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MORIN" Subject: [Xen-devel] [PATCH 3/7] xen/Rules.mk: fix build with CFLAGS from environment X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: "Yann E. MORIN" When CFLAGS are passed from the environment, the first-level make invocation will append -D__OBJECT_FILE__ to it, then call a second make invocation, that will have those new CFLAGS in its environment, but will also append -D__OBJECT_FILE__ to those. Then, the compiler fails because __OBEJECT_FILE__ is defined twice. Just undefine it before defining it again, as a *workaround* to this issue. Signed-off-by: "Yann E. MORIN" --- xen/Rules.mk | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/xen/Rules.mk b/xen/Rules.mk index 24d13dc..f8b8c2c 100644 --- a/xen/Rules.mk +++ b/xen/Rules.mk @@ -49,7 +49,7 @@ endif CFLAGS += -nostdinc -fno-builtin -fno-common CFLAGS += -Werror -Wredundant-decls -Wno-pointer-arith CFLAGS += -pipe -g -D__XEN__ -include $(BASEDIR)/include/xen/config.h -CFLAGS += '-D__OBJECT_FILE__="$@"' +CFLAGS += -U__OBJECT_FILE__ '-D__OBJECT_FILE__="$@"' ifneq ($(clang),y) # Clang doesn't understand this command line argument, and doesn't appear to