iprt/cdefs.h,*: Introducing RT_FLEXIBLE_ARRAY_EXTENSION as a g++ hack that allows us to use RT_FLEXIBLE_ARRAY without the compiler going all pendantic on us. Only tested with 10.1.0. bugref:9746

git-svn-id: https://www.virtualbox.org/svn/vbox/trunk@84509 cfe28804-0f27-0410-a406-dd0f0b0b656f

30 files changed, 68 insertions, 3 deletions

diff --git a/include/VBox/VBoxGuestLibSharedFoldersInline.h b/include/VBox/VBoxGuestLibSharedFoldersInline.h
index fd467eb5823..e17ad886854 100644
--- a/include/VBox/VBoxGuestLibSharedFoldersInline.h
+++ b/include/VBox/VBoxGuestLibSharedFoldersInline.h
@@ -969,6 +969,7 @@ typedef struct VBOXSFREADEMBEDDEDREQ
     VBGLIOCIDCHGCMFASTCALL  Hdr;
     VMMDevHGCMCall          Call;
     VBoxSFParmRead          Parms;
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t                 abData[RT_FLEXIBLE_ARRAY];
 } VBOXSFREADEMBEDDEDREQ;
 
@@ -1116,6 +1117,7 @@ typedef struct VBOXSFWRITEEMBEDDEDREQ
     VBGLIOCIDCHGCMFASTCALL  Hdr;
     VMMDevHGCMCall          Call;
     VBoxSFParmWrite         Parms;
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t                 abData[RT_FLEXIBLE_ARRAY];
 } VBOXSFWRITEEMBEDDEDREQ;
 
diff --git a/include/VBox/vmm/pdmpcidev.h b/include/VBox/vmm/pdmpcidev.h
index 89509485948..7d92463de44 100644
--- a/include/VBox/vmm/pdmpcidev.h
+++ b/include/VBox/vmm/pdmpcidev.h
@@ -243,6 +243,7 @@ typedef struct PDMPCIDEV
      * followed by a MSI-X state area. */
     uint8_t                 abConfig[4096];
     /** The MSI-X state data.  Optional. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t                 abMsixState[RT_FLEXIBLE_ARRAY];
 } PDMPCIDEV;
 #ifdef PDMPCIDEVINT_DECLARED
diff --git a/include/iprt/cdefs.h b/include/iprt/cdefs.h
index 18ccaa9b771..0ad251e6100 100644
--- a/include/iprt/cdefs.h
+++ b/include/iprt/cdefs.h
@@ -2543,6 +2543,9 @@
  * What to up inside the square brackets when declaring a structure member
  * with a flexible size.
  *
+ * @note    RT_FLEXIBLE_ARRAY_EXTENSION must always preceed the type, unless
+ *          it's C-only code.
+ *
  * @note    Use RT_UOFFSETOF() to calculate the structure size.
  *
  * @note    Never to a sizeof() on the structure or member!
@@ -2558,7 +2561,9 @@
  * @sa      RT_FLEXIBLE_ARRAY_NESTED, RT_FLEXIBLE_ARRAY_IN_UNION
  */
 #if RT_MSC_PREREQ(RT_MSC_VER_VS2005) /** @todo Probably much much earlier. */ \
- || (defined(__cplusplus) && RT_GNUC_PREREQ(6, 1) && !RT_GNUC_PREREQ(7, 0)) /* gcc-7 warns again */\
+ || (defined(__cplusplus) && (   RT_GNUC_PREREQ(6, 1) \
+                              && (  !RT_GNUC_PREREQ(7, 0) /* gcc-7 warns again */ \
+                                  || RT_GNUC_PREREQ(10, 0) /* gcc-10 works with __extension__, the ones in between needs testing */ ))) \
  || defined(__WATCOMC__) /* openwatcom 1.9 supports it, we don't care about older atm. */ \
  || RT_CLANG_PREREQ_EX(3, 4, 0) /* Only tested clang v3.4, support is probably older. */
 # define RT_FLEXIBLE_ARRAY
@@ -2575,6 +2580,16 @@
 # define RT_FLEXIBLE_ARRAY                      1
 #endif
 
+/** @def RT_FLEXIBLE_ARRAY_EXTENSION
+ * A trick to make GNU C++ quietly accept flexible arrays in C++ code when
+ * pedantic warnings are enabled.  Put this on the line before the flexible
+ * array. */
+#if (RT_GNUC_PREREQ(10, 0) && defined(__cplusplus)) || defined(DOXGYEN_RUNNING)
+# define RT_FLEXIBLE_ARRAY_EXTENSION            RT_GCC_EXTENSION
+#else
+# define RT_FLEXIBLE_ARRAY_EXTENSION
+#endif
+
 /** @def RT_FLEXIBLE_ARRAY_NESTED
  * Variant of RT_FLEXIBLE_ARRAY for use in structures that are nested.
