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configure.ac
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## Process this file with autoconf to produce configure.
##
## Copyright by The HDF Group.
## All rights reserved.
##
## This file is part of HDF5. The full HDF5 copyright notice, including
## terms governing use, modification, and redistribution, is contained in
## the COPYING file, which can be found at the root of the source code
## distribution tree, or in https://www.hdfgroup.org/licenses.
## If you do not have access to either file, you may request a copy from
## help@hdfgroup.org.
## ----------------------------------------------------------------------
## Initialize configure.
##
AC_PREREQ([2.71])
## AC_INIT takes the name of the package, the version number, and an
## email address to report bugs. AC_CONFIG_SRCDIR takes a unique file
## as its argument.
##
## NOTE: Do not forget to change the version number here when we do a
## release!!!
##
AC_INIT([HDF5], [1.17.0], [help@hdfgroup.org])
AC_CONFIG_SRCDIR([src/H5.c])
AC_CONFIG_HEADERS([src/H5config.h])
AC_CONFIG_AUX_DIR([bin])
AC_CONFIG_MACRO_DIR([m4])
## AM_INIT_AUTOMAKE takes a list of options that should be applied to
## every Makefile.am when automake is run.
AM_INIT_AUTOMAKE([foreign subdir-objects])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])]) # use silent rules where available - automake 1.11
## AM_MAINTAINER_MODE determines the behavior of "rebuild rules" that contain
## dependencies for Makefile.in files, configure, src/H5config.h, etc. If
## AM_MAINTAINER_MODE is enabled, these files will be rebuilt if out of date.
## When disabled, the autotools build files can get out of sync and the build
## system will not complain or try to regenerate downstream files.
##
## The AM_MAINTAINER_MODE macro also determines whether the
## --(enable|disable)-maintainer-mode configure option is available. When the
## macro is present, with or without a parameter, the option will be added
## to the generated configure script.
##
## In summary:
##
## AM_MAINTAINER_MODE([enable])
## - Build dependencies ON by default
## - Configure option exists
##
## AM_MAINTAINER_MODE([disable])
## - Build dependencies OFF by default
## - Configure option exists
##
## AM_MAINTAINER_MODE
## - Build dependencies OFF by default
## - Configure option exists
##
## No AM_MAINTAINER_MODE macro
## - Build dependencies ON by default
## - No configure option to control build dependencies
##
## The biggest concern for us is that version control systems like git
## usually don't preserve dependencies between timestamps, so the build
## system will often think that upstream build files like Makefile.am are
## dirty and that rebuilding needs to occur when it doesn't. This is a problem
## in release branches where we provide the autotools-generated files. Users
## who don't have autoconf, automake, etc. will then have difficulty building
## release branches checked out from git.
##
## By default, maintainer mode is enabled in development branches and disabled
## in release branches.
AM_MAINTAINER_MODE([enable])
## ----------------------------------------------------------------------
## Set prefix default (install directory) to a directory in the build area.
## This allows multiple src-dir builds within one host.
AC_PREFIX_DEFAULT([`pwd`/hdf5])
## Run post processing on files created by configure
##
## src/H5pubconf.h:
## Generate src/H5pubconf.h from src/H5config.h by prepending H5_ to all
## macro names. This avoid name conflict between HDF5 macro names and those
## generated by another software package that uses the HDF5 library.
##
## src/libhdf5.settings:
## Remove all lines beginning with "#" which are generated by CONDITIONAL's
## of configure.
##
## src/H5build_settings.c
## Remove all lines beginning with "#" which are generated by CONDITIONAL's
## of configure. This uses a check for whitespace after the pound sign
## to avoid clobbering include statements.
AC_CONFIG_COMMANDS([pubconf], [
echo "creating src/H5pubconf.h"
sed 's/#define /#define H5_/' <src/H5config.h |\
sed 's/#undef /#undef H5_/' >pubconf
if test ! -f src/H5pubconf.h; then
mv -f pubconf src/H5pubconf.h
elif (diff pubconf src/H5pubconf.h >/dev/null); then
rm -f pubconf
echo "src/H5pubconf.h is unchanged"
else
mv -f pubconf src/H5pubconf.h
fi
echo "Post process src/libhdf5.settings"
sed '/^#/d' < src/libhdf5.settings > libhdf5.settings.TMP
cp libhdf5.settings.TMP src/libhdf5.settings
rm -f libhdf5.settings.TMP
echo "Post process src/H5build_settings.c"
sed '/^# /d' < src/H5build_settings.c > H5build_settings.TMP
cp H5build_settings.TMP src/H5build_settings.c
rm -f H5build_settings.TMP
])
## It's possible to configure for a host other than the one on which
## configure is currently running by using the --host=foo flag.
## For machines on which HDF5 is often configured, it can be convenient
## to specify the name of the machine rather than its canonical type.
##
## There are currently no hosts, but if there were they would be
## listed by hostname and the alias would point to a file in
## the config directory:
##
##case $host_alias in
## <some host>)
## host_alias=<config file in config directory>
## ;;
##esac
AC_CANONICAL_HOST
AC_SUBST([CPPFLAGS])
AC_SUBST([JNIFLAGS])
AC_SUBST([AR_FLAGS])
## H5_CFLAGS (and company) are for CFLAGS that should be used on HDF5, but
## not exported to h5cc (or h5fc, etc.)
##
AC_SUBST([H5_CFLAGS])
AC_SUBST([H5_CPPFLAGS])
AC_SUBST([H5_FCFLAGS])
AC_SUBST([H5_CXXFLAGS])
AC_SUBST([H5_JNIFLAGS])
AC_SUBST([H5_JAVACFLAGS])
AC_SUBST([H5_JAVAFLAGS])
AC_SUBST([H5_LDFLAGS])
## AM_CFLAGS (and company) are for CFLAGS that should be used on HDF5,
## and WILL be exported to h5cc (or h5fc, etc) if set by configure.
AC_SUBST([AM_CFLAGS])
AC_SUBST([AM_FCFLAGS])
AC_SUBST([AM_CXXFLAGS])
AC_SUBST([AM_CPPFLAGS])
AC_SUBST([AM_JNIFLAGS])
AC_SUBST([AM_JAVACFLAGS])
AC_SUBST([AM_JAVAFLAGS])
AC_SUBST([AM_LDFLAGS])
## Make sure flags are initialized.
AM_CFLAGS="${AM_CFLAGS}"
AM_CXXFLAGS="${AM_CXXFLAGS}"
AM_FCFLAGS="${AM_FCFLAGS}"
AM_CPPFLAGS="${AM_CPPFLAGS}"
AM_JNIFLAGS="${AM_JNIFLAGS}"
AM_JAVACFLAGS="${AM_JAVACFLAGS}"
AM_JAVAFLAGS="${AM_JAVAFLAGS}"
AM_LDFLAGS="${AM_LDFLAGS}"
## Flags passed in by the user
CFLAGS="${CFLAGS}"
CXXFLAGS="${CXXFLAGS}"
FCFLAGS="${FCFLAGS}"
CPPFLAGS="${CPPFLAGS}"
JNIFLAGS="${JNIFLAGS}"
JAVACFLAGS="${JAVACFLAGS}"
JAVAFLAGS="${JAVAFLAGS}"
LDFLAGS="${LDFLAGS}"
AR_FLAGS="${AR_FLAGS}"
## Configure may need to alter any of the *FLAGS variables in order for
## various checks to work correctly. Save the user's value here so it
## can be restored once all configure checks are complete.
saved_user_CFLAGS="$CFLAGS"
saved_user_CXXFLAGS="$CXXFLAGS"
saved_user_FCFLAGS="$FCFLAGS"
saved_user_JAVACFLAGS="$JAVACFLAGS"
saved_user_JAVAFLAGS="$JAVAFLAGS"
saved_user_LDFLAGS="$LDFLAGS"
saved_user_CPPFLAGS="$CPPFLAGS"
## Strip out -Werror from CFLAGS since that can cause checks to fail when
## compiling test programs fails due to warnings
##
## Regex:
##
## -Werror Literal -Werror
## \( Start optional capturing group
## = Literal equals sign
## [^[:space:]] Non-space characters
## \+ 1 or more of the above
## \) End optional capturing group
## \? 0 or 1 capturing group matches
##
## Note that the outer pair of '[]' ends up getting removed
WERROR_SED='s/-Werror\(=[[^[:space:]]]\+\)\?//g'
CFLAGS_SED="`echo $CFLAGS | sed -e $WERROR_SED`"
if test $? -eq 0; then
CFLAGS="$CFLAGS_SED"
fi
CXXFLAGS_SED="`echo $CXXFLAGS | sed -e $WERROR_SED`"
if test $? -eq 0; then
CXXFLAGS="$CXXFLAGS_SED"
fi
FCFLAGS_SED="`echo $FCFLAGS | sed -e $WERROR_SED`"
if test $? -eq 0; then
FCFLAGS="$FCFLAGS_SED"
fi
JAVACFLAGS_SED="`echo $JAVACFLAGS | sed -e $WERROR_SED`"
if test $? -eq 0; then
JAVACFLAGS="$JAVACFLAGS_SED"
fi
CPPFLAGS_SED="`echo $CPPFLAGS | sed -e $WERROR_SED`"
if test $? -eq 0; then
CPPFLAGS="$CPPFLAGS_SED"
fi
## Support F9X variable to define Fortran compiler if FC variable is
## not used. This should be deprecated in the future.
if test "x" = "x$FC"; then
FC=${F9X}
fi
## ----------------------------------------------------------------------
## Dump all shell variables values.
##
AC_MSG_CHECKING([shell variables initial values])
set >&AS_MESSAGE_LOG_FD
AC_MSG_RESULT([done])
## ----------------------------------------------------------------------
## Save system information for the library settings file.
##
AC_SUBST([UNAME_INFO])
UNAME_INFO=`uname -a`
## ----------------------------------------------------------------------
## Some platforms have broken basename, and/or xargs programs. Check
## that it actually does what it's supposed to do. Catch this early
## since configure and scripts relies upon them heavily and there's
## no use continuing if it's broken.
##
AC_MSG_CHECKING([if basename works])
BASENAME_TEST="`basename /foo/bar/baz/qux/basename_works`"
if test $BASENAME_TEST != "basename_works"; then
AC_MSG_ERROR([basename program doesn't work])
else
AC_MSG_RESULT([yes])
fi
## xargs basename used in configure to get the CC_BASENAME value
AC_MSG_CHECKING([if xargs works])
XARGS_TEST="`echo /foo/bar/baz/qux/xargs_works | xargs basename`"
if test $XARGS_TEST != "xargs_works"; then
AC_MSG_ERROR([xargs program doesn't work])
else
AC_MSG_RESULT([yes])
fi
## ----------------------------------------------------------------------
## Check that the cache file was build on the same host as what we're
## running on now.
##
AC_CACHE_CHECK([for cached host], [hdf5_cv_host], [hdf5_cv_host="none"]);
if test $hdf5_cv_host = "none"; then
hdf5_cv_host=$host
elif test $hdf5_cv_host != $host; then
AC_MSG_ERROR([
The config.cache file was generated on $hdf5_cv_host but
this is $host. Please remove that file and try again.
