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Changed Cygwin to use -O2 instead of -O3 with GCC 4.9 due to crash

pull/35/head
Jeffrey Walton 2015-07-31 10:22:15 -04:00
parent 5f2c32af37
commit b1085b7384
2 changed files with 19 additions and 2 deletions
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15
GNUmakefile
View File

@ -50,9 +50,14 @@ endif
CLANG_COMPILER = $(shell $(CXX) --version 2>&1 | $(EGREP) -i -c "clang")
INTEL_COMPILER = $(shell $(CXX) --version 2>&1 | $(EGREP) -i -c "\(ICC\)")
SUN_COMPILER = $(shell $(CXX) -V 2>&1 | $(EGREP) -i -c "CC: Sun")
GCC_COMPILER = $(shell $(CXX) -V 2>&1 | $(EGREP) -i -c "^gcc version")
ifneq ($(GCC_COMPILER),0)
IS_GCC_41 = $(shell $(CXX) -v 2>&1 | $(EGREP) -i -c "^gcc version 4\.1\.")
IS_GCC_42 = $(shell $(CXX) -v 2>&1 | $(EGREP) -i -c "^gcc version 4\.2\.")
IS_GCC_45 = $(shell $(CXX) -v 2>&1 | $(EGREP) -i -c "^gcc version 4\.5\.")
IS_GCC_49 = $(shell $(CXX) -v 2>&1 | $(EGREP) -i -c "^gcc version 4\.9\.")
endif
# Also see LLVM Bug 24200 (https://llvm.org/bugs/show_bug.cgi?id=24200)
# CLANG_ASSEMBLER ?= $(shell $(CXX) -xc -c /dev/null -Wa,-v -o/dev/null 2>&1 | $(EGREP) -i -c "^clang")
@ -198,13 +203,19 @@ CXXFLAGS := $(subst -fPIC,,$(CXXFLAGS))
endif # -fPIC
# -O3 fails to link with GCC 4.5.3
IS_GCC45 = $(shell $(CXX) -v 2>&1 | $(EGREP) -i -c "^gcc version 4\.5\.[0-9]")
ifneq ($(IS_GCC45),0)
ifneq ($(IS_GCC_45),0)
ifeq ($(findstring -O3,$(CXXFLAGS)),-O3)
CXXFLAGS := $(subst -O3,-O2,$(CXXFLAGS))
endif # -O3
endif # GCC 4.5
# -O3 crash in MQV validation with GCC 4.9.3
ifneq ($(IS_GCC_49),0)
ifeq ($(findstring -O3,$(CXXFLAGS)),-O3)
CXXFLAGS := $(subst -O3,-O2,$(CXXFLAGS))
endif # -O3
endif # GCC 4.9
endif # Cygwin work arounds
#########################

6
smartptr.h
View File

@ -79,6 +79,12 @@ public:
T *old_p = m_p;
m_p = 0;
return old_p;
#ifdef __GNUC__
// From Andrew Haley (GCC Dev), to tame the optimizer so the assignment is always performed.
// See "Disable optimizations in one function" on the GCC mailing list.
asm volatile ("" : : : "memory");
#endif
}
void reset(T *p = 0);