gdb: Fix std::{min, max}-related build breakage on 32-bit hosts
authorPedro Alves <palves@redhat.com>
Sun, 18 Sep 2016 22:56:01 +0000 (23:56 +0100)
committerPedro Alves <palves@redhat.com>
Sun, 18 Sep 2016 22:56:01 +0000 (23:56 +0100)
commit768adc05c44c7e8b5c0f9ca5ad3ca96657715293
tree47c7bd49aa65a757a3b223767d86a3102fc8ca85
parent498f644143437511c10b0cb30479e528d32ea02b
gdb: Fix std::{min, max}-related build breakage on 32-bit hosts

Building on a 32-bit host fails currently with errors like:

  .../src/gdb/exec.c: In function ‘target_xfer_status section_table_read_available_memory(gdb_byte*, ULONGEST, ULONGEST, ULONGEST*)’:
  .../src/gdb/exec.c:801:54: error: no matching function for call to ‘min(ULONGEST, long unsigned int)’
      end = std::min (offset + len, r->start + r->length);
^
  In file included from /usr/include/c++/5.3.1/algorithm:61:0,
   from .../src/gdb/exec.c:46:
  /usr/include/c++/5.3.1/bits/stl_algobase.h:195:5: note: candidate: template<class _Tp> const _Tp& std::min(const _Tp&, const _Tp&)
       min(const _Tp& __a, const _Tp& __b)
       ^
  /usr/include/c++/5.3.1/bits/stl_algobase.h:195:5: note:   template argument deduction/substitution failed:
  .../src/gdb/exec.c:801:54: note:   deduced conflicting types for parameter ‘const _Tp’ (‘long long unsigned int’ and ‘long unsigned int’)
      end = std::min (offset + len, r->start + r->length);
^
  In file included from /usr/include/c++/5.3.1/algorithm:61:0,
   from .../src/gdb/exec.c:46:
  /usr/include/c++/5.3.1/bits/stl_algobase.h:243:5: note: candidate: template<class _Tp, class _Compare> const _Tp& std::min(const _Tp&, const _Tp&, _Compare)
       min(const _Tp& __a, const _Tp& __b, _Compare __comp)
       ^

The problem is that the std::min/std::max function templates use the
same type for both parameters.  When the argument types are different,
the compiler can't automatically deduce which template specialization
to pick from the arguments' types.

Fix that by specifying the specialization we want explicitly.

gdb/ChangeLog:
2016-09-18  Pedro Alves  <palves@redhat.com>

* breakpoint.c (hardware_watchpoint_inserted_in_range): Explicitly
specify the std:min/std::max specialization.
* exec.c (section_table_read_available_memory): Likewise.
* remote.c (remote_read_qxfer): Likewise.
* target.c (simple_verify_memory): Likewise.
gdb/ChangeLog
gdb/breakpoint.c
gdb/exec.c
gdb/remote.c
gdb/target.c