dnl Process this file with autoconf to produce a configure script.

dnl Define the fftw version number as M4 macros, so that we can enforce

dnl the invariant that the minor version number in FFTW-X.Y.MINOR is the same

dnl as the revision number in SHARED_VERSION_INFO.

define(FFTW_MAJOR_VERSION, 3.3)dnl

define(FFTW_MINOR_VERSION, 9)dnl

dnl Version number of the FFTW source package.

AC_INIT(fftw, FFTW_MAJOR_VERSION.FFTW_MINOR_VERSION, fftw@fftw.org)

AC_CONFIG_SRCDIR(kernel/ifftw.h)

dnl Version number for libtool shared libraries. Libtool wants a string

dnl of the form CURRENT:REVISION:AGE. We adopt the convention that

dnl REVISION is the same as the FFTW minor version number.

dnl fftw-3.1.x was 4:x:1

dnl fftw-3.2.x was 5:x:2

dnl fftw-3.3.x was 6:x:3 for x < 4

dnl fftw-3.3.4 was 7:x:4

dnl fftw-3.3.5 was 8:x:5 (added planner hooks)

dnl fftw-3.3.6 was 8:x:6 (8:x:6 is a bug, should have been 8:x:5. No API changes)

dnl fftw-3.3.6.1 fixes the 8:x:6 screwup

dnl fftw-3.3.7 was 8:x:5 (No API changes)

dnl fftw-3.3.8 was 8:x:5 (No API changes)

dnl fftw-3.3.9 was 8:x:5 (No API changes)

SHARED_VERSION_INFO="8:FFTW_MINOR_VERSION:5" # CURRENT:REVISION:AGE

AM_INIT_AUTOMAKE(1.7)

AM_CONFIG_HEADER(config.h)

AC_CONFIG_MACRO_DIR([m4])

AM_MAINTAINER_MODE

AC_SUBST(SHARED_VERSION_INFO)

AC_DISABLE_SHARED dnl to hell with shared libraries

AC_CANONICAL_HOST

dnl configure options

case "${host_cpu}" in

powerpc*) arch_prefers_fma=yes;;

ia64*) arch_prefers_fma=yes;;

hppa*) arch_prefers_fma=yes;;

mips64*) arch_prefers_fma=yes;;

*) arch_prefers_fma=no;;

esac

AC_ARG_ENABLE(debug, [AC_HELP_STRING([--enable-debug],[compile fftw with extra runtime checks for debugging])], ok=$enableval, ok=no)

if test "$ok" = "yes"; then

AC_DEFINE(FFTW_DEBUG,1,[Define to enable extra FFTW debugging code.])

fi

AC_ARG_ENABLE(doc, [AC_HELP_STRING([--disable-doc],[disable building the documentation])], build_doc=$enableval, build_doc=yes)

AM_CONDITIONAL(BUILD_DOC, test x"$build_doc" = xyes)

AC_ARG_ENABLE(random-estimator, [AC_HELP_STRING([--enable-random-estimator],[enable pseudorandom estimator (debugging hack)])], ok=$enableval, ok=no)

if test "$ok" = "yes"; then

AC_DEFINE(FFTW_RANDOM_ESTIMATOR,1,[Define to enable pseudorandom estimate planning for debugging.])

CHECK_PL_OPTS="--estimate"

fi

AC_ARG_ENABLE(alloca, [AC_HELP_STRING([--disable-alloca],[disable use of the alloca() function (may be broken on mingw64)])], ok=$enableval, ok=yes)

if test "$ok" = "yes"; then

AC_DEFINE(FFTW_ENABLE_ALLOCA,1,[Define to enable the use of alloca().])

fi

AC_ARG_ENABLE(single, [AC_HELP_STRING([--enable-single],[compile fftw in single precision])], ok=$enableval, ok=no)

AC_ARG_ENABLE(float, [AC_HELP_STRING([--enable-float],[synonym for --enable-single])], ok=$enableval)

if test "$ok" = "yes"; then

AC_DEFINE(FFTW_SINGLE,1,[Define to compile in single precision.])

AC_DEFINE(BENCHFFT_SINGLE,1,[Define to compile in single precision.])

PRECISION=s

else

PRECISION=d

fi

AM_CONDITIONAL(SINGLE, test "$ok" = "yes")

AC_ARG_ENABLE(long-double, [AC_HELP_STRING([--enable-long-double],[compile fftw in long-double precision])], ok=$enableval, ok=no)

if test "$ok" = "yes"; then

if test "$PRECISION" = "s"; then

AC_MSG_ERROR([--enable-single/--enable-long-double conflict])

fi

AC_DEFINE(FFTW_LDOUBLE,1,[Define to compile in long-double precision.])

