When building of modules is disabled, build the legacy provider into libcrypto

This makes the legacy provider available regardless of building conditions.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9637)

Configure

@@ -518,7 +518,7 @@ my @disable_cascades = (
     # or modules.
     "pic"               => [ "shared", "module" ],
 
-    "module"            => [ "fips", "legacy" ],
+    "module"            => [ "fips" ],
 
     "engine"            => [ grep /eng$/, @disablables ],
     "hw"                => [ "padlockeng" ],

crypto/provider_predefined.c

@@ -12,12 +12,17 @@
 
 OSSL_provider_init_fn ossl_default_provider_init;
 OSSL_provider_init_fn fips_intern_provider_init;
-
+#ifdef STATIC_LEGACY
+OSSL_provider_init_fn ossl_legacy_provider_init;
+#endif
 const struct predefined_providers_st predefined_providers[] = {
 #ifdef FIPS_MODE
     { "fips", fips_intern_provider_init, 1 },
 #else
     { "default", ossl_default_provider_init, 1 },
+# ifdef STATIC_LEGACY
+    { "legacy", ossl_legacy_provider_init, 0 },
+# endif
 #endif
     { NULL, NULL, 0 }
 };

providers/build.info

@@ -15,11 +15,16 @@ ENDIF
 
 IF[{- !$disabled{legacy} -}]
   SUBDIRS=legacy
-  MODULES=legacy
-  IF[{- defined $target{shared_defflag} -}]
-    SOURCE[legacy]=legacy.ld
-    GENERATE[legacy.ld]=../util/providers.num
+  IF[{- $disabled{module} -}]
+    LIBS=../libcrypto
+    DEFINE[../libcrypto]=STATIC_LEGACY
+  ELSE
+    MODULES=legacy
+    IF[{- defined $target{shared_defflag} -}]
+      SOURCE[legacy]=legacy.ld
+      GENERATE[legacy.ld]=../util/providers.num
+    ENDIF
+    DEPEND[legacy]=../libcrypto
+    INCLUDE[legacy]=.. ../include ../crypto/include common/include
   ENDIF
-  INCLUDE[legacy]=.. ../include ../crypto/include common/include
-  DEPEND[legacy]=../libcrypto
 ENDIF

providers/legacy/build.info

@@ -1,4 +1,8 @@
 SUBDIRS=digests
+IF[{- $disabled{module} -}]
+  $GOAL=../../libcrypto
+ELSE
+  $GOAL=../legacy
+ENDIF
 
-SOURCE[../legacy]=\
-        legacyprov.c
+SOURCE[$GOAL]=legacyprov.c

providers/legacy/digests/build.info

@@ -1,24 +1,30 @@
+IF[{- $disabled{module} -}]
+  $GOAL=../../../libcrypto
+ELSE
+  $GOAL=../../legacy
+ENDIF
+
 IF[{- !$disabled{md2} -}]
-  SOURCE[../../legacy]=\
+  SOURCE[$GOAL]=\
           md2_prov.c
 ENDIF
 
 IF[{- !$disabled{md4} -}]
-  SOURCE[../../legacy]=\
+  SOURCE[$GOAL]=\
           md4_prov.c
 ENDIF
 
 IF[{- !$disabled{mdc2} -}]
-  SOURCE[../../legacy]=\
+  SOURCE[$GOAL]=\
           mdc2_prov.c
 ENDIF
 
 IF[{- !$disabled{whirlpool} -}]
-  SOURCE[../../legacy]=\
+  SOURCE[$GOAL]=\
           wp_prov.c
 ENDIF
 
 IF[{- !$disabled{rmd160} -}]
-  SOURCE[../../legacy]=\
+  SOURCE[$GOAL]=\
           ripemd_prov.c
 ENDIF

providers/legacy/legacyprov.c

@@ -15,6 +15,11 @@
 #include <openssl/params.h>
 #include "internal/provider_algs.h"
 
+#ifdef STATIC_LEGACY
+OSSL_provider_init_fn ossl_legacy_provider_init;
+# define OSSL_provider_init ossl_legacy_provider_init
+#endif
+
 /* Functions provided by the core */
 static OSSL_core_gettable_params_fn *c_gettable_params = NULL;
 static OSSL_core_get_params_fn *c_get_params = NULL;