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Revert "Remove fno-tree-vrp compile flag."

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This reverts commit e8d6e3fe3b.
Also added a comment pointing to the recent discussion.
See http://www.freelists.org/post/haiku-development/hrev45320-Yet-another-nonobvious-effect-of-ftreevrp-optimization
This commit is contained in:
Fredrik Holmqvist
2013-03-25 22:29:15 +01:00
parent daebca78f8
commit a54db680ba
1 changed files with 5 additions and 2 deletions
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build/jam/BuildSetup
+5 -2
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@@ -131,8 +131,11 @@ if $(HAIKU_USE_GCC_PIPE) = 1 {
# results in some broken code. # results in some broken code.
# TODO: remove the -fno-strict-aliasing option when all code has been # TODO: remove the -fno-strict-aliasing option when all code has been
# analyzed/fixed with regard to aliasing. # analyzed/fixed with regard to aliasing.
# TODO: retest/remove the -fno-tree-vrp option as soon as we have updated our
# gcc4 compiler. See this discussion on some issues:
# http://www.freelists.org/post/haiku-development/hrev45320-Yet-another-nonobvious-effect-of-ftreevrp-optimization
if $(HAIKU_GCC_VERSION[1]) >= 3 { if $(HAIKU_GCC_VERSION[1]) >= 3 {
HAIKU_GCC_BASE_FLAGS += -fno-strict-aliasing ; HAIKU_GCC_BASE_FLAGS += -fno-strict-aliasing -fno-tree-vrp ;
} }
# disable array bounds warnings on gcc 4.6 or newer since they trigger # disable array bounds warnings on gcc 4.6 or newer since they trigger
@@ -145,7 +148,7 @@ if $(HAIKU_GCC_VERSION[1]) >= 4 {
} }
if $(HOST_GCC_VERSION[1]) >= 3 { if $(HOST_GCC_VERSION[1]) >= 3 {
HOST_GCC_BASE_FLAGS += -fno-strict-aliasing ; HOST_GCC_BASE_FLAGS += -fno-strict-aliasing -fno-tree-vrp ;
} }
# override gcc 2.95.3's header directory -- strictly necessary only when using # override gcc 2.95.3's header directory -- strictly necessary only when using