config.cache file is invalid])
fi
## ----------------------------------------------------------------------
## Check if we should consider certain compiler warnings as errors
##
## We have to set WARNINGS_AS_ERRORS before sourcing a $host_config
## file, below.
##
## These should NOT be on by default as the risk of breakage is high
## when compiling HDF5 on new (or new versions) of platforms and
## compilers. It can also cause failures when header files we have no
## control over (e.g. MPI, HDFS) raise warnings.
##
AC_MSG_CHECKING([enable warnings as errors])
AC_ARG_ENABLE([warnings-as-errors],
[AS_HELP_STRING([--enable-warnings-as-errors],
[Determines whether certain warnings will be
considered errors. This is mainly for use
by HDF5 library developers.
[default=no]
])],
[WARNINGS_AS_ERRORS=$enableval])
## Set default
if test "X-$WARNINGS_AS_ERRORS" = X- ; then
WARNINGS_AS_ERRORS=no
fi
case "X-$WARNINGS_AS_ERRORS" in
X-yes|X-no)
AC_MSG_RESULT([$WARNINGS_AS_ERRORS])
;;
*)
AC_MSG_ERROR([Unrecognized value: $WARNINGS_AS_ERRORS])
;;
esac
## ----------------------------------------------------------------------
## Source any special files that we need. These files normally aren't
## present but can be used by the maintainers to fine tune things like
## turning on debug or profiling flags for the compiler. The search order
## is:
##
## CPU-VENDOR-OS
## VENDOR-OS
## CPU-OS
## CPU-VENDOR
## OS
## VENDOR
## CPU
##
## If the `OS' ends with a version number then remove it. For instance,
## `freebsd3.1' would become `freebsd'
case $host_os in
aix*)
host_os_novers=aix
;;
freebsd*)
host_os_novers=freebsd
;;
netbsd*)
host_os_novers=netbsd
;;
solaris*)
host_os_novers=solaris
;;
*)
host_os_novers=$host_os
;;
esac
host_config="none"
for f in $host_cpu-$host_vendor-$host_os \
$host_cpu-$host_vendor-$host_os_novers \
$host_vendor-$host_os \
$host_vendor-$host_os_novers \
$host_cpu-$host_os \
$host_cpu-$host_os_novers \
$host_cpu-$host_vendor \
$host_os \
$host_os_novers \
$host_vendor \
$host_cpu ; do
AC_MSG_CHECKING([for config $f])
if test -f "$srcdir/config/$f"; then
host_config=$srcdir/config/$f
AC_MSG_RESULT([found])
break
fi
AC_MSG_RESULT([no])
done
if test "X$host_config" != "Xnone"; then
CC_BASENAME="`echo $CC | cut -f1 -d' ' | xargs basename 2>/dev/null`"
. $host_config
fi
## Source any special site-specific file
hname="`hostname`"
while test -n "$hname"; do
file=$srcdir/config/site-specific/host-$hname
AC_MSG_CHECKING([for config $file])
if test -f "$file"; then
. $file
AC_MSG_RESULT([found])
break
fi
AC_MSG_RESULT([no])
hname_tmp=$hname
hname="`echo $hname | cut -d. -f2-99`"
test "$hname_tmp" = "$hname" && break
done
##
## Enable/disable sanitizer checks for clang compilers, initially address sanitizer
##
AC_MSG_CHECKING([for clang sanitizer checks])
AC_ARG_ENABLE([sanitize-checks],
[AS_HELP_STRING([--enable-sanitize-checks=address],
[(clang/clang++ compilers only) Enable sanitize checks.
Address is useful for detecting issues dealing with
memory. See AddressSanitizer in config/sanitizer/README.md
for more information.
[default=none]
])],
[CLANG_SANITIZE_CHECKS=$enableval])
# Set default
if test "X-$CLANG_SANITIZE_CHECKS" = X- ; then
CLANG_SANITIZE_CHECKS=none
fi
if test "X$CC_BASENAME" = "Xclang"; then
AC_SUBST([CLANG_SANITIZE_CHECKS])
# There are several sanitizer tools. At present we are testing
# and describing only -fsanitizer=address with autotools.
case "X-$CLANG_SANITIZE_CHECKS" in
X-no|X-none)
CLANG_SANITIZE_CHECKS=none
CLANG_SANITIZE_LIST=
;;
*)
CLANG_SANITIZE_LIST=$CLANG_SANITIZE_CHECKS
;;
esac
AC_MSG_RESULT([$CLANG_SANITIZE_CHECKS])
