From: Daniele Buono <dbuono@linux.vnet.ibm.com>
Date: Thu, 5 Nov 2020 22:19:00 +0000 (-0500)
Subject: s390x: Avoid variable size warning in ipl.h
X-Git-Tag: v5.2.0-rc1~2^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a58cabd0e355fc51f18db359ba260da268df26ef;p=thirdparty%2Fqemu.git

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 <dbuono@linux.vnet.ibm.com>
Message-Id: <20201105221905.1350-5-dbuono@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---

diff --git a/hw/s390x/ipl.h b/hw/s390x/ipl.h
index 9e901696951..dfc6dfd89c8 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;