This bug was fixed in the package gcc-7 - 7.3.0-30ubuntu1
---------------
gcc-7 (7.3.0-30ubuntu1) disco; urgency=medium
* Backport the libstdc++ mersenne twister optimization for AArch64, so that
the random header is the same on all architectures (Ubuntu only).
LP: #1799955.
gcc-7 (7.3.0-30) unstable; urgency=medium
* Update to SVN 20181030 (r265622) from the gcc-7-branch.
- Fix PR middle-end/86542, PR middle-end/86539, PR middle-end/86660,
PR libstdc++/87749, PR libstdc++/87704, PR libstdc++/79433,
PR libstdc++/87641, PR libstdc++/86751, PR libstdc++/78595,
PR libstdc++/87061, PR libstdc++/70966, PR libstdc++/77854,
PR libstdc++/87538, PR tree-optimization/87473, PR middle-end/87623,
PR target/87511 (AArch64), PR target/87550 (x86), PR middle-end/87248,
PR rtl-optimization/87065, PR middle-end/86627, PR middle-end/86542,
PR middle-end/86539, PR middle-end/86660, PR middle-end/87024,
PR middle-end/86505, PR target/87370 (x86), PR target/87517 (x86),
PR target/87522 (x86), PR other/87353, PR target/87467 (x86),
PR target/87033 (PPC), PR debug/86687, PR c++/3698, PR c++/86208,
PR fortran/86421.
* Don't configure native builds with --with-sysroot. Apparently this cannot
be completely overridden with the command line option --sysroot.
* Update VCS attributes in the control file.
gcc-7 (7.3.0-29) unstable; urgency=medium
* Update to SVN 20180904 (r264075) from the gcc-7-branch.
- Fix PR sanitizer/86022, PR tree-optimization/85859, PR target/86662,
PR target/87014 (x86), PR c++/86763.
-- Matthias Klose <d...@ubuntu.com> Tue, 04 Sep 2018 17:28:42 +0200
** Changed in: gcc-7 (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1799955
Title:
Cannot install multiarch libstdc++-7-dev:armhf and
libstdc++-7-dev:amd64 on Ubuntu 18.04
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