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c++: fix old cast warnings

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We still have a few old C casts in lalr1.cc, let's get rid of them.
Reported by Frank Heckenbach.

Actually, let's monitor all our casts using easy to grep macros.
Let's use these macros to use the C++ standard casts when we are in
C++.

* data/skeletons/c.m4 (b4_cast_define): New.
* data/skeletons/glr.c, data/skeletons/glr.cc,
* data/skeletons/lalr1.cc, data/skeletons/stack.hh,
* data/skeletons/yacc.c:
Use it and/or its casts.

* tests/actions.at, tests/cxx-type.at,
* tests/glr-regression.at, tests/headers.at, tests/torture.at,
* tests/types.at:
Use YY_CAST instead of C casts.

* configure.ac (warn_cxx): Add -Wold-style-cast.
* doc/bison.texi: Disable it.
This commit is contained in:
Akim Demaille
2019-11-01 16:13:46 +01:00
parent 2bd1d9e20f
commit 3398b0fa90
14 changed files with 186 additions and 137 deletions
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4
doc/bison.texi
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@@ -12251,10 +12251,12 @@ then the parser's to get the set of defined tokens.
# pragma GCC diagnostic ignored "-Wnull-dereference"
#endif
// Of course, when compiling C as C++, expect warnings about NULL.
// This example uses Flex's C backend, yet compiles it as C++.
// So expect warnings about C style casts and NULL.
#if defined __clang__
# pragma clang diagnostic ignored "-Wzero-as-null-pointer-constant"
#elif defined __GNUC__ && 407 <= __GNUC__ * 100 + __GNUC_MINOR__
# pragma GCC diagnostic ignored "-Wold-style-cast"
# pragma GCC diagnostic ignored "-Wzero-as-null-pointer-constant"
#endif