diff options
-rwxr-xr-x | configure | 22 |
1 files changed, 20 insertions, 2 deletions
@@ -4957,16 +4957,34 @@ elif enabled gcc; then check_cflags -Werror=format-security check_cflags -fdiagnostics-color=auto enabled extra_warnings || check_disable_warning -Wno-maybe-uninitialized + if enabled x86_32; then + case $target_os in + *bsd*) + # BSDs don't guarantee a 16 byte aligned stack, but we can + # request GCC to try to maintain 16 byte alignment throughout + # function calls. Library entry points that might call assembly + # functions align the stack. (The parameter means 2^4 bytes.) + check_cflags -mpreferred-stack-boundary=4 + ;; + esac + fi elif enabled llvm_gcc; then check_cflags -mllvm -stack-alignment=16 elif enabled clang; then - if [ "$target_os" = "mingw32" -o "$target_os" = "win32" ] && enabled x86_32; then + if enabled x86_32; then # Clang doesn't support maintaining alignment without assuming the # same alignment in every function. If 16 byte alignment would be # enabled, one would also have to either add attribute_align_arg on # every single entry point into the libraries or enable -mstackrealign # (doing stack realignment in every single function). - disable aligned_stack + case $target_os in + mingw32|win32|*bsd*) + disable aligned_stack + ;; + *) + check_cflags -mllvm -stack-alignment=16 + ;; + esac else check_cflags -mllvm -stack-alignment=16 fi |