Drop support for GMP 4.1

 * Consistent base conversion support (max: 62)
 * mpz_remroot always available
 * Use gmp_randinit_mt instead of LCG

Author: nikic

Diff for: UPGRADING

@@ -35,6 +35,7 @@ PHP X.Y UPGRADE NOTES
     handler, too.
 
 - GMP
+  . Requires libgmp version 4.2 or newer now.
   . gmp_setbit() and gmp_clrbit() now return FALSE for negative indices, making
     them consistent with other GMP functions.
 

Diff for: ext/gmp/config.m4

@@ -1,7 +1,3 @@
-dnl
-dnl $Id$
-dnl
-
 PHP_ARG_WITH(gmp, for GNU MP support,
 [  --with-gmp[=DIR]          Include GNU MP support])
 
@@ -15,14 +11,9 @@ if test "$PHP_GMP" != "no"; then
     AC_MSG_ERROR(Unable to locate gmp.h)
   fi
 
-  PHP_CHECK_LIBRARY(gmp, __gmp_randinit_lc_2exp_size,
+  PHP_CHECK_LIBRARY(gmp, __gmpz_rootrem,
   [],[
-    PHP_CHECK_LIBRARY(gmp, gmp_randinit_lc_2exp_size,
-    [],[
-      AC_MSG_ERROR([GNU MP Library version 4.1.2 or greater required.])
-    ],[
-      -L$GMP_DIR/$PHP_LIBDIR
-    ])
+    AC_MSG_ERROR([GNU MP Library version 4.2 or greater required.])
   ],[
     -L$GMP_DIR/$PHP_LIBDIR
   ])

Diff for: ext/gmp/gmp.c

@@ -224,16 +224,7 @@ typedef struct _gmp_temp {
 #define GMP_BIG_ENDIAN    (1 << 3)
 #define GMP_NATIVE_ENDIAN (1 << 4)
 
-#define GMP_42_OR_NEWER \
-	((__GNU_MP_VERSION >= 5) || (__GNU_MP_VERSION >= 4 && __GNU_MP_VERSION_MINOR >= 2))
-
-/* The maximum base for input and output conversions is 62 from GMP 4.2
- * onwards. */
-#if GMP_42_OR_NEWER
-#	define MAX_BASE 62
-#else
-#	define MAX_BASE 36
-#endif
+#define GMP_MAX_BASE 62
 
 #define IS_GMP(zval) \
 	(Z_TYPE_P(zval) == IS_OBJECT && instanceof_function(Z_OBJCE_P(zval), gmp_ce TSRMLS_CC))
@@ -1048,8 +1039,8 @@ ZEND_FUNCTION(gmp_init)
 		return;
 	}
 
-	if (base && (base < 2 || base > MAX_BASE)) {
-		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Bad base for conversion: %pd (should be between 2 and %d)", base, MAX_BASE);
+	if (base && (base < 2 || base > GMP_MAX_BASE)) {
+		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Bad base for conversion: %pd (should be between 2 and %d)", base, GMP_MAX_BASE);
 		RETURN_FALSE;
 	}
 
@@ -1204,15 +1195,10 @@ ZEND_FUNCTION(gmp_strval)
 		return;
 	}
 
-#if MAX_BASE == 62
-	/* Although the maximum base in general in GMP >= 4.2 is 62, mpz_get_str()
+	/* Although the maximum base in general in GMP is 62, mpz_get_str()
 	 * is explicitly limited to -36 when dealing with negative bases. */
-	if ((base < 2 && base > -2) || base > MAX_BASE || base < -36) {
-		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Bad base for conversion: %pd (should be between 2 and %d or -2 and -36)", base, MAX_BASE);
-#else
-	if (base < 2 || base > MAX_BASE) {
-		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Bad base for conversion: %pd (should be between 2 and %d)", base, MAX_BASE);
-#endif
+	if ((base < 2 && base > -2) || base > GMP_MAX_BASE || base < -36) {
+		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Bad base for conversion: %pd (should be between 2 and %d or -2 and -36)", base, GMP_MAX_BASE);
 		RETURN_FALSE;
 	}
 
@@ -1596,14 +1582,7 @@ ZEND_FUNCTION(gmp_rootrem)
 	add_next_index_zval(return_value, &result1);
 	add_next_index_zval(return_value, &result2);
 
-#if GMP_42_OR_NEWER
 	mpz_rootrem(gmpnum_result1, gmpnum_result2, gmpnum_a, (gmp_ulong) nth);
-#else
-	mpz_root(gmpnum_result1, gmpnum_a, (gmp_ulong) nth);
-	mpz_pow_ui(gmpnum_result2, gmpnum_result1, (gmp_ulong) nth);
-	mpz_sub(gmpnum_result2, gmpnum_a, gmpnum_result2);
-	mpz_abs(gmpnum_result2, gmpnum_result2);
-#endif
 
 	FREE_GMP_TEMP(temp_a);
 }
@@ -1779,7 +1758,7 @@ ZEND_FUNCTION(gmp_random)
 
 	if (!GMPG(rand_initialized)) {
 		/* Initialize */
-		gmp_randinit_lc_2exp_size(GMPG(rand_state), 32L);
+		gmp_randinit_mt(GMPG(rand_state));
 
 		/* Seed */
 		gmp_randseed_ui(GMPG(rand_state), GENERATE_SEED());

Diff for: ext/gmp/tests/bug50283.phpt

@@ -2,7 +2,6 @@
 Feature Request #50283 (allow base in gmp_strval to use full range: 2 to 62, and -2 to -36)
 --SKIPIF--
 <?php if (!extension_loaded("gmp")) print "skip"; ?>
-<?php if (version_compare(GMP_VERSION, "4.2.0", "<")) print "skip"; ?>
 --FILE--
 <?php
 $a = gmp_init("0x41682179fbf5");