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build: Check size_t compatibility with various other types

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When choosing the type to base `size_t` on, check the compatibility of
passing pointers, as well as the width of the type, to avoid compiler
warnings in future.

For now, the code to do the checks is fairly ugly due to limitations in
Meson. In particular, the new checks are limited to gcc and clang (other
compilers will behave as before), and they are all duplicated. See the
comments in the code for links to Meson improvement requests.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Fixes: #1777
This commit is contained in:
Philip Withnall 2019-10-28 17:05:46 +00:00
parent 963786f608
commit 505c954424
1 changed files with 62 additions and 4 deletions
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meson.build
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@ -1320,28 +1320,86 @@ else
glibconfig_conf.set('g_searchpath_separator', ':')
endif
if sizet_size == short_size
g_sizet_compatibility = {
'short': sizet_size == short_size,
'int': sizet_size == int_size,
'long': sizet_size == long_size,
'long long': sizet_size == long_long_size,
}
# Do separate checks for gcc/clang (and ignore other compilers for now), since
# we need to explicitly pass -Werror to the compilers.
# FIXME: https://github.com/mesonbuild/meson/issues/5399
# We can’t simplify these checks using a foreach loop because dictionary keys
# have to be string literals.
# FIXME: https://github.com/mesonbuild/meson/issues/5231
if cc.get_id() == 'gcc' or cc.get_id() == 'clang'
g_sizet_compatibility += {
'short': g_sizet_compatibility['short'] and cc.compiles(
'''#include <stddef.h>
size_t f (size_t *i) { return *i + 1; }
int main (void) {
unsigned short i = 0;
f (&i);
return 0;
}''',
args: ['-Werror'],
name : 'GCC size_t typedef is short'),
'int': g_sizet_compatibility['int'] and cc.compiles(
'''#include <stddef.h>
size_t f (size_t *i) { return *i + 1; }
int main (void) {
unsigned int i = 0;
f (&i);
return 0;
}''',
args: ['-Werror'],
name : 'GCC size_t typedef is int'),
'long': g_sizet_compatibility['long'] and cc.compiles(
'''#include <stddef.h>
size_t f (size_t *i) { return *i + 1; }
int main (void) {
unsigned long i = 0;
f (&i);
return 0;
}''',
args: ['-Werror'],
name : 'GCC size_t typedef is long'),
'long long': g_sizet_compatibility['long long'] and cc.compiles(
'''#include <stddef.h>
size_t f (size_t *i) { return *i + 1; }
int main (void) {
unsigned long long i = 0;
f (&i);
return 0;
}''',
args: ['-Werror'],
name : 'GCC size_t typedef is long long'),
}
endif
if g_sizet_compatibility['short']
glibconfig_conf.set('glib_size_type_define', 'short')
glibconfig_conf.set_quoted('gsize_modifier', 'h')
glibconfig_conf.set_quoted('gssize_modifier', 'h')
glibconfig_conf.set_quoted('gsize_format', 'hu')
glibconfig_conf.set_quoted('gssize_format', 'hi')
glibconfig_conf.set('glib_msize_type', 'SHRT')
elif sizet_size == int_size
elif g_sizet_compatibility['int']
glibconfig_conf.set('glib_size_type_define', 'int')
glibconfig_conf.set_quoted('gsize_modifier', '')
glibconfig_conf.set_quoted('gssize_modifier', '')
glibconfig_conf.set_quoted('gsize_format', 'u')
glibconfig_conf.set_quoted('gssize_format', 'i')
glibconfig_conf.set('glib_msize_type', 'INT')
elif sizet_size == long_size
elif g_sizet_compatibility['long']
glibconfig_conf.set('glib_size_type_define', 'long')
glibconfig_conf.set_quoted('gsize_modifier', 'l')
glibconfig_conf.set_quoted('gssize_modifier', 'l')
glibconfig_conf.set_quoted('gsize_format', 'lu')
glibconfig_conf.set_quoted('gssize_format', 'li')
glibconfig_conf.set('glib_msize_type', 'LONG')
elif sizet_size == long_long_size
elif g_sizet_compatibility['long long']
glibconfig_conf.set('glib_size_type_define', 'long long')
glibconfig_conf.set_quoted('gsize_modifier', int64_m)
glibconfig_conf.set_quoted('gssize_modifier', int64_m)