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83 lines
2.2 KiB
Diff
83 lines
2.2 KiB
Diff
From 9f917f7b411c307c34eb1bae85d72ffe26167523 Mon Sep 17 00:00:00 2001
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From: Florian Weimer <fweimer@redhat.com>
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Date: Tue, 3 Dec 2019 21:11:32 +0100
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Subject: [PATCH] x86: Assume --enable-cet if GCC defaults to CET [BZ #25225]
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This links in CET support if GCC defaults to CET. Otherwise, __CET__
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is defined, yet CET functionality is not compiled and linked into the
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dynamic loader, resulting in a linker failure due to undefined
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references to _dl_cet_check and _dl_open_check.
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(cherry picked from commit 9fb8139079ef0bb1aa33a4ae418cbb113b9b9da7)
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---
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NEWS | 1 +
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configure | 23 ++++++++++++++++++++++-
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configure.ac | 9 ++++++++-
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3 files changed, 31 insertions(+), 2 deletions(-)
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diff --git a/configure b/configure
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index fde57d63fe..c02753c0fe 100755
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--- a/configure
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+++ b/configure
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@@ -3762,11 +3762,32 @@ else
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fi
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+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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+/* end confdefs.h. */
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+
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+int
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+main ()
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+{
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+
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+#ifndef __CET__
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+#error no CET compiler support
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+#endif
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+ ;
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+ return 0;
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+}
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+_ACEOF
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+if ac_fn_c_try_compile "$LINENO"; then :
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+ libc_cv_compiler_default_cet=yes
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+else
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+ libc_cv_compiler_default_cet=no
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+fi
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+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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+
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# Check whether --enable-cet was given.
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if test "${enable_cet+set}" = set; then :
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enableval=$enable_cet; enable_cet=$enableval
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else
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- enable_cet=no
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+ enable_cet=$libc_cv_compiler_default_cet
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fi
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diff --git a/configure.ac b/configure.ac
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index 014e09a5d5..139554b94a 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -464,11 +464,18 @@ AC_ARG_ENABLE([mathvec],
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[build_mathvec=$enableval],
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[build_mathvec=notset])
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+AC_TRY_COMPILE([], [
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+#ifndef __CET__
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+# error no CET compiler support
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+#endif],
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+ [libc_cv_compiler_default_cet=yes],
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+ [libc_cv_compiler_default_cet=no])
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+
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AC_ARG_ENABLE([cet],
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AC_HELP_STRING([--enable-cet],
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[enable Intel Control-flow Enforcement Technology (CET), x86 only]),
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[enable_cet=$enableval],
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- [enable_cet=no])
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+ [enable_cet=$libc_cv_compiler_default_cet])
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# We keep the original values in `$config_*' and never modify them, so we
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# can write them unchanged into config.make. Everything else uses
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--
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2.20.1
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