diff options
Diffstat (limited to 'release_docs/RELEASE.txt')
| -rw-r--r-- | release_docs/RELEASE.txt | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt index 279e9cc..4383c39 100644 --- a/release_docs/RELEASE.txt +++ b/release_docs/RELEASE.txt @@ -47,6 +47,40 @@ New Features Configuration: ------------- + - Overhauled LFS support checks + + In 2024, we can assume that Large File Support (LFS) exists on all + systems we support, though it may require flags to enable it, + particularly when building 32-bit binaries. The HDF5 source does + not use any of the 64-bit specific API calls (e.g., ftello64) + or explicit 64-bit offsets via off64_t. + + Autotools + + * We now use AC_SYS_LARGEFILE to determine how to support LFS. We + previously used a custom m4 script for this. + + CMake + + * The HDF_ENABLE_LARGE_FILE option (advanced) has been removed + * We no longer run a test program to determine if LFS works, which + will help with cross-compiling + * On Linux we now unilaterally set -D_LARGEFILE_SOURCE and + -D_FILE_OFFSET_BITS=64, regardless of 32/64 bit system. CMake + doesn't offer a nice equivalent to AC_SYS_LARGEFILE and since + those options do nothing on 64-bit systems, this seems safe and + covers all our bases. We don't set -D_LARGEFILE64_SOURCE since + we don't use any of the POSIX 64-bit specific API calls like + ftello64, as noted above. + * We didn't test for LFS support on non-Linux platforms. We've added + comments for how LFS should probably be supported on AIX and Solaris, + which seem to be alive, though uncommon. PRs would be appreciated if + anyone wishes to test this. + + This overhaul also fixes GitHub #2395, which points out that the LFS flags + used when building with CMake differ based on whether CMake has been + run before. The LFS check program that caused this problem no longer exists. + - The CMake HDF5_ENABLE_DEBUG_H5B option has been removed This enabled some additional version-1 B-tree checks. These have been |