[Bug ld/29226] gcc -fcf-protection option causes GCC 12 gccgo build to fail : "failed to match split-stack sequence"

[jason.vas.dias at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29226

--- Comment #5 from Jason Vas Dias <jason.vas.dias at gmail dot com> ---
OK, with binutils 's gold/ld-new and libbfd recompiled with the
above error statement in gold/x86_64.cc, we get:

/usr/local/bin/ld: Unlocking file
"/home/jvd/rpmbuild/BUILD/gcc-12.1.1-20220507/obj-x86_64-redhat-linux/./gcc/libgcc.a"
/usr/local/bin/ld: Closed descriptor 5 for
"/home/jvd/rpmbuild/BUILD/gcc-12.1.1-20220507/obj-x86_64-redhat-linux/./gcc/libgcc_eh.a"
/usr/local/bin/ld: Opened new descriptor 4 for "cgo"
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 540 r10:0 r11:0 115
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 660 r10:0 r11:0 93
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 7e0 r10:0 r11:0 204
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 8b0 r10:0 r11:0 191
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 970 r10:0 r11:0 177
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset a30 r10:0 r11:0 369
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset bb0 r10:0 r11:0 161
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset c60 r10:0 r11:0 118
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset ce0 r10:0 r11:0 132
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset d70 r10:0 r11:0 135
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset ec0 r10:0 r11:0 2625
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 1910 r10:0 r11:0 240
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 1a00 r10:0 r11:0 240
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 1af0 r10:0 r11:0 102
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 1c70 r10:0 r11:0 218
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 1d50 r10:0 r11:0 395
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 1ee0 r10:0 r11:0 277
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 2390 r10:0 r11:0 3519
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 3150 r10:0 r11:0 263
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 3260 r10:0 r11:0 204
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 3330 r10:0 r11:0 282
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 3450 r10:0 r11:0 296
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 3580 r10:0 r11:0 68
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 35d0 r10:0 r11:0 428
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 39f0 r10:0 r11:0 228
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 3b70 r10:0 r11:0 1496
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 4150 r10:0 r11:0 1421
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 4780 r10:0 r11:0 4649
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 59b0 r10:0 r11:0 304
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 5b90 r10:0 r11:0 1194
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 6040 r10:0 r11:0 469
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 6220 r10:0 r11:0 401
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 6480 r10:0 r11:0 1505
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 6a70 r10:0 r11:0 175
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 6b20 r10:0 r11:0 205
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 6bf0 r10:0 r11:0 4529
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 7db0 r10:0 r11:0 542
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 7fd0 r10:0 r11:0 344
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 8130 r10:0 r11:0 179
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 81f0 r10:0 r11:0 360
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 8360 r10:0 r11:0 1810
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 8a80 r10:0 r11:0 411
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 8c20 r10:0 r11:0 56
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 8c60 r10:0 r11:0 1838
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 938e r10:0 r11:0 68
/usr/local/bin/ld: error: /tmp/ccAgu0zM.o: failed to match split-stack sequence
at section 265 offset 93d2 r10:0 r11:0 68




So yes, it is neither an lea_r10_insn nor an lea_r10_insn, and fnsize appears
always to be > 8, so the logic there definitely needs improvement - 
lack masking out the register number in the instruction, so that
ANY 'lea' instruction would trigger insertion of correct code ?

I will try to get it to break there now and see if I can get it to print
what the instruction actually is, in
/home/jvd/rpmbuild/BUILD/gcc-12.1.1-20220507/obj-x86_64-redhat-linux/./gcc/libgcc_eh.a,
that is causing this issue.

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