When trying to build jdk/jdk with GCC 4.4.7, the base compiler on CentOS 6/RHEL 6, compilation fails with:

In file included from /home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMark.hpp:27,
                 from /home/openjdk/openjdk-head/src/hotspot/share/gc/z/zLiveMap.inline.hpp:29,
                 from /home/openjdk/openjdk-head/test/hotspot/gtest/gc/z/test_zLiveMap.cpp:25:
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkStack.hpp:76: error: expected ‘)’ before ‘+’ token
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkStack.hpp:76: error: requested alignment is not a constant
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkStack.hpp:77: error: expected ‘)’ before ‘+’ token
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkStack.hpp:77: error: requested alignment is not a constant
In file included from /home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMark.hpp:28,
                 from /home/openjdk/openjdk-head/src/hotspot/share/gc/z/zLiveMap.inline.hpp:29,
                 from /home/openjdk/openjdk-head/test/hotspot/gtest/gc/z/test_zLiveMap.cpp:25:
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkStackAllocator.hpp:53: error: expected ‘)’ before ‘+’ token
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkStackAllocator.hpp:53: error: requested alignment is not a constant
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkStackAllocator.hpp:54: error: expected ‘)’ before ‘+’ token
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkStackAllocator.hpp:54: error: requested alignment is not a constant
In file included from /home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMark.hpp:29,
                 from /home/openjdk/openjdk-head/src/hotspot/share/gc/z/zLiveMap.inline.hpp:29,
                 from /home/openjdk/openjdk-head/test/hotspot/gtest/gc/z/test_zLiveMap.cpp:25:
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkTerminate.hpp:34: error: expected ‘)’ before ‘+’ token
/home/openjdk/openjdk-head/src/hotspot/share/gc/z/zMarkTerminate.hpp:34: error: requested alignment is not a constant

That is due to ATTRIBUTE_ALIGNED being defined as:

#define ATTRIBUTE_ALIGNED(x) __attribute__((aligned(x+0)))