AC_DEFINE(BENCHFFT_LDOUBLE,1,[Define to compile in long-double precision.])

PRECISION=l

fi

AM_CONDITIONAL(LDOUBLE, test "$ok" = "yes")

AC_ARG_ENABLE(quad-precision, [AC_HELP_STRING([--enable-quad-precision],[compile fftw in quadruple precision if available])], ok=$enableval, ok=no)

if test "$ok" = "yes"; then

if test "$PRECISION" != "d"; then

AC_MSG_ERROR([conflicting precisions specified])

fi

AC_DEFINE(FFTW_QUAD,1,[Define to compile in quad precision.])

AC_DEFINE(BENCHFFT_QUAD,1,[Define to compile in quad precision.])

PRECISION=q

fi

AM_CONDITIONAL(QUAD, test "$ok" = "yes")

AC_SUBST(PRECISION)

AC_SUBST(CHECK_PL_OPTS)

dnl SSE/SSE2 theory:

dnl

dnl Historically, you had to supply --enable-sse in single precision and --enable-sse2

dnl in double precision.

dnl

dnl This behavior is pointless in 2016. --enable-sse2 now works in both precisions,

dnl and is interpreted as --enable-sse in single precision. The old flag --enable--se

dnl is still supported in single-precision only.

AC_ARG_ENABLE(sse, [AC_HELP_STRING([--enable-sse],[enable SSE optimizations])], have_sse=$enableval, have_sse=no)

if test "$have_sse" = "yes"; then

if test "$PRECISION" != "s"; then

AC_MSG_ERROR([SSE requires single precision])

fi

fi

AC_ARG_ENABLE(sse2, [AC_HELP_STRING([--enable-sse2],[enable SSE/SSE2 optimizations])], have_sse2=$enableval, have_sse2=no)

if test "$have_sse" = "yes"; then have_sse2=yes; fi

if test "$have_sse2" = "yes"; then

AC_DEFINE(HAVE_SSE2,1,[Define to enable SSE/SSE2 optimizations.])

if test "$PRECISION" != "d" -a "$PRECISION" != "s"; then

AC_MSG_ERROR([SSE2 requires single or double precision])

fi

fi

AM_CONDITIONAL(HAVE_SSE2, test "$have_sse2" = "yes")

AC_ARG_ENABLE(avx, [AC_HELP_STRING([--enable-avx],[enable AVX optimizations])], have_avx=$enableval, have_avx=no)

if test "$have_avx" = "yes"; then

AC_DEFINE(HAVE_AVX,1,[Define to enable AVX optimizations.])

if test "$PRECISION" != "d" -a "$PRECISION" != "s"; then

AC_MSG_ERROR([AVX requires single or double precision])

fi

fi

AM_CONDITIONAL(HAVE_AVX, test "$have_avx" = "yes")

AC_ARG_ENABLE(avx2, [AC_HELP_STRING([--enable-avx2],[enable AVX2 optimizations])], have_avx2=$enableval, have_avx2=no)

if test "$have_avx2" = "yes"; then

AC_DEFINE(HAVE_AVX2,1,[Define to enable AVX2 optimizations.])

if test "$PRECISION" != "d" -a "$PRECISION" != "s"; then

AC_MSG_ERROR([AVX2 requires single or double precision])

fi

fi

AM_CONDITIONAL(HAVE_AVX2, test "$have_avx2" = "yes")

AC_ARG_ENABLE(avx512, [AC_HELP_STRING([--enable-avx512],[enable AVX512 optimizations])], have_avx512=$enableval, have_avx512=no)

if test "$have_avx512" = "yes"; then

AC_DEFINE(HAVE_AVX512,1,[Define to enable AVX512 optimizations.])

if test "$PRECISION" != "d" -a "$PRECISION" != "s"; then

AC_MSG_ERROR([AVX512 requires single or double precision])

fi

fi

AM_CONDITIONAL(HAVE_AVX512, test "$have_avx512" = "yes")

dnl 128-bit AVX is special. There is no reason to use it on Intel processors

dnl since SSE2 is just as fast. However, on AMD processors we can both use

dnl FMA4, and 128-bit SIMD is better than 256-bit since core pairs in a

dnl compute unit can execute two 128-bit instructions independently.

