php7[01234].extension.decimal: Override decimal to allow use in PHP 7

[agj]

“decimal” is a PHP extension I added recently to Nixpkgs in this PR with the aid of @jtojnar. Here I patch it to make it work for PHP 7, as it requires the JSON extension which wasn't included in PHP until version 8. They also helped me get this working in issue #399.

This PR will have to wait until flake.lock is updated, though.

[agj]

Ugh, looks like it's breaking for PHP 7.0 through 7.3… I'll take a look.

[jtojnar]

Looking at

/build/decimal-1.5.0/php_decimal.c: In function 'php_decimal_register_class_handlers':
/build/decimal-1.5.0/php_decimal.c:2732:43: error: assignment to 'zend_object_write_property_t' {aka 'void (*)(struct _zval_struct *, struct _zval_struct *, struct _zval_struct *, void **)'} from incompatible pointer type 'zval * (*)(zval *, zval *, zval *, void **)' {aka 'struct _zval_struct * (*)(struct _zval_struct *, struct _zval_struct *, struct _zval_struct *, void **)'} []

It might need

nix-phps/pkgs/package-overrides.nix

Lines 1077 to 1081 in a0c563b

	env = mergeEnv attrs {
	NIX_CFLAGS_COMPILE = lib.optionals (lib.versionOlder prev.php.version "7.0") [
	"-Wno-incompatible-${lib.optionalString isClang "function-"}pointer-types"
	];
	};

for PHP 7.0 to 7.3 (inclusive).

[agj]

Thanks! There goes the change. Fingers crossed!

[drupol]

Thank you for this!