PR fortran/95688 - ICE in gfc_get_string, at fortran/iresolve.c:70

With submodules, name mangling of character pointer declarations produces long
internal symbols that overflowed a static internal buffer.  Adjust the buffer
size.

gcc/fortran/
	PR fortran/95688
	* iresolve.c (gfc_get_string): Enlarge static buffer size.

(cherry picked from commit cd6546ac0e8fb2f4ff2a4bb2db2363ca02bdb7ba)

gcc/fortran/iresolve.c

@@ -47,8 +47,8 @@ along with GCC; see the file COPYING3.  If not see
 const char *
 gfc_get_string (const char *format, ...)
 {
-  /* Provide sufficient space to hold "_F.caf_token__symbol_MOD_symbol".  */
-  char temp_name[14 + GFC_MAX_SYMBOL_LEN + 5 + GFC_MAX_SYMBOL_LEN + 1];
+  /* Provide sufficient space to hold "_F.symbol.symbol_MOD_symbol".  */
+  char temp_name[4 + 2*GFC_MAX_SYMBOL_LEN + 5 + GFC_MAX_SYMBOL_LEN + 1];
   const char *str;
   va_list ap;
   tree ident;

gcc/testsuite/gfortran.dg/pr95688.f90

+! { dg-do compile }
+! { dg-options "-fsecond-underscore" }
+! PR fortran/95688 - ICE in gfc_get_string, at fortran/iresolve.c:70
+
+module m2345678901234567890123456789012345678901234567890123456789_123
+  interface
+     module subroutine s2345678901234567890123456789012345678901234567890123456789_123
+     end
+  end interface
+end
+submodule(m2345678901234567890123456789012345678901234567890123456789_123) &
+          n2345678901234567890123456789012345678901234567890123456789_123
+  character(:), pointer :: &
+          x2345678901234567890123456789012345678901234567890123456789_123 => null()
+end