Output errno on error (helps debugging)

Author: ddeclerck

.github/workflows/windows-msvc.yml

@@ -17,8 +17,8 @@ env:
   VCVARS64: C:\Program Files\Microsoft Visual Studio\2022\Enterprise\VC\Auxiliary\Build\vcvars64.bat
 
   VCPKG_ROOT: C:\vcpkg
-  VCPKGS32: mpir:x86-windows pdcurses:x86-windows berkeleydb:x86-windows libxml2:x86-windows cjson:x86-windows
-  VCPKGS64: mpir:x64-windows pdcurses:x64-windows berkeleydb:x64-windows libxml2:x64-windows cjson:x64-windows
+  VCPKGS32: mpir:x86-windows pdcurses:x86-windows berkeleydb:x86-windows libxml2:x86-windows cjson:x86-windows libiconv:x86-windows
+  VCPKGS64: mpir:x64-windows pdcurses:x64-windows berkeleydb:x64-windows libxml2:x64-windows cjson:x64-windows libiconv:x64-windows
 
   MSYS2_ROOT: C:\msys64
   MSYSTEM: UCRT64

cobc/gentable.c

@@ -87,8 +87,9 @@ gentable (FILE *stream, const char *code_ebcdic, const char *code_ascii, char re
 					--ascii_size;
 					++nb_irreversible;
 				} else {
-					cb_error (_("an error occurred after converting %ld characters"),
-							(ebcdic_ptr - ebcdic));
+					cb_error (_("an error occurred after converting %ld characters (%d, %ld)"),
+							(ebcdic_ptr - ebcdic),
+							errno, res);
 					iconv_close (ic);
 					return -1;
 				}