Simon Jakobi pushed to branch wip/sjakobi/testsuite-bignum-detection at Glasgow Haskell Compiler / GHC Commits: 90d7915f by Simon Jakobi at 2026-06-06T17:48:20+02:00 testsuite: detect fast bignum via ghc-internal, not removed ghc-bignum The ghc-bignum package was merged into ghc-internal, so the BIGNUM_GMP probe in test.mk ran `ghc-pkg field ghc-bignum exposed-modules`, which fails with "cannot find package ghc-bignum". That error went to stderr and leaked into the captured stderr of every makefile_test, causing spurious [bad stderr] failures across the suite. The probe also silently returned empty, so config.have_fast_bignum was wrongly False even on GMP builds. Probe ghc-internal's extra-libraries for the gmp library instead: the GMP backend module is an other-module (not exposed), but GMP_LIBS adds gmp to extra-libraries only on a GMP build, so this distinguishes the backends. Redirect stderr to keep any future missing-package error off the harness's stderr. This also removes a stale comment as per suggestion from hsyl20. Co-Authored-By: Claude Opus 4.7 - - - - - 1 changed file: - testsuite/mk/test.mk Changes: ===================================== testsuite/mk/test.mk ===================================== @@ -109,9 +109,11 @@ endif HAVE_GDB := $(shell if gdb --version > /dev/null 2> /dev/null; then echo YES; else echo NO; fi) HAVE_READELF := $(shell if readelf --version > /dev/null 2> /dev/null; then echo YES; else echo NO; fi) -# we need a better way to find which backend is selected and if --check flag is -# used -BIGNUM_GMP := $(shell "$(GHC_PKG)" field ghc-bignum exposed-modules | grep GMP) +# Detect whether the fast (GMP) bignum backend is in use. The GMP backend module +# in ghc-internal is hidden, so we look instead for the gmp library it links +# against: GMP_LIBS adds gmp to ghc-internal's extra-libraries only on a GMP +# build. +BIGNUM_GMP := $(shell "$(GHC_PKG)" field ghc-internal extra-libraries 2>/dev/null | grep gmp) ifeq "$(filter thr, $(GhcRTSWays))" "thr" RUNTEST_OPTS += -e config.ghc_with_threaded_rts=True View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/90d7915fce76509c913dbe05fc9add2a... -- View it on GitLab: https://gitlab.haskell.org/ghc/ghc/-/commit/90d7915fce76509c913dbe05fc9add2a... You're receiving this email because of your account on gitlab.haskell.org.