Re: pkg/57647: lang/clang 6.0.6 update not usable for building other packages

[David Shao <davshao%gmail.com@localhost>]

The following reply was made to PR pkg/57647; it has been noted by GNATS.

From: David Shao <davshao%gmail.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: pkg/57647: lang/clang 6.0.6 update not usable for building other packages
Date: Tue, 17 Oct 2023 19:13:35 -0700

 I am aware and have applied the fix for one package
 lang/wasi-compiler-rt. That enables
 that package to build.
 
 But let us think about the logic of this situation.  llvm and clang
 were updated from 15 to 16.
 How is the foundational cause the fault of that one package?
 
 Here is another demonstration.  For x11/xfce4-terminal, try switching
 the compiler to clang
 from NetBSD amd64 current, X11_TYPE native.
 
 PKGSRC_COMPILER=clang
 
 .include "../../lang/clang/buildlink3.mk"
 
 and whatever else in Makefile.  It seems to build fine.  Except if one
 looks at the config.log:
 
 Target: x86_64-unknown-netbsd10.99
 Thread model: posix
 InstalledDir: /usr/pkg/bin
 configure:4060: $? = 0
 configure:4049: gcc -v >&5
 clang version 16.0.6
 Target: x86_64-unknown-netbsd10.99
 Thread model: posix
 InstalledDir: /usr/pkg/bin
  "/usr/bin/ld" --eh-frame-hdr -pie -dynamic-linker /libexec/ld.elf_so
 -o a.out /usr/lib/crt0.o /usr/lib/crti.o /usr/lib/crtbeginS.o -zrelro
 -lc /usr/lib/crtendS.o /usr/lib/crtn.o
 /usr/bin/ld: /usr/lib/crt0.o: in function `___start':
 (.text+0x2d9): undefined reference to `main'
 clang-16: error: linker command failed with exit code 1 (use -v to see
 invocation)
 configure:4060: $? = 1
 configure:4049: gcc -V >&5
 clang-16: error: unsupported option '-V -Qunused-arguments'
 configure:4060: $? = 1
 configure:4049: gcc -qversion >&5
 clang-16: error: unknown argument '-qversion'; did you mean '--version'?
 configure:4060: $? = 1
 configure:4049: gcc -version >&5
 clang-16: error: unknown argument '-version'; did you mean '--version'?
 configure:4060: $? = 1
 configure:4080: checking whether the C compiler works
 configure:4102: gcc -O2 -I/usr/pkg/include -I/usr/pkg/include/glib-2.0
 -I/usr/pkg/include/gio-unix-2.0 -I/usr/pkg/lib/glib-2.0/include
 -I/usr/include -I/usr/X11R7/include -I/usr/pkg/include/freetype2
 -I/usr/pkg/include/harfbuzz -I/usr/X11R7/include/libdrm
 -I/usr/pkg/include -I/usr/pkg/include/glib-2.0
 -I/usr/pkg/include/gio-unix-2.0 -I/usr/pkg/lib/glib-2.0/include
 -I/usr/include -I/usr/X11R7/include -I/usr/pkg/include/freetype2
 -I/usr/pkg/include/harfbuzz -I/usr/X11R7/include/libdrm -Wl,-zrelro
 -L/usr/pkg/lib -Wl,-R/usr/pkg/lib -L/usr/lib -Wl,-R/usr/lib
 -L/usr/X11R7/lib -Wl,-R/usr/X11R7/lib conftest.c  >&5
 
 If I am reading this correctly, configure finds that clang 16 doesn't
 work and switches to NetBSD's current base gcc, which is
 good enough since it is gcc 10.
 
 I have doubts that clang-16 is functioning close to what it should do.