AC_ARG_ENABLE(avx-128-fma, [AC_HELP_STRING([--enable-avx-128-fma],[enable AVX128/FMA optimizations])], have_avx_128_fma=$enableval, have_avx_128_fma=no)

if test "$have_avx_128_fma" = "yes"; then

AC_DEFINE(HAVE_AVX_128_FMA,1,[Define to enable 128-bit FMA AVX optimization])

AVX_128_FMA_CFLAGS="${AVX_CFLAGS} -mfma4"

AC_SUBST(AVX_128_FMA_CFLAGS)

fi

AM_CONDITIONAL(HAVE_AVX_128_FMA, test "$have_avx_128_fma" = "yes")

AC_ARG_ENABLE(kcvi, [AC_HELP_STRING([--enable-kcvi],[enable Knights Corner vector instructions optimizations])], have_kcvi=$enableval, have_kcvi=no)

if test "$have_kcvi" = "yes"; then

AC_DEFINE(HAVE_KCVI,1,[Define to enable KCVI optimizations.])

if test "$PRECISION" != "d" -a "$PRECISION" != "s"; then

AC_MSG_ERROR([Knights Corner vector instructions requires single or double precision])

fi

fi

AM_CONDITIONAL(HAVE_KCVI, test "$have_kcvi" = "yes")

AC_ARG_ENABLE(altivec, [AC_HELP_STRING([--enable-altivec],[enable Altivec optimizations])], have_altivec=$enableval, have_altivec=no)

if test "$have_altivec" = "yes"; then

AC_DEFINE(HAVE_ALTIVEC,1,[Define to enable Altivec optimizations.])

if test "$PRECISION" != "s"; then

AC_MSG_ERROR([Altivec requires single precision])

fi

fi

AM_CONDITIONAL(HAVE_ALTIVEC, test "$have_altivec" = "yes")

AC_ARG_ENABLE(vsx, [AC_HELP_STRING([--enable-vsx],[enable IBM VSX optimizations])], have_vsx=$enableval, have_vsx=no)

if test "$have_vsx" = "yes"; then

AC_DEFINE(HAVE_VSX,1,[Define to enable IBM VSX optimizations.])

fi

AM_CONDITIONAL(HAVE_VSX, test "$have_vsx" = "yes")

AC_ARG_ENABLE(neon, [AC_HELP_STRING([--enable-neon],[enable ARM NEON optimizations])], have_neon=$enableval, have_neon=no)

if test "$have_neon" = "yes"; then

AC_DEFINE(HAVE_NEON,1,[Define to enable ARM NEON optimizations.])

case "${host_cpu}" in

aarch64)

;;

*)

if test "$PRECISION" != "s"; then

AC_MSG_ERROR([NEON requires single precision])

fi

;;

esac

fi

AM_CONDITIONAL(HAVE_NEON, test "$have_neon" = "yes")

AC_ARG_ENABLE(armv8-pmccntr-el0, [AC_HELP_STRING([--enable-armv8-pmccntr-el0],[enable the cycle counter on ARMv8 via the PMCCNTR_EL0 register (see README-perfcounters for details and mandatory instructions)])], have_armv8pmccntrel0=$enableval)

if test "$have_armv8pmccntrel0"x = "yes"x; then

AC_DEFINE(HAVE_ARMV8_PMCCNTR_EL0,1,[Define if you have enabled the PMCCNTR_EL0 cycle counter on ARMv8])

fi

AC_ARG_ENABLE(armv8-cntvct-el0, [AC_HELP_STRING([--enable-armv8-cntvct-el0],[enable the cycle counter on ARMv8 via the CNTVCT_EL0 register (see README-perfcounters for details and mandatory instructions)])], have_armv8cntvctel0=$enableval)

if test "$have_armv8cntvctel0"x = "yes"x; then

AC_DEFINE(HAVE_ARMV8_CNTVCT_EL0,1,[Define if you have enabled the CNTVCT_EL0 cycle counter on ARMv8])

fi

AC_ARG_ENABLE(armv7a-cntvct, [AC_HELP_STRING([--enable-armv7a-cntvct],[enable the cycle counter on Armv7a via the CNTVCT register (see README-perfcounters for details and mandatory instructions)])], have_armv7acntvct=$enableval)

if test "$have_armv7acntvct"x = "yes"x; then

AC_DEFINE(HAVE_ARMV7A_CNTVCT,1,[Define if you have enabled the CNTVCT cycle counter on ARMv7a])

