Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC

Commits:

• 2f3cc9ff
  by Simon Jakobi at 2026-06-08T07:55:49-04:00

  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 <noreply@anthropic.com>
  

1 changed file:

• testsuite/mk/test.mk

Changes:

 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