Add well-considered patches for all compiler warnings

libIDL-0.8.14-lexer-sscanf-type-punning.patch

@@ -0,0 +1,36 @@
+diff -Naur libIDL-0.8.14-original/lexer.l libIDL-0.8.14/lexer.l
+--- libIDL-0.8.14-original/lexer.l	2009-04-18 08:20:37.000000000 -0400
++++ libIDL-0.8.14/lexer.l	2021-02-03 12:56:01.237822569 -0500
+@@ -269,17 +269,29 @@
+ <*>{whitespace}						;
+ {b8_int}						{
+ 	yylval.integer = 0;
+-	sscanf (yytext, "%" IDL_LL "o", &yylval.integer);
++        {
++        	long long unsigned yyltmp = 0;
++		sscanf (yytext, "%" IDL_LL "o", &yyltmp);
++		memmove (&yylval.integer, &yyltmp, sizeof (yylval.integer));
++	}
+ 	tokreturn (TOK_INTEGER);
+ }
+ {b10_uint}						{
+ 	yylval.integer = 0;
+-	sscanf (yytext, "%" IDL_LL "u", &yylval.integer);
++        {
++        	long long unsigned yyltmp = 0;
++		sscanf (yytext, "%" IDL_LL "u", &yyltmp);
++		memmove (&yylval.integer, &yyltmp, sizeof (yylval.integer));
++	}
+ 	tokreturn (TOK_INTEGER);
+ }
+ {b16_int}						{
+ 	yylval.integer = 0;
+-	sscanf (yytext + 2, "%" IDL_LL "x", &yylval.integer);
++        {
++        	long long unsigned yyltmp = 0;
++		sscanf (yytext + 2, "%" IDL_LL "x", &yyltmp);
++		memmove (&yylval.integer, &yyltmp, sizeof (yylval.integer));
++	}
+ 	tokreturn (TOK_INTEGER);
+ }
+ {fixed_lit}						{

libIDL-0.8.14-long-long-format-warnings.patch

@@ -17,3 +17,15 @@ diff -Naur libIDL-0.8.14-original/parser.y libIDL-0.8.14/parser.y
  		if (ident)
  			IDL_tree_warning (ident,
  					  IDL_WARNING1, "From constant declared here");
+diff -Naur libIDL-0.8.14-original/util.c libIDL-0.8.14/util.c
+--- libIDL-0.8.14-original/util.c	2009-04-18 08:20:37.000000000 -0400
++++ libIDL-0.8.14/util.c	2021-02-03 12:42:13.641470825 -0500
+@@ -2818,7 +2818,7 @@
+ 
+ 	case IDLN_INTEGER:
+ 		/* FIXME: sign */
+-		dataf (data, "%" IDL_LL "d", IDL_INTEGER (p).value);
++		dataf (data, "%" IDL_LL "d", (long long) IDL_INTEGER (p).value);
+ 		break;
+ 
+ 	case IDLN_FIXED:

libIDL-0.8.14-parser-primary_expr-unused-parent-node.patch

@@ -0,0 +1,16 @@
+diff -Naur libIDL-0.8.14-original/parser.y libIDL-0.8.14/parser.y
+--- libIDL-0.8.14-original/parser.y	2009-04-18 08:20:37.000000000 -0400
++++ libIDL-0.8.14/parser.y	2021-02-03 12:44:47.638466666 -0500
+@@ -898,11 +898,9 @@
+ 	;
+ 
+ primary_expr:		scoped_name			{
+-	IDL_tree p, literal;
++	IDL_tree literal;
+ 	
+ 	assert (IDL_NODE_TYPE ($1) == IDLN_IDENT);
+-
+-	p = IDL_NODE_UP ($1);
+ 	
+ 	if ((literal = IDL_resolve_const_exp ($1, IDLN_ANY))) {
+ 		++IDL_NODE_REFS (literal);

libIDL.spec

@@ -16,13 +16,21 @@ License:        LGPLv2+
 # Fix paths reported by the libIDL-config-2 tool to conform with Fedora
 # multilib installation paths:
 Patch0:         %{name}-0.8.6-multilib.patch
+# Remove an unused parent-node variable in the primary_expr part of the parser,
+# which caused a compiler warning.
+Patch1:         %{name}-0.8.14-parser-primary_expr-unused-parent-node.patch
 # On platforms (such as 64-bit Linux), where long long int and long int are
 # both 64-bit, we can have IDL_LL defined to ll (format with %%lld) while
 # IDL_longlong_t, which is just gint64, may be ultimately defined to long int.
 # This results in compiler warnings about the mismatch between the long long
 # format and long parameter, even though the types are compatible. We can fix
 # this with a cast to (long long) before formatting.
-Patch1:         %{name}-0.8.14-long-long-format-warnings.patch
+Patch2:         %{name}-0.8.14-long-long-format-warnings.patch
+# Instead of type-punning with sscanf, parse into a temporary with a type
+# matching the format code and then memmove into the “integer” storage. This is
+# no less platform-dependent, but does not invoke undefined behavior or produce
+# a compiler warning.
+Patch3:         %{name}-0.8.14-lexer-sscanf-type-punning.patch
 
 BuildRequires:  gcc
 BuildRequires:  make
@@ -98,7 +106,7 @@ rm '%{buildroot}%{_libdir}/%{name}-2.la'
 - Drop obsolete %%ldconfig_scriptlets macro
 - Use much stricter path globs
 - Use %%name macro
-- Patch long long format warnings
+- Add well-considered patches for all compiler warnings
 
 * Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.8.14-23
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild