[BUG]: Build error: PHP 7.4 with Phalcon 4.2 and Zephir 0.15.2

[temuri416]

Ubuntu 20.04, PHP 7.4 with Phalcon 4.2 and Zephir 0.15.2:

Command:

git clone -b 4.2.x https://github.com/phalcon/cphalcon.git && cd cphalcon && wget http://github.com/phalcon/zephir/releases/download/0.15.2/zephir.phar && chmod +x zephir.phar && mv zephir.phar /usr/sbin && zephir.phar fullclean && zephir.phar build

Result:

Cleaning old kernel files...
 Copying new kernel files...
 Preparing for PHP compilation...
 Preparing configuration file...
 Compiling...
 Zephir version has changed, use "zephir fullclean" to perform a full clean of the project
 Installing...


 [ERROR] Internal extension compilation failed. Check compile-errors.log for more information.
compile-errors:

/root/install/cphalcon/ext/kernel/main.c: In function ‘zephir_function_exists’:
/root/install/cphalcon/ext/kernel/main.c:285:101: warning: comparison between pointer and integer
  285 |  if (zend_hash_str_exists(CG(function_table), Z_STRVAL_P(function_name), Z_STRLEN_P(function_name)) != NULL) {
/root/install/cphalcon/ext/kernel/main.c: In function ‘zephir_function_exists_ex’:
/root/install/cphalcon/ext/kernel/main.c:301:76: warning: comparison between pointer and integer
  301 |  if (zend_hash_str_exists(CG(function_table), function_name, function_len) != NULL) {
/root/install/cphalcon/ext/phalcon/storage/adapter/redis.zep.c: In function ‘zim_Phalcon_Storage_Adapter_Redis_getAdapter’:
/root/install/cphalcon/ext/phalcon/storage/adapter/redis.zep.c:385:31: error: ‘ce’ undeclared (first use in this function)
  385 |   object_init_ex(&connection, ce);
/root/install/cphalcon/ext/phalcon/storage/adapter/redis.zep.c:385:31: note: each undeclared identifier is reported only once for each function it appears in
/root/install/cphalcon/ext/phalcon/storage/adapter/redis.zep.c: In function ‘zim_Phalcon_Storage_Adapter_Redis_getAdapter’:
/root/install/cphalcon/ext/phalcon/storage/adapter/redis.zep.c:385:31: error: ‘ce’ undeclared (first use in this function)
  385 |   object_init_ex(&connection, ce);
      |                               ^~~~
/root/install/cphalcon/ext/phalcon/storage/adapter/redis.zep.c:385:31: note: each undeclared identifier is reported only once for each function it appears in
make: *** [Makefile:534: phalcon/storage/adapter/redis.lo] Error 1

[Jeckerson]

Try to use 0.12.21 Zephir version - https://github.com/zephir-lang/zephir/releases/tag/0.12.21

Also, note that v4.x is legacy version which we do not provide further support, try to upgrade to Phalcon v5 ASAP.