From df4d2000a22db673a788b8e57e8e7c0cc3cee777 Mon Sep 17 00:00:00 2001
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From: Leonard Chan <leonardchan@google.com>
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Date: Thu, 3 Oct 2019 18:53:04 -0700
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Subject: [PATCH] Make vboot_version extern in header
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When enabling `-fno-common` in Fuchsia, we get a bunch of linker errors
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when linking futility:
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```
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ld.lld: error: duplicate symbol: vboot_version
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>>> defined at futility.h:43 (../../third_party/vboot_reference/futility/futility.h:43)
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>>> host_x63-asan_no_detect_leaks/obj/third_party/vboot_reference/futility/futility.cmd_bdb.c.o:(vboot_version)
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>>> defined at futility.h:43 (../../third_party/vboot_reference/futility/futility.h:43)
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>>> host_x64-asan_no_detect_leaks/obj/third_party/vboot_reference/futility/futility.cmd_create.c.o:(.bss.vboot_version+0x0)
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```
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and think this is because -fno-common places vboot_version for
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unitialized global variables in the BSS section of each object file.
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Making it extern instead resolves each reference to its definition in
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futility/misc.c.
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Change-Id: I591f07abd1f975a8a9d078bb4366e2e0861390b4
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Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/1839207
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Reviewed-by: Julius Werner <jwerner@chromium.org>
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Reviewed-by: Joel Kitching <kitching@chromium.org>
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Commit-Queue: Julius Werner <jwerner@chromium.org>
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Tested-by: Julius Werner <jwerner@chromium.org>
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Patch taken from upstream: https://chromium.googlesource.com/chromiumos/platform/vboot_reference/+/df4d2000a22db673a788b8e57e8e7c0cc3cee777
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Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
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---
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futility/futility.h | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/futility/futility.h b/futility/futility.h
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index 3bce1106..5dc426dd 100644
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--- a/futility/futility.h
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+++ b/futility/futility.h
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@@ -41,7 +41,7 @@ enum vboot_version {
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};
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/* What's our preferred API & data format? */
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-enum vboot_version vboot_version;
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+extern enum vboot_version vboot_version;
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/* Here's a structure to define the commands that futility implements. */
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struct futil_cmd_t {
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--
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2.20.1
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