fi

AC_ARG_ENABLE(armv7a-pmccntr, [AC_HELP_STRING([--enable-armv7a-pmccntr],[enable the cycle counter on Armv7a via the PMCCNTR register (see README-perfcounters for details and mandatory instructions)])], have_armv7apmccntr=$enableval)

if test "$have_armv7apmccntr"x = "yes"x; then

AC_DEFINE(HAVE_ARMV7A_PMCCNTR,1,[Define if you have enabled the PMCCNTR cycle counter on ARMv7a])

fi

AC_ARG_ENABLE(generic-simd128, [AC_HELP_STRING([--enable-generic-simd128],[enable generic (gcc) 128-bit SIMD optimizations])], have_generic_simd128=$enableval, have_generic_simd128=no)

if test "$have_generic_simd128" = "yes"; then

AC_DEFINE(HAVE_GENERIC_SIMD128,1,[Define to enable generic (gcc) 128-bit SIMD optimizations.])

fi

AM_CONDITIONAL(HAVE_GENERIC_SIMD128, test "$have_generic_simd128" = "yes")

AC_ARG_ENABLE(generic-simd256, [AC_HELP_STRING([--enable-generic-simd256],[enable generic (gcc) 256-bit SIMD optimizations])], have_generic_simd256=$enableval, have_generic_simd256=no)

if test "$have_generic_simd256" = "yes"; then

AC_DEFINE(HAVE_GENERIC_SIMD256,1,[Define to enable generic (gcc) 256-bit SIMD optimizations.])

fi

AM_CONDITIONAL(HAVE_GENERIC_SIMD256, test "$have_generic_simd256" = "yes")

dnl FIXME:

dnl AC_ARG_ENABLE(mips-ps, [AC_HELP_STRING([--enable-mips-ps],[enable MIPS pair-single optimizations])], have_mips_ps=$enableval, have_mips_ps=no)

dnl if test "$have_mips_ps" = "yes"; then

dnl AC_DEFINE(HAVE_MIPS_PS,1,[Define to enable MIPS paired-single optimizations.])

dnl if test "$PRECISION" != "s"; then

dnl AC_MSG_ERROR([MIPS paired-single requires single precision])

dnl fi

dnl fi

dnl AM_CONDITIONAL(HAVE_MIPS_PS, test "$have_mips_ps" = "yes")

AC_ARG_WITH(slow-timer, [AC_HELP_STRING([--with-slow-timer],[use low-precision timers (SLOW)])], with_slow_timer=$withval, with_slow_timer=no)

if test "$with_slow_timer" = "yes"; then

AC_DEFINE(WITH_SLOW_TIMER,1,[Use low-precision timers, making planner very slow])

fi

AC_ARG_ENABLE(mips_zbus_timer, [AC_HELP_STRING([--enable-mips-zbus-timer],[use MIPS ZBus cycle-counter])], have_mips_zbus_timer=$enableval, have_mips_zbus_timer=no)

if test "$have_mips_zbus_timer" = "yes"; then

AC_DEFINE(HAVE_MIPS_ZBUS_TIMER,1,[Define to enable use of MIPS ZBus cycle-counter.])

fi

AC_ARG_WITH(our-malloc, [AC_HELP_STRING([--with-our-malloc],[use our aligned malloc (helpful for Win32)])], with_our_malloc=$withval, with_our_malloc=no)

AC_ARG_WITH(our-malloc16, [AC_HELP_STRING([--with-our-malloc16],[Obsolete alias for --with-our-malloc16])], with_our_malloc=$withval)

if test "$with_our_malloc" = "yes"; then

AC_DEFINE(WITH_OUR_MALLOC,1,[Use our own aligned malloc routine; mainly helpful for Windows systems lacking aligned allocation system-library routines.])

fi

AC_ARG_WITH(windows-f77-mangling, [AC_HELP_STRING([--with-windows-f77-mangling],[use common Win32 Fortran interface styles])], with_windows_f77_mangling=$withval, with_windows_f77_mangling=no)

if test "$with_windows_f77_mangling" = "yes"; then

AC_DEFINE(WINDOWS_F77_MANGLING,1,[Use common Windows Fortran mangling styles for the Fortran interfaces.])

fi

AC_ARG_WITH(incoming-stack-boundary, [AC_HELP_STRING([--with-incoming-stack-boundary=X],[Assume that stack is aligned to (1<<X) bytes])], with_incoming_stack_boundary=$withval, with_incoming_stack_boundary=no)