# Other tools can be added to the list of checks
# The clang compiler doesn't support some of them; they should be
# checked before adding them to the list in the help message.
# The sanitizers/sanitizers.cmake file lists these options:
# address, memory, memoryWithOrigins, undefined, thread, leak,
# 'address;undefined'. Which and which combinations of these are
# supported varies by compiler version, but unsupported options
# or combinations will result in configure errors reported in config.log.
# Comma separated lists of sanitize options will be entered intact in
# one -fsanitize=<list> flag. Space separated lists will be entered in
# separate -fsanitize=<item> flags.
# NOTE: No sanity checking done here!
if test -n "$CLANG_SANITIZE_LIST"; then
H5_CFLAGS="$H5_CFLAGS -fno-omit-frame-pointer"
H5_CXXFLAGS="$H5_CXXFLAGS -fno-omit-frame-pointer"
for sanitizer in `echo $CLANG_SANITIZE_LIST`; do
H5_CFLAGS="$H5_CFLAGS -fsanitize=${sanitizer}"
H5_CXXFLAGS="$H5_CXXFLAGS -fsanitize=${sanitizer}"
done
fi
fi
## ----------------------------------------------------------------------
## Determine build mode (debug, production, clean).
## This has to be done early since the build mode is referred to
## frequently.
##
AC_MSG_CHECKING([build mode])
AC_ARG_ENABLE([build-mode],
[AS_HELP_STRING([--enable-build-mode=(debug|production|clean)],
[Sets the build mode. Debug turns on symbols, API
tracing, asserts, and debug optimization,
as well as several other minor configure options
that aid in debugging.
Production turns high optimizations on.
Clean turns nothing on and disables optimization
(i.e.: a 'clean slate' configuration).
All these settings can be overridden by using
specific configure flags.
[default=debug]
])],
[BUILD_MODE=$enableval])
## Set the default
## Depends on branch, set via script at branch creation time
if test "X-$BUILD_MODE" = X- ; then
BUILD_MODE=debug
fi
## Allow this variable to be substituted in
## other files (src/libhdf5.settings.in, etc.)
AC_SUBST([BUILD_MODE])
case "X-$BUILD_MODE" in
X-clean)
AC_MSG_RESULT([clean])
;;
X-debug)
AC_DEFINE([DEBUG_BUILD], [1], [Define if this is a debug build.])
H5_CFLAGS="$H5_CFLAGS $DEBUG_CFLAGS"
H5_CPPFLAGS="$H5_CPPFLAGS $DEBUG_CPPFLAGS"
H5_CXXFLAGS="$H5_CXXFLAGS $DEBUG_CXXFLAGS"
H5_FCFLAGS="$H5_FCFLAGS $DEBUG_FCFLAGS"
AC_MSG_RESULT([debug])
;;
X-production)
H5_CFLAGS="$H5_CFLAGS $PROD_CFLAGS"
H5_CPPFLAGS="$H5_CPPFLAGS $PROD_CPPFLAGS"
H5_CXXFLAGS="$H5_CXXFLAGS $PROD_CXXFLAGS"
H5_FCFLAGS="$H5_FCFLAGS $PROD_FCFLAGS"
AC_MSG_RESULT([production])
;;
*)
AC_MSG_ERROR([Unrecognized build mode: $BUILD_MODE. Use debug, production, or clean.])
esac
## ----------------------------------------------------------------------
## Some built-in configure checks can only see CFLAGS (not AM_CFLAGS), so
## we need to add this in so configure works as intended. We will need to
## reset this value at the end of configure, to preserve the user's settings.
CFLAGS="${AM_CFLAGS} ${CFLAGS}"
FCFLAGS="${AM_FCFLAGS} ${FCFLAGS}"
JAVACFLAGS="${AM_JAVACFLAGS} ${JAVACFLAGS}"
JAVAFLAGS="${AM_JAVAFLAGS} ${JAVAFLAGS}"
CXXFLAGS="${AM_CXXFLAGS} ${CXXFLAGS}"
CPPFLAGS="${AM_CPPFLAGS} ${CPPFLAGS}"
LDFLAGS="${AM_LDFLAGS} ${LDFLAGS}"
## ----------------------------------------------------------------------
## Enable dependency tracking unless the configure options or a
## site-specific file told us not to. This prevents configure from
## silently disabling dependencies for some compilers.
##
if test -z "${enable_dependency_tracking}"; then
enable_dependency_tracking="yes"
fi
## ----------------------------------------------------------------------
## Check for programs.
##
AC_PROG_CC
CC_BASENAME="`echo $CC | cut -f1 -d' ' | xargs basename 2>/dev/null`"
## ----------------------------------------------------------------------------
## Configure disallows unsupported combinations of options. However, users
## may want to override and build with unsupported combinations for their
## own use. They can use the --enable-unsupported configure flag, which
## ignores any errors from configure due to incompatible flags.
AC_MSG_CHECKING([if unsupported combinations of configure options are allowed])
AC_ARG_ENABLE([unsupported],
[AS_HELP_STRING([--enable-unsupported],
[Allow unsupported combinations of configure options])],
[ALLOW_UNSUPPORTED=$enableval])
case "X-$ALLOW_UNSUPPORTED" in
X-|X-no)
AC_MSG_RESULT([no])
;;
X-yes)
AC_MSG_RESULT([yes])
;;
*)
;;
esac
## ----------------------------------------------------------------------
## Data types and their sizes.
##
AC_TYPE_OFF_T
AC_CHECK_TYPE([ssize_t], [],
[AC_DEFINE_UNQUOTED([ssize_t], [long],
[Define to `long' if <sys/types.h> does not define.])])
