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Do not disable incompatible-pointer-types-discards-qualifiers

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This reverts commit b3710e9a2a.

That check is very valuable for our code, but it causes issue with glib >=
2.67.0 when building with clang.

The reason is a combination of two commits in glib, firstly fdda405b6b1b which
adds a g_atomic_pointer_{set,get} variants that enforce stricter type
checking (by removing an extra cast) for compilers that support __typeof__, and
commit dce24dc4492d which effectively enabled the new variant of glib's atomic
code for clang.  This will not be necessary when glib's issue #600 [0] (8 years
old) is fixed.  Thankfully, MR #1719 [1], which is supposed to deal with this
issue was opened 3 weeks ago, so there is a slight sliver of hope.

[0] https://gitlab.gnome.org/GNOME/glib/-/issues/600
[1] https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1719

Signed-off-by: Martin Kletzander <mkletzan@redhat.com>
This commit is contained in:
Martin Kletzander 2020-11-12 13:58:53 +01:00
parent 318658b36b
commit 65491a2dfe
2 changed files with 24 additions and 3 deletions
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3
meson.build
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@ -405,9 +405,6 @@ cc_flags += [
# so use this Clang-specific arg to keep it quiet
'-Wno-typedef-redefinition',
# Clang complains about casts in G_DEFINE_TYPE(...)
'-Wno-incompatible-pointer-types-discards-qualifiers',
# We don't use -Wc++-compat so we have to enable it explicitly
'-Wjump-misses-init',

24
src/util/glibcompat.h
View File

@ -20,6 +20,30 @@
#include <glib.h>
#include <glib/gstdio.h>
#include <glib-object.h>
#if defined(__clang__) && GLIB_CHECK_VERSION(2, 67, 0)
/*
* Clang detects (valid) issue in G_DEFINE_TYPE and derivatives starting with
* glib >= 2.67.0. See https://gitlab.gnome.org/GNOME/glib/-/issues/600
*
* For that we need to disable the one check that produces an error in our
* builds when using any G_DEFINE_TYPE* macro. Thankfully all those macros end
* up using _G_DEFINE_TYPE_EXTENDED_BEGIN. Because with that we can redefine
* this one macro to cover all use cases. The macro is defined the same way it
* is defined in glib (with a very low probability of being changed thanks to a
* comment above it).
*/
# undef _G_DEFINE_TYPE_EXTENDED_BEGIN
# define _G_DEFINE_TYPE_EXTENDED_BEGIN(TypeName, type_name, TYPE_PARENT, flags) \
_Pragma("GCC diagnostic push") \
_Pragma("GCC diagnostic ignored \"-Wincompatible-pointer-types-discards-qualifiers\"") \
_G_DEFINE_TYPE_EXTENDED_BEGIN_PRE(TypeName, type_name, TYPE_PARENT) \
_G_DEFINE_TYPE_EXTENDED_BEGIN_REGISTER(TypeName, type_name, TYPE_PARENT, flags) \
_Pragma("GCC diagnostic pop")
#endif /* __clang__ */
gchar * vir_g_canonicalize_filename(const gchar *filename,
const gchar *relative_to);