Comment 11 for bug 1895358

Verified 2.31-0ubuntu9.2 on Focal:

root@ff-icc:~# /opt/intel/oneapi/compiler/2021.1.2/linux/bin/intel64/icc -c test.c
In file included from /opt/intel/oneapi/compiler/2021.1.2/linux/bin/intel64/../../compiler/include/icc/tgmath.h(25),
                 from test.c(1):
/usr/include/tgmath.h(54): error: #error directive: "Unsupported combination of types for <tgmath.h>."
  # error "Unsupported combination of types for <tgmath.h>."
     ^

compilation aborted for test.c (code 2)
root@ff-icc:~# dpkg -l libc6-dev
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===============-===============-============-=====================================================
ii libc6-dev:amd64 2.31-0ubuntu9.1 amd64 GNU C Library: Development Libraries and Header Files
root@ff-icc:~# sed -i s/backports/proposed/ /etc/apt/sources.list
root@ff-icc:~# apt update
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Hit:2 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Get:3 http://archive.ubuntu.com/ubuntu focal-proposed InRelease [267 kB]
Hit:4 http://security.ubuntu.com/ubuntu focal-security InRelease
Get:5 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 Packages [213 kB]
Hit:6 https://apt.repos.intel.com/oneapi all InRelease
Get:7 http://archive.ubuntu.com/ubuntu focal-proposed/main Translation-en [51.6 kB]
Get:8 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 c-n-f Metadata [2524 B]
Get:9 http://archive.ubuntu.com/ubuntu focal-proposed/restricted amd64 Packages [36.5 kB]
Get:10 http://archive.ubuntu.com/ubuntu focal-proposed/restricted Translation-en [5460 B]
Get:11 http://archive.ubuntu.com/ubuntu focal-proposed/restricted amd64 c-n-f Metadata [116 B]
Get:12 http://archive.ubuntu.com/ubuntu focal-proposed/universe amd64 Packages [51.9 kB]
Get:13 http://archive.ubuntu.com/ubuntu focal-proposed/universe Translation-en [24.3 kB]
Get:14 http://archive.ubuntu.com/ubuntu focal-proposed/universe amd64 c-n-f Metadata [1612 B]
Get:15 http://archive.ubuntu.com/ubuntu focal-proposed/multiverse amd64 Packages [704 B]
Get:16 http://archive.ubuntu.com/ubuntu focal-proposed/multiverse Translation-en [3752 B]
Get:17 http://archive.ubuntu.com/ubuntu focal-proposed/multiverse amd64 c-n-f Metadata [192 B]
Fetched 658 kB in 1s (831 kB/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
25 packages can be upgraded. Run 'apt list --upgradable' to see them.
root@ff-icc:~# apt install libc6-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libfreetype6 libpciaccess0
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
  libc-dev-bin libc6
Suggested packages:
  glibc-doc
The following packages will be upgraded:
  libc-dev-bin libc6 libc6-dev
3 upgraded, 0 newly installed, 0 to remove and 22 not upgraded.
Need to get 5306 kB of archives.
After this operation, 6144 B of additional disk space will be used.
Do you want to continue? [Y/n]
Get:1 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 libc6-dev amd64 2.31-0ubuntu9.2 [2520 kB]
Get:2 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 libc-dev-bin amd64 2.31-0ubuntu9.2 [71.8 kB]
Get:3 http://archive.ubuntu.com/ubuntu focal-proposed/main amd64 libc6 amd64 2.31-0ubuntu9.2 [2715 kB]
Fetched 5306 kB in 1s (4268 kB/s)
Preconfiguring packages ...
(Reading database ... 49023 files and directories currently installed.)
Preparing to unpack .../libc6-dev_2.31-0ubuntu9.2_amd64.deb ...
Unpacking libc6-dev:amd64 (2.31-0ubuntu9.2) over (2.31-0ubuntu9.1) ...
Preparing to unpack .../libc-dev-bin_2.31-0ubuntu9.2_amd64.deb ...
Unpacking libc-dev-bin (2.31-0ubuntu9.2) over (2.31-0ubuntu9.1) ...
Preparing to unpack .../libc6_2.31-0ubuntu9.2_amd64.deb ...
Unpacking libc6:amd64 (2.31-0ubuntu9.2) over (2.31-0ubuntu9.1) ...
Setting up libc6:amd64 (2.31-0ubuntu9.2) ...
Setting up libc-dev-bin (2.31-0ubuntu9.2) ...
Setting up libc6-dev:amd64 (2.31-0ubuntu9.2) ...
Processing triggers for man-db (2.9.1-1) ...
Processing triggers for libc-bin (2.31-0ubuntu9.1) ...
root@ff-icc:~# /opt/intel/oneapi/compiler/2021.1.2/linux/bin/intel64/icc -c test.c
root@ff-icc:~# dpkg -l libc6-dev
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-===============-===============-============-=====================================================
ii libc6-dev:amd64 2.31-0ubuntu9.2 amd64 GNU C Library: Development Libraries and Header Files
root@ff-icc:~# cat test.c
#include <tgmath.h>