AC_ARG_ENABLE(fma, [AC_HELP_STRING([--enable-fma],[enable if the machine architecture "naturally" prefers fused multiply-add instructions])], arch_prefers_fma=$enableval)

if test "$arch_prefers_fma"x = "yes"x; then

AC_DEFINE(ARCH_PREFERS_FMA,1,[Define if the machine architecture "naturally" prefers fused multiply-add instructions])

fi

dnl compute library suffix

case "$PRECISION" in

s) PREC_SUFFIX=f;;

d) PREC_SUFFIX=;;

l) PREC_SUFFIX=l;;

q) PREC_SUFFIX=q;;

esac

AC_SUBST(PREC_SUFFIX)

dnl Checks for programs.

AC_PROG_CC

AM_PROG_CC_C_O

AX_COMPILER_VENDOR

AC_PROG_CC_STDC

AC_PROG_INSTALL

AC_PROG_LN_S

AC_PROG_MAKE_SET

AC_LIBTOOL_WIN32_DLL

AC_PROG_LIBTOOL

AC_PROG_RANLIB

AC_CHECK_PROG(OCAMLBUILD, ocamlbuild, ocamlbuild)

dnl -----------------------------------------------------------------------

AC_ARG_ENABLE(mpi, [AC_HELP_STRING([--enable-mpi],[compile FFTW MPI library])], enable_mpi=$enableval, enable_mpi=no)

if test "$enable_mpi" = "yes"; then

if test $PRECISION = q; then

AC_MSG_ERROR([quad precision is not supported in MPI])

fi

ACX_MPI([],[AC_MSG_ERROR([could not find mpi library for --enable-mpi])])

AC_CHECK_PROG(MPIRUN, mpirun, mpirun)

AC_SUBST(MPIRUN)

save_CC=$CC

CC=$MPICC

AC_CHECK_SIZEOF(MPI_Fint, [], [#include <mpi.h>])

CC=$save_CC

if test 0 = $ac_cv_sizeof_MPI_Fint; then

AC_MSG_WARN([sizeof(MPI_Fint) test failed]);

dnl As a backup, assume Fortran integer == C int

AC_CHECK_SIZEOF(int)

if test 0 = $ac_cv_sizeof_int; then AC_MSG_ERROR([sizeof(int) test failed]); fi

ac_cv_sizeof_MPI_Fint=$ac_cv_sizeof_int

fi

C_MPI_FINT=C_INT`expr $ac_cv_sizeof_MPI_Fint \* 8`_T

AC_SUBST(C_MPI_FINT)

fi

AM_CONDITIONAL(MPI, test "$enable_mpi" = "yes")

dnl -----------------------------------------------------------------------

dnl determine CFLAGS first

AX_CC_MAXOPT

case "${ax_cv_c_compiler_vendor}" in

intel) # Stop icc from defining __GNUC__, except on MacOS where this fails

case "${host_os}" in

*darwin*) ;; # icc -no-gcc fails to compile some system headers

*)

AX_CHECK_COMPILER_FLAGS([-no-gcc], [CC="$CC -no-gcc"])

;;

esac

;;

hp) # must (sometimes) manually increase cpp limits to handle fftw3.h

AX_CHECK_COMPILER_FLAGS([-Wp,-H128000],

[CC="$CC -Wp,-H128000"])

;;

portland) # -Masmkeyword required for asm("") cycle counters

AX_CHECK_COMPILER_FLAGS([-Masmkeyword],

[CC="$CC -Masmkeyword"])

;;

esac

dnl Determine SIMD CFLAGS at least for gcc and icc

case "${ax_cv_c_compiler_vendor}" in

gnu|intel)

# SSE/SSE2

if test "$have_sse2" = "yes" -a "x$SSE2_CFLAGS" = x; then

if test "$PRECISION" = d; then flag=msse2; else flag=msse; fi

AX_CHECK_COMPILER_FLAGS(-$flag, [SSE2_CFLAGS="-$flag"],

[AC_MSG_ERROR([Need a version of gcc with -$flag])])

fi

# AVX

if test "$have_avx" = "yes" -a "x$AVX_CFLAGS" = x; then

AX_CHECK_COMPILER_FLAGS(-mavx, [AVX_CFLAGS="-mavx"],

[AC_MSG_ERROR([Need a version of gcc with -mavx])])

fi

# AVX2

# gcc-4.8 works with -march=core-avx2, but -mavx2 is not enough.

# Later versions seem to happy with -mavx2, so try the arch one first.

if test "$have_avx2" = "yes" -a "x$AVX2_CFLAGS" = x; then

AX_CHECK_COMPILER_FLAGS(-march=core-avx2, [AVX2_CFLAGS="-march=core-avx2"],

[AX_CHECK_COMPILER_FLAGS(-mavx2, [AVX2_CFLAGS="-mavx2"],

[AC_MSG_ERROR([Need a version of gcc with either -march=core-avx2 or -mavx2])])])

