[gdal-dev] GDAL 3.6.0 patch for building on iOS (and Mac Catalyst)

[Even Rouault]

Nik,

actually I've just modified it to the following that still tries to 
detect pread(). Can you test and report?

diff --git a/cmake/helpers/configure.cmake b/cmake/helpers/configure.cmake
index f52ea47db3..0939ffadda 100644
--- a/cmake/helpers/configure.cmake
+++ b/cmake/helpers/configure.cmake
@@ -241,16 +241,6 @@ else ()
    check_type_size("off_t" SIZEOF_OFF_T)

    check_function_exists(pread64 HAVE_PREAD64)
-  if( NOT HAVE_PREAD64 )
-    check_c_source_compiles(
-      "
-         #include <sys/types.h>
-         #include <sys/uio.h>
-         #include <unistd.h>
-         int main() { pread(0, NULL, 0, 0); return 0; }
-        "
-      HAVE_PREAD_BSD)
-  endif()

    check_function_exists(ftruncate64 HAVE_FTRUNCATE64)
    if (HAVE_FTRUNCATE64)
@@ -280,6 +270,19 @@ else ()
      unset(HAVE_FSEEK64 CACHE)
      unset(HAVE_STATVFS64)
      unset(HAVE_STATVFS64 CACHE)
+    unset(HAVE_PREAD64)
+    unset(HAVE_PREAD64 CACHE)
+  endif()
+
+  if( NOT HAVE_PREAD64 )
+    check_c_source_compiles(
+      "
+         #include <sys/types.h>
+         #include <sys/uio.h>
+         #include <unistd.h>
+         int main() { pread(0, NULL, 0, 0); return 0; }
+        "
+      HAVE_PREAD_BSD)
    endif()

    set(UNIX_STDIO_64 TRUE)

Le 12/11/2022 à 02:07, Even Rouault a écrit :
>
> Le 12/11/2022 à 02:00, Nik Sands a écrit :
>> Hi GDAL devs
>>
>> It appears as though ‘pread64’, introduced in 3.6.0, has broken 
>> building on iOS in the same way that other ‘…64’ errors used to occur 
>> on version 3.5.0 before being patched for 3.5.2.
>>
>> The attached patch (text content also pasted below) allows the build 
>> to continue past that point for iOS (and Mac Catalyst). I’m just an 
>> ignorant hobbyist who doesn’t really understand a lot of this stuff, 
>> so please check that what I’ve done here is correct!  :-)  If it’s 
>> all OK, then please apply this (or similar) patch for the next release.
>
> Patch queued in https://github.com/OSGeo/gdal/pull/6673
>
> Thanks
>
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