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Re: CLANG10 interesting warning !


From: Andrew Makhorin
Subject: Re: CLANG10 interesting warning !
Date: Fri, 17 Jul 2020 18:28:51 +0300

On Fri, 2020-07-17 at 16:53 +0200, Domingo Alvarez Duarte wrote:
> Hello !
> 
> When compiling with CLANG10 we get this warning:
> 
> =====
> 
>   clang -DHAVE_CONFIG_H -I. -I.. -I. -I./amd -I./api -I./bflib 
> -I./colamd -I./draft -I./env -I./intopt -I./minisat -I./misc -I./mpl 
> -I./npp -I./proxy -I./simplex -I./zlib -g -O3 -march=native -DNEBUG 
> -DWITH_SPLAYTREE -flto 
> -I/home/mingo/local/clang-10/lib/clang/10.0.0/include 
> -I/home/mingo/local/clang-10/include -I/home/mingo/local/include -MT 
> libglpk_la-spxprim.lo -MD -MP -MF .deps/libglpk_la-spxprim.Tpo -c 
> simplex/spxprim.c  -fPIC -DPIC -o .libs/libglpk_la-spxprim.o
> simplex/spxprim.c:1526:7: warning: add explicit braces to avoid
> dangling 
> else [-Wdangling-else]
>        else
>        ^
> 1 warning generated.
> 

This is a well-known syntactic problem dated back to Algol 60.

The statement:

        if A then if B then C else D

can be interpreted in two ways:

        if A then (if B then C) else D

        if A then (if B then C else D)

However, this disambiguation doesn't appear in C due to its more
perfect grammar.



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