AX_CHECK_COMPILER_FLAGS(-mfma, [AVX2_CFLAGS="$AVX2_CFLAGS -mfma"],

[AC_MSG_WARN([Need a version of gcc with -mfma (harmless for icc)])])

fi

# AVX512

if test "$have_avx512" = "yes" -a "x$AVX512_CFLAGS" = x; then

AX_CHECK_COMPILER_FLAGS(-mavx512f, [AVX512_CFLAGS="-mavx512f"],

[AC_MSG_ERROR([Need a version of gcc with -mavx512f])])

fi

if test "$host_vendor" = "apple"; then

# We need to tell gcc to use an external assembler to get AVX/AVX2 with gcc on OS X

AX_CHECK_COMPILER_FLAGS([-Wa,-q], [CFLAGS="$CFLAGS -Wa,-q"])

# Disable the new compact unwinding format so we avoid warnings/potential errors.

AX_CHECK_COMPILER_FLAGS([-Wl,-no_compact_unwind], [CFLAGS="$CFLAGS -Wl,-no_compact_unwind"])

fi

# KCVI

if test "$have_kcvi" = "yes" -a "x$KCVI_CFLAGS" = x; then

AX_CHECK_COMPILER_FLAGS(-mmic, [KCVI_CFLAGS="-mmic"],

[AC_MSG_ERROR([Need a version of icc with -mmic])])

fi

if test "$have_altivec" = "yes" -a "x$ALTIVEC_CFLAGS" = x; then

# -DFAKE__VEC__ is a workaround because gcc-3.3 does not

# #define __VEC__ with -maltivec.

AX_CHECK_COMPILER_FLAGS(-faltivec, [ALTIVEC_CFLAGS="-faltivec"],

[AX_CHECK_COMPILER_FLAGS(-maltivec -mabi=altivec,

[ALTIVEC_CFLAGS="-maltivec -mabi=altivec -DFAKE__VEC__"],

[AX_CHECK_COMPILER_FLAGS(-fvec, [ALTIVEC_CFLAGS="-fvec"],

[AC_MSG_ERROR([Need a version of gcc with -maltivec])])])])

fi

case "${host_cpu}" in

aarch64)

;;

*)

if test "$have_neon" = "yes" -a "x$NEON_CFLAGS" = x; then

AX_CHECK_COMPILER_FLAGS(-mfpu=neon, [NEON_CFLAGS="-mfpu=neon"],

[AC_MSG_ERROR([Need a version of gcc with -mfpu=neon])])

fi

;;

esac

if test "$have_vsx" = "yes" -a "x$VSX_CFLAGS" = x; then

AX_CHECK_COMPILER_FLAGS(-mvsx, [VSX_CFLAGS="-mvsx"],

[AC_MSG_ERROR([Need a version of gcc with -mvsx])])

fi

dnl FIXME:

dnl elif test "$have_mips_ps" = "yes"; then

dnl # Just punt here and use only new 4.2 compiler :(

dnl # Should add section for older compilers...

dnl AX_CHECK_COMPILER_FLAGS(-mpaired-single,

dnl [SIMD_CFLAGS="-mpaired-single"],

dnl #[AC_MSG_ERROR([Need a version of gcc with -mpaired-single])])

dnl [AX_CHECK_COMPILER_FLAGS(-march=mips64,

dnl [SIMD_CFLAGS="-march=mips64"],

dnl [AC_MSG_ERROR(

dnl [Need a version of gcc with -mpaired-single or -march=mips64])

dnl ])])

dnl fi

;;

clang)

if test "$have_avx" = "yes" -a "x$AVX_CFLAGS" = x; then

AX_CHECK_COMPILER_FLAGS(-mavx, [AVX_CFLAGS="-mavx"],

[AC_MSG_ERROR([Need a version of clang with -mavx])])

fi

if test "$have_avx2" = "yes" -a "x$AVX2_CFLAGS" = x; then

AX_CHECK_COMPILER_FLAGS(-mavx2, [AVX2_CFLAGS="-mavx2"],

[AC_MSG_ERROR([Need a version of clang with -mavx2])])

