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build-sys: meson: Add atomic ops related checks

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This commit is contained in:
Arun Raghavan 2019-08-15 13:07:54 +05:30
parent 25308fe88f
commit 1e996445f7
7 changed files with 61 additions and 8 deletions
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53
meson.build
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@ -371,12 +371,23 @@ size_t iconv (iconv_t cd, char * *inbuf, size_t *inbytesleft, char * *outbuf, si
endif
endif
# Atomic operations
if get_option('atomic-arm-memory-barrier')
cdata.set('ATOMIC_ARM_MEMORY_BARRIER_ENABLED', 1)
endif
need_libatomic_ops = false
atomictest = '''void func() {
volatile int atomic = 2;
__sync_bool_compare_and_swap (&atomic, 2, 3);
}
'''
if cc.compiles(atomictest)
cdata.set('HAVE_ATOMIC_BUILTINS', 1)
newatomictest = '''void func() {
int c = 0;
__atomic_store_n(&c, 4, __ATOMIC_SEQ_CST);
@ -384,12 +395,48 @@ if cc.compiles(atomictest)
'''
if(cc.compiles(newatomictest))
cdata.set('HAVE_ATOMIC_BUILTINS_MEMORY_MODEL', true)
cdata.set('HAVE_ATOMIC_BUILTINS_MEMORY_MODEL', 1)
endif
cdata.set('HAVE_ATOMIC_BUILTINS', true)
elif host_machine.cpu_family() == 'arm'
if host_machine.system() == 'linux' and get_option('atomic-arm-linux-helpers')
cdata.set('ATOMIC_ARM_LINUX_HELPERS', 1)
else
armatomictest = '''void func() {
volatile int a=0;
int o=0, n=1, r;
asm volatile ("ldrex %0, [%1]\n"
"subs %0, %0, %2\n"
"strexeq %0, %3, [%1]\n"
: "=&r" (r)
: "r" (&a), "Ir" (o), "r" (n)
: "cc");
return (a==1 ? 0 : -1);
'''
if cc.compiles(aratomictest)
cdata.set('ATOMIC_ARM_INLINE_ASM', 1)
else
need_libatomic_ops = true
endif
endif # arm && !linux
elif not ['freebsd', 'netbsd'].contains(host_machine.system())
need_libatomic_ops = true
endif # !atomic helpers && !arm
if need_libatomic_ops
assert(cc.has_header('atomic_ops.h'), 'Need libatomic_ops')
cdata.set('AO_REQUIRE_CAS', 1)
if host_machine.system() != 'windows'
libatomic_ops_dep = cc.find_library('atomic_ops', required : true)
else
libatomic_ops_dep = dependency('', required: false)
endif
else
# FIXME: check if we need libatomic_ops
libatomic_ops_dep = dependency('', required: false)
endif
# FIXME: make sure it's >= 2.2