  *
diff --git a/include/iprt/crypto/applecodesign.h b/include/iprt/crypto/applecodesign.h
index 8ce5e59f3b3..12d25196a77 100644
--- a/include/iprt/crypto/applecodesign.h
+++ b/include/iprt/crypto/applecodesign.h
@@ -147,6 +147,7 @@ typedef struct RTCRAPLCSSUPERBLOB
     /** Number of slots.  Big endian. */
     uint32_t            cSlots;
     /** Slots. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     RTCRAPLCSBLOBSLOT   aSlots[RT_FLEXIBLE_ARRAY];
 } RTCRAPLCSSUPERBLOB;
 AssertCompileMemberOffset(RTCRAPLCSSUPERBLOB, aSlots, 12);
diff --git a/include/iprt/crypto/pem.h b/include/iprt/crypto/pem.h
index cae526566e1..23272ca9c18 100644
--- a/include/iprt/crypto/pem.h
+++ b/include/iprt/crypto/pem.h
@@ -89,6 +89,7 @@ typedef struct RTCRPEMFIELD
     /** The field name length. */
     size_t              cchName;
     /** The field name. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char                szName[RT_FLEXIBLE_ARRAY];
 } RTCRPEMFIELD;
 /** Pointer to a PEM field. */
diff --git a/include/iprt/formats/iso9660.h b/include/iprt/formats/iso9660.h
index c252b544c13..f57e2a545b2 100644
--- a/include/iprt/formats/iso9660.h
+++ b/include/iprt/formats/iso9660.h
@@ -238,6 +238,7 @@ typedef struct ISO9660PATHREC
      * @note Endianess depends on table.  */
     uint16_t            idParentRec;
     /** 0x08: Directory identifier (d-characters or d1-characters). */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char                achDirId[RT_FLEXIBLE_ARRAY];
     /* There will be a zero padding byte following if the directory identifier length is odd. */
 } ISO9660PATHREC;
@@ -290,6 +291,7 @@ typedef struct ISO9660EXATTRREC
     /** 0x0f6: Length of the application use field. */
     ISO9660U16          cbAppUse;
     /** 0x0fa: Variable sized application use field. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t             abAppUse[RT_FLEXIBLE_ARRAY];
     /* This is followed by escape sequences with length given by cbEscapeSequnces. */
 } ISO9660EXATTRREC;
diff --git a/include/iprt/formats/mach-o.h b/include/iprt/formats/mach-o.h
index 67e69c5b640..7850349b04f 100644
--- a/include/iprt/formats/mach-o.h
+++ b/include/iprt/formats/mach-o.h
@@ -631,6 +631,7 @@ typedef struct build_version_command
     uint32_t            minos;      /**< Minimum OS version: 31..16=major, 15..8=minor, 7..0=patch */
     uint32_t            sdk;        /**< SDK version:        31..16=major, 15..8=minor, 7..0=patch */
     uint32_t            ntools;     /**< Number of build_tool_version entries following in aTools. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     build_tool_version_t aTools[RT_FLEXIBLE_ARRAY];
 } build_version_command_t;
 AssertCompileMemberOffset(build_version_command_t, aTools, 24);
diff --git a/include/iprt/formats/ntfs.h b/include/iprt/formats/ntfs.h
index bbf124de541..f4eaace5b18 100644
--- a/include/iprt/formats/ntfs.h
+++ b/include/iprt/formats/ntfs.h
@@ -380,6 +380,7 @@ typedef struct NTFSATLISTENTRY