AX_CHECK_COMPILER_FLAGS(-mfma, [AVX2_CFLAGS="$AVX2_CFLAGS -mfma"])

fi

if test "$have_vsx" = "yes" -a "x$VSX_CFLAGS" = x; then

# clang appears to need both -mvsx and -maltivec for VSX

AX_CHECK_COMPILER_FLAGS(-maltivec, [VSX_CFLAGS="-maltivec"],

[AC_MSG_ERROR([Need a version of gcc with -maltivec])])

AX_CHECK_COMPILER_FLAGS(-mvsx, [VSX_CFLAGS="-mvsx $VSX_CFLAGS"],

[AC_MSG_ERROR([Need a version of gcc with -mvsx])])

fi

;;

ibm)

if test "$have_vsx" = "yes" -a "x$VSX_CFLAGS" = x; then

# Note that IBM xlC uses -qaltivec for VSX too.

AX_CHECK_COMPILER_FLAGS(-qaltivec, [VSX_CFLAGS="-qaltivec"],

[AC_MSG_ERROR([Need a version of gcc with -qaltivec])])

fi

;;

esac

AC_SUBST(SSE2_CFLAGS)

AC_SUBST(AVX_CFLAGS)

AC_SUBST(AVX2_CFLAGS)

AC_SUBST(AVX512_CFLAGS)

AC_SUBST(KCVI_CFLAGS)

AC_SUBST(ALTIVEC_CFLAGS)

AC_SUBST(VSX_CFLAGS)

AC_SUBST(NEON_CFLAGS)

dnl add stack alignment CFLAGS if so requested

if test "$with_incoming_stack_boundary"x != "no"x; then

case "${ax_cv_c_compiler_vendor}" in

gnu)

tentative_flags="-mincoming-stack-boundary=$with_incoming_stack_boundary";

AX_CHECK_COMPILER_FLAGS($tentative_flags,

[STACK_ALIGN_CFLAGS=$tentative_flags])

;;

esac

fi

AC_SUBST(STACK_ALIGN_CFLAGS)

dnl Checks for header files.

AC_HEADER_STDC

AC_CHECK_HEADERS([fcntl.h fenv.h limits.h malloc.h stddef.h sys/time.h])

dnl c_asm.h: Header file for enabling asm() on Digital Unix

dnl intrinsics.h: cray unicos

dnl sys/sysctl.h: MacOS X altivec detection

dnl altivec.h requires $ALTIVEC_CFLAGS (we use this for VSX too, which uses the same header)

save_CFLAGS="$CFLAGS"

save_CPPFLAGS="$CPPFLAGS"

CFLAGS="$CFLAGS $ALTIVEC_CFLAGS $VSX_CFLAGS"

CPPFLAGS="$CPPFLAGS $ALTIVEC_CFLAGS $VSX_CFLAGS"

AC_CHECK_HEADERS([altivec.h])

CFLAGS="$save_CFLAGS"

CPPFLAGS="$save_CPPFLAGS"

dnl Checks for typedefs, structures, and compiler characteristics.

AC_C_CONST

AC_C_INLINE

AC_TYPE_SIZE_T

AC_TYPE_UINT32_T

AC_TYPE_UINT64_T

AC_HEADER_TIME

AC_CHECK_TYPE([long double],

[AC_DEFINE(HAVE_LONG_DOUBLE, 1, [Define to 1 if the compiler supports `long double'])],

[

if test $PRECISION = l; then

AC_MSG_ERROR([long double is not a supported type with your compiler.])

fi

])

AC_CHECK_TYPE([hrtime_t],[AC_DEFINE(HAVE_HRTIME_T, 1, [Define to 1 if hrtime_t is defined in <sys/time.h>])],,

[

#if HAVE_SYS_TIME_H

#include <sys/time.h>

#endif

])

AC_CHECK_SIZEOF(int)

AC_CHECK_SIZEOF(unsigned int)

AC_CHECK_SIZEOF(long)

AC_CHECK_SIZEOF(unsigned long)

AC_CHECK_SIZEOF(long long)

AC_CHECK_SIZEOF(unsigned long long)

AC_CHECK_SIZEOF(size_t)

AC_CHECK_SIZEOF(ptrdiff_t)

AC_CHECK_TYPES([ptrdiff_t])

AC_CHECK_TYPES(uintptr_t, [], [AC_CHECK_SIZEOF(void *)], [$ac_includes_default

#ifdef HAVE_STDINT_H

# include <stdint.h>

#endif])

AC_CHECK_SIZEOF(float)

AC_CHECK_SIZEOF(double)

dnl Check sizeof fftw_r2r_kind for Fortran interface [it has == sizeof(int)

dnl for years, but being paranoid]. Note: the definition here must match

dnl the one in api/fftw3.h!

