0001-Support-for-AIX-meson-updates.pg19.patch

diff --git a/meson.build b/meson.build
index 304a9184075..6ba24187d15 100644
--- a/meson.build
+++ b/meson.build
@@ -215,15 +215,16 @@ elif host_system == 'aix'
   mod_link_with_dir = 'libdir'
   mod_link_with_name = '@0@.imp'
   dl_suffix = '.a'
-  cppflags += '-D_GNU_SOURCE'
+  # This flag is required to make sure the user spefic float.h is
+  # picked instead of the system float.h header file, which doesnot
+  # have definition like float8, etc
+  cflags += '-D_H_FLOAT'
 
   # M:SRE sets a flag indicating that an object is a shared library. Seems to
   # work in some circumstances without, but required in others.
   ldflags_sl += '-Wl,-bM:SRE'
   ldflags_be += '-Wl,-brtllib'
 
-  # Native memset() is faster, tested on:
-  memset_loop_limit = 0
 
 elif host_system == 'darwin'
   dlsuffix = '.dylib'
@@ -1784,10 +1785,49 @@ endforeach
 # as long, char, short, or int.  Note that we intentionally do not consider
 # any types wider than 64 bits, as allowing MAXIMUM_ALIGNOF to exceed 8
 # would be too much of a penalty for disk and memory space.
-alignof_double = cdata.get('ALIGNOF_DOUBLE')
-#if cc.alignment('int64_t', args: test_c_args, prefix: '#include <stdint.h>') > alignof_double
-#  error('alignment of int64_t is greater than the alignment of double')
-#endif
+if host_system != 'aix'
+  alignof_double = cdata.get('ALIGNOF_DOUBLE')
+  if cc.alignment('int64_t', args: test_c_args, prefix: '#include <stdint.h>') > alignof_double
+       error('alignment of int64_t is greater than the alignment of double')
+  endif
+else
+  # The AIX 'power' alignment rules apply the natural alignment of the "first
+  # member" if it is of a floating-point data type (or is an aggregate whose
+  # recursively "first" member or element is such a type). The alignment
+  # associated with these types for subsequent members use an alignment value
+  # where the floating-point data type is considered to have 4-byte alignment.
+  # More info
+  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99557
+  #
+  # The double is aligned to 4-bytes on AIX in aggregates. But to maintain
+  # alignement across platforms the max alignment of long should be considered.
+
+  # Get the alignment values
+  ac_cv_alignof_long    = cc.alignment('long', args: test_c_args, prefix: '#include <stdint.h>')
+  ac_cv_alignof_double  = cc.alignment('double', args: test_c_args, prefix: '#include <stdint.h>') 
+  ac_cv_alignof_int64_t = cc.alignment('int64_t', args: test_c_args, prefix: '#include <stdint.h>')
+ 
+  message('Alignment of long    : @0@'.format(ac_cv_alignof_long))
+  message('Alignment of double  : @0@'.format(ac_cv_alignof_double))
+  message('Alignment of int64_t : @0@'.format(ac_cv_alignof_int64_t))
+  
+  # Start with long
+  alignof_double = ac_cv_alignof_long
+  message('MAX ALIGN ac_cv_alignof_long')
+
+  # Compare with double
+  if alignof_double < ac_cv_alignof_double
+    alignof_double = ac_cv_alignof_double
+    message('MAX ALIGN ac_cv_alignof_double')
+  endif
+
+  # Compare with int64_t
+  if alignof_double < ac_cv_alignof_int64_t
+    alignof_double = ac_cv_alignof_int64_t
+    message('MAX ALIGN ac_cv_alignof_int64_t')
+  endif
+endif
+message('MAX ALIGN OF DOUBLE : @0@'.format(alignof_double))
 cdata.set('MAXIMUM_ALIGNOF', alignof_double)
 
 cdata.set('SIZEOF_LONG', cc.sizeof('long', args: test_c_args))
@@ -1839,7 +1879,7 @@ if cc.links('''
   if not meson.is_cross_build()
     r = cc.run('''
     /* This must match the corresponding code in c.h: */
-    #if defined(__GNUC__) || defined(__IBMC__)
+    #if defined(__GNUC__)
     #define pg_attribute_aligned(a) __attribute__((aligned(a)))
     #elif defined(_MSC_VER)
     #define pg_attribute_aligned(a) __declspec(align(a))
@@ -3485,13 +3525,17 @@ endif
 installed_targets = [
   backend_targets,
   bin_targets,
-  libpq_st,
   pl_targets,
   contrib_targets,
   nls_mo_targets,
   ecpg_targets,
 ]
 
+# The static libpq is skipped in AIX. This is not required.
+if host_system != 'aix'
+  installed_targets += [libpq_st]
+endif
+
 if oauth_flow_supported
   installed_targets += [
     libpq_oauth_so,
@@ -3835,7 +3879,13 @@ add_test_setup('running',
 ###############################################################
 
 alias_target('backend', backend_targets)
-alias_target('bin', bin_targets + [libpq_st])
+if host_system != 'aix'
+  alias_target('bin', bin_targets + [libpq_st])
+else
+  # The static libpq is skipped in AIX. This is not required.
+  alias_target('bin', bin_targets)
+endif
+
 alias_target('pl', pl_targets)
 alias_target('contrib', contrib_targets)
 alias_target('testprep', testprep_targets)
diff --git a/src/include/port/aix.h b/src/include/port/aix.h
index dd7cfb197cd..c86983a4452 100644
--- a/src/include/port/aix.h
+++ b/src/include/port/aix.h
@@ -1,26 +1,3 @@
 /*
  * src/include/port/aix.h
  */
-
-/* This change is required for the meson changes as the autoconf is not run and
- * to resolve the conflicts in picking the float.h details by default from the
- * postgres defined datatypes.
- */
-#ifdef _AIX
-#ifndef PGDLLIMPORT
-#define PGDLLIMPORT
-#endif  /* PGDLLIMPORT */
-typedef float float4;
-typedef double float8;
-
-#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
-#define pg_noreturn _Noreturn
-#elif defined(__GNUC__)
-#define pg_noreturn __attribute__((noreturn))
-#else
-#define pg_noreturn
-#endif
-
-#include <stdbool.h>
-
-#endif  /*_AIX */
diff --git a/src/interfaces/ecpg/compatlib/meson.build b/src/interfaces/ecpg/compatlib/meson.build
index 3f39187cdcc..af96e375a9b 100644
--- a/src/interfaces/ecpg/compatlib/meson.build
+++ b/src/interfaces/ecpg/compatlib/meson.build
@@ -16,7 +16,8 @@ if host_system == 'windows'
 endif
 
 # see src/interfaces/libpq/meson.build
-ecpg_compat_st = static_library('libecpg_compat_static',
+if host_system != 'aix'
+ecpg_compat_st = static_library('libecpg_compat',
   ecpg_compat_sources,
   include_directories: ecpg_compat_inc,
   c_args: ecpg_compat_c_args,
@@ -25,6 +26,7 @@ ecpg_compat_st = static_library('libecpg_compat_static',
   kwargs: default_lib_args,
 )
 ecpg_targets += ecpg_compat_st
+endif
 
 ecpg_compat_so = shared_library('libecpg_compat',
   ecpg_compat_sources + ecpg_compat_so_sources,
diff --git a/src/interfaces/ecpg/ecpglib/meson.build b/src/interfaces/ecpg/ecpglib/meson.build
index e9faf290a2b..7d28cd67388 100644
--- a/src/interfaces/ecpg/ecpglib/meson.build
+++ b/src/interfaces/ecpg/ecpglib/meson.build
@@ -25,7 +25,8 @@ if host_system == 'windows'
 endif
 
 # see src/interfaces/libpq/meson.build
-ecpglib_st = static_library('libecpg_static',
+if host_system != 'aix'
+ecpglib_st = static_library('libecpg',
   ecpglib_sources,
   include_directories: ecpglib_inc,
   c_args: ecpglib_c_args,
@@ -35,6 +36,7 @@ ecpglib_st = static_library('libecpg_static',
   kwargs: default_lib_args,
 )
 ecpg_targets += ecpglib_st
+endif
 
 ecpglib_so = shared_library('libecpg',
   ecpglib_sources + ecpglib_so_sources,
diff --git a/src/interfaces/ecpg/pgtypeslib/meson.build b/src/interfaces/ecpg/pgtypeslib/meson.build
index 94d1d0ad1ef..97f4e1c6eda 100644
--- a/src/interfaces/ecpg/pgtypeslib/meson.build
+++ b/src/interfaces/ecpg/pgtypeslib/meson.build
@@ -21,7 +21,8 @@ if host_system == 'windows'
 endif
 
 # see src/interfaces/libpq/meson.build
-ecpg_pgtypes_st = static_library('libpgtypes_static',
+if host_system != 'aix'
+ecpg_pgtypes_st = static_library('libpgtypes',
   ecpg_pgtypes_sources,
   include_directories: ecpg_pgtypes_inc,
   c_args: ecpg_pgtypes_c_args,
@@ -30,6 +31,7 @@ ecpg_pgtypes_st = static_library('libpgtypes_static',
   kwargs: default_lib_args,
 )
 ecpg_targets += ecpg_pgtypes_st
+endif
 
 ecpg_pgtypes_so = shared_library('libpgtypes',
   ecpg_pgtypes_sources + ecpg_pgtypes_so_sources,
diff --git a/src/interfaces/libpq/meson.build b/src/interfaces/libpq/meson.build
index eea175ad14a..98ced9376d9 100644
--- a/src/interfaces/libpq/meson.build
+++ b/src/interfaces/libpq/meson.build
@@ -57,7 +57,8 @@ libpq_so_c_args = ['-DUSE_DYNAMIC_OAUTH']
 # We could try to avoid building the source files twice, but it probably adds
 # more complexity than its worth (reusing object files requires also linking
 # to the library on windows or breaks precompiled headers).
-libpq_st = static_library('libpq_static',
+if host_system != 'aix'
+libpq_st = static_library('libpq',
   libpq_sources,
   include_directories: [libpq_inc],
   c_args: libpq_c_args,
@@ -65,6 +66,7 @@ libpq_st = static_library('libpq_static',
   dependencies: [frontend_stlib_code, libpq_deps],
   kwargs: default_lib_args,
 )
+endif
 
 libpq_so = shared_library('libpq',
   libpq_sources + libpq_so_sources,
diff --git a/src/tools/gen_export.pl b/src/tools/gen_export.pl
index 25827c42a68..19c8b60560f 100644
--- a/src/tools/gen_export.pl
+++ b/src/tools/gen_export.pl
@@ -21,7 +21,7 @@ if (not(   $format eq 'darwin'
 		or $format eq 'win'
         or $format eq 'aix'))
 {
-	die "$0: $format is not yet handled (only darwin, gnu, win are)\n";
+	die "$0: $format is not yet handled (only darwin, gnu, win, aix are)\n";
 }
 
 open(my $input_handle, '<', $input)