[PING, PATCH] darwin, d: Support outfile substitution for liphobos

[Iain Buclaw]

Ping.

Are the common gcc parts OK (also for backporting)?

Iain.

Excerpts from Iain Buclaw's message of November 26, 2021 1:51 pm:
> Excerpts from Iain Sandoe's message of November 19, 2021 10:21 am:
>> Hi Iain
>> 
>>> On 19 Nov 2021, at 08:32, Iain Buclaw <ibuclaw@gdcproject.org> wrote:
>> 
>>> This patch fixes a stage2 bootstrap failure in the D front-end on
>>> darwin due to libgphobos being dynamically linked despite
>>> -static-libphobos being on the command line.
>>> 
>>> In the gdc driver, this takes the previous fix for the Darwin D
>>> bootstrap, and extends it to the -static-libphobos option as well.
>>> Rather than pushing the -static-libphobos option back onto the command
>>> line, the setting of SKIPOPT is instead conditionally removed.  The same
>>> change has been repeated for -static-libstdc++ so there is now no need
>>> to call generate_option to re-add it.
>>> 
>>> In the gcc driver, -static-libphobos has been added as a common option,
>>> validated, and a new outfile substition added to config/darwin.h to
>>> correctly replace -lgphobos with libgphobos.a.
>>> 
>>> Bootstrapped and regression tested on x86_64-linux-gnu and
>>> x86_64-apple-darwin20.
>>> 
>>> OK for mainline?  This would also be fine for gcc-11 release branch too,
>>> as well as earlier releases with D support.
>> 
>> the Darwin parts are fine, thanks 
>> 
>> The SKIPOPT in d-spec, presumably means “skip removing this opt”?
>> otherwise the #ifndef looks odd (because of the static-libgcc|static-libphobos,
>> darwin.h would do the substitution for -static-libgcc as well, so it’s not a 100%
>> test).
>> 
> 
> I've only just realised what you meant.  Yes you are of course right,
> and it should have been #ifdef, attaching a fixed-up patch.
> 
> Iain.
> 
> ---
>     gcc/ChangeLog:
>     
>             * common.opt (static-libphobos): Add option.
>             * config/darwin.h (LINK_SPEC): Substitute -lgphobos with libgphobos.a
>             when linking statically.
>             * gcc.c (driver_handle_option): Set -static-libphobos as always valid.
>     
>     gcc/d/ChangeLog:
>     
>             * d-spec.cc (lang_specific_driver): Set SKIPOPT on -static-libstdc++
>             and -static-libphobos only when target supports LD_STATIC_DYNAMIC.
>             Remove generate_option to re-add -static-libstdc++.
>     
>     libphobos/ChangeLog:
>     
>             * testsuite/testsuite_flags.in: Add libphobos library directory as
>             search path to --gdcldflags.
> 
> diff --git a/gcc/common.opt b/gcc/common.opt
> index db6010e4e20..73c12d933f3 100644
> --- a/gcc/common.opt
> +++ b/gcc/common.opt
> @@ -3527,6 +3527,10 @@ static-libgfortran
>  Driver
>  ; Documented for Fortran, but always accepted by driver.
>  
> +static-libphobos
> +Driver
> +; Documented for D, but always accepted by driver.
> +
>  static-libstdc++
>  Driver
>  
> diff --git a/gcc/config/darwin.h b/gcc/config/darwin.h
> index 7ed01efa694..c4ddd623e8b 100644
> --- a/gcc/config/darwin.h
> +++ b/gcc/config/darwin.h
> @@ -443,6 +443,7 @@ extern GTY(()) int darwin_ms_struct;
>                       %:replace-outfile(-lobjc libobjc-gnu.a%s); \
>                      :%:replace-outfile(-lobjc -lobjc-gnu )}}\
>     %{static|static-libgcc|static-libgfortran:%:replace-outfile(-lgfortran libgfortran.a%s)}\
