https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119977
--- Comment #7 from Sam James <sjames at gcc dot gnu.org> ---
OK, if I run:
```
/home/sam/build/gcc-after/./stage2-gcc/xg++
-B/home/sam/build/gcc-after/./stage2-gcc/
-B/home/sam/prefix/gcc-after/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-B/home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-fno-PIE -c -O2 -pipe -march=znver4 -ggdb3 -fno-checking -fcf-protection
-flto=jobserver -frandom-seed=1 -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-error=narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -Wconditionally-supported
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -fno-PIE gimple-match-6-stage2.ii -o b -fchecking=1
```
and
```
/home/sam/build/gcc-after/./stage2-gcc/xg++
-B/home/sam/build/gcc-after/./stage2-gcc/
-B/home/sam/prefix/gcc-after/x86_64-pc-linux-gnu/bin/ -nostdinc++
-B/home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/src/.libs
-B/home/sam/build/gcc-after/stage2-x86_64-pc-linux-gnu/libstdc++-v3/libsupc++/.libs
-fno-PIE -c -O2 -pipe -march=znver4 -ggdb3 -fno-checking -fcf-protection
-flto=jobserver -frandom-seed=1 -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-error=narrowing -Wwrite-strings
-Wcast-qual -Wmissing-format-attribute -Wconditionally-supported
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -fno-PIE gimple-match-6-stage2.ii -o b -fchecking=1
```
then
```
~/git/gcc/contrib/compare-lto -p a b
```
I get:
```
$ git diff --no-index --word-diff
<(/home/sam/build/gcc-after/stage2-gcc/lto-dump -demangle -list a.stripped
-objects) <(/home/sam/build/gcc-after/stage2-gcc/lto-dump -demangle -list
b.stripped -objects)
--- a/dev/fd/63
+++ b/dev/fd/62
@@ -1,240 +1,240 @@
LTO Object Name: [-a.stripped-]{+b.stripped+}
No. Offset Size Section Name
1 [-663832 211714-]{+663837 211715+} .gnu.lto_.odr_types.1
2 [-875546-]{+875552+} 122 .gnu.lto_.profile.1
3 [-875668-]{+875674+} 8147 .gnu.lto_.icf.1
4 [-883815-]{+883821+} 6179 .gnu.lto_.ipa_sra.1
5 [-889994-]{+890000+} 18958 .gnu.lto_.inline.1
6 [-908952-]{+908958+} 19955 .gnu.lto_.jmpfuncs.1
7 [-928907-]{+928913+} 559 .gnu.lto_.pureconst.1
8 [-929466-]{+929472+} 3301 .gnu.lto_.ipa_modref.1
9 [-932767-]{+932773+} 8 .gnu.lto_.lto.1
10 [-932775 553-]{+932781 555+}
.gnu.lto__ZN16wide_int_storageC2ERKS_.0.1
11 [-933328 862-]{+933336 863+}
.gnu.lto__ZN16wide_int_storageaSERKS_.2.1
12 [-934190-]{+934199+} 820
.gnu.lto__ZN16wide_int_storage6createEj.3.1
[...]
``
so, I'll cvise based on that and pray?