     /** 0x18: Attribute instance number.  Unique within the MFT record. */
     uint16_t            idAttrib;
     /** 0x1a: Maybe where the attribute name starts. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     RTUTF16             wszName[RT_FLEXIBLE_ARRAY];
 } NTFSATLISTENTRY;
 AssertCompileMemberOffset(NTFSATLISTENTRY, idAttrib, 0x18);
@@ -498,6 +499,7 @@ typedef struct NTFSATFILENAME
     /** 0x41: Filename type (NTFS_FILENAME_T_XXX). */
     uint8_t             fFilenameType;
     /** 0x42: The filename. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     RTUTF16             wszFilename[RT_FLEXIBLE_ARRAY];
 } NTFSATFILENAME;
 AssertCompileMemberOffset(NTFSATFILENAME, cbData, 0x30);
diff --git a/include/iprt/formats/pecoff.h b/include/iprt/formats/pecoff.h
index 5499709b2cb..9e07a7a0baa 100644
--- a/include/iprt/formats/pecoff.h
+++ b/include/iprt/formats/pecoff.h
@@ -720,7 +720,8 @@ typedef struct IMAGE_UNWIND_INFO
     /** Scaled frame register offset. */
     RT_GCC_EXTENSION uint8_t    FrameOffset : 4;
     /** Unwind opcodes. */
-    IMAGE_UNWIND_CODE   aOpcodes[RT_FLEXIBLE_ARRAY];
+    RT_FLEXIBLE_ARRAY_EXTENSION
+    IMAGE_UNWIND_CODE           aOpcodes[RT_FLEXIBLE_ARRAY];
 } IMAGE_UNWIND_INFO;
 AssertCompileMemberOffset(IMAGE_UNWIND_INFO, aOpcodes, 4);
 typedef IMAGE_UNWIND_INFO *PIMAGE_UNWIND_INFO;
diff --git a/include/iprt/formats/udf.h b/include/iprt/formats/udf.h
index b307120d226..bc056a3cc3f 100644
--- a/include/iprt/formats/udf.h
+++ b/include/iprt/formats/udf.h
@@ -791,6 +791,7 @@ typedef struct UDFLOGICALVOLUMEDESC
     UDFEXTENTAD     IntegritySeqExtent;
     /** 0x1b8: Partition maps (length given by @a cbMapTable), data format is
      * defined by UDFPARTMAPHDR, UDFPARTMAPTYPE1 and UDFPARTMAPTYPE2. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t         abPartitionMaps[RT_FLEXIBLE_ARRAY];
 } UDFLOGICALVOLUMEDESC;
 AssertCompileMemberOffset(UDFLOGICALVOLUMEDESC, abPartitionMaps, 0x1b8);
@@ -924,6 +925,7 @@ typedef struct UDFUNALLOCATEDSPACEDESC
     /** 0x14: Number of allocation descriptors in the array below. */
     uint32_t        cAllocationDescriptors;
     /** 0x18: Allocation descriptors (variable length). */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     UDFEXTENTAD     aAllocationDescriptors[RT_FLEXIBLE_ARRAY];
 } UDFUNALLOCATEDSPACEDESC;
 AssertCompileMemberOffset(UDFUNALLOCATEDSPACEDESC, aAllocationDescriptors, 0x18);
@@ -974,6 +976,7 @@ typedef struct UDFLOGICALVOLINTEGRITYDESC
      * Following these tables there are @a cbImplementationUse bytes of space for
      * the implementation to use.
      */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint32_t        aTables[RT_FLEXIBLE_ARRAY];
 } UDFLOGICALVOLINTEGRITYDESC;
 AssertCompileMemberOffset(UDFLOGICALVOLINTEGRITYDESC, cbImplementationUse, 0x2c);
@@ -1074,6 +1077,7 @@ typedef struct UDFFILEIDDESC
      * implementation use field with length given by @a cbImplementationUse.
