mirror of
https://github.com/crosstool-ng/crosstool-ng.git
synced 2024-12-22 14:12:26 +00:00
83 lines
2.2 KiB
Diff
83 lines
2.2 KiB
Diff
From 0b4c3e1e0b8656149d4556d2f81a2958426ebc94 Mon Sep 17 00:00:00 2001
|
|
From: Florian Weimer <fweimer@redhat.com>
|
|
Date: Tue, 3 Dec 2019 21:08:49 +0100
|
|
Subject: [PATCH] x86: Assume --enable-cet if GCC defaults to CET [BZ #25225]
|
|
|
|
This links in CET support if GCC defaults to CET. Otherwise, __CET__
|
|
is defined, yet CET functionality is not compiled and linked into the
|
|
dynamic loader, resulting in a linker failure due to undefined
|
|
references to _dl_cet_check and _dl_open_check.
|
|
|
|
(cherry picked from commit 9fb8139079ef0bb1aa33a4ae418cbb113b9b9da7)
|
|
---
|
|
NEWS | 1 +
|
|
configure | 23 ++++++++++++++++++++++-
|
|
configure.ac | 9 ++++++++-
|
|
3 files changed, 31 insertions(+), 2 deletions(-)
|
|
|
|
diff --git a/configure b/configure
|
|
index 101dfddf37..6a2df7c2be 100755
|
|
--- a/configure
|
|
+++ b/configure
|
|
@@ -3777,11 +3777,32 @@ else
|
|
fi
|
|
|
|
|
|
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
|
|
+/* end confdefs.h. */
|
|
+
|
|
+int
|
|
+main ()
|
|
+{
|
|
+
|
|
+#ifndef __CET__
|
|
+#error no CET compiler support
|
|
+#endif
|
|
+ ;
|
|
+ return 0;
|
|
+}
|
|
+_ACEOF
|
|
+if ac_fn_c_try_compile "$LINENO"; then :
|
|
+ libc_cv_compiler_default_cet=yes
|
|
+else
|
|
+ libc_cv_compiler_default_cet=no
|
|
+fi
|
|
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
|
|
+
|
|
# Check whether --enable-cet was given.
|
|
if test "${enable_cet+set}" = set; then :
|
|
enableval=$enable_cet; enable_cet=$enableval
|
|
else
|
|
- enable_cet=no
|
|
+ enable_cet=$libc_cv_compiler_default_cet
|
|
fi
|
|
|
|
|
|
diff --git a/configure.ac b/configure.ac
|
|
index 46a74687a6..f483afdc2e 100644
|
|
--- a/configure.ac
|
|
+++ b/configure.ac
|
|
@@ -472,11 +472,18 @@ AC_ARG_ENABLE([mathvec],
|
|
[build_mathvec=$enableval],
|
|
[build_mathvec=notset])
|
|
|
|
+AC_TRY_COMPILE([], [
|
|
+#ifndef __CET__
|
|
+# error no CET compiler support
|
|
+#endif],
|
|
+ [libc_cv_compiler_default_cet=yes],
|
|
+ [libc_cv_compiler_default_cet=no])
|
|
+
|
|
AC_ARG_ENABLE([cet],
|
|
AC_HELP_STRING([--enable-cet],
|
|
[enable Intel Control-flow Enforcement Technology (CET), x86 only]),
|
|
[enable_cet=$enableval],
|
|
- [enable_cet=no])
|
|
+ [enable_cet=$libc_cv_compiler_default_cet])
|
|
|
|
# We keep the original values in `$config_*' and never modify them, so we
|
|
# can write them unchanged into config.make. Everything else uses
|
|
--
|
|
2.20.1
|
|
|