[gcc(refs/vendors/ARM/heads/arm-struct-reorg-wip)] PR fortran/95688 - ICE in gfc_get_string, at fortran/iresolve.c:70

[Tamar Christina]

https://gcc.gnu.org/g:905aaaa6a5f1874eb85c74e439c4058b1e5c936b

commit 905aaaa6a5f1874eb85c74e439c4058b1e5c936b
Author: Harald Anlauf <anlauf@gmx.de>
Date:   Sat Jun 20 16:14:00 2020 +0200

    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)

Diff:
---
 gcc/fortran/iresolve.c                |  4 ++--
 gcc/testsuite/gfortran.dg/pr95688.f90 | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/gcc/fortran/iresolve.c b/gcc/fortran/iresolve.c
index df4f2265c58..aa9bb328a0f 100644
--- a/gcc/fortran/iresolve.c
+++ b/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;
diff --git a/gcc/testsuite/gfortran.dg/pr95688.f90 b/gcc/testsuite/gfortran.dg/pr95688.f90
new file mode 100644
index 00000000000..ce8fd3e9890
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pr95688.f90
@@ -0,0 +1,15 @@
+! { 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