brew test llvm is failing with linuxbrew install

[ipatch]

Additional Info

• I am using Windows Subsystem for Linux

Output of brew config

HOMEBREW_VERSION: 4.4.6-37-g3a5b17a
ORIGIN: https://github.com/Homebrew/brew
HEAD: 3a5b17a421fea58241efd9398349eb17c5e92277
Last commit: 10 hours ago
Core tap HEAD: 1d22df5539f22f3a10466284ef8bb6876b336417
Core tap last commit: 9 minutes ago
Core tap JSON: 22 Nov 01:41 UTC
HOMEBREW_PREFIX: /home/linuxbrew/.linuxbrew
HOMEBREW_CACHE: /home/linuxbrew/.linuxbrew/cache
HOMEBREW_CASK_OPTS: []
HOMEBREW_DEVELOPER: set
HOMEBREW_DISPLAY: localhost:10.0
HOMEBREW_EDITOR: nvim
HOMEBREW_MAKE_JOBS: 8
HOMEBREW_NO_ANALYTICS: set
HOMEBREW_NO_AUTOREMOVE: set
HOMEBREW_NO_AUTO_UPDATE: set
HOMEBREW_NO_GITHUB_API: set
HOMEBREW_NO_INSTALL_CLEANUP: set
HOMEBREW_NO_INSTALL_FROM_API: set
HOMEBREW_SORBET_RUNTIME: set
HOMEBREW_TEMP: /home/brewer/tmp/homebrew
Homebrew Ruby: 3.3.6 => /home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/3.3.6/bin/ruby
CPU: octa-core 64-bit haswell
Clang: 19.1.3
Git: 2.34.1 => /bin/git
Curl: 7.81.0 => /bin/curl
Kernel: Linux 6.8.0-49-generic x86_64 GNU/Linux
OS: Ubuntu 22.04.5 LTS (jammy)
Host glibc: 2.35
/usr/bin/gcc: 11.4.0
/usr/bin/ruby: 3.0.2
glibc: N/A
gcc@11: N/A
gcc: 14.2.0_1
xorg: N/A

Output of brew doctor

Your system is ready to brew.

Description of issue

brew test llvm

output

==> Testing llvm
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/llvm-config --prefix
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/llvm-config --libs
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/llvm-config --libfiles
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/clang-cpp -v test.c
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/clang-cpp -v test.cpp
Last 15 lines from /home/brewer/.cache/Homebrew/Logs/llvm/test.02.clang-cpp:
      |          ^~~~~~~~~~
# 1 "test.cpp"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 468 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "test.cpp" 2

int main()
{
  std::cout << "Hello World!" << std::endl;
  return 0;
}
1 error generated.
Error: llvm: failed
Warning: Removed Sorbet lines from backtrace!
Rerun with `--verbose` to see the original backtrace
An exception occurred within a child process:
  BuildError: Failed executing: /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/clang-cpp -v test.cpp
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:3141:in `block in system'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:3077:in `open'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:3077:in `system'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/l/llvm.rb:606:in `block in <class:Llvm>'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2874:in `block (3 levels) in run_test'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/extend/kernel.rb:539:in `with_env'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2873:in `block (2 levels) in run_test'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:1208:in `with_logging'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2872:in `block in run_test'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/mktemp.rb:90:in `block in run'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/mktemp.rb:90:in `chdir'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/mktemp.rb:90:in `run'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:3200:in `mktemp'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2866:in `run_test'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/test.rb:48:in `block in <main>'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/3.3.6/lib/ruby/3.3.0/timeout.rb:186:in `block in timeout'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/3.3.6/lib/ruby/3.3.0/timeout.rb:41:in `handle_timeout'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/3.3.6/lib/ruby/3.3.0/timeout.rb:195:in `timeout'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/test.rb:54:in `<main>'