      * After that is a d-string field with the name of the file, length
      * specified by @a cbName. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t         abImplementationUse[RT_FLEXIBLE_ARRAY];
 } UDFFILEIDDESC;
 AssertCompileMemberOffset(UDFFILEIDDESC, fFlags,              0x12);
@@ -1357,6 +1361,7 @@ typedef struct UDFFILEENTRY
     uint32_t        cbAllocDescs;
     /** 0xb0: Two variable sized fields.  First @a cbExtAttribs bytes of extended
      *  attributes, then @a cbAllocDescs bytes of allocation descriptors. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t         abExtAttribs[RT_FLEXIBLE_ARRAY];
 } UDFFILEENTRY;
 AssertCompileMemberOffset(UDFFILEENTRY, abExtAttribs, 0xb0);
@@ -1970,6 +1975,7 @@ typedef struct UDFSPACEBITMAPDESC
     /** 0x14: The bitmap size in bytes. */
     uint32_t        cbBitmap;
     /** 0x18: The bitmap. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t         abBitmap[RT_FLEXIBLE_ARRAY];
 } UDFSPACEBITMAPDESC;
 AssertCompileMemberOffset(UDFSPACEBITMAPDESC, abBitmap, 0x18);
@@ -1999,6 +2005,7 @@ typedef struct UDFPARTITIONINTEGRITYDESC
     /** 0x0e0: Implementation identifier. */
     UDFENTITYID     idImplementation;
     /** 0x100: Implementation use data. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t         abImplementationUse[RT_FLEXIBLE_ARRAY];
 } UDFPARTITIONINTEGRITYDESC;
 AssertCompileMemberOffset(UDFPARTITIONINTEGRITYDESC, abImplementationUse, 0x100);
@@ -2066,6 +2073,7 @@ typedef struct UDFEXFILEENTRY
     uint32_t        cbAllocDescs;
     /** 0xd8: Two variable sized fields.  First @a cbExtAttribs bytes of extended
      *  attributes, then @a cbAllocDescs bytes of allocation descriptors. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t         abExtAttribs[RT_FLEXIBLE_ARRAY];
 } UDFEXFILEENTRY;
 AssertCompileMemberOffset(UDFEXFILEENTRY, abExtAttribs, 0xd8);
diff --git a/include/iprt/nt/hyperv.h b/include/iprt/nt/hyperv.h
index 649625ad8b4..830e4072a15 100644
--- a/include/iprt/nt/hyperv.h
+++ b/include/iprt/nt/hyperv.h
@@ -35,6 +35,7 @@
 # include <iprt/assertcompile.h>
 #else
 # define RT_FLEXIBLE_ARRAY
+# define RT_FLEXIBLE_ARRAY_EXTENSION
 # define AssertCompile(expr)
 # define AssertCompileSize(type, size)
 # define AssertCompileMemberOffset(type, member, off)
@@ -497,6 +498,7 @@ typedef struct
     HV_MAP_GPA_FLAGS    MapFlags;
     uint32_t            u32ExplicitPadding;
     /* The repeating part: */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     HV_SPA_PAGE_NUMBER  PageList[RT_FLEXIBLE_ARRAY];
 } HV_INPUT_MAP_GPA_PAGES;
 AssertCompileMemberOffset(HV_INPUT_MAP_GPA_PAGES, PageList, 24);
@@ -520,6 +522,7 @@ typedef struct
     HV_MAP_GPA_FLAGS    MapFlags;
     uint32_t            u32ExplicitPadding;
     /* The repeating part: */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     HV_GPA_MAPPING      PageList[RT_FLEXIBLE_ARRAY];
 } HV_INPUT_MAP_SPARSE_GPA_PAGES;
 AssertCompileMemberOffset(HV_INPUT_MAP_SPARSE_GPA_PAGES, PageList, 16);
@@ -1233,6 +1236,7 @@ typedef struct
     /** Was this introduced after v2? Dunno what it it really is. */
     uint32_t            fFlags;
     /* The repeating part: */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     HV_REGISTER_NAME    Names[RT_FLEXIBLE_ARRAY];
 } HV_INPUT_GET_VP_REGISTERS;
 AssertCompileMemberOffset(HV_INPUT_GET_VP_REGISTERS, Names, 16);
@@ -1267,6 +1271,7 @@ typedef struct
     HV_VP_INDEX         VpIndex;
     uint32_t            RsvdZ;
     /* The repeating part: */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     HV_REGISTER_ASSOC   Elements[RT_FLEXIBLE_ARRAY];