AC_C_BIGENDIAN
AC_CHECK_SIZEOF([char])
AC_CHECK_SIZEOF([short])
AC_CHECK_SIZEOF([int])
AC_CHECK_SIZEOF([unsigned])
AC_CHECK_SIZEOF([long])
AC_CHECK_SIZEOF([long long])
AC_CHECK_SIZEOF([float])
AC_CHECK_SIZEOF([double])
AC_CHECK_SIZEOF([long double])
#-----------------------------------------------------------------------------
# Option for enabling/disabling support for non-standard features, datatypes,
# etc. These features should still be checked for at configure time, but these
# options allow disabling of support for these features when compiler support
# is incomplete or broken. In this case, configure time checks may not be
# enough to properly enable/disable a feature and can cause library build
# problems.
#-----------------------------------------------------------------------------
AC_MSG_CHECKING([if non-standard feature support is enabled])
AC_ARG_ENABLE([nonstandard-features],
[AS_HELP_STRING([--enable-nonstandard-features],
[Enable support for non-standard programming language features [default=yes]])],
[NONSTANDARD_FEATURES=$enableval])
## Set default
if test "X-$NONSTANDARD_FEATURES" = X- ; then
NONSTANDARD_FEATURES=yes
fi
case "X-$NONSTANDARD_FEATURES" in
X-yes|X-no)
AC_MSG_RESULT([$NONSTANDARD_FEATURES])
;;
*)
AC_MSG_ERROR([Unrecognized value: $NONSTANDARD_FEATURES])
;;
esac
## ----------------------------------------------------------------------
## Check if _Float16 support is available
##
AC_MSG_CHECKING([if _Float16 support is enabled])
AC_ARG_ENABLE([nonstandard-feature-float16],
[AS_HELP_STRING([--enable-nonstandard-feature-float16],
[Enable support for _Float16 C datatype [default=yes]])],
[ENABLE_FLOAT16=$enableval])
## Set default
if test "X-$ENABLE_FLOAT16" = X- ; then
ENABLE_FLOAT16=$NONSTANDARD_FEATURES
fi
case "X-$ENABLE_FLOAT16" in
X-yes|X-no)
AC_MSG_RESULT([$ENABLE_FLOAT16])
;;
*)
AC_MSG_ERROR([Unrecognized value: $ENABLE_FLOAT16])
;;
esac
HAVE__FLOAT16="no"
if test "X$ENABLE_FLOAT16" = "Xyes"; then
AC_MSG_NOTICE([checking if _Float16 support is available])
AC_CHECK_SIZEOF([_Float16])
if test "$ac_cv_sizeof__Float16" != 0; then
# Some compilers expose the _Float16 datatype, but not the macros and
# functions used with the datatype. We need the macros for proper
# datatype conversion support. Check for these here.
AC_CHECK_DECL([FLT16_EPSILON], [], [], [[
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <float.h>]])
AC_CHECK_DECL([FLT16_MIN], [], [], [[
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <float.h>]])
AC_CHECK_DECL([FLT16_MAX], [], [], [[
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <float.h>]])
AC_CHECK_DECL([FLT16_MIN_10_EXP], [], [], [[
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <float.h>]])
AC_CHECK_DECL([FLT16_MAX_10_EXP], [], [], [[
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <float.h>]])
AC_CHECK_DECL([FLT16_MANT_DIG], [], [], [[
#define __STDC_WANT_IEC_60559_TYPES_EXT__
#include <float.h>]])
