From a58cabd0e355fc51f18db359ba260da268df26ef Mon Sep 17 00:00:00 2001 From: Daniele Buono Date: Thu, 5 Nov 2020 17:19:00 -0500 Subject: s390x: Avoid variable size warning in ipl.h S390IPLState contains two IplParameterBlock, which may in turn have either a IPLBlockPV or a IplBlockFcp, both ending with a variable sized field (an array). This causes a warning with clang 11 or greater, which checks that variable sized type are only allocated at the end of the struct: In file included from ../qemu-cfi-v3/target/s390x/diag.c:21: ../qemu-cfi-v3/hw/s390x/ipl.h:161:23: error: field 'iplb' with variable sized type 'IplParameterBlock' (aka 'union IplParameterBlock') not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end] IplParameterBlock iplb; ^ ../qemu-cfi-v3/hw/s390x/ipl.h:162:23: error: field 'iplb_pv' with variable sized type 'IplParameterBlock' (aka 'union IplParameterBlock') not at the end of a struct or class is a GNU extension [-Werror,-Wgnu-variable-sized-type-not-at-end] IplParameterBlock iplb_pv; In this case, however, the warning is a false positive, because IPLBlockPV and IplBlockFcp are allocated in a union wrapped at 4K, making the union non-variable sized. Fix the warning by turning the two variable sized arrays into arrays of size 0. This avoids the compiler error and should produce the same code. Signed-off-by: Daniele Buono Message-Id: <20201105221905.1350-5-dbuono@linux.vnet.ibm.com> Acked-by: Cornelia Huck Signed-off-by: Thomas Huth --- hw/s390x/ipl.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'hw/s390x') diff --git a/hw/s390x/ipl.h b/hw/s390x/ipl.h index 9e90169695..dfc6dfd89c 100644 --- a/hw/s390x/ipl.h +++ b/hw/s390x/ipl.h @@ -32,7 +32,7 @@ struct IPLBlockPV { uint32_t num_comp; /* 0x74 */ uint64_t pv_header_addr; /* 0x78 */ uint64_t pv_header_len; /* 0x80 */ - struct IPLBlockPVComp components[]; + struct IPLBlockPVComp components[0]; } QEMU_PACKED; typedef struct IPLBlockPV IPLBlockPV; @@ -63,7 +63,7 @@ struct IplBlockFcp { uint64_t br_lba; uint32_t scp_data_len; uint8_t reserved6[260]; - uint8_t scp_data[]; + uint8_t scp_data[0]; } QEMU_PACKED; typedef struct IplBlockFcp IplBlockFcp; -- cgit v1.2.3-55-g7522