 } HV_INPUT_SET_VP_REGISTERS;
 AssertCompileMemberOffset(HV_INPUT_SET_VP_REGISTERS, Elements, 16);
diff --git a/include/iprt/path.h b/include/iprt/path.h
index 18840d90c5f..34ef2a505ba 100644
--- a/include/iprt/path.h
+++ b/include/iprt/path.h
@@ -740,6 +740,7 @@ typedef struct RTPATHPARSED
      * @note Don't try figure the end of the input path by adding up off and cch
      *       of the last component.  If RTPATH_PROP_DIR_SLASH is set, there may
      *       be one or more trailing slashes that are unaccounted for! */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     struct
     {
         /** The offset of the component. */
@@ -832,6 +833,7 @@ typedef struct RTPATHSPLIT
      * present. */
     const char *pszSuffix;
     /** Array of component strings (variable size). */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char       *apszComps[RT_FLEXIBLE_ARRAY];
 } RTPATHSPLIT;
 /** Pointer to a split path buffer. */
diff --git a/src/VBox/Additions/os2/VBoxSF/VBoxSFInternal.h b/src/VBox/Additions/os2/VBoxSF/VBoxSFInternal.h
index 9306d585476..d473e6dade3 100644
--- a/src/VBox/Additions/os2/VBoxSF/VBoxSFInternal.h
+++ b/src/VBox/Additions/os2/VBoxSF/VBoxSFInternal.h
@@ -86,6 +86,7 @@ typedef struct VBOXSFFOLDER
     /** The length of the folder name. */
     uint8_t             cchName;
     /** The shared folder name.  If there is a tag it follows as a second string. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char                szName[RT_FLEXIBLE_ARRAY];
 } VBOXSFFOLDER;
 /** Pointer to a shared folder. */
diff --git a/src/VBox/Devices/VirtIO/Virtio_1_0.cpp b/src/VBox/Devices/VirtIO/Virtio_1_0.cpp
index 42e219cb945..3b4e57cae15 100644
--- a/src/VBox/Devices/VirtIO/Virtio_1_0.cpp
+++ b/src/VBox/Devices/VirtIO/Virtio_1_0.cpp
@@ -95,6 +95,7 @@ typedef struct virtq_avail
 {
     uint16_t  fFlags;                                            /**< flags      avail ring guest-to-host flags */
     uint16_t  uIdx;                                              /**< idx        Index of next free ring slot   */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint16_t  auRing[RT_FLEXIBLE_ARRAY];                         /**< ring       Ring: avail drv to dev bufs    */
     /* uint16_t  uUsedEventIdx;                                     - used_event (if VIRTQ_USED_F_EVENT_IDX)    */
 } VIRTQ_AVAIL_T, *PVIRTQ_AVAIL_T;
@@ -109,6 +110,7 @@ typedef struct virt_used
 {
     uint16_t  fFlags;                                            /**< flags       used ring host-to-guest flags */
     uint16_t  uIdx;                                              /**< idx         Index of next ring slot       */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     VIRTQ_USED_ELEM_T aRing[RT_FLEXIBLE_ARRAY];                  /**< ring        Ring: used dev to drv bufs    */
     /* uint16_t  uAvailEventIdx;                                    - avail_event if (VIRTQ_USED_F_EVENT_IDX)   */
 } VIRTQ_USED_T, *PVIRTQ_USED_T;
diff --git a/src/VBox/Devices/testcase/tstDeviceInternal.h b/src/VBox/Devices/testcase/tstDeviceInternal.h
index b1cc5193e74..53cf919744e 100644
--- a/src/VBox/Devices/testcase/tstDeviceInternal.h
+++ b/src/VBox/Devices/testcase/tstDeviceInternal.h
@@ -130,6 +130,7 @@ typedef struct TSTDEVMMHEAPALLOC
     /** Size of the allocation. */
     size_t                          cbAlloc;
     /** Start of the real allocation. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t                         abAlloc[RT_FLEXIBLE_ARRAY];
