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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - big-endian arm32 linux kernel builds fail"
href="https://bugs.llvm.org/show_bug.cgi?id=38770">38770</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>big-endian arm32 linux kernel builds fail
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>arnd@linaro.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The kernel uses "-no-integrated-as", so clang calls the GNU assembler instead.
When that assembler is targetted at little-endian output, we are missing the
-EB
flag, so the output ends up being little-endian anyway, and causing a link
failure in the end.
I could work around the problem by passing -EB to the assembler as well as the
linker, but I would expect this to be implied by -mbig-endian.
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -45,8 +45,8 @@ KBUILD_CFLAGS +=-fno-omit-frame-pointer -mapcs
-mno-sched-prolog
endif
ifeq ($(CONFIG_CPU_BIG_ENDIAN),y)
-KBUILD_CPPFLAGS += -mbig-endian
-KBUILD_BIARCHFLAGS += -mbig-endian
+KBUILD_CPPFLAGS += -mbig-endian -Wa,-EB
+KBUILD_BIARCHFLAGS += -mbig-endian -Wa,-EB
CHECKFLAGS += -D__ARMEB__
AS += -EB
KBUILD_LDFLAGS += -EB
--- a/arch/arm/vdso/Makefile
+++ b/arch/arm/vdso/Makefile
@@ -17,6 +17,10 @@ VDSO_LDFLAGS += $(call cc-ldoption,
-Wl$(comma)--hash-style=sysv)
VDSO_LDFLAGS += $(call cc-ldoption, -Wl$(comma)--build-id)
VDSO_LDFLAGS += $(call cc-ldoption, -fuse-ld=bfd)
+ifdef CONFIG_CPU_BIG_ENDIAN
+VDSO_LDFLAGS += -Wl,-EB
+endif
+
obj-$(CONFIG_VDSO) += vdso.o
extra-$(CONFIG_VDSO) += vdso.lds
CPPFLAGS_vdso.lds += -P -C -U$(ARCH)</pre>
</div>
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