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From: "malat at debian dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/106187] armhf: Miscompilation at O2 level (O0 / O1 are
 working)
Date: Fri, 08 Jul 2022 14:18:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106187

--- Comment #18 from Mathieu Malaterre <malat at debian dot org> ---
The complete line to generate the *.ii file is:

```
% /usr/bin/g++ -DHWY_STATIC_DEFINE -I/home/malat/highway -O2 -fstrict-alias=
ing
-ggdb3 -fPIE -fvisibility=3Dhidden -fvisibility-inlines-hidden
-Wno-builtin-macro-redefined -D__DATE__=3D\"redacted\"
-D__TIMESTAMP__=3D\"redacted\" -D__TIME__=3D\"redacted\" -fmerge-all-consta=
nts
-Wall -Wextra -Wconversion -Wsign-conversion -Wvla -Wnon-virtual-dtor
-fmath-errno -fno-exceptions -DHWY_IS_TEST=3D1 -DGTEST_HAS_PTHREAD=3D1 -MD =
-MT
CMakeFiles/mul_test.dir/hwy/tests/mul_test.cc.o -MF
CMakeFiles/mul_test.dir/hwy/tests/mul_test.cc.o.d -o
CMakeFiles/mul_test.dir/hwy/tests/mul_test.cc.o -save-temps -c
/home/malat/highway/hwy/tests/mul_test.cc
```

Where the important cmake setup is:

```
CMAKE_BUILD_TYPE:STRING=3DNone
CMAKE_CXX_FLAGS:STRING=3D-O2 -fstrict-aliasing -ggdb3
```=