+# Check if we have assembler support for unwind directives.
+gcc_GAS_CHECK_FEATURE([cfi directives], gcc_cv_as_cfi_directive,
+ ,,
+[ .text
+ .cfi_startproc
+ .cfi_offset 0, 0
+ .cfi_same_value 1
+ .cfi_def_cfa 1, 2
+ .cfi_escape 1, 2, 3, 4, 5
+ .cfi_endproc],
+[case "$target" in
+ *-*-solaris*)
+ # If the linker used on Solaris (like Sun ld) isn't capable of merging
+ # read-only and read-write sections, we need to make sure that the
+ # assembler used emits read-write .eh_frame sections.
+ if test "x$gcc_cv_ld_ro_rw_mix" != xread-write; then
+ if test "x$gcc_cv_objdump" != x; then
+ if $gcc_cv_objdump -h conftest.o 2>/dev/null | \
+ sed -e /.eh_frame/!d -e N | grep READONLY > /dev/null; then
+ gcc_cv_as_cfi_directive=no
+ else
+ case "$target" in
+ i?86-*-solaris2.1[[0-9]]*)
+ # On Solaris/x86, make sure that GCC and gas agree on using
+ # read-only .eh_frame sections for 64-bit.
+ if $gcc_cv_as --64 -o conftest.o conftest.s > /dev/null 2>&1 && \
+ $gcc_cv_objdump -h conftest.o 2>/dev/null | \
+ sed -e /.eh_frame/!d -e N | \
+ grep READONLY > /dev/null; then
+ gcc_cv_as_cfi_directive=yes
+ else
+ gcc_cv_as_cfi_directive=no
+ fi
+ ;;
+ *)
+ gcc_cv_as_cfi_directive=yes
+ ;;
+ esac
+ fi
+ else
+ # no objdump, err on the side of caution
+ gcc_cv_as_cfi_directive=no
+ fi
+ else
+ gcc_cv_as_cfi_directive=yes
+ fi
+ ;;
+ *-*-*)
+ gcc_cv_as_cfi_directive=yes
+ ;;
+esac])
+if test $gcc_cv_as_cfi_directive = yes && test x$gcc_cv_readelf != x; then
+gcc_GAS_CHECK_FEATURE([working cfi advance], gcc_cv_as_cfi_advance_working,
+ ,,
+[ .text
+ .cfi_startproc
+ .cfi_adjust_cfa_offset 64
+ .skip 75040, 0
+ .cfi_adjust_cfa_offset 128
+ .cfi_endproc],
+[[
+if $gcc_cv_readelf -wf conftest.o 2>/dev/null \
+ | grep 'DW_CFA_advance_loc[24]:[ ][ ]*75040[ ]' >/dev/null; then
+ gcc_cv_as_cfi_advance_working=yes
+fi
+]])
+else
+ # no readelf, err on the side of caution
+ gcc_cv_as_cfi_advance_working=no
+fi
+AC_DEFINE_UNQUOTED(HAVE_GAS_CFI_DIRECTIVE,
+ [`if test $gcc_cv_as_cfi_directive = yes \
+ && test $gcc_cv_as_cfi_advance_working = yes; then echo 1; else echo 0; fi`],
+ [Define 0/1 if your assembler supports CFI directives.])
+
+gcc_GAS_CHECK_FEATURE([cfi personality directive],
+ gcc_cv_as_cfi_personality_directive, ,,
+[ .text
+ .cfi_startproc
+ .cfi_personality 0, symbol
+ .cfi_endproc])
+AC_DEFINE_UNQUOTED(HAVE_GAS_CFI_PERSONALITY_DIRECTIVE,
+ [`if test $gcc_cv_as_cfi_personality_directive = yes;
+ then echo 1; else echo 0; fi`],
+ [Define 0/1 if your assembler supports .cfi_personality.])
+
+gcc_GAS_CHECK_FEATURE([cfi sections directive],
+ gcc_cv_as_cfi_sections_directive, ,,
+[ .text
+ .cfi_sections .debug_frame, .eh_frame
+ .cfi_startproc
+ .cfi_endproc])
+AC_DEFINE_UNQUOTED(HAVE_GAS_CFI_SECTIONS_DIRECTIVE,
+ [`if test $gcc_cv_as_cfi_sections_directive = yes;
+ then echo 1; else echo 0; fi`],
+ [Define 0/1 if your assembler supports .cfi_sections.])
+