AC_CHECK_SIZEOF(fftw_r2r_kind, [], [typedef enum {

FFTW_R2HC=0, FFTW_HC2R=1, FFTW_DHT=2,

FFTW_REDFT00=3, FFTW_REDFT01=4, FFTW_REDFT10=5, FFTW_REDFT11=6,

FFTW_RODFT00=7, FFTW_RODFT01=8, FFTW_RODFT10=9, FFTW_RODFT11=10

} fftw_r2r_kind;])

if test 0 = $ac_cv_sizeof_fftw_r2r_kind; then AC_MSG_ERROR([sizeof(fftw_r2r_kind) test failed]); fi

C_FFTW_R2R_KIND=C_INT`expr $ac_cv_sizeof_fftw_r2r_kind \* 8`_T

AC_SUBST(C_FFTW_R2R_KIND)

dnl Checks for library functions.

AC_FUNC_ALLOCA

AC_FUNC_STRTOD

AC_FUNC_VPRINTF

AC_CHECK_LIB(m, sin)

if test $PRECISION = q; then

AX_GCC_VERSION(4,6,0,[],[AC_MSG_ERROR([gcc 4.6 or later required for quad precision support])])

AC_CHECK_LIB(quadmath, sinq, [], [AC_MSG_ERROR([quad precision requires libquadmath for quad-precision trigonometric routines])])

LIBQUADMATH=-lquadmath

fi

AC_SUBST(LIBQUADMATH)

AC_CHECK_FUNCS([BSDgettimeofday gettimeofday gethrtime read_real_time time_base_to_time drand48 sqrt memset posix_memalign memalign _mm_malloc _mm_free clock_gettime mach_absolute_time sysctl abort sinl cosl snprintf memmove strchr getpagesize])

AC_CHECK_DECLS([sinl, cosl, sinq, cosq],,,[#include <math.h>])

AC_CHECK_DECLS([memalign],,,[

#ifdef HAVE_MALLOC_H

#include <malloc.h>

#endif])

AC_CHECK_DECLS([drand48, srand48, posix_memalign]) dnl in stdlib.h

dnl Cray UNICOS _rtc() (real-time clock) intrinsic

AC_MSG_CHECKING([for _rtc intrinsic])

rtc_ok=yes

AC_TRY_LINK([#ifdef HAVE_INTRINSICS_H

#include <intrinsics.h>

#endif], [_rtc()], [AC_DEFINE(HAVE__RTC,1,[Define if you have the UNICOS _rtc() intrinsic.])], [rtc_ok=no])

AC_MSG_RESULT($rtc_ok)

if test "$PRECISION" = "l"; then

AC_CHECK_FUNCS([cosl sinl tanl], [], [AC_MSG_ERROR([long-double precision requires long-double trigonometric routines])])

fi

AC_MSG_CHECKING([for isnan])

AC_TRY_LINK([#include <math.h>

], if (!isnan(3.14159)) isnan(2.7183);, ok=yes, ok=no)

if test "$ok" = "yes"; then

AC_DEFINE(HAVE_ISNAN,1,[Define if the isnan() function/macro is available.])

fi

AC_MSG_RESULT(${ok})

dnl TODO

AX_GCC_ALIGNS_STACK()

dnl override CFLAGS selection when debugging

if test "${enable_debug}" = "yes"; then

CFLAGS="-g"

fi

dnl add gcc warnings, in debug/maintainer mode only

if test "$enable_debug" = yes || test "$USE_MAINTAINER_MODE" = yes; then

if test "$ac_test_CFLAGS" != "set"; then

if test $ac_cv_prog_gcc = yes; then

CFLAGS="$CFLAGS -Wall -W -Wcast-qual -Wpointer-arith -Wcast-align -pedantic -Wno-long-long -Wshadow -Wbad-function-cast -Wwrite-strings -Wstrict-prototypes -Wredundant-decls -Wnested-externs" # -Wundef -Wconversion -Wmissing-prototypes -Wmissing-declarations

fi

fi

fi

dnl check for a proper indent in maintainer mode

if test "$USE_MAINTAINER_MODE" = yes; then

AC_PