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Merge commit 'ea2f72a2c14c67a3b35dac6426d1e3c0fae33fd5'

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* commit 'ea2f72a2c14c67a3b35dac6426d1e3c0fae33fd5':
  configure: Don't assume a 16 byte aligned stack on BSDs on i386

Merged-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2018-03-29 20:40:07 -03:00
commit 23f4472944
1 changed files with 21 additions and 2 deletions
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23
configure vendored
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@ -6522,16 +6522,35 @@ elif enabled gcc; then
check_cflags -Wformat
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
check_cflags -mstack-alignment=16
;;
esac
else
check_cflags -mllvm -stack-alignment=16
check_cflags -mstack-alignment=16