonmail.com> AuthorDate: 2025-03-13 16:38:25 +0000 Commit: Sam James <sam@gentoo.org> CommitDate: 2025-03-13 17:06:29 +0000 tests: resolver: Add xfail test for ada/D bootstrap chain (bug #951296) Two tests for cases where the shortcut is first and last in the any-of-many dependency respectively. With current behavior portage can correctly handle it if its first but not if its last. Bug: https://bugs.gentoo.org/951296 Signed-off-by: Alfred Wingate <parona@protonmail.com> Closes: https://github.com/gentoo/portage/pull/1430 Signed-off-by: Sam James <sam@gentoo.org> lib/portage/tests/resolver/test_bootstrap_deps.py | 127 ++++++++++++++++++++++ 1 file changed, 127 insertions(+)