> +   %{static|static-libgcc|static-libphobos:%:replace-outfile(-lgphobos libgphobos.a%s)}\
>     %{static|static-libgcc|static-libstdc++|static-libgfortran:%:replace-outfile(-lgomp libgomp.a%s)}\
>     %{static|static-libgcc|static-libstdc++:%:replace-outfile(-lstdc++ libstdc++.a%s)}\
>     %{force_cpusubtype_ALL:-arch %(darwin_arch)} \
> diff --git a/gcc/d/d-spec.cc b/gcc/d/d-spec.cc
> index b12d28f1047..1304126a675 100644
> --- a/gcc/d/d-spec.cc
> +++ b/gcc/d/d-spec.cc
> @@ -253,13 +253,23 @@ lang_specific_driver (cl_decoded_option **in_decoded_options,
>  
>  	case OPT_static_libstdc__:
>  	  saw_static_libcxx = true;
> +#ifdef HAVE_LD_STATIC_DYNAMIC
> +	  /* Remove -static-libstdc++ from the command only if target supports
> +	     LD_STATIC_DYNAMIC.  When not supported, it is left in so that a
> +	     back-end target can use outfile substitution.  */
>  	  args[i] |= SKIPOPT;
> +#endif
>  	  break;
>  
>  	case OPT_static_libphobos:
>  	  if (phobos_library != PHOBOS_NOLINK)
>  	    phobos_library = PHOBOS_STATIC;
> +#ifdef HAVE_LD_STATIC_DYNAMIC
> +	  /* Remove -static-libphobos from the command only if target supports
> +	     LD_STATIC_DYNAMIC.  When not supported, it is left in so that a
> +	     back-end target can use outfile substitution.  */
>  	  args[i] |= SKIPOPT;
> +#endif
>  	  break;
>  
>  	case OPT_shared_libphobos:
> @@ -460,7 +470,7 @@ lang_specific_driver (cl_decoded_option **in_decoded_options,
>  #endif
>      }
>  
> -  if (saw_libcxx || need_stdcxx)
> +  if (saw_libcxx || saw_static_libcxx || need_stdcxx)
>      {
>  #ifdef HAVE_LD_STATIC_DYNAMIC
>        if (saw_static_libcxx && !static_link)
> @@ -468,12 +478,6 @@ lang_specific_driver (cl_decoded_option **in_decoded_options,
>  	  generate_option (OPT_Wl_, LD_STATIC_OPTION, 1, CL_DRIVER,
>  			   &new_decoded_options[j++]);
>  	}
> -#else
> -      /* Push the -static-libstdc++ option back onto the command so that
> -	 a target without LD_STATIC_DYNAMIC can use outfile substitution.  */
> -      if (saw_static_libcxx && !static_link)
> -	generate_option (OPT_static_libstdc__, NULL, 1, CL_DRIVER,
> -			 &new_decoded_options[j++]);
>  #endif
>        if (saw_libcxx)
>  	new_decoded_options[j++] = *saw_libcxx;
> diff --git a/gcc/gcc.c b/gcc/gcc.c
> index 506c2acc282..fea6d049183 100644
> --- a/gcc/gcc.c
> +++ b/gcc/gcc.c
> @@ -4576,10 +4576,12 @@ driver_handle_option (struct gcc_options *opts,
>      case OPT_static_libgcc:
>      case OPT_shared_libgcc:
>      case OPT_static_libgfortran:
> +    case OPT_static_libphobos:
>      case OPT_static_libstdc__:
>        /* These are always valid, since gcc.c itself understands the
> -	 first two, gfortranspec.c understands -static-libgfortran and
> -	 g++spec.c understands -static-libstdc++ */
> +	 first two, gfortranspec.c understands -static-libgfortran,
> +	 d-spec.cc understands -static-libphobos, and g++spec.c
> +	 understands -static-libstdc++ */
>        validated = true;
>        break;
>  
> diff --git a/libphobos/testsuite/testsuite_flags.in b/libphobos/testsuite/testsuite_flags.in
> index bafd5ad4502..8e2f1eefd5b 100755
> --- a/libphobos/testsuite/testsuite_flags.in
> +++ b/libphobos/testsuite/testsuite_flags.in
> @@ -46,6 +46,7 @@ case ${query} in
>      --gdcldflags)
>        GDCLDFLAGS="-B${BUILD_DIR}/src
>                    -B${BUILD_DIR}/libdruntime/gcc
> +                  -B${BUILD_DIR}/src/.libs
>                    -L${BUILD_DIR}/src/.libs"
>        echo ${GDCLDFLAGS}
>        ;;
>