Does gcc now depend on libintl-devel ?

[gs-cygwin.com@gluelogic.com]

On Mon, Feb 26, 2024 at 10:49:55AM -0700, Brian Inglis via Cygwin wrote:
> On 2024-02-25 21:33, gs-cygwin.com--- via Cygwin wrote:
> > Does gcc now depend on libintl-devel ?  Is this dependency declared?
> > 
> > Along with the release of cygwin 3.5.0, my CI on github started failing,
> > where autoconf would report that a working C compiler was not found for
> > the Cygwin build.
> > 
> > The github workflow in question: search for "Windows-Cygwin" in
> > https://github.com/lighttpd/lighttpd1.4/blob/master/.github/workflows/pr.yml
> > 
> > I added libintl-devel package to the package install list and things
> > started working again.  This was a couple weeks ago and I forget exactly
> > what I did to reproduce it locally, but if you need more details, I can
> > try to document more carefully.
> > 
> > Here is the workflow job which failed two weeks ago:
> > https://github.com/gstrauss/lighttpd1.4/actions/runs/7841762861/job/21398761239
> > checking whether the C compiler works... no
> > configure: error: in '/cygdrive/d/a/lighttpd1.4/lighttpd1.4':
> > configure: error: C compiler cannot create executables
> 
> $ cygcheck gcc
> Found: C:/.../cygwin64/bin/gcc.exe
> C:/.../cygwin64/bin/gcc.exe
>   C:/.../cygwin64/bin/cygwin1.dll
>     C:/WINDOWS/system32/KERNEL32.dll
>       C:/WINDOWS/system32/ntdll.dll
>       C:/WINDOWS/system32/KERNELBASE.dll
>   C:/.../cygwin64/bin/cygiconv-2.dll
>   C:/.../cygwin64/bin/cygintl-8.dll
> 
> so gcc depends on packages libiconv2 and libintl8, and others, providing the
> DLLs, as documented on the gcc-core package summary page:
> 
> 	https://cygwin.com/packages/summary/gcc-core.html
> 
> and building gcc-core etc. will require libiconv-devel and libintl-devel.
> 
> Check your package build dependencies, and config logs, as internationalized
> packages, as yours may be, require any or all of gettext-devel,
> libiconv-devel, libintl-devel, po4a to build, and some of your build
> dependencies may require headers or libraries provided by -devel packages,
> as cygwin itself requires libintl8, and those -devel packages to build.
> 
> You may want to rerun configure with --verbose messages and look at what the
> failing check script and test program expects to be available to use.

I tracked down the problem to using -t in
  & C:\setup.exe -qgnO -t | Out-Default
where the significant flag is -t (--allow-test-packages)

If I remove -t, then my build is fine.

If I add -t, then autoconf fails in ./configure with:

checking for gcc... gcc
checking whether the C compiler works... no
configure: error: in '/cygdrive/d/a/lighttpd1.4/lighttpd1.4':
configure: error: C compiler cannot create executables

If I explicitly install libintl-devel in the container setup,
and then run the above command with -t, then my build is fine.

==> Would the gcc maintainer take a look at what is in test packages
    declared dependencies?

When I run with (-t): & C:\setup.exe -qgnO -t | Out-Default
  22 install gcc-g++       13.2.1+20240203-0.1      
  23   erase gcc-g++       11.4.0-1   
https://github.com/gstrauss/lighttpd1.4/actions/runs/8059762782/job/22014713232
(log contains output of cygcheck gcc)


...Some more attempts later, I see this in config.log when my container
has a *minimal* set of packages installed.  Missing -liconv.  Apparently
iconv is a dependency of some other packages in my full build.

configure:4330: checking whether the C compiler works
configure:4352: gcc    conftest.c  >&5
/usr/lib/gcc/x86_64-pc-cygwin/13/../../../../x86_64-pc-cygwin/bin/ld: cannot find -liconv: No such file or directory
collect2: error: ld returned 1 exit status

I understand that I can manually install additional packages.

My question is that if I install gcc test package via
  & C:\setup.exe -qgnO -t | Out-Default
shouldn't setup.exe should also install the appropriate dependencies
in order for the updated gcc to work?

My container had a working gcc 11.4.0 prior to
  & C:\setup.exe -qgnO -t | Out-Default
and has a broken gcc 13.2.1 after the update.

After reconfiguring the container to use my original set of packages
(minus libintl-devel):

configure:4330: checking whether the C compiler works
configure:4352: gcc    conftest.c  >&5
/usr/lib/gcc/x86_64-pc-cygwin/13/../../../../x86_64-pc-cygwin/bin/ld: cannot find -lintl: No such file or directory
collect2: error: ld returned 1 exit status

Adding back libintl-devel and things work again.
https://github.com/lighttpd/lighttpd1.4/blob/master/.github/workflows/ci.yml

Cheers, Glenn