[PATCH 00/27] Teach the testsuite about the Windows/MSVC target

[Pedro Alves <pedro@palves.net>]

This series teaches the GDB testsuite about Windows targets whose
triplet uses the "windows" OS and the MSVC ABI, as produced by Clang
(e.g. x86_64-pc-windows-msvc), so that a MinGW-hosted GDB configured
with:

 --host=x86_64-w64-mingw32 --target=x86_64-pc-windows-msvc

can be exercised against a matching Clang.

This is how a Windows AMDGPU GDB should be tested, as the gdb.rocm/
testcases compile with such a Clang.

This builds on part 1, which teaches GDB proper about such targets:

  https://inbox.sourceware.org/gdb-patches/20260714004507.1323332-1-pedro@palves.net/T/
  [PATCH 0/4] Support the Windows/MSVC target in GDB

The bulk of the work is in the testsuite, plus a couple of GDB fixes
that testcases surfaced.

The patches fall into a few groups:

- Native "make check" for a differing host/target.

  A MinGW-hosted GDB targeting the MSVC ABI has host and target
  triplets that differ, but it is still a native configuration.  Two
  patches make plain "make check" (with no board file) largely Just
  Work there.  I usually combine this with CC_FOR_TARGET, but no need
  to point at objdump, objcopy, etc., etc...

- New istarget predicates.

  The testsuite is littered with hand-rolled istarget checks like
  "[istarget *-*-mingw*] || [istarget *-*-cygwin*]" that do not match
  windows-msvc.  This series introduces is_windows_native_target and
  is_pecoff_target in lib/gdb.exp, routes the existing checks through
  them, and then goes over individual testcases replacing the
  open-coded checks.

- Compile and link fixes for the windows-msvc toolchain.

  lld-link, the linker Clang drives on windows-msvc, is stricter than
  GNU ld: it rejects -fPIC, -Wl,--no-as-needed, --out-implib, and
  -Ttext-segment, exports no DLL symbols by default.

  There is no separate math library (-lm).

  A handful of patches make gdb_compile/gdb_compile_shlib do the right
  thing for the target: drop -lm, drop -fPIC on PE/COFF, restrict
  --no-as-needed to ELF, generate a .def to export all DLL symbols,
  use /IMPLIB for import libraries, and support the text_segment
  option via lld-link's /BASE.

- Along the way, a preexisting testsuite cygwin/mingw bug is fixed:

  -Ttext-segment was silently ignored by PE ld, so the image base was
  -never actually being set -- --image-base is the right flag there.

- MSVC C runtime differences.

  The MSVC CRT renders %p without a "0x" prefix and defaults to a
  statically-linked, single-threaded CRT.  A few patches switch the
  affected GDB printfs to host_address_to_string (so pointers always
  print "0x"-prefixed), and relax a testcase pattern that assumed a
  multi-threaded inferior at main.

- A GDB fix that a testcase surfaced - absolute symbols and relocations

  gdb/coffread.c currently incorrectly relocates COFF absolute symbols
  as if they belonged to the text section, so an absolute symbol in a
  relocated DLL comes out shifted by the load bias.

  gdb.base/shreloc.exp catches this on mingw/cygwin.  Funny enough,
  that part of the test can only run on those targets currently, so if
  e.g., Linux got it absolute symbols wrong we wouldn't notice.  The
  series tweaks that test to be able to run it on all targets.

- The dlopen/LoadLibrary shim scattered across several testcases is
  factored into a new lib/gdb-dlfcn.h, and its Windows guard switched
  from the MinGW-ism __WIN32__ to _WIN32 so it works with Clang
  targeting windows-msvc too.