if test "X$ac_cv_have_decl_FLT16_EPSILON" = "Xyes" &&
test "X$ac_cv_have_decl_FLT16_MIN" = "Xyes" &&
test "X$ac_cv_have_decl_FLT16_MAX" = "Xyes" &&
test "X$ac_cv_have_decl_FLT16_MIN_10_EXP" = "Xyes" &&
test "X$ac_cv_have_decl_FLT16_MAX_10_EXP" = "Xyes" &&
test "X$ac_cv_have_decl_FLT16_MANT_DIG" = "Xyes" ; then
# Some compilers like OneAPI on Windows appear to detect _Float16 support
# properly up to this point, and, in the absence of any architecture-specific
# tuning compiler flags, will generate code for H5Tconv.c that performs
# software conversions on _Float16 variables with compiler-internal functions
# such as __extendhfsf2, __truncsfhf2, or __truncdfhf2. However, these
# compilers will fail to link these functions into the build for currently
# unknown reasons and cause the build to fail. Since these are compiler-internal
# functions that we don't appear to have much control over, let's try to
# compile a program that will generate these functions to check for _Float16
# support. If we fail to compile this program, we will simply disable
# _Float16 support for the time being.
AC_MSG_CHECKING([if compiler can correctly compile and run a test program which converts _Float16 to other types with casts])
TEST_SRC="`(echo \"#define H5_FLOAT16_CONVERSION_FUNCS_LINK_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"
AC_CACHE_VAL([hdf5_cv_float16_conversion_funcs_link],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([$TEST_SRC])],
[hdf5_cv_float16_conversion_funcs_link=yes],
[hdf5_cv_float16_conversion_funcs_link=no],
[hdf5_cv_float16_conversion_funcs_link=no])])
AC_MSG_RESULT(${hdf5_cv_float16_conversion_funcs_link})
# Some compilers, notably AppleClang on MacOS 12, will succeed in the
# configure check above when optimization flags like -O3 are manually
# passed in CFLAGS. However, the build will then fail when it reaches
# compilation of H5Tconv.c because of the issue mentioned above. MacOS
# 13 appears to have fixed this, but, just to be sure, make sure the
# check also passes without the passed in CFLAGS.
conftest_cflags_backup="$CFLAGS"
CFLAGS=""
AC_MSG_CHECKING([if compiler can correctly compile and run a test program which converts _Float16 to other types with casts (without CFLAGS)])
TEST_SRC="`(echo \"#define H5_FLOAT16_CONVERSION_FUNCS_LINK_NO_FLAGS_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"
AC_CACHE_VAL([hdf5_cv_float16_conversion_funcs_link_no_flags],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([$TEST_SRC])],
[hdf5_cv_float16_conversion_funcs_link_no_flags=yes],
[hdf5_cv_float16_conversion_funcs_link_no_flags=no],
[hdf5_cv_float16_conversion_funcs_link_no_flags=no])])
AC_MSG_RESULT(${hdf5_cv_float16_conversion_funcs_link_no_flags})
CFLAGS="$conftest_cflags_backup"
if test ${hdf5_cv_float16_conversion_funcs_link} = "yes" &&
test ${hdf5_cv_float16_conversion_funcs_link_no_flags} = "yes"; then
# Finally, MacOS 13 appears to have a bug specifically when converting
# long double values to _Float16. Release builds of the dt_arith test
# would cause any assignments to a _Float16 variable to be elided,
# whereas Debug builds would perform incorrect hardware conversions by
# simply chopping off all the bytes of the value except for the first 2.
# These tests pass on MacOS 14, so let's perform a quick test to check
# if the hardware conversion is done correctly.
AC_MSG_CHECKING([if compiler can correctly convert long double values to _Float16])
TEST_SRC="`(echo \"#define H5_LDOUBLE_TO_FLOAT16_CORRECT_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"
if test ${ac_cv_sizeof_long_double} = 0; then
hdf5_cv_ldouble_to_float16_correct=${hdf5_cv_ldouble_to_float16_correct=no}
else
AC_CACHE_VAL([hdf5_cv_ldouble_to_float16_correct],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([$TEST_SRC])],
[hdf5_cv_ldouble_to_float16_correct=yes],
[hdf5_cv_ldouble_to_float16_correct=no],
[hdf5_cv_ldouble_to_float16_correct=yes])])
fi
AC_MSG_RESULT(${hdf5_cv_ldouble_to_float16_correct})
# Backup and clear CFLAGS before performing configure check again
conftest_cflags_backup="$CFLAGS"
CFLAGS=""
AC_MSG_CHECKING([if compiler can correctly convert long double values to _Float16 (without CFLAGS)])
TEST_SRC="`(echo \"#define H5_LDOUBLE_TO_FLOAT16_CORRECT_NO_FLAGS_TEST 1\"; cat $srcdir/config/cmake/ConversionTests.c)`"
if test ${ac_cv_sizeof_long_double} = 0; then
hdf5_cv_ldouble_to_float16_correct_no_flags=${hdf5_cv_ldouble_to_float16_correct_no_flags=no}
else
AC_CACHE_VAL([hdf5_cv_ldouble_to_float16_correct_no_flags],
[AC_RUN_IFELSE(
[AC_LANG_SOURCE([$TEST_SRC])],
[hdf5_cv_ldouble_to_float16_correct_no_flags=yes],
[hdf5_cv_ldouble_to_float16_correct_no_flags=no],
[hdf5_cv_ldouble_to_float16_correct_no_flags=yes])])
fi
AC_MSG_RESULT(${hdf5_cv_ldouble_to_float16_correct_no_flags})
CFLAGS="$conftest_cflags_backup"
if test ${hdf5_cv_ldouble_to_float16_correct} = "yes" &&
test ${hdf5_cv_ldouble_to_float16_correct_no_flags} = "yes"; then
AC_DEFINE([LDOUBLE_TO_FLOAT16_CORRECT], [1],
[Define if your system can convert long double to _Float16 values correctly.])
else
AC_MSG_NOTICE([Conversions from long double to _Float16 appear to be incorrect. These will be emulated through a soft conversion function.])
fi
HAVE__FLOAT16="yes"
# Check if we can use fabsf16
AC_CHECK_FUNC([fabsf16], [AC_DEFINE([HAVE_FABSF16], [1],
[Define if has fabsf16 function])], [])
# Define HAVE__FLOAT16 macro for H5pubconf.h if _Float16 is available.
AC_DEFINE([HAVE__FLOAT16], [1], [Determine if _Float16 is available])
fi
fi
AC_MSG_CHECKING([if _Float16 support is enabled])
AC_MSG_RESULT([$HAVE__FLOAT16])
fi
else
AC_DEFINE([SIZEOF__FLOAT16], [0])
fi
# Define HAVE__FLOAT16 value to substitute into other files for conditional testing
AC_SUBST([HAVE__FLOAT16])
