MAINT: Update meson build infrastructure. (numpy#25049)

Backports of numpy#24969, numpy#24979, numpy#24968, numpy#25068.

* apply 24969.diff

* apply 24979.diff

* apply 24968.diff

* TST: skip flaky test in test_histogram

---------

Co-authored-by: mattip <matti.picus@gmail.com>

Author: charris

numpy/core/include/numpy/npy_common.h

@@ -168,6 +168,9 @@
     #define npy_ftell ftell
 #endif
     #include <sys/types.h>
+    #ifndef _WIN32
+        #include <unistd.h>
+    #endif
     #define npy_lseek lseek
     #define npy_off_t off_t
 

numpy/core/meson.build

@@ -257,37 +257,6 @@ foreach filefunc_maybe: optional_file_funcs
   endif
 endforeach
 
-# Optional locale function
-have_strtold_l = cc.has_function('strtold_l', include_directories: inc_curdir,
-  prefix:'''
-  #include <stdlib.h>
-  #include <xlocale.h>
-  #include "feature_detection_locale.h"
-''')
-if not have_strtold_l
-  # Retry with locale.h, seems to vary across Linux distros
-  have_strtold_l = cc.has_function('strtold_l', include_directories: inc_curdir,
-    prefix:'''
-    #include <stdlib.h>
-    #include <locale.h>
-    #include "feature_detection_locale.h"
-  ''')
-endif
-if have_strtold_l
-  cdata.set10('HAVE_STRTOLD_L', true)
-else
-  # FIXME: this is wrong! the HAVE_ define should not exist, or it'll be
-  # interpreted as the function being available (true/false does nothing, see
-  # note on HAVE_ defines higher up). This is necessary though in order to make
-  # the Linux CI job pass. So either the check is wrong somehow, or this
-  # function is not available in CI. For the latter there is a fallback path,
-  # but that is broken because we don't have the exact long double
-  # representation checks.
-  if cc.get_argument_syntax() != 'msvc'
-    cdata.set10('HAVE_STRTOLD_L', false)
-  endif
-endif
-
 # Other optional functions
 optional_misc_funcs = [
   'backtrace',
@@ -305,7 +274,7 @@ endforeach
 # SSE headers only enabled automatically on amd64/x32 builds
 optional_headers = [
   'features.h',   # for glibc version linux
-  'xlocale.h',    # see GH#8367
+  'xlocale.h',    # removed in glibc 2.26, but may still be useful - see gh-8367
   'dlfcn.h',      # dladdr
   'execinfo.h',   # backtrace
   'libunwind.h',  # backtrace for LLVM/Clang using libunwind
@@ -317,6 +286,19 @@ foreach header: optional_headers
   endif
 endforeach
 
+# Optional locale function - GNU-specific
+_strtold_prefix = '''
+#define _GNU_SOURCE
+#include <locale.h>
+#include <stdlib.h>
+'''
+if cdata.get('HAVE_XLOCALE_H', 0) == 1
+  _strtold_prefix += '#include <xlocale.h>'
+endif
+if cc.has_function('strtold_l', include_directories: inc_curdir, prefix: _strtold_prefix)
+  cdata.set10('HAVE_STRTOLD_L', true)
+endif
+
 # Optional compiler attributes
 # TODO: this doesn't work with cc.has_function_attribute, see
 #       https://github.com/mesonbuild/meson/issues/10732

numpy/core/src/common/numpyos.c

@@ -11,6 +11,9 @@
 
 #include "npy_pycompat.h"
 
+#if defined(HAVE_STRTOLD_L) && !defined(_GNU_SOURCE)
+# define _GNU_SOURCE
+#endif
 #include <locale.h>
 #include <stdio.h>
 

numpy/lib/tests/test_histograms.py

@@ -398,8 +398,9 @@ def test_histogram_bin_edges(self):
         edges = histogram_bin_edges(arr, bins='auto', range=(0, 1))
         assert_array_equal(edges, e)
 
-    @requires_memory(free_bytes=1e10)
-    @pytest.mark.slow
+    # @requires_memory(free_bytes=1e10)
+    # @pytest.mark.slow
+    @pytest.mark.skip(reason="Bad memory reports lead to OOM in ci testing")
     def test_big_arrays(self):
         sample = np.zeros([100000000, 3])
         xbins = 400

numpy/meson.build

@@ -10,15 +10,20 @@ endif
 
 # Platform detection
 is_windows = host_machine.system() == 'windows'
-is_mingw = is_windows and cc.get_id() == 'gcc'
+is_mingw = is_windows and cc.get_define('__MINGW32__') != ''
 
 if is_mingw
-  # For mingw-w64, link statically against the UCRT.
-  gcc_link_args = ['-lucrt', '-static']
-  add_project_link_arguments(gcc_link_args, language: ['c', 'cpp'])
-  # Force gcc to float64 long doubles for compatibility with MSVC
-  # builds, for C only.
-  add_project_arguments('-mlong-double-64', language: 'c')
+  is_mingw_built_python = run_command(
+    py, ['-c', 'import sysconfig; print(sysconfig.get_platform())'],
+    check: true).stdout().strip().startswith('mingw')
+  if not is_mingw_built_python
+    # For mingw-w64, link statically against the UCRT.
+    gcc_link_args = ['-lucrt', '-static']
+    add_project_link_arguments(gcc_link_args, language: ['c', 'cpp'])
+    # Force gcc to float64 long doubles for compatibility with MSVC
+    # builds, for C only.
+    add_project_arguments('-mlong-double-64', language: 'c')
+  endif
   # Make fprintf("%zd") work (see https://github.com/rgommers/scipy/issues/118)
   add_project_arguments('-D__USE_MINGW_ANSI_STDIO=1', language: ['c', 'cpp'])
 endif