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| author | Ben Gamari <bgamari.foss@gmail.com> | 2018-02-03 11:37:01 -0500 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2018-02-03 11:37:14 -0500 |
| commit | 217e4170bdce3df28a667803ce5e619553bfecdd (patch) | |
| tree | 1e548bae29aecc72ce257dc962025c1388a7a7b5 /rts/ghc.mk | |
| parent | fdf518c708dc5a34ae810c5d5f3a4db812d226f0 (diff) | |
| download | haskell-217e4170bdce3df28a667803ce5e619553bfecdd.tar.gz | |
ghc-prim: Emulate C11 atomics when not available
GCC's __sync primitives apparently "usually" imply a full barrier,
meaning they can be used to emulate the more precise C11 atomics albeit
with a loss of efficiency. This restores compatibility with GCC 4.4.
This partially reverts commit 59de290928e6903337f31c1f8107ac8a98ea145d.
Test Plan: Validate on Centos
Reviewers: hvr, simonmar, trommler
Subscribers: rwbarton, thomie, erikd, carter
GHC Trac Issues: #14244
Differential Revision: https://phabricator.haskell.org/D4364
Diffstat (limited to 'rts/ghc.mk')
| -rw-r--r-- | rts/ghc.mk | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/rts/ghc.mk b/rts/ghc.mk index 690a883588..761cc43b8f 100644 --- a/rts/ghc.mk +++ b/rts/ghc.mk @@ -311,7 +311,9 @@ WARNING_OPTS += -Wpointer-arith WARNING_OPTS += -Wmissing-noreturn WARNING_OPTS += -Wnested-externs WARNING_OPTS += -Wredundant-decls +ifeq "$(GccLT46)" "NO" WARNING_OPTS += -Wundef +endif # These ones are hard to avoid: #WARNING_OPTS += -Wconversion |