Re: [PATCH v2] Produce more verbose error if cppi not found

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On Mon, 2019-06-17 at 14:13 +0200, Michal Privoznik wrote:
[...]
> @@ -695,6 +695,11 @@ sc_require_whitespace_in_translation:
>  	  { echo '$(ME): missing whitespace at line split' 1>&2; \
>  	    exit 1; } || :
>  
> +cppi_banner = \
> +	" *****************************************************\n" \
> +	"* cppi not installed, some checks have been skipped *\n" \
> +	"*****************************************************"
> +
>  # Enforce recommended preprocessor indentation style.
>  sc_preprocessor_indentation:
>  	@if cppi --version >/dev/null 2>&1; then \
> @@ -702,7 +707,7 @@ sc_preprocessor_indentation:
>  	    || { echo '$(ME): incorrect preprocessor indentation' 1>&2; \
>  		exit 1; }; \
>  	else \
> -	  echo '$(ME): skipping test $@: cppi not installed' 1>&2; \
> +	  echo -e "$(ME): skipping test $@:\n"$(cppi_banner) 1>&2; \
>  	fi
>  
>  # Enforce similar spec file indentation style, by running cppi on a
> @@ -719,7 +724,7 @@ sc_spec_indentation:
>  	    || { echo '$(ME): incorrect preprocessor indentation' 1>&2; \
>  		exit 1; }; \
>  	else \
> -	  echo '$(ME): skipping test $@: cppi not installed' 1>&2; \
> +	  echo -e "$(ME): skipping test $@:\n"$(cppi_banner) 1>&2; \
>  	fi
>  
>  # Nested conditionals are easier to understand if we enforce that endifs

How about this instead of all of the above?

----- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< ----- 8< -----
@@ -1150,6 +1145,11 @@ ifneq ($(_gl-Makefile),)
 syntax-check: spacing-check test-wrap-argv \
        prohibit-duplicate-header mock-noinline group-qemu-caps \
         header-ifdef
+       @if ! cppi --version >/dev/null 2>&1; then \
+         echo "*****************************************************" >&2; \
+         echo "* cppi not installed, some checks have been skipped *" >&2; \
+         echo "*****************************************************" >&2; \
+       fi
 endif

 # Don't include duplicate header in the source (either *.c or *.h)
----- >8 ----- >8 ----- >8 ----- >8 ----- >8 ----- >8 ----- >8 -----

That is, keep briefly mentioning that a specific check has been
skipped because cppi is unavailable as we're already doing, but also
print a big fat warning *at the very end* so that you can't possibly
miss it even if you have been paying no attention while the command
was running.

[...]
> +# For 'make syntax-check'
> +%if 0%{?fedora}
> +BuildRequires: cppi
> +%endif

Pavel almost convinced me this is not appropriate for the spec file
by pointing out that we're not actually running 'make syntax-check'
when building the RPM, but Dan pointed out that it can be useful
for people using 'dnf builddep' so it's kind of a toss-up...

I'd probably slightly prefer dropping the hunk, especially once we
have the big fat warning.

-- 
Andrea Bolognani / Red Hat / Virtualization

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