bug#43742: Unable to compile ada-mode

[Simon Wright]

GCC 10[.1.0] has the problem.
GCC 9[.1.0] does not.

I haven't bothered to install the necessary gnatcoll packages in GNAT CE 2020 
so I don't know whether it would work or fail.

> On 1 Oct 2020, at 05:55, Colton Lewis <colton.w.lewis@protonmail.com> wrote:
> 
> Package: emacs, ada-mode
> 
> I have recently tried and failed to compile ada-mode.
> This may be a bug in -gnat2020 support, but I'm not
> sure how the list wants to handle a solution.
> 
> emacs-27.1
> ada-mode-7.1.4
> gnat-10.2.1
> 
> $ ./build.sh
> ...
> gen_run_wisi_lr_parse.ads:27:52: missing ";"
> gen_run_wisi_lr_parse.ads:27:65: generic private child packages not permitted
> gen_run_wisi_lr_parse.ads:27:65: subprogram specification expected
> gen_run_wisi_lr_parse.ads:27:65: compilation unit expected
> gen_run_wisi_lr_parse.ads:34:04: misplaced "with"
> gen_run_wisi_lr_parse.ads:34:09: reserved word "procedure" cannot be used as 
> identifier
> gen_run_wisi_lr_parse.ads:34:18: missing ";"
> gen_run_wisi_lr_parse.ads:34:19: compilation unit expected
> clang-10: error: argument unused during compilation: 
> '-specs=/tmp/GNAT-TEMP-000012.TMP' [-Werror,-Wunused-command-line-argument]
> 
>   compilation of ada_mode_wisi_lalr_parse.ads failed
>   compilation of ada_mode_wisi_lr1_parse.ads failed
>   compilation of run_ada_lalr_parse.ads failed
>   compilation of run_ada_lr1_parse.ads failed
>   compilation of gpr_mode_wisi_parse.ads failed
>   compilation of run_gpr_parse.ads failed
>   compilation of wisitoken_grammar_re2c.c failed
> 
> gprbuild: *** compilation phase failed
> 
> It is choking on the line:
> type Parse_Data_Type is new Wisi.Parse_Data_Type with private;
> 
> As far as I can tell from the ARM, this should be legal in 2020 and 2012.
> Also note the clang error. Trying with some options.
> 
> $ ./build -cargs:ada -gnat2012 -cargs:c 
> -Wno-error=unused-command-line-argument
> ...
> Compile
>   [Ada]          ada_mode_wisi_lalr_parse.ads
>   [Ada]          ada_mode_wisi_lr1_parse.ads
>   [Ada]          run_ada_lalr_parse.ads
>   [Ada]          run_ada_lr1_parse.ads
>   [Ada]          gpr_mode_wisi_parse.ads
>   [Ada]          run_gpr_parse.ads
>   [Ada]          gpr_query.adb
>   [C]            wisitoken_grammar_re2c.c
> gpr_query.adb:553:19: target_name is an Ada 2020 feature
> gpr_query.adb:553:22: (style) space not allowed
> clang-10: warning: argument unused during compilation: 
> '-specs=/tmp/GNAT-TEMP-000012.TMP' [-Wunused-command-line-argument]
> 
>   compilation of gpr_query.adb failed
> 
> And we fail again lacking a 2020 feature.
> 
> 
> 
> 
> 
>