 } TSTDEVMMHEAPALLOC;
 /** Pointer to a MM Heap allocation. */
diff --git a/src/VBox/HostServices/GuestControl/VBoxGuestControlSvc.cpp b/src/VBox/HostServices/GuestControl/VBoxGuestControlSvc.cpp
index 2187a085572..793c52f6c56 100644
--- a/src/VBox/HostServices/GuestControl/VBoxGuestControlSvc.cpp
+++ b/src/VBox/HostServices/GuestControl/VBoxGuestControlSvc.cpp
@@ -842,6 +842,7 @@ typedef struct GstCtrlPreparedSession
     /** The key size. */
     uint32_t    cbKey;
     /** The key bytes. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t     abKey[RT_FLEXIBLE_ARRAY];
 } GstCtrlPreparedSession;
 
diff --git a/src/VBox/HostServices/SharedClipboard/VBoxSharedClipboardSvc-internal.h b/src/VBox/HostServices/SharedClipboard/VBoxSharedClipboardSvc-internal.h
index 82737b7c3ce..fe0e23ac93c 100644
--- a/src/VBox/HostServices/SharedClipboard/VBoxSharedClipboardSvc-internal.h
+++ b/src/VBox/HostServices/SharedClipboard/VBoxSharedClipboardSvc-internal.h
@@ -56,6 +56,7 @@ typedef struct _SHCLCLIENTMSG
     /** Number of stored parameters in aParms. */
     uint32_t            cParms;
     /** HGCM parameters. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     VBOXHGCMSVCPARM     aParms[RT_FLEXIBLE_ARRAY];
 } SHCLCLIENTMSG;
 /** Pointer to a queue message for the guest.   */
diff --git a/src/VBox/Runtime/common/checksum/manifest2.cpp b/src/VBox/Runtime/common/checksum/manifest2.cpp
index be3082b220b..ba0a8f1f4a2 100644
--- a/src/VBox/Runtime/common/checksum/manifest2.cpp
+++ b/src/VBox/Runtime/common/checksum/manifest2.cpp
@@ -64,6 +64,7 @@ typedef struct RTMANIFESTATTR
     /** Whether it was visited by the equals operation or not. */
     bool                fVisited;
     /** The normalized property name that StrCore::pszString points at. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char                szName[RT_FLEXIBLE_ARRAY];
 } RTMANIFESTATTR;
 /** Pointer to a manifest attribute. */
diff --git a/src/VBox/Runtime/common/dbg/dbgmodmapsym.cpp b/src/VBox/Runtime/common/dbg/dbgmodmapsym.cpp
index 2847eb43516..e9f93f80bef 100644
--- a/src/VBox/Runtime/common/dbg/dbgmodmapsym.cpp
+++ b/src/VBox/Runtime/common/dbg/dbgmodmapsym.cpp
@@ -66,6 +66,7 @@ typedef struct MAPSYMHDR
     uint16_t    off16SegDef;                    /**< 0x0c: Offset of the segment defintions divided by 16. */
     uint8_t     cchMaxSym;                      /**< 0x0e: Maximum symbol-name length. */
     uint8_t     cchModule;                      /**< 0x0f: Length of the module name. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char        achModule[RT_FLEXIBLE_ARRAY];   /**< 0x10: Module name, length given by cchModule. */
 } MAPSYMHDR;
 
@@ -91,6 +92,7 @@ typedef struct MAPSYMSEGDEF
     uint16_t    offLineDef;                    /**< 0x10: Offset to the line defintions. */
     uint16_t    u16Reserved2;                  /**< 0x12: Reserved / unknown.  Often seen holding 0xff00. */
     uint8_t     cchSegName;                    /**< 0x14: Segment name length. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char        achSegName[RT_FLEXIBLE_ARRAY]; /**< 0x15: Segment name, length given by cchSegName. */
 } MAPSYMSEGDEF;
 
@@ -121,6 +123,7 @@ typedef struct MAPSYMLINEDEF
     uint16_t    offLines;                      /**< 0x04: Offset to the line number array, relative to this structure. */
     uint16_t    cLines;                        /**< 0x08: Number of line numbers in the array. */
