File ipxe.1dd56dbd11082fb622c2ed21cfaced4f47d798a6.p... of Package xen

Overview Repositories Revisions Requests Users Attributes Meta

File ipxe.1dd56dbd11082fb622c2ed21cfaced4f47d798a6.patch of Package xen (Revision 0b83c74f8404b0fa0b6bad11ad7b4b6f)

Currently displaying revision 0b83c74f8404b0fa0b6bad11ad7b4b6f , Show latest

From: Valentine Barshak <gvaxon@gmail.com>
Date: Mon, 22 Jul 2019 10:47:50 +0100
Subject: 1dd56dbd11082fb622c2ed21cfaced4f47d798a6

[build] Workaround compilation error with gcc 9.1

Compiling with gcc 9.1 generates lots of "taking address of packed
member of ... may result in an unaligned pointer value" warnings.

Some of these warnings are genuine, and indicate correctly that parts
of iPXE currently require the CPU (or runtime environment) to support
unaligned accesses.  For example: the TCP/IP receive data path will
attempt to access 32-bit fields that may not be aligned to a 32-bit
boundary.

Other warnings are either spurious (such as when the pointer is to a
variable-length byte array, which can have no alignment requirement
anyway) or unhelpful (such as when the pointer is used solely to
provide a debug colour value for the DBGC() macro).

There appears to be no easy way to silence the spurious warnings.
Since the ability to perform unaligned accesses is already a
requirement for iPXE, work around the problem by silencing this class
of warnings.

Signed-off-by: Valentine Barshak <gvaxon@gmail.com>
Modified-by: Michael Brown <mcb30@ipxe.org>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
---
 src/Makefile.housekeeping | 9 +++++++++
 1 file changed, 9 insertions(+)

--- a/src/Makefile.housekeeping
+++ b/src/Makefile.housekeeping
@@ -176,24 +176,33 @@ endif
 ifeq ($(CCTYPE),gcc)
 WNA_TEST = $(CC) -Waddress -x c -c /dev/null -o /dev/null >/dev/null 2>&1
 WNA_FLAGS := $(shell $(WNA_TEST) && $(ECHO) '-Wno-address')
 WORKAROUND_CFLAGS += $(WNA_FLAGS)
 
 # gcc 8.0 generates warnings for certain suspect string operations. Our
 # sources have been vetted for correct usage.  Turn off these warnings.
 #
 WNST_TEST = $(CC) -Wstringop-truncation -x c -c /dev/null -o /dev/null \
 		  >/dev/null 2>&1
 WNST_FLAGS := $(shell $(WNST_TEST) && $(ECHO) '-Wno-stringop-truncation')
 WORKAROUND_CFLAGS += $(WNST_FLAGS)
+
+# gcc 9.1 generates warnings for taking address of packed member which
+# may result in an unaligned pointer value.  Inhibit the warnings.
+#
+WNAPM_TEST = $(CC) -Wno-address-of-packed-member -x c -c /dev/null \
+		   -o /dev/null >/dev/null 2>&1
+WNAPM_FLAGS := $(shell $(WNAPM_TEST) && \
+		 $(ECHO) '-Wno-address-of-packed-member')
+WORKAROUND_CFLAGS += $(WNAPM_FLAGS)
 endif
 
 # Some versions of gas choke on division operators, treating them as
 # comment markers.  Specifying --divide will work around this problem,
 # but isn't available on older gas versions.
 #
 DIVIDE_TEST = $(AS) --divide /dev/null -o /dev/null 2>/dev/null
 DIVIDE_FLAGS := $(shell $(DIVIDE_TEST) && $(ECHO) '--divide')
 WORKAROUND_ASFLAGS += $(DIVIDE_FLAGS)
 
 ###############################################################################
 #

Places

File ipxe.1dd56dbd11082fb622c2ed21cfaced4f47d798a6.patch of Package xen (Revision 0b83c74f8404b0fa0b6bad11ad7b4b6f)

Places