Pedro Alves (27):
  gdb/testsuite: Don't link with -lm on windows-msvc
  gdb/testsuite: Use unprefixed runtest for a native Windows/MSVC build
  gdb/testsuite: Find host binutils in a native Windows/MSVC config
  gdb/testsuite: Compile with -Wno-deprecated-declarations on
    windows-msvc
  gdb/testsuite: Recognize windows-msvc across lib/gdb.exp procedures
  gdb/testsuite: Don't pass -fPIC on PE/COFF targets
  gdb/testsuite: Use /IMPLIB on windows-msvc to name import libraries
  gdb/testsuite: Export all DLL symbols on windows-msvc via generated
    .def
  gdb/testsuite: Restrict --no-as-needed to ELF targets
  gdb.base/set-cwd.exp: Use is_windows_native_target
  gdb.base/exitsignal.exp: Use is_windows_native_target
  gdb.base/exitsignal.exp: Relax SIGSEGV second-chance pattern
  gdb/testsuite: Skip -Ttext-segment on PE
  gdb/testsuite: Support text_segment on windows-msvc via /BASE
  gdb.base/shreloc.exp: Use gdb_compile text_segment to set image base
  gdb/coffread: Don't relocate absolute symbols
  gdb.base/shreloc.exp: Test absolute symbols portably
  gdb: %p => host_address_to_string, target-section owner token
  gdb: %p => host_address_to_string, dump_for_expression
  gdb: %p => host_address_to_string, find_symtab_matching_filename
  gdb: %p => host_address_to_string, handle_output_debug_string
  gdb.base/maint-info-sections.exp: Match exec file name with optional
    .exe
  gdb.base/maint-info-sections.exp: Remove stale Windows DATA xfail
  gdb.base/solib-weak.exp: Skip on all PE/COFF targets
  gdb.server/wrapper.exp: Skip on all Windows targets
  gdb/testsuite: Factor out dlopen/LoadLibrary shim into lib/gdb-dlfcn.h
  gdb/testsuite/lib/gdb-dlfcn.h: __WIN32__ => _WIN32

 gdb/acinclude.m4                              |   3 +
 gdb/coffread.c                                |  23 +-
 gdb/configure                                 |  40 +--
 gdb/configure.ac                              |  23 +-
 gdb/expprint.c                                |   3 +-
 gdb/gdb-native.m4                             |  30 ++
 gdb/maint.c                                   |   4 +-
 gdb/symfile-debug.c                           |   4 +-
 gdb/testsuite/Makefile.in                     |   4 +-
 gdb/testsuite/aclocal.m4                      |   1 +
 gdb/testsuite/configure                       |  19 ++
 gdb/testsuite/configure.ac                    |   5 +
 gdb/testsuite/gdb.base/bp-disabled-by-cond.c  |  13 +-
 gdb/testsuite/gdb.base/catch-load.c           |   8 +-
 .../gdb.base/corefile-buildid-shlib.c         |  10 +-
 gdb/testsuite/gdb.base/exitsignal.exp         |   4 +-
 gdb/testsuite/gdb.base/jit-unload.c           |   9 +-
 .../gdb.base/maint-info-sections.exp          |  18 +-
 gdb/testsuite/gdb.base/set-cwd.exp            |   2 +-
 gdb/testsuite/gdb.base/shlib-unload.c         |  13 +-
 gdb/testsuite/gdb.base/shreloc.exp            |  31 +--
 gdb/testsuite/gdb.base/shreloc.h              |  33 +++
 gdb/testsuite/gdb.base/shreloc1.c             |   2 +
 gdb/testsuite/gdb.base/shreloc2.c             |   2 +
 gdb/testsuite/gdb.base/solib-disc.c           |  10 +-
 gdb/testsuite/gdb.base/solib-weak.exp         |  13 +-
 gdb/testsuite/gdb.base/unload.c               |  21 +-
 gdb/testsuite/gdb.base/watchpoint-solib.c     |  17 +-
 gdb/testsuite/gdb.mi/mi-catch-load.c          |   8 +-
 gdb/testsuite/gdb.mi/mi-dprintf-modified.c    |  13 +-
 gdb/testsuite/gdb.perf/solib.c                |   9 +-
 gdb/testsuite/gdb.python/py-event-load.c      |   8 +-
 gdb/testsuite/gdb.server/wrapper.exp          |   3 +-
 gdb/testsuite/lib/future.exp                  |  91 +++++--
 gdb/testsuite/lib/gdb-dlfcn.h                 |  51 ++++
 gdb/testsuite/lib/gdb.exp                     | 257 +++++++++++++-----
 gdb/windows-nat.c                             |   5 +-
 37 files changed, 508 insertions(+), 302 deletions(-)
 create mode 100644 gdb/gdb-native.m4
 create mode 100644 gdb/testsuite/gdb.base/shreloc.h
 create mode 100644 gdb/testsuite/lib/gdb-dlfcn.h


base-commit: 33f0797fff4dcac33092bfde19105c1eeb483526
prerequisite-patch-id: ed1cdd12fb2e8aff39333606bd7e09be908d38b2
prerequisite-patch-id: 2573abf27e64de02c68de290f396c180aab7f07c
prerequisite-patch-id: 4ad37c9dcc630915da81f129125a9db1ad21812d
prerequisite-patch-id: 77b8e6b2ee0b0d3b8db75cec33683b9e929dd241
prerequisite-patch-id: ba7de51d339a3bde1e3519679487861355826eef
-- 
2.54.0