def test_emcc_multiprocess_cache_access(self):
restore_and_set_up()
create_file(
'test.c', r'''
#include <stdio.h>
int main() {
printf("hello, world!\n");
return 0;
}
''')
cache_dir_name = self.in_dir('test_cache')
libname = Cache.get_lib_name('libc.a')
with env_modify({'EM_CACHE': cache_dir_name}):
tasks = []
num_times_libc_was_built = 0
for i in range(3):
p = self.run_process(
[EMCC, 'test.c', '-o', '%d.js' % i],
stderr=STDOUT,
stdout=PIPE)
tasks += [p]
for p in tasks:
print('stdout:\n', p.stdout)
if 'generating system library: ' + libname in p.stdout:
num_times_libc_was_built += 1
# The cache directory must exist after the build
self.assertExists(cache_dir_name)
# The cache directory must contain a built libc
self.assertExists(os.path.join(cache_dir_name, libname))
# Exactly one child process should have triggered libc build!
self.assertEqual(num_times_libc_was_built, 1)
def test_emcc_caching(self):
BUILDING_MESSAGE = 'generating system library: %s'
restore_and_set_up()
self.clear_cache()
# Building a file that *does* need something *should* trigger cache
# generation, but only the first time
libname = Cache.get_lib_name('libc++.a')
for i in range(3):
print(i)
self.clear()
output = self.do([EMCC, '-O' + str(i), path_from_root('tests', 'hello_libcxx.cpp'), '-s', 'DISABLE_EXCEPTION_CATCHING=0'])
print('\n\n\n', output)
self.assertContainedIf(BUILDING_MESSAGE % libname, output, i == 0)
self.assertContained('hello, world!', self.run_js('a.out.js'))
self.assertExists(Cache.dirname)
self.assertExists(os.path.join(Cache.dirname, libname))