     uint8_t     cchSrcFile;                    /**< 0x0a: Length of source filename. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char        achSrcFile[RT_FLEXIBLE_ARRAY]; /**< 0x0b: Source filename, length given by cchSrcFile. */
 } MAPSYMLINEDEF;
 
diff --git a/src/VBox/Runtime/common/fs/RTFsCmdLs.cpp b/src/VBox/Runtime/common/fs/RTFsCmdLs.cpp
index ae9239bb043..0dd42226f17 100644
--- a/src/VBox/Runtime/common/fs/RTFsCmdLs.cpp
+++ b/src/VBox/Runtime/common/fs/RTFsCmdLs.cpp
@@ -63,6 +63,7 @@ typedef struct RTCMDLSENTRY
     /** The length of szName. */
     size_t      cchName;
     /** The entry name. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char        szName[RT_FLEXIBLE_ARRAY];
 } RTCMDLSENTRY;
 /** Pointer to a ls display entry. */
@@ -89,6 +90,7 @@ typedef struct RTCMDLSCOLLECTION
     uint64_t        cbTotalFiles;
 
     /** The collection name (path). */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char            szName[RT_FLEXIBLE_ARRAY];
 } RTCMDLSCOLLECTION;
 /** Pointer to a display entry collection.  */
diff --git a/src/VBox/Runtime/common/fs/fatvfs.cpp b/src/VBox/Runtime/common/fs/fatvfs.cpp
index 1654c40fada..3dac9e926ab 100644
--- a/src/VBox/Runtime/common/fs/fatvfs.cpp
+++ b/src/VBox/Runtime/common/fs/fatvfs.cpp
@@ -319,6 +319,7 @@ typedef struct RTFSFATCLUSTERMAPCACHE
     /** The cache name. */
     const char             *pszName;
     /** Cache entries. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     RTFSFATCLUSTERMAPENTRY  aEntries[RT_FLEXIBLE_ARRAY];
 } RTFSFATCLUSTERMAPCACHE;
 /** Pointer to a FAT linear metadata cache. */
diff --git a/src/VBox/Runtime/common/fs/isomaker.cpp b/src/VBox/Runtime/common/fs/isomaker.cpp
index c7d248cdd22..5eecc56eebf 100644
--- a/src/VBox/Runtime/common/fs/isomaker.cpp
+++ b/src/VBox/Runtime/common/fs/isomaker.cpp
@@ -257,6 +257,7 @@ typedef struct RTFSISOMAKERNAME
     /** The name length. */
     uint16_t                cchName;
     /** The name. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char                    szName[RT_FLEXIBLE_ARRAY];
 } RTFSISOMAKERNAME;
 
@@ -447,6 +448,7 @@ typedef struct RTFSISOMAKERSYMLINK
     /** The symbolic link target length. */
     uint16_t                cchTarget;
     /** The symbolic link target. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char                    szTarget[RT_FLEXIBLE_ARRAY];
 } RTFSISOMAKERSYMLINK;
 /** Pointer to an ISO maker directory object.  */
diff --git a/src/VBox/Runtime/common/ldr/ldrLX.cpp b/src/VBox/Runtime/common/ldr/ldrLX.cpp
index 6992e08af0a..93d16152006 100644
--- a/src/VBox/Runtime/common/ldr/ldrLX.cpp
+++ b/src/VBox/Runtime/common/ldr/ldrLX.cpp
@@ -156,6 +156,7 @@ typedef struct KLDRMODLX
     /** Number of segments in aSegments. */
     uint32_t                cSegments;
     /** Segment info. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     RTLDRSEG                aSegments[RT_FLEXIBLE_ARRAY];
 } KLDRMODLX, *PKLDRMODLX;
 
diff --git a/src/VBox/Runtime/common/vfs/vfsfss2dir.cpp b/src/VBox/Runtime/common/vfs/vfsfss2dir.cpp
index 8a92fa0f9c0..a7ac4851a32 100644
--- a/src/VBox/Runtime/common/vfs/vfsfss2dir.cpp
+++ b/src/VBox/Runtime/common/vfs/vfsfss2dir.cpp
@@ -64,6 +64,7 @@ typedef struct RTVFSFSSWRITE2DIRENTRY
 #else
     /** The name (relative to RTVFSFSSWRITE2DIR::szBaseDir). */
 #endif
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char            szName[RT_FLEXIBLE_ARRAY];
 } RTVFSFSSWRITE2DIRENTRY;
 /** Pointer to a RTVFSFSSWRITE2DIR undo entry. */
@@ -86,6 +87,7 @@ typedef struct RTVFSFSSWRITE2DIR
     RTVFSDIR        hVfsBaseDir;
 #else