## ----------------------------------------------------------------------
## Check if the Fortran interface should be enabled
##
## This needs to be exposed for the library info file even if Fortran is disabled.
AC_SUBST([HDF_FORTRAN])
## Default is no Fortran
HDF_FORTRAN=no
AC_SUBST([HDF5_INTERFACES]) HDF5_INTERFACES=""
AC_MSG_CHECKING([if Fortran interface enabled])
AC_ARG_ENABLE([fortran],
[AS_HELP_STRING([--enable-fortran],
[Compile the Fortran interface [default=no]])],
[HDF_FORTRAN=$enableval])
AC_MSG_RESULT([$HDF_FORTRAN])
if test "X$HDF_FORTRAN" = "Xyes"; then
## ----------------------------------------------------------------------
## __float128 checks
##
## If __float128 exists and we can determine its precision, we will use
## it in the Fortran interface. The checks for this require that the
## precision be specified via a symbol named FLT128_DIG, which might be
## found in quadmath.h.
##
## The checks here are based on the GNU __float128 extension type from
## libquadmath, which is now part of gcc. Other compilers (clang, Intel)
## also expose __float128 and/or __float128 may be an alias for some
## other 128-bit floating point type.
##
## 128-bit floating-point math is usually handled in software and is thus
## orders of magnitude slower than hardware-supported floating-point math.
##
AC_MSG_CHECKING([if __float128 exists])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[__float128 x; return 0;]])],
[HAVE___FLOAT128=1; AC_MSG_RESULT([yes])],
[HAVE___FLOAT128=0; AC_MSG_RESULT([no])]
)
## gcc puts symbols like FLT128_DIG in quadmath.h instead of float.h,
## so check for that before running the precision macro. Note that
## using AC_CHECK_HEADER instead of AC_CHECK_HEADERS keeps the
## H5_HAVE_QUADMATH_H symbol out of the public config header.
##
AC_CHECK_HEADER([quadmath.h], [INCLUDE_QUADMATH_H=1], [INCLUDE_QUADMATH_H=0])
## ----------------------------------------------------------------------
## Get the max decimal precision in C, checking both long double and
## __float128 (if available)
##
AC_MSG_CHECKING([maximum decimal precision for C])
MY_FLT128_DIG=0
MY_LDBL_DIG=0
## Macro to compare long double and __float128 to see which has higher precision
PAC_FC_LDBL_DIG
## Set results
if test "$MY_FLT128_DIG" -gt "$MY_LDBL_DIG" ; then
PAC_C_MAX_REAL_PRECISION=$MY_FLT128_DIG
PRECISION_TYPE="(__float128)"
else
PAC_C_MAX_REAL_PRECISION=$MY_LDBL_DIG
PRECISION_TYPE="(long double)"
fi
AC_MSG_RESULT([$PAC_C_MAX_REAL_PRECISION $PRECISION_TYPE])
## Store results in config file
AC_SUBST([PAC_C_MAX_REAL_PRECISION])
AC_DEFINE_UNQUOTED([PAC_C_MAX_REAL_PRECISION], $PAC_C_MAX_REAL_PRECISION, [Determine the maximum decimal precision in C])
## Are we going to use __float128?
AC_MSG_CHECKING([if __float128 will be used in the Fortran wrappers])
if test "$MY_FLT128_DIG" -gt "$MY_LDBL_DIG" ; then
AC_MSG_RESULT([yes])
AC_DEFINE([HAVE_FLOAT128], [1], [Determine if __float128 will be used in the Fortran wrappers])
AC_CHECK_SIZEOF([__float128])
else
## Can't use __float128, but write an undef line anyway
AC_MSG_RESULT([no])
AH_TEMPLATE([HAVE_FLOAT128], [Determine if __float128 will be used in the Fortran wrappers])
fi
## ----------------------------------------------------------------------
## Define interface version
##
VERS_MAJOR=`cat $srcdir/src/H5public.h | sed -n 's/^#define H5_VERS_MAJOR //p'`
VERS_MINOR=`cat $srcdir/src/H5public.h | sed -n 's/^#define H5_VERS_MINOR //p'`
VERS_RELEASE=`cat $srcdir/src/H5public.h | sed -n 's/^#define H5_VERS_RELEASE //p'`
AC_DEFINE_UNQUOTED([VERS_MAJOR_TMP], $VERS_MAJOR, [Define major library version])
AC_DEFINE_UNQUOTED([VERS_MINOR_TMP], $VERS_MINOR, [Define minor library version])
AC_DEFINE_UNQUOTED([VERS_RELEASE_TMP], $VERS_RELEASE, [Define release library version])
## We will output an include file for Fortran, H5config_f.inc which
## contains various configure definitions used by the Fortran Library.
## Prepend H5_ to all macro names. This avoids name conflict between HDF5 macro
## names and those generated by another software package that uses the HDF5 library.
AC_CONFIG_HEADERS([fortran/src/H5config_f.inc],
[cat fortran/src/H5config_f.inc | sed '1d;s%^/\* \(.*\) \*/%\1%;s/#define /#define H5_/;s/#undef /#undef H5_/' >fortran/src/H5config_f.inc.tmp; sed -i 's\_TMP\\g' fortran/src/H5config_f.inc.tmp; mv -f fortran/src/H5config_f.inc.tmp fortran/src/H5config_f.inc])
AC_SUBST([FC])
HDF5_INTERFACES="$HDF5_INTERFACES fortran"
