JDK9: _FORTIFY_SOURCE errors during compilation

[Andrew Haley]

In a fastdebug build of JDK9:

Compiling ../generated/jvmtifiles/bytecodeInterpreterWithChecks.cpp
rm -f bytecodeInterpreterWithChecks.o
/home/aph/gcc/trunk/install/bin//g++ -DLINUX -D_GNU_SOURCE -DAMD64 -DASSERT -I. -I/scratch/jdk9/hotspot/src/share/vm/prims -I/scratch/jdk9/hotspot/src/share/vm -I/scratch/jdk9/hotspot/src/share/vm/precompiled -I/scratch/jdk9/hotspot/src/cpu/x86/vm -I/scratch/jdk9/hotspot/src/os_cpu/linux_x86/vm -I/scratch/jdk9/hotspot/src/os/linux/vm -I/scratch/jdk9/hotspot/src/os/posix/vm -I../generated -DHOTSPOT_BUILD_USER="\"aph\"" -DHOTSPOT_LIB_ARCH=\"amd64\" -DHOTSPOT_VM_DISTRO="\"OpenJDK\""  -DTARGET_OS_FAMILY_linux -DTARGET_ARCH_x86 -DTARGET_ARCH_MODEL_x86_64 -DTARGET_OS_ARCH_linux_x86 -DTARGET_OS_ARCH_MODEL_linux_x86_64 -DTARGET_COMPILER_gcc -DCOMPILER2 -DCOMPILER1 -fPIC -fno-rtti -fno-exceptions -D_REENTRANT -fcheck-new -fvisibility=hidden -m64  -pipe -fno-strict-aliasing -fno-omit-frame-pointer -O0  -g -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-all --param ssp-buffer-size=1 -D_NMT_NOINLINE_ -DVM_LITTLE_ENDIAN -D_LP64=1 -Wno-error -Wpointer-arith -Wsign-compare -Wundef !
 -Wunused-f
unction -Wunused-value   -DDTRACE_ENABLED -c -MMD -MP -MF ../generated/dependencies/bytecodeInterpreterWithChecks.o.d -fpch-deps -o bytecodeInterpreterWithChecks.o ../generated/jvmtifiles/bytecodeInterpreterWithChecks.cpp
In file included from /usr/include/stdio.h:27:0,
                 from /scratch/jdk9/hotspot/src/share/vm/prims/jni.h:39,
                 from /scratch/jdk9/hotspot/src/share/vm/utilities/globalDefinitions_gcc.hpp:28,
                 from /scratch/jdk9/hotspot/src/share/vm/utilities/globalDefinitions.hpp:33,
                 from /scratch/jdk9/hotspot/src/share/vm/utilities/debug.hpp:28,
                 from /scratch/jdk9/hotspot/src/share/vm/runtime/globals.hpp:28,
                 from /scratch/jdk9/hotspot/src/share/vm/memory/allocation.hpp:28,
                 from /scratch/jdk9/hotspot/src/share/vm/utilities/utf8.hpp:28,
                 from /scratch/jdk9/hotspot/src/share/vm/oops/symbol.hpp:28,
                 from /scratch/jdk9/hotspot/src/share/vm/classfile/vmSymbols.hpp:28,
                 from /scratch/jdk9/hotspot/src/share/vm/interpreter/bytecodeInterpreter.cpp:26,
                 from ../generated/jvmtifiles/bytecodeInterpreterWithChecks.cpp:3:
/usr/include/features.h:327:4: error: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
 #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
    ^
This is quite tricky to fix.  It means that we either have to do
without treating CPP warnings as hard errors or find some way to deal
with setting the _FORTIFY_SOURCE level on files where optimization is
set to -O0.

Any ideas?  maybe this?

Andrew.


diff -r e90276b4908c make/linux/makefiles/gcc.make
--- a/make/linux/makefiles/gcc.make     Fri Jul 25 15:38:08 2014 -0700
+++ b/make/linux/makefiles/gcc.make     Tue Jul 29 14:35:17 2014 +0100
@@ -214,7 +214,7 @@
   WARNINGS_ARE_ERRORS += -Wno-return-type -Wno-empty-body
 endif

 WARNING_FLAGS = -Wpointer-arith -Wsign-compare -Wundef -Wunused-function -Wunused-value -Wformat=2

 ifeq ($(USE_CLANG),)
   # Since GCC 4.3, -Wconversion has changed its meanings to warn these implicit
@@ -230,8 +230,8 @@
 CFLAGS_WARN/BYFILE = $(CFLAGS_WARN/$@)$(CFLAGS_WARN/DEFAULT$(CFLAGS_WARN/$@))

 # optimization control flags (Used by fastdebug and release variants)
-OPT_CFLAGS/NOOPT=-O0
-OPT_CFLAGS/DEBUG=-O0
+OPT_CFLAGS/NOOPT=-O0 -Wno-error=cpp
+OPT_CFLAGS/DEBUG=-O0 -Wno-error=cpp
 OPT_CFLAGS/SIZE=-Os
 OPT_CFLAGS/SPEED=-O3

@@ -339,7 +339,7 @@
 endif

 # Allow no optimizations.
-DEBUG_CFLAGS=-O0
+DEBUG_CFLAGS=-O0 -Wno-error=cpp

 # DEBUG_BINARIES uses full -g debug information for all configs
 ifeq ($(DEBUG_BINARIES), true)