     /** Path to the directory that all operations are relative to. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char            szBaseDir[RT_FLEXIBLE_ARRAY];
 #endif
 } RTVFSFSSWRITE2DIR;
diff --git a/src/VBox/Runtime/common/vfs/vfsstddir.cpp b/src/VBox/Runtime/common/vfs/vfsstddir.cpp
index 2852428cd0d..e42ec7d8495 100644
--- a/src/VBox/Runtime/common/vfs/vfsstddir.cpp
+++ b/src/VBox/Runtime/common/vfs/vfsstddir.cpp
@@ -74,6 +74,7 @@ typedef struct RTVFSSTDSYMLINK
     /** Pointer to the VFS directory where the symbolic link lives . */
     PRTVFSSTDDIR    pDir;
     /** The symbolic link name. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char            szSymlink[RT_FLEXIBLE_ARRAY];
 } RTVFSSTDSYMLINK;
 /** Pointer to the private data of a standard symbolic link. */
diff --git a/src/VBox/Runtime/generic/ftp-server.cpp b/src/VBox/Runtime/generic/ftp-server.cpp
index 7bdae26420a..700deaa761f 100644
--- a/src/VBox/Runtime/generic/ftp-server.cpp
+++ b/src/VBox/Runtime/generic/ftp-server.cpp
@@ -104,6 +104,7 @@ typedef struct RTFTPDIRENTRY
     /** The length of szName. */
     size_t      cchName;
     /** The entry name. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char        szName[RT_FLEXIBLE_ARRAY];
 } RTFTPDIRENTRY;
 /** Pointer to a FTP directory entry. */
diff --git a/src/VBox/Runtime/generic/http-curl.cpp b/src/VBox/Runtime/generic/http-curl.cpp
index 71b4a44a598..86a3a706644 100644
--- a/src/VBox/Runtime/generic/http-curl.cpp
+++ b/src/VBox/Runtime/generic/http-curl.cpp
@@ -127,7 +127,8 @@ typedef struct RTHTTPHEADER
     /** The value offset. */
     uint32_t            offValue;
     /** The full header field. */
-    char                szData[RT_FLEXIBLE_ARRAY];
+    RT_FLEXIBLE_ARRAY_EXTENSION
+    RT_GCC_EXTENSION char szData[RT_FLEXIBLE_ARRAY];
 } RTHTTPHEADER;
 /** Pointer to a HTTP header. */
 typedef RTHTTPHEADER *PRTHTTPHEADER;
diff --git a/src/VBox/Runtime/tools/RTLdrCheckImports.cpp b/src/VBox/Runtime/tools/RTLdrCheckImports.cpp
index e052e42790d..30abcbbc7a7 100644
--- a/src/VBox/Runtime/tools/RTLdrCheckImports.cpp
+++ b/src/VBox/Runtime/tools/RTLdrCheckImports.cpp
@@ -102,6 +102,7 @@ typedef struct RTCHECKIMPORTSTATE
     /** Number modules. */
     uint32_t                cImports;
     /** Import modules. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     RTCHECKIMPORTMODULE     aImports[RT_FLEXIBLE_ARRAY];
 } RTCHECKIMPORTSTATE;
 /** Pointer to the import checker state. */
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/VBoxBs3ObjConverter.cpp b/src/VBox/ValidationKit/bootsectors/bs3kit/VBoxBs3ObjConverter.cpp
index 7f3186fac63..ce8e14a3110 100644
--- a/src/VBox/ValidationKit/bootsectors/bs3kit/VBoxBs3ObjConverter.cpp
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/VBoxBs3ObjConverter.cpp
@@ -3806,6 +3806,7 @@ typedef struct OMFDETAILSALLOC
     /** Pointer to the next allocation. */
     struct OMFDETAILSALLOC *pNext;
     /** The allocated bytes. */
+    RT_FLEXIBLE_ARRAY_EXTENSION
     uint8_t                 abData[RT_FLEXIBLE_ARRAY];
 } OMFDETAILSALLOC;
 typedef OMFDETAILSALLOC *POMFDETAILSALLOC;
diff --git a/src/VBox/ValidationKit/utils/fs/FsPerf.cpp b/src/VBox/ValidationKit/utils/fs/FsPerf.cpp
index 2b0ee70a1fe..fe3e9924e53 100644
--- a/src/VBox/ValidationKit/utils/fs/FsPerf.cpp
+++ b/src/VBox/ValidationKit/utils/fs/FsPerf.cpp
@@ -267,6 +267,7 @@ typedef struct FSPERFNAMEENTRY
 {
     RTLISTNODE  Entry;
     uint16_t    cchName;
+    RT_FLEXIBLE_ARRAY_EXTENSION
     char        szName[RT_FLEXIBLE_ARRAY];
 } FSPERFNAMEENTRY;
 typedef FSPERFNAMEENTRY *PFSPERFNAMEENTRY;