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tests: fight G++ warnings about zero as null pointer constant

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In C++ pre C++11 it is standard practice to use 0 for the null pointer.
But GCC pre 8 -std=c++98 with -Wzero-as-null-pointer-constant warns about
this.

So disable -Wzero-as-null-pointer-constant when compiling C++ pre 11.
Let's do this in AT_DATA_SOURCE_PROLOGUE (which is pasted on top of
all the test grammar files).  Unfortunately, that shifts all the
locations in the expected error messages, which would be too noisy.
Instead, let's introduce testsuite.h, which can vary in length, and
include it in AT_DATA_SOURCE_PROLOGUE.

* tests/testsuite.h: New.
Disable -Wzero-as-null-pointer-constant's warning with GCC pre 8,
C++ pre 11.
* tests/local.at (AT_DATA_SOURCE_PROLOGUE): Use it.
* tests/atlocal.in (CPPFLAGS): Find it.
* tests/local.mk: Ship it.
* data/c.m4 (YY_NULLPTR): Prefer ((void*)0) to 0 in C.
This commit is contained in:
Akim Demaille
2018-09-15 09:16:06 +02:00
parent 9611baf855
commit 7c64b1f4ff
5 changed files with 33 additions and 11 deletions
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13
data/c.m4
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@@ -267,12 +267,19 @@ m4_define([b4_attribute_define],
# --------------
# Portability issues: define a YY_NULLPTR appropriate for the current
# language (C, C++98, or C++11).
#
# In C++ pre C++11 it is standard practice to use 0 (not NULL) for the
# null pointer. In C, prefer ((void*)0) to avoid having to include stdlib.h.
m4_define([b4_null_define],
[# ifndef YY_NULLPTR
# if defined __cplusplus && 201103L <= __cplusplus
# define YY_NULLPTR nullptr
# if defined __cplusplus
# if 201103L <= __cplusplus
# define YY_NULLPTR nullptr
# else
# define YY_NULLPTR 0
# endif
# else
# define YY_NULLPTR 0
# define YY_NULLPTR ((void*)0)
# endif
# endif[]dnl
])