From 694eba7bb974f6b8bd308804cb24350150108b2b Mon Sep 17 00:00:00 2001
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From: He Zhe <zhe.he@windriver.com>
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Date: Wed, 21 Nov 2018 15:12:43 +0800
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Subject: [PATCH] scripts: Use fixed input and output files instead of pipe for here-doc
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There was a bug of "as" in binutils that when it checks if the input file and
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output file are the same one, it would not check if they are on the same block
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device. The check is introduced by the following commit in v2.31.
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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=
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67f846b59b32f3d704c601669409c2584383fea9
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The here-doc usage in this script creates temporary file in /tmp. When we run in
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an environment where /tmp has rarely been used, the newly created temporary file
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may have a very low inode number. If the inode number was 6 which is the same as
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/dev/null, the as would wrongly think the input file and the output file are the
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same and report the following error.
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*** Compiler lacks asm-goto support.. Stop.
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One observed case happened in docker where the /tmp could be so rarely used that
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very low number inode may be allocated and triggers the error.
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The fix below for the bug only exists on the master branch of binutils so far
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and has not been released from upstream. As the convict is introduced since
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v2.31, only v2.31 is affected.
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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commit;h=
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2a50366ded329bfb39d387253450c9d5302c3503
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When building linux-libc-headers we need to use "as" in binutils which does not
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contain the fix for the moment. To work around the error, we create a fixed
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temporary file to contain the program being tested.
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This patch also removes ">/dev/null 2>&1" so we will have more direct error
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information in case something else wrong happened.
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Upstream-Status: Inappropriate [A work around for binutils v2.31]
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Signed-off-by: He Zhe <zhe.he@windriver.com>
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---
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scripts/gcc-goto.sh | 5 ++++-
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1 file changed, 4 insertions(+), 1 deletion(-)
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diff --git a/scripts/gcc-goto.sh b/scripts/gcc-goto.sh
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index 8b980fb22..d256a9438 100755
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--- a/scripts/gcc-goto.sh
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+++ b/scripts/gcc-goto.sh
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@@ -3,7 +3,7 @@
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# Test for gcc 'asm goto' support
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# Copyright (C) 2010, Jason Baron <jbaron@redhat.com>
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-cat << "END" | $@ -x c - -fno-PIE -c -o /dev/null
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+cat << "END" > ./input
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int main(void)
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{
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#if defined(__arm__) || defined(__aarch64__)
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@@ -20,3 +20,6 @@ entry:
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return 0;
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}
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END
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+
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+$@ -x c ./input -fno-PIE -c -o ./output
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+rm ./input ./output
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--
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2.19.1
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