[Bug 2081618] [NEW] clang++ can't find standard headers

[brandon s allbery kf8nh]

Public bug reported:

clang++-18 -O2 -std=c++11 -g -Wall -Wextra -Wno-parentheses -Wno-unused-parameter -I/usr/include/libpng16  -DUSE_TILE -MMD -c tool/tile_colour.cc -o tool/tile_colour.o
tool/tile_colour.cc:2:10: fatal error: 'cassert' file not found
#include <cassert>
         ^~~~~~~~~
1 error generated.

The compile succeeds if I use g++; it fails with the above error if I
use clang++-15 or clang++-18.

The program I am building is DCSS, https://github.com/crawl/crawl; it
fails on the first C++ file to be compiled, which is in the rltiles
subdirectory of crawl-ref/source. The full build command is "make debug
WEBTILES=y FULLDEBUG=y LTO=y FORCE_CC=clang-18 FORCE_CXX=clang++-18
V=1".

clang++-15 worked to build it on 22.04.3, with no additional C++-related
packages needed once g++ and clang-15 were installed. (Some other
dependencies are also needed to build it, as described in INSTALL.md,
but those won't impact standard headers such as "<cassert>".)

Searching for this failure found reports for older Ubuntu versions which
suggested installing (older versions of) various packages that are
installed already.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: clang-18 1:18.1.3-1ubuntu1
ProcVersionSignature: Ubuntu 6.1.0-1025.25-oem 6.1.57
Uname: Linux 6.1.0-1025-oem x86_64
ApportVersion: 2.28.1-0ubuntu3.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: MATE
Date: Sun Sep 22 00:16:47 2024
InstallationDate: Installed on 2023-11-15 (311 days ago)
InstallationMedia: Ubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.2)
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/zsh
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
SourcePackage: llvm-toolchain-18
UpgradeStatus: Upgraded to noble on 2024-09-22 (0 days ago)
mtime.conffile..etc.init.d.apport: 2024-07-22T10:59:07

** Affects: llvm-toolchain-18 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble

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https://bugs.launchpad.net/bugs/2081618

Title:
  clang++ can't find standard headers

Status in llvm-toolchain-18 package in Ubuntu:
  New

Bug description:
  clang++-18 -O2 -std=c++11 -g -Wall -Wextra -Wno-parentheses -Wno-unused-parameter -I/usr/include/libpng16  -DUSE_TILE -MMD -c tool/tile_colour.cc -o tool/tile_colour.o
  tool/tile_colour.cc:2:10: fatal error: 'cassert' file not found
  #include <cassert>
           ^~~~~~~~~
  1 error generated.

  The compile succeeds if I use g++; it fails with the above error if I
  use clang++-15 or clang++-18.

  The program I am building is DCSS, https://github.com/crawl/crawl; it
  fails on the first C++ file to be compiled, which is in the rltiles
  subdirectory of crawl-ref/source. The full build command is "make
  debug WEBTILES=y FULLDEBUG=y LTO=y FORCE_CC=clang-18
  FORCE_CXX=clang++-18 V=1".

  clang++-15 worked to build it on 22.04.3, with no additional
  C++-related packages needed once g++ and clang-15 were installed.
  (Some other dependencies are also needed to build it, as described in
  INSTALL.md, but those won't impact standard headers such as
  "<cassert>".)

  Searching for this failure found reports for older Ubuntu versions
  which suggested installing (older versions of) various packages that
  are installed already.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: clang-18 1:18.1.3-1ubuntu1
  ProcVersionSignature: Ubuntu 6.1.0-1025.25-oem 6.1.57
  Uname: Linux 6.1.0-1025-oem x86_64
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: MATE
  Date: Sun Sep 22 00:16:47 2024
  InstallationDate: Installed on 2023-11-15 (311 days ago)
  InstallationMedia: Ubuntu 22.04.3 LTS "Jammy Jellyfish" - Release amd64 (20230807.2)
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/zsh
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  SourcePackage: llvm-toolchain-18
  UpgradeStatus: Upgraded to noble on 2024-09-22 (0 days ago)
  mtime.conffile..etc.init.d.apport: 2024-07-22T10:59:07

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