testsuite: allow accepting of fine grained results [skip ci]

Summary:
Sometimes we need to be able to mass accept changes that are platform
specific and that can't be normalized away using our string formatters.

e.g. differences in I/O manager errors or behaviors. This allows one
to do so easier than before and less error prone.

I have updated the docs and made it clear this should only be used
when a normalizer won't work:

https://ghc.haskell.org/trac/ghc/wiki/Building/RunningTests/Updating

Test Plan: Manually tested while working on new I/O manager

Reviewers: bgamari

Subscribers: thomie, carter

Differential Revision: https://phabricator.haskell.org/D4549

1 files changed, 12 insertions, 0 deletions

diff --git a/testsuite/mk/test.mk b/testsuite/mk/test.mk
index a21c4bb16b..1eb8d49c4b 100644
--- a/testsuite/mk/test.mk
+++ b/testsuite/mk/test.mk
@@ -14,6 +14,9 @@
 #  CONFIG    -- use a different configuration file
 #  COMPILER  -- select a configuration file from config/
 #  THREADS   -- run n tests at once
+#  PLATFORM  -- if accepting a result, accept it for the current platform.
+#  OS        -- if accepting a result, accept it for all wordsizes of the
+#               current os.
 #
 # -----------------------------------------------------------------------------
 
@@ -280,6 +283,15 @@ endif
 
 ifeq "$(accept)" "YES"
 setaccept = -e config.accept=1
+
+ifeq "$(PLATFORM)" "YES"
+setaccept += -e config.accept_platform=1
+endif
+
+ifeq "$(OS)" "YES"
+setaccept += -e config.accept_os=1
+endif
+
 else
 setaccept =
 endif