+AC_MSG_CHECKING(assembler eh_frame optimization)
+gcc_cv_as_eh_frame=no
+if test x$gcc_cv_gas_major_version != x -a x$gcc_cv_gas_minor_version != x; then
+ if test "$gcc_cv_gas_major_version" -eq 2 -a "$gcc_cv_gas_minor_version" -ge 12 -o "$gcc_cv_gas_major_version" -gt 2 && grep 'obj_format = elf' ../gas/Makefile > /dev/null; then
+ gcc_cv_as_eh_frame="yes"
+ fi
+elif test x$gcc_cv_as != x; then
+ # Check if this is GAS.
+ as_ver=`$gcc_cv_as --version < /dev/null 2> /dev/null | head -1`
+ rm -f a.out 2> /dev/null
+ if echo "$as_ver" | grep GNU > /dev/null; then
+ # Versions up to and including 2.11.0 may mis-optimize
+ # .eh_frame data. Try something.
+ cat > conftest.s <<EOF
+ .text
+.LFB1:
+ .4byte 0
+.L1:
+ .4byte 0
+.LFE1:
+ .section .eh_frame,"aw",@progbits
+__FRAME_BEGIN__:
+ .4byte .LECIE1-.LSCIE1
+.LSCIE1:
+ .4byte 0x0
+ .byte 0x1
+ .ascii "z\0"
+ .byte 0x1
+ .byte 0x78
+ .byte 0x1a
+ .byte 0x0
+ .byte 0x4
+ .4byte 1
+ .p2align 1
+.LECIE1:
+.LSFDE1:
+ .4byte .LEFDE1-.LASFDE1
+.LASFDE1:
+ .4byte .LASFDE1-__FRAME_BEGIN__
+ .4byte .LFB1
+ .4byte .LFE1-.LFB1
+ .byte 0x4
+ .4byte .LFE1-.LFB1
+ .byte 0x4
+ .4byte .L1-.LFB1
+.LEFDE1:
+EOF
+ cat > conftest.lit <<EOF
+ 0000 10000000 00000000 017a0001 781a0004 .........z..x...
+ 0010 01000000 12000000 18000000 00000000 ................
+ 0020 08000000 04080000 0044 .........D
+EOF
+ cat > conftest.big <<EOF
+ 0000 00000010 00000000 017a0001 781a0004 .........z..x...
+ 0010 00000001 00000012 00000018 00000000 ................
+ 0020 00000008 04000000 0844 .........D
+EOF
+ # If the assembler didn't choke, and we can objdump,
+ # and we got the correct data, then succeed.
+ if $gcc_cv_as -o conftest.o conftest.s > /dev/null 2>&1 \
+ && objdump -s -j .eh_frame conftest.o 2>/dev/null \
+ | tail -3 > conftest.got \
+ && { cmp conftest.lit conftest.got > /dev/null 2>&1 \
+ || cmp conftest.big conftest.got > /dev/null 2>&1; }
+ then
+ gcc_cv_as_eh_frame="yes"
+ else
+ gcc_cv_as_eh_frame="bad"
+ if $gcc_cv_as -o conftest.o --traditional-format /dev/null; then
+ AC_DEFINE(USE_AS_TRADITIONAL_FORMAT, 1,
+ [Define if your assembler mis-optimizes .eh_frame data.])
+ fi
+ fi
+ fi
+ rm -f conftest.*
+fi
+AC_MSG_RESULT($gcc_cv_as_eh_frame)
+