## --------------------------------------------------------------------
## HDF5 integer variables for the H5fortran_types.f90 file.
##
AC_SUBST([R_LARGE])
AC_SUBST([R_INTEGER])
AC_SUBST([HADDR_T])
AC_SUBST([HSIZE_T])
AC_SUBST([HSSIZE_T])
AC_SUBST([HID_T])
AC_SUBST([SIZE_T])
AC_SUBST([OBJECT_NAMELEN_DEFAULT_F])
## --------------------------------------------------------------------
## Fortran source extension
##
AC_FC_SRCEXT([f90])
AC_SUBST([F9XSUFFIXFLAG])
AC_SUBST([FSEARCH_DIRS])
## --------------------------------------------------------------------
## Check for a Fortran compiler and how to include modules.
##
AC_PROG_FC([PAC_FC_SEARCH_LIST],)
AC_F9X_MODS
## Allow setting the fortran module install dir
AC_ARG_WITH([fmoddir],
[AS_HELP_STRING([--with-fmoddir=DIR], [Fortran module install directory])],
[fmoddir=$withval],
[fmoddir="\${includedir}"])
AC_SUBST([fmoddir], [$fmoddir])
## Change to the Fortran 90 language
AC_LANG_PUSH(Fortran)
## Checking if the compiler supports the required Fortran 2003 features and
## stopping if it does not.
PAC_PROG_FC_HAVE_F2003_REQUIREMENTS
if test "X$HAVE_F2003_REQUIREMENTS" = "Xno"; then
AC_MSG_ERROR([Fortran compiler lacks required Fortran 2003 features; unsupported Fortran 2003 compiler, remove --enable-fortran])
fi
## Checking if the compiler supports fortran character being allocatable
PAC_HAVE_CHAR_ALLOC
## --------------------------------------------------------------------
## Define wrappers for the C compiler to use Fortran function names
##
AC_FC_WRAPPERS
## --------------------------------------------------------------------
## See if the fortran compiler supports the intrinsic function "SIZEOF"
PAC_PROG_FC_SIZEOF
## See if the fortran compiler supports the intrinsic function "C_SIZEOF"
PAC_PROG_FC_C_SIZEOF
## See if the fortran compiler supports the intrinsic function "STORAGE_SIZE"
PAC_PROG_FC_STORAGE_SIZE
## --------------------------------------------------------------------
## Checking if the fortran compiler supports ISO_FORTRAN_ENV (Fortran 2008)
HAVE_ISO_FORTRAN_ENV="0"
PAC_PROG_FC_ISO_FORTRAN_ENV
if test "X$CHECK_ISO_FORTRAN_ENV" = "Xyes"; then
HAVE_ISO_FORTRAN_ENV="1"
AC_DEFINE([HAVE_ISO_FORTRAN_ENV], [1], [Define if Fortran supports ISO_FORTRAN_ENV (F08)])
fi
## Set the sizeof function for use later in the fortran tests
if test "X$HAVE_STORAGE_SIZE_FORTRAN" = "Xyes";then
FC_SIZEOF_A="STORAGE_SIZE(a, c_size_t)/STORAGE_SIZE(c_char_'a',c_size_t)"
FC_SIZEOF_B="STORAGE_SIZE(b, c_size_t)/STORAGE_SIZE(c_char_'a',c_size_t)"
FC_SIZEOF_C="STORAGE_SIZE(c, c_size_t)/STORAGE_SIZE(c_char_'a',c_size_t)"
else
if test "X$HAVE_SIZEOF_FORTRAN" = "Xyes";then
FC_SIZEOF_A="SIZEOF(a)"
FC_SIZEOF_B="SIZEOF(b)"
FC_SIZEOF_C="SIZEOF(c)"
else
## If neither intrinsic functions SIZEOF or STORAGE_SIZE is available then stop configure with an error
AC_MSG_ERROR([Fortran compiler requires either intrinsic functions SIZEOF or STORAGE_SIZE])
fi
fi
## Check KIND and size of native integer
PAC_FC_NATIVE_INTEGER
## Find all available KINDs
if test "X$HAVE_ISO_FORTRAN_ENV" = "X1";then
PAC_FC_AVAIL_KINDS_F08
else
PAC_FC_AVAIL_KINDS
fi
## Find all SIZEOFs for available KINDs
PAC_FC_SIZEOF_INT_KINDS
PAC_FC_SIZEOF_REAL_KINDS
AC_SUBST([PAC_FC_ALL_REAL_KINDS])
AC_SUBST([PAC_FC_MAX_REAL_PRECISION])
AC_SUBST([PAC_FORTRAN_NUM_INTEGER_KINDS])
AC_SUBST([PAC_FC_ALL_INTEGER_KINDS])
AC_SUBST([PAC_FC_ALL_REAL_KINDS_SIZEOF])
AC_SUBST([PAC_FC_ALL_INTEGER_KINDS_SIZEOF])
AC_SUBST([PAC_FORTRAN_NATIVE_INTEGER_KIND])
AC_SUBST([PAC_FORTRAN_NATIVE_INTEGER_SIZEOF])
AC_SUBST([PAC_FORTRAN_NATIVE_REAL_KIND])
AC_SUBST([PAC_FORTRAN_NATIVE_REAL_SIZEOF])
AC_SUBST([PAC_FORTRAN_NATIVE_DOUBLE_KIND])
AC_SUBST([PAC_FORTRAN_NATIVE_DOUBLE_SIZEOF])
AC_SUBST([HAVE_Fortran_INTEGER_SIZEOF_16])
AC_SUBST([FORTRAN_HAVE_C_LONG_DOUBLE])
AC_SUBST([FORTRAN_C_LONG_DOUBLE_IS_UNIQUE])
AC_SUBST([FORTRAN_C_BOOL_IS_UNIQUE])