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authorDarren Tucker <dtucker@dtucker.net>2018-10-16 14:45:57 +1100
committerDarren Tucker <dtucker@dtucker.net>2018-10-16 14:45:57 +1100
commit1673274aee67ce0eb6f00578b6f3d2bcbd58f937 (patch)
tree2e893928cc16cdc5b8fdb58034416ef751307bf9 /configure.ac
parent4e23deefd7959ef83c73ed9cce574423438f6133 (diff)
Remove gcc spectre mitigation flags.
Current impementions of the gcc spectre mitigation flags cause miscompilations when combined with other flags and do not provide much protection. Found by fweimer at redhat.com, ok djm@
Diffstat (limited to 'configure.ac')
-rw-r--r--configure.ac9
1 files changed, 0 insertions, 9 deletions
diff --git a/configure.ac b/configure.ac
index 9dacccb2d..099ecdaa9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -164,15 +164,6 @@ if test "$GCC" = "yes" || test "$GCC" = "egcs"; then
164 OSSH_CHECK_CFLAG_COMPILE([-Wunused-result], [-Wno-unused-result]) 164 OSSH_CHECK_CFLAG_COMPILE([-Wunused-result], [-Wno-unused-result])
165 OSSH_CHECK_CFLAG_COMPILE([-fno-strict-aliasing]) 165 OSSH_CHECK_CFLAG_COMPILE([-fno-strict-aliasing])
166 if test "x$use_toolchain_hardening" = "x1"; then 166 if test "x$use_toolchain_hardening" = "x1"; then
167 # Cygwin GCC 7.x allows thunking on the CLI, but produces non-working
168 # code. Unfortunately you only notice this at link time.
169 case "$host" in
170 *-*-cygwin*) ;;
171 *)
172 OSSH_CHECK_CFLAG_COMPILE([-mfunction-return=thunk]) # gcc
173 OSSH_CHECK_CFLAG_COMPILE([-mindirect-branch=thunk]) # gcc
174 ;;
175 esac
176 OSSH_CHECK_CFLAG_COMPILE([-mretpoline]) # clang 167 OSSH_CHECK_CFLAG_COMPILE([-mretpoline]) # clang
177 OSSH_CHECK_LDFLAG_LINK([-Wl,-z,retpolineplt]) 168 OSSH_CHECK_LDFLAG_LINK([-Wl,-z,retpolineplt])
178 OSSH_CHECK_CFLAG_COMPILE([-D_FORTIFY_SOURCE=2]) 169 OSSH_CHECK_CFLAG_COMPILE([-D_FORTIFY_SOURCE=2])