---

brew test --verbose

/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/bin/bundle clean
==> Testing llvm
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/llvm-config --prefix
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/llvm-config --libs
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/llvm-config --libfiles
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/clang-cpp -v test.c
Homebrew clang version 19.1.3
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin
System configuration file directory: /home/linuxbrew/.linuxbrew/etc/clang
User configuration file directory: /home/brewer/tmp/homebrew/llvm-test-20241122-10685-mafssm/.config/clang
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Candidate multilib: .;@m64
Selected multilib: .;@m64
 (in-process)
 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/clang-19" -cc1 -triple x86_64-unknown-linux-gnu -E -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name test.c -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/brewer/tmp/homebrew/llvm-test-20241122-10685-mafssm -v -fcoverage-compilation-dir=/home/brewer/tmp/homebrew/llvm-test-20241122-10685-mafssm -resource-dir /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19 -I/home/linuxbrew/.linuxbrew/opt/llvm/include -I/home/linuxbrew/.linuxbrew/include -internal-isystem /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o - -x c test.c
clang -cc1 version 19.1.3 based upon LLVM 19.1.3 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/linuxbrew/.linuxbrew/opt/llvm/include
 /home/linuxbrew/.linuxbrew/include
 /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
# 1 "test.c"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 400 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "test.c" 2
# 1 "/usr/include/stdio.h" 1 3 4
# 27 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/libc-header-start.h" 1 3 4
# 33 "/usr/include/x86_64-linux-gnu/bits/libc-header-start.h" 3 4
# 1 "/usr/include/features.h" 1 3 4
# 392 "/usr/include/features.h" 3 4
# 1 "/usr/include/features-time64.h" 1 3 4
# 20 "/usr/include/features-time64.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 21 "/usr/include/features-time64.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/timesize.h" 1 3 4
# 19 "/usr/include/x86_64-linux-gnu/bits/timesize.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 20 "/usr/include/x86_64-linux-gnu/bits/timesize.h" 2 3 4
# 22 "/usr/include/features-time64.h" 2 3 4
# 393 "/usr/include/features.h" 2 3 4
# 464 "/usr/include/features.h" 3 4
# 1 "/usr/include/stdc-predef.h" 1 3 4
# 465 "/usr/include/features.h" 2 3 4
# 486 "/usr/include/features.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 1 3 4
# 559 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 560 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/long-double.h" 1 3 4
# 561 "/usr/include/x86_64-linux-gnu/sys/cdefs.h" 2 3 4
# 487 "/usr/include/features.h" 2 3 4
# 510 "/usr/include/features.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 1 3 4
# 10 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/gnu/stubs-64.h" 1 3 4
# 11 "/usr/include/x86_64-linux-gnu/gnu/stubs.h" 2 3 4
# 511 "/usr/include/features.h" 2 3 4
# 34 "/usr/include/x86_64-linux-gnu/bits/libc-header-start.h" 2 3 4
# 28 "/usr/include/stdio.h" 2 3 4





# 1 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/stddef.h" 1 3 4
# 93 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/stddef.h" 3 4
# 1 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/__stddef_size_t.h" 1 3 4
# 18 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/__stddef_size_t.h" 3 4
typedef long unsigned int size_t;
# 94 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/stddef.h" 2 3 4
# 108 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/stddef.h" 3 4
# 1 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/__stddef_null.h" 1 3 4
# 109 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/stddef.h" 2 3 4
# 34 "/usr/include/stdio.h" 2 3 4


# 1 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/stdarg.h" 1 3 4
# 51 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/stdarg.h" 3 4
# 1 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/__stdarg___gnuc_va_list.h" 1 3 4
# 12 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/__stdarg___gnuc_va_list.h" 3 4
typedef __builtin_va_list __gnuc_va_list;
# 52 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include/stdarg.h" 2 3 4
# 37 "/usr/include/stdio.h" 2 3 4

# 1 "/usr/include/x86_64-linux-gnu/bits/types.h" 1 3 4
# 27 "/usr/include/x86_64-linux-gnu/bits/types.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 28 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/timesize.h" 1 3 4
# 19 "/usr/include/x86_64-linux-gnu/bits/timesize.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/wordsize.h" 1 3 4
# 20 "/usr/include/x86_64-linux-gnu/bits/timesize.h" 2 3 4
# 29 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4


typedef unsigned char __u_char;
typedef unsigned short int __u_short;
typedef unsigned int __u_int;
typedef unsigned long int __u_long;


typedef signed char __int8_t;
typedef unsigned char __uint8_t;
typedef signed short int __int16_t;
typedef unsigned short int __uint16_t;
typedef signed int __int32_t;
typedef unsigned int __uint32_t;

typedef signed long int __int64_t;
typedef unsigned long int __uint64_t;






typedef __int8_t __int_least8_t;
typedef __uint8_t __uint_least8_t;
typedef __int16_t __int_least16_t;
typedef __uint16_t __uint_least16_t;
typedef __int32_t __int_least32_t;
typedef __uint32_t __uint_least32_t;
typedef __int64_t __int_least64_t;
typedef __uint64_t __uint_least64_t;



typedef long int __quad_t;
typedef unsigned long int __u_quad_t;







typedef long int __intmax_t;
typedef unsigned long int __uintmax_t;
# 141 "/usr/include/x86_64-linux-gnu/bits/types.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/typesizes.h" 1 3 4
# 142 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/time64.h" 1 3 4
# 143 "/usr/include/x86_64-linux-gnu/bits/types.h" 2 3 4


typedef unsigned long int __dev_t;
typedef unsigned int __uid_t;
typedef unsigned int __gid_t;
typedef unsigned long int __ino_t;
typedef unsigned long int __ino64_t;
typedef unsigned int __mode_t;
typedef unsigned long int __nlink_t;
typedef long int __off_t;
typedef long int __off64_t;
typedef int __pid_t;
typedef struct { int __val[2]; } __fsid_t;
typedef long int __clock_t;
typedef unsigned long int __rlim_t;
typedef unsigned long int __rlim64_t;
typedef unsigned int __id_t;
typedef long int __time_t;
typedef unsigned int __useconds_t;
typedef long int __suseconds_t;
typedef long int __suseconds64_t;

typedef int __daddr_t;
typedef int __key_t;


typedef int __clockid_t;


typedef void * __timer_t;


typedef long int __blksize_t;




typedef long int __blkcnt_t;
typedef long int __blkcnt64_t;


typedef unsigned long int __fsblkcnt_t;
typedef unsigned long int __fsblkcnt64_t;


typedef unsigned long int __fsfilcnt_t;
typedef unsigned long int __fsfilcnt64_t;


typedef long int __fsword_t;

typedef long int __ssize_t;


typedef long int __syscall_slong_t;

typedef unsigned long int __syscall_ulong_t;



typedef __off64_t __loff_t;
typedef char *__caddr_t;


typedef long int __intptr_t;


typedef unsigned int __socklen_t;




typedef int __sig_atomic_t;
# 39 "/usr/include/stdio.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h" 1 3 4




# 1 "/usr/include/x86_64-linux-gnu/bits/types/__mbstate_t.h" 1 3 4
# 13 "/usr/include/x86_64-linux-gnu/bits/types/__mbstate_t.h" 3 4
typedef struct
{
  int __count;
  union
  {
    unsigned int __wch;
    char __wchb[4];
  } __value;
} __mbstate_t;
# 6 "/usr/include/x86_64-linux-gnu/bits/types/__fpos_t.h" 2 3 4




typedef struct _G_fpos_t
{
  __off_t __pos;
  __mbstate_t __state;
} __fpos_t;
# 40 "/usr/include/stdio.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h" 1 3 4
# 10 "/usr/include/x86_64-linux-gnu/bits/types/__fpos64_t.h" 3 4
typedef struct _G_fpos64_t
{
  __off64_t __pos;
  __mbstate_t __state;
} __fpos64_t;
# 41 "/usr/include/stdio.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/types/__FILE.h" 1 3 4



struct _IO_FILE;
typedef struct _IO_FILE __FILE;
# 42 "/usr/include/stdio.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/types/FILE.h" 1 3 4



struct _IO_FILE;


typedef struct _IO_FILE FILE;
# 43 "/usr/include/stdio.h" 2 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h" 1 3 4
# 35 "/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h" 3 4
struct _IO_FILE;
struct _IO_marker;
struct _IO_codecvt;
struct _IO_wide_data;




typedef void _IO_lock_t;





struct _IO_FILE
{
  int _flags;


  char *_IO_read_ptr;
  char *_IO_read_end;
  char *_IO_read_base;
  char *_IO_write_base;
  char *_IO_write_ptr;
  char *_IO_write_end;
  char *_IO_buf_base;
  char *_IO_buf_end;


  char *_IO_save_base;
  char *_IO_backup_base;
  char *_IO_save_end;

  struct _IO_marker *_markers;

  struct _IO_FILE *_chain;

  int _fileno;
  int _flags2;
  __off_t _old_offset;


  unsigned short _cur_column;
  signed char _vtable_offset;
  char _shortbuf[1];

  _IO_lock_t *_lock;







  __off64_t _offset;

  struct _IO_codecvt *_codecvt;
  struct _IO_wide_data *_wide_data;
  struct _IO_FILE *_freeres_list;
  void *_freeres_buf;
  size_t __pad5;
  int _mode;

  char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
};
# 44 "/usr/include/stdio.h" 2 3 4








typedef __gnuc_va_list va_list;
# 63 "/usr/include/stdio.h" 3 4
typedef __off_t off_t;
# 77 "/usr/include/stdio.h" 3 4
typedef __ssize_t ssize_t;






typedef __fpos_t fpos_t;
# 133 "/usr/include/stdio.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/stdio_lim.h" 1 3 4
# 134 "/usr/include/stdio.h" 2 3 4
# 143 "/usr/include/stdio.h" 3 4
extern FILE *stdin;
extern FILE *stdout;
extern FILE *stderr;






extern int remove (const char *__filename) __attribute__ ((__nothrow__ ));

extern int rename (const char *__old, const char *__new) __attribute__ ((__nothrow__ ));



extern int renameat (int __oldfd, const char *__old, int __newfd,
       const char *__new) __attribute__ ((__nothrow__ ));
# 178 "/usr/include/stdio.h" 3 4
extern int fclose (FILE *__stream);
# 188 "/usr/include/stdio.h" 3 4
extern FILE *tmpfile (void)
  __attribute__ ((__malloc__)) ;
# 205 "/usr/include/stdio.h" 3 4
extern char *tmpnam (char[20]) __attribute__ ((__nothrow__ )) ;




extern char *tmpnam_r (char __s[20]) __attribute__ ((__nothrow__ )) ;
# 222 "/usr/include/stdio.h" 3 4
extern char *tempnam (const char *__dir, const char *__pfx)
   __attribute__ ((__nothrow__ )) __attribute__ ((__malloc__)) ;






extern int fflush (FILE *__stream);
# 239 "/usr/include/stdio.h" 3 4
extern int fflush_unlocked (FILE *__stream);
# 258 "/usr/include/stdio.h" 3 4
extern FILE *fopen (const char *__restrict __filename,
      const char *__restrict __modes)
  __attribute__ ((__malloc__)) ;




extern FILE *freopen (const char *__restrict __filename,
        const char *__restrict __modes,
        FILE *__restrict __stream) ;
# 293 "/usr/include/stdio.h" 3 4
extern FILE *fdopen (int __fd, const char *__modes) __attribute__ ((__nothrow__ ))
  __attribute__ ((__malloc__)) ;
# 308 "/usr/include/stdio.h" 3 4
extern FILE *fmemopen (void *__s, size_t __len, const char *__modes)
  __attribute__ ((__nothrow__ )) __attribute__ ((__malloc__)) ;




extern FILE *open_memstream (char **__bufloc, size_t *__sizeloc) __attribute__ ((__nothrow__ ))
  __attribute__ ((__malloc__)) ;
# 328 "/usr/include/stdio.h" 3 4
extern void setbuf (FILE *__restrict __stream, char *__restrict __buf) __attribute__ ((__nothrow__ ));



extern int setvbuf (FILE *__restrict __stream, char *__restrict __buf,
      int __modes, size_t __n) __attribute__ ((__nothrow__ ));




extern void setbuffer (FILE *__restrict __stream, char *__restrict __buf,
         size_t __size) __attribute__ ((__nothrow__ ));


extern void setlinebuf (FILE *__stream) __attribute__ ((__nothrow__ ));







extern int fprintf (FILE *__restrict __stream,
      const char *__restrict __format, ...);




extern int printf (const char *__restrict __format, ...);

extern int sprintf (char *__restrict __s,
      const char *__restrict __format, ...) __attribute__ ((__nothrow__));





extern int vfprintf (FILE *__restrict __s, const char *__restrict __format,
       __gnuc_va_list __arg);




extern int vprintf (const char *__restrict __format, __gnuc_va_list __arg);

extern int vsprintf (char *__restrict __s, const char *__restrict __format,
       __gnuc_va_list __arg) __attribute__ ((__nothrow__));



extern int snprintf (char *__restrict __s, size_t __maxlen,
       const char *__restrict __format, ...)
     __attribute__ ((__nothrow__)) __attribute__ ((__format__ (__printf__, 3, 4)));

extern int vsnprintf (char *__restrict __s, size_t __maxlen,
        const char *__restrict __format, __gnuc_va_list __arg)
     __attribute__ ((__nothrow__)) __attribute__ ((__format__ (__printf__, 3, 0)));
# 403 "/usr/include/stdio.h" 3 4
extern int vdprintf (int __fd, const char *__restrict __fmt,
       __gnuc_va_list __arg)
     __attribute__ ((__format__ (__printf__, 2, 0)));
extern int dprintf (int __fd, const char *__restrict __fmt, ...)
     __attribute__ ((__format__ (__printf__, 2, 3)));







extern int fscanf (FILE *__restrict __stream,
     const char *__restrict __format, ...) ;




extern int scanf (const char *__restrict __format, ...) ;

extern int sscanf (const char *__restrict __s,
     const char *__restrict __format, ...) __attribute__ ((__nothrow__ ));





# 1 "/usr/include/x86_64-linux-gnu/bits/floatn.h" 1 3 4
# 119 "/usr/include/x86_64-linux-gnu/bits/floatn.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/floatn-common.h" 1 3 4
# 24 "/usr/include/x86_64-linux-gnu/bits/floatn-common.h" 3 4
# 1 "/usr/include/x86_64-linux-gnu/bits/long-double.h" 1 3 4
# 25 "/usr/include/x86_64-linux-gnu/bits/floatn-common.h" 2 3 4
# 214 "/usr/include/x86_64-linux-gnu/bits/floatn-common.h" 3 4
typedef float _Float32;
# 251 "/usr/include/x86_64-linux-gnu/bits/floatn-common.h" 3 4
typedef double _Float64;
# 268 "/usr/include/x86_64-linux-gnu/bits/floatn-common.h" 3 4
typedef double _Float32x;
# 285 "/usr/include/x86_64-linux-gnu/bits/floatn-common.h" 3 4
typedef long double _Float64x;
# 120 "/usr/include/x86_64-linux-gnu/bits/floatn.h" 2 3 4
# 431 "/usr/include/stdio.h" 2 3 4



extern int fscanf (FILE *__restrict __stream, const char *__restrict __format, ...) __asm__ ("" "__isoc99_fscanf") ;


extern int scanf (const char *__restrict __format, ...) __asm__ ("" "__isoc99_scanf") ;

extern int sscanf (const char *__restrict __s, const char *__restrict __format, ...) __asm__ ("" "__isoc99_sscanf") __attribute__ ((__nothrow__ ));
# 459 "/usr/include/stdio.h" 3 4
extern int vfscanf (FILE *__restrict __s, const char *__restrict __format,
      __gnuc_va_list __arg)
     __attribute__ ((__format__ (__scanf__, 2, 0))) ;





extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg)
     __attribute__ ((__format__ (__scanf__, 1, 0))) ;


extern int vsscanf (const char *__restrict __s,
      const char *__restrict __format, __gnuc_va_list __arg)
     __attribute__ ((__nothrow__ )) __attribute__ ((__format__ (__scanf__, 2, 0)));





extern int vfscanf (FILE *__restrict __s, const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vfscanf")



     __attribute__ ((__format__ (__scanf__, 2, 0))) ;
extern int vscanf (const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vscanf")

     __attribute__ ((__format__ (__scanf__, 1, 0))) ;
extern int vsscanf (const char *__restrict __s, const char *__restrict __format, __gnuc_va_list __arg) __asm__ ("" "__isoc99_vsscanf") __attribute__ ((__nothrow__ ))



     __attribute__ ((__format__ (__scanf__, 2, 0)));
# 513 "/usr/include/stdio.h" 3 4
extern int fgetc (FILE *__stream);
extern int getc (FILE *__stream);





extern int getchar (void);






extern int getc_unlocked (FILE *__stream);
extern int getchar_unlocked (void);
# 538 "/usr/include/stdio.h" 3 4
extern int fgetc_unlocked (FILE *__stream);
# 549 "/usr/include/stdio.h" 3 4
extern int fputc (int __c, FILE *__stream);
extern int putc (int __c, FILE *__stream);





extern int putchar (int __c);
# 565 "/usr/include/stdio.h" 3 4
extern int fputc_unlocked (int __c, FILE *__stream);







extern int putc_unlocked (int __c, FILE *__stream);
extern int putchar_unlocked (int __c);






extern int getw (FILE *__stream);


extern int putw (int __w, FILE *__stream);







extern char *fgets (char *__restrict __s, int __n, FILE *__restrict __stream)
                                                         ;
# 632 "/usr/include/stdio.h" 3 4
extern __ssize_t __getdelim (char **__restrict __lineptr,
                             size_t *__restrict __n, int __delimiter,
                             FILE *__restrict __stream) ;
extern __ssize_t getdelim (char **__restrict __lineptr,
                           size_t *__restrict __n, int __delimiter,
                           FILE *__restrict __stream) ;







extern __ssize_t getline (char **__restrict __lineptr,
                          size_t *__restrict __n,
                          FILE *__restrict __stream) ;







extern int fputs (const char *__restrict __s, FILE *__restrict __stream);





extern int puts (const char *__s);






extern int ungetc (int __c, FILE *__stream);






extern size_t fread (void *__restrict __ptr, size_t __size,
       size_t __n, FILE *__restrict __stream) ;




extern size_t fwrite (const void *__restrict __ptr, size_t __size,
        size_t __n, FILE *__restrict __s);
# 702 "/usr/include/stdio.h" 3 4
extern size_t fread_unlocked (void *__restrict __ptr, size_t __size,
         size_t __n, FILE *__restrict __stream) ;
extern size_t fwrite_unlocked (const void *__restrict __ptr, size_t __size,
          size_t __n, FILE *__restrict __stream);







extern int fseek (FILE *__stream, long int __off, int __whence);




extern long int ftell (FILE *__stream) ;




extern void rewind (FILE *__stream);
# 736 "/usr/include/stdio.h" 3 4
extern int fseeko (FILE *__stream, __off_t __off, int __whence);




extern __off_t ftello (FILE *__stream) ;
# 760 "/usr/include/stdio.h" 3 4
extern int fgetpos (FILE *__restrict __stream, fpos_t *__restrict __pos);




extern int fsetpos (FILE *__stream, const fpos_t *__pos);
# 786 "/usr/include/stdio.h" 3 4
extern void clearerr (FILE *__stream) __attribute__ ((__nothrow__ ));

extern int feof (FILE *__stream) __attribute__ ((__nothrow__ )) ;

extern int ferror (FILE *__stream) __attribute__ ((__nothrow__ )) ;



extern void clearerr_unlocked (FILE *__stream) __attribute__ ((__nothrow__ ));
extern int feof_unlocked (FILE *__stream) __attribute__ ((__nothrow__ )) ;
extern int ferror_unlocked (FILE *__stream) __attribute__ ((__nothrow__ )) ;







extern void perror (const char *__s);




extern int fileno (FILE *__stream) __attribute__ ((__nothrow__ )) ;




extern int fileno_unlocked (FILE *__stream) __attribute__ ((__nothrow__ )) ;
# 823 "/usr/include/stdio.h" 3 4
extern int pclose (FILE *__stream);





extern FILE *popen (const char *__command, const char *__modes)
  __attribute__ ((__malloc__)) ;






extern char *ctermid (char *__s) __attribute__ ((__nothrow__ ))
                                     ;
# 867 "/usr/include/stdio.h" 3 4
extern void flockfile (FILE *__stream) __attribute__ ((__nothrow__ ));



extern int ftrylockfile (FILE *__stream) __attribute__ ((__nothrow__ )) ;


extern void funlockfile (FILE *__stream) __attribute__ ((__nothrow__ ));
# 885 "/usr/include/stdio.h" 3 4
extern int __uflow (FILE *);
extern int __overflow (FILE *, int);
# 2 "test.c" 2
int main()
{
  printf("Hello World!\n");
  return 0;
}
==> /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/clang-cpp -v test.cpp
Homebrew clang version 19.1.3
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin
System configuration file directory: /home/linuxbrew/.linuxbrew/etc/clang
User configuration file directory: /home/brewer/tmp/homebrew/llvm-test-20241122-10685-mafssm/.config/clang
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/12
Candidate multilib: .;@m64
Selected multilib: .;@m64
 (in-process)
 "/home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/clang-19" -cc1 -triple x86_64-unknown-linux-gnu -E -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name test.cpp -mrelocation-model pic -pic-level 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fdebug-compilation-dir=/home/brewer/tmp/homebrew/llvm-test-20241122-10685-mafssm -v -fcoverage-compilation-dir=/home/brewer/tmp/homebrew/llvm-test-20241122-10685-mafssm -resource-dir /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19 -I/home/linuxbrew/.linuxbrew/opt/llvm/include -I/home/linuxbrew/.linuxbrew/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++ -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/x86_64-linux-gnu -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/backward -internal-isystem /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -fdeprecated-macro -ferror-limit 19 -fgnuc-version=4.2.1 -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o - -x c++ test.cpp
clang -cc1 version 19.1.3 based upon LLVM 19.1.3 default target x86_64-unknown-linux-gnu
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/x86_64-linux-gnu"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/backward"
ignoring nonexistent directory "/usr/lib/gcc/x86_64-linux-gnu/12/../../../../x86_64-linux-gnu/include"
ignoring nonexistent directory "/include"
#include "..." search starts here:
#include <...> search starts here:
 /home/linuxbrew/.linuxbrew/opt/llvm/include
 /home/linuxbrew/.linuxbrew/include
 /usr/lib/gcc/x86_64-linux-gnu/12/../../../../include/c++
 /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/lib/clang/19/include
 /usr/local/include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
test.cpp:1:10: fatal error: 'iostream' file not found
    1 | #include <iostream>
      |          ^~~~~~~~~~
# 1 "test.cpp"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 468 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "test.cpp" 2

int main()
{
  std::cout << "Hello World!" << std::endl;
  return 0;
}
1 error generated.
Error: llvm: failed
An exception occurred within a child process:
  BuildError: Failed executing: /home/linuxbrew/.linuxbrew/Cellar/llvm/19.1.3/bin/clang-cpp -v test.cpp
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:3141:in `block in system'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:3077:in `open'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:3077:in `system'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11647/lib/types/private/methods/call_validation.rb:175:in `bind_call'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11647/lib/types/private/methods/call_validation.rb:175:in `validate_call_skip_block_type'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11647/lib/types/private/methods/call_validation.rb:117:in `block in create_validator_slow_skip_block_type'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Taps/homebrew/homebrew-core/Formula/l/llvm.rb:606:in `block in <class:Llvm>'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2874:in `block (3 levels) in run_test'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/extend/kernel.rb:539:in `with_env'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2873:in `block (2 levels) in run_test'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:1208:in `with_logging'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2872:in `block in run_test'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/mktemp.rb:90:in `block in run'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/mktemp.rb:90:in `chdir'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/mktemp.rb:90:in `run'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11647/lib/types/private/methods/call_validation.rb:278:in `bind_call'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11647/lib/types/private/methods/call_validation.rb:278:in `validate_call'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11647/lib/types/private/methods/_methods.rb:277:in `block in _on_method_added'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:3200:in `mktemp'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11647/lib/types/private/methods/call_validation.rb:278:in `bind_call'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11647/lib/types/private/methods/call_validation.rb:278:in `validate_call'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/bundle/ruby/3.3.0/gems/sorbet-runtime-0.5.11647/lib/types/private/methods/_methods.rb:277:in `block in _on_method_added'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/formula.rb:2866:in `run_test'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/test.rb:48:in `block in <main>'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/3.3.6/lib/ruby/3.3.0/timeout.rb:186:in `block in timeout'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/3.3.6/lib/ruby/3.3.0/timeout.rb:41:in `handle_timeout'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/vendor/portable-ruby/3.3.6/lib/ruby/3.3.0/timeout.rb:195:in `timeout'
/home/linuxbrew/.linuxbrew/Homebrew/Library/Homebrew/test.rb:54:in `<main>'

[Bo98]

Looks like this happens if you have Ubuntu's gcc-12 installed but not g++-12 (or rather its dependency libstdc++-12-dev).

I'd probably call this an LLVM bug. Clang in C++ mode perhaps should filter GCC installations more strictly and fall back to the g++-11 install.

[carlocab]

clang test.cpp -o testcpp -lstdc++      

Alternatively:

clang++ test.cpp -o testcpp

[ipatch]

clang test.cpp -o testcpp -lstdc++      

Alternatively:

clang++ test.cpp -o testcpp

unfortunately on both my ubuntu install with homebrew in the default prefix of /home/linuxbrew/.linuxbrew and my local arch linux install with homebrew setup in ~/homebrew i have to explicitly "state / define / use" the -lstdc++ in order for the clang compiler to properly compile the hello world cpp source file because if i do not use -lstdc++ flag then i get the below error using the clang bin provided by llvm.

clang src/hello.cpp -o build/hello
/usr/bin/ld: /tmp/hello-b61020.o: in function `main':
hello.cpp:(.text+0x12): undefined reference to `std::cout'
/usr/bin/ld: hello.cpp:(.text+0x1e): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::operator<< <std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*)'
/usr/bin/ld: hello.cpp:(.text+0x28): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)'
/usr/bin/ld: hello.cpp:(.text+0x2d): undefined reference to `std::ostream::operator<<(std::ostream& (*)(std::ostream&))'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

the above output is from my arch linux install with homebrew

[carlocab]

That's because you should be using clang++ and not clang to compile .cpp files. Again, try:

clang++ src/hello.cpp -o build/hello

Note that I use clang++ and not clang in the command above. Note the ++.

You'll find the same error if you try to use gcc-12 (instead of g++-12) to compile a .cpp file.

[ipatch]

weird. indeed using clang++ to compile the .cpp fixed the linking issue.

for reasons i do not understand on my installation of llvm it seems clang and clang++ are symlinked to the same executable. so why would running clang++ fix the linking issue?

╰─λ l $bp/bin/clang
lrwxrwxrwx 1 capin users 31 Nov  1 14:04 /home/capin/homebrew/bin/clang -> ../Cellar/llvm/19.1.3/bin/clang*

╰─λ l $bp/bin/clang++
lrwxrwxrwx 1 capin users 33 Nov  1 14:04 /home/capin/homebrew/bin/clang++ -> ../Cellar/llvm/19.1.3/bin/clang++*

╰─λ l $bp/Cellar/llvm/19.1.3/bin/
total 747M
drwxr-xr-x 2 capin users 4.0K Oct 29 05:09 ./
drwxr-xr-x 8 capin users 4.0K Nov  1 14:04 ../
-r-xr-xr-x 1 capin users  50K Nov  1 14:04 amdgpu-arch*
-r-xr-xr-x 1 capin users  557 Oct 29 05:09 analyze-build*
-r-xr-xr-x 1 capin users 627K Nov  1 14:04 bugpoint*
-r-xr-xr-x 1 capin users  50M Nov  1 14:04 c-index-test*
lrwxrwxrwx 1 capin users    8 Oct 29 05:09 clang -> clang-19*
lrwxrwxrwx 1 capin users    5 Oct 29 05:09 clang++ -> clang*
-r-xr-xr-x 1 capin users 242K Nov  1 14:04 clang-19*

it looks like both symlinks will resolve to clang-19 no?

[carlocab]

clang behaves differently depending on how it's called.

For example, try:

clang --print-target-triple
arm64-apple-macosx-clang --print-target-triple

where arm64-apple-macosx-clang is a symlink to clang.