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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Javier Martinez Canillas <javierm@redhat.com>
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Date: Sat, 12 May 2018 11:29:07 +0200
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Subject: [PATCH] Don't attempt to export the start and _start symbols for
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grub-emu
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Commit 318ee04aadc ("make better backtraces") reworked the backtrace logic
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but the changes lead to the following build error on the grub-emu platform:
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grub_emu_lite-symlist.o:(.data+0xf08): undefined reference to `start'
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collect2: error: ld returned 1 exit status
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make[3]: *** [Makefile:25959: grub-emu-lite] Error 1
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make[3]: *** Waiting for unfinished jobs....
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cat kernel_syms.input | grep -v '^#' | sed -n \
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-e '/EXPORT_FUNC *([a-zA-Z0-9_]*)/{s/.*EXPORT_FUNC *(\([a-zA-Z0-9_]*\)).*/defined kernel '""'\1/;p;}' \
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-e '/EXPORT_VAR *([a-zA-Z0-9_]*)/{s/.*EXPORT_VAR *(\([a-zA-Z0-9_]*\)).*/defined kernel '""'\1/;p;}' \
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| sort -u >kernel_syms.lst
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The problem is that start and _start symbols are exported unconditionally,
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but these aren't defined for grub-emu since is an emultaed platform so it
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doesn't have a startup logic. Don't attempt to export those for grub-emu.
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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---
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include/grub/kernel.h | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/include/grub/kernel.h b/include/grub/kernel.h
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index 300a9766cd..55849777ea 100644
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--- a/include/grub/kernel.h
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+++ b/include/grub/kernel.h
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@@ -111,8 +111,10 @@ grub_addr_t grub_modules_get_end (void);
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#endif
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+#if !defined(GRUB_MACHINE_EMU)
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void EXPORT_FUNC(start) (void);
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void EXPORT_FUNC(_start) (void);
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+#endif
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/* The start point of the C code. */
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void grub_main (void) __attribute__ ((noreturn));
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