2022-08-13 15:17:36 +00:00
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From 4baaeb9661fa4015d9701e3616ce1ad4e8a07fd8 Mon Sep 17 00:00:00 2001
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2021-09-01 00:15:14 +00:00
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From: =?UTF-8?q?S=C3=B6ren=20Tempel?= <soeren+git@soeren-tempel.net>
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Date: Sun, 29 Aug 2021 09:45:27 +0200
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Subject: [PATCH] configure: fix detection of atomic builtins in libatomic
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configure script
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Alpine's --enable-autolink-libatomic (which is enabled for riscv64 by
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default) causes the libatomic configure script to incorrectly detect
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which builtins are available on riscv64. This then causes incorrect code
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generation for libatomic since it assumes compiler builtins to be
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available which are not actually available on riscv64.
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This commit fixes this issue by disabling linking of libatomic configure
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test code entirely, thereby preventing linking against libatomic.
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See:
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* https://gitlab.alpinelinux.org/alpine/aports/-/issues/12948
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* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101996#c6
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---
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libatomic/configure.tgt | 20 ++++++++++++++++++++
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1 file changed, 20 insertions(+)
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diff --git a/libatomic/configure.tgt b/libatomic/configure.tgt
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2022-08-13 15:17:36 +00:00
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index 33f8c91ce77..3999db2cf8a 100644
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2021-09-01 00:15:14 +00:00
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--- a/libatomic/configure.tgt
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+++ b/libatomic/configure.tgt
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@@ -30,6 +30,26 @@
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# on ${target_cpu}. For example to allow proper use of multilibs.
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configure_tgt_pre_target_cpu_XCFLAGS="${XCFLAGS}"
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+# The libatomic configure script performs several checks to determine
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+# whether builtins for atomic operations are available. When compiling
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+# with --enable-autolink-libatomic the test code compiled by the
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+# configure script is also linked against libatomic. This causes it
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+# to think that builtins are available, even if there are not, since
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+# the tested symbols are provided by libatomic.
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+#
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+# This is a hack to ensure that we don't link against libatomic by not
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+# linking any configure test code at all when --enable-autolink-libatomic
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+# is given.
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+#
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+# See:
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+#
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+# * https://gitlab.alpinelinux.org/alpine/aports/-/issues/12817
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+# * https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101996#c4
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+#
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+if test x$enable_autolink_libatomic = xyes; then
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+ gcc_no_link=yes
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+fi
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+
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case "${target_cpu}" in
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alpha*)
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# fenv.c needs this option to generate inexact exceptions.
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