changeset c0302ad57921 in /z/repo/gem5
details: http://repo.gem5.org/gem5?cmd=changeset;node=c0302ad57921
description:
scons: Add Undefined Behavior Sanitizer (UBSan) option
This patch adds the Undefined Behavior Sanitizer (UBSan) for clang and
gcc >= 4.9. Due to the performance impact, the usage is guarded by a
command-line option.
diffstat:
SConstruct | 11 +++++++++++
src/SConscript | 15 +++++++++++++++
2 files changed, 26 insertions(+), 0 deletions(-)
diffs (60 lines):
diff -r 1e2cf7b3e9d4 -r c0302ad57921 SConstruct
--- a/SConstruct Mon Sep 22 14:37:23 2014 -0500
+++ b/SConstruct Thu Oct 16 05:49:36 2014 -0400
@@ -189,6 +189,8 @@
AddLocalOption('--without-tcmalloc', dest='without_tcmalloc',
action='store_true',
help='Disable linking against tcmalloc')
+AddLocalOption('--with-ubsan', dest='with_ubsan', action='store_true',
+ help='Build with Undefined Behavior Sanitizer if available')
termcap = get_termcap(GetOption('use_colors'))
@@ -602,6 +604,15 @@
'binutils to 2.23.' + \
termcap.Normal
+ # Make sure we warn if the user has requested to compile with the
+ # Undefined Benahvior Sanitizer and this version of gcc does not
+ # support it.
+ if GetOption('with_ubsan') and \
+ compareVersions(gcc_version, '4.9') < 0:
+ print termcap.Yellow + termcap.Bold + \
+ 'Warning: UBSan is only supported using gcc 4.9 and later.' + \
+ termcap.Normal
+
# Add the appropriate Link-Time Optimization (LTO) flags
# unless LTO is explicitly turned off. Note that these flags
# are only used by the fast target.
diff -r 1e2cf7b3e9d4 -r c0302ad57921 src/SConscript
--- a/src/SConscript Mon Sep 22 14:37:23 2014 -0500
+++ b/src/SConscript Thu Oct 16 05:49:36 2014 -0400
@@ -953,6 +953,15 @@
if compareVersions(env['GCC_VERSION'], '4.7') >= 0:
new_env.Append(CXXFLAGS='-Wdelete-non-virtual-dtor')
swig_env.Append(CCFLAGS='-Wno-maybe-uninitialized')
+
+ # Only gcc >= 4.9 supports UBSan, so check both the version
+ # and the command-line option before adding the compiler and
+ # linker flags.
+ if GetOption('with_ubsan') and \
+ compareVersions(env['GCC_VERSION'], '4.9') >= 0:
+ new_env.Append(CCFLAGS='-fsanitize=undefined')
+ new_env.Append(LINKFLAGS='-fsanitize=undefined')
+
if env['CLANG']:
# Always enable the warning for deletion of derived classes
# with non-virtual destructors
@@ -966,6 +975,12 @@
'-Wno-deprecated-register',
])
+ # All supported clang versions have support for UBSan, so if
+ # asked to use it, append the compiler and linker flags.
+ if GetOption('with_ubsan'):
+ new_env.Append(CCFLAGS='-fsanitize=undefined')
+ new_env.Append(LINKFLAGS='-fsanitize=undefined')
+
werror_env = new_env.Clone()
werror_env.Append(CCFLAGS='-Werror')
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