Mercurial > hg > openjdk > jdk6 > hotspot
changeset 4123:59828109820c
8151841: Build needs additional flags to compile with GCC 6
Summary: C++ standard needs to be explicitly set and some optimisations turned off to build on GCC 6
Reviewed-by: erikj, dholmes, kbarrett
| author | andrew |
|---|---|
| date | Fri, 08 Jul 2016 01:58:45 +0100 |
| parents | 7561dfbeeee5 |
| children | 1e5be96d5c48 |
| files | make/linux/makefiles/gcc.make |
| diffstat | 1 files changed, 7 insertions(+), 0 deletions(-) [+] |
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--- a/make/linux/makefiles/gcc.make Wed May 04 23:23:54 2016 +0100 +++ b/make/linux/makefiles/gcc.make Fri Jul 08 01:58:45 2016 +0100 @@ -73,6 +73,7 @@ ifeq ($(SHARK_BUILD), true) CFLAGS += $(LLVM_CFLAGS) endif +CFLAGS += -std=gnu++98 CFLAGS += $(VM_PICFLAG) CFLAGS += -fno-rtti CFLAGS += -fno-exceptions @@ -83,6 +84,12 @@ ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0" CFLAGS += -fvisibility=hidden endif +# GCC 6 has more aggressive dead-store elimination which causes the VM to crash +# It also optimises away null pointer checks which are still needed. +# We turn both of these optimisations off. +ifneq "$(shell expr \( $(CC_VER_MAJOR) \>= 6 \))" "0" +CFLAGS += -fno-delete-null-pointer-checks -fno-lifetime-dse +endif ARCHFLAG = $(ARCHFLAG/$(BUILDARCH)) ARCHFLAG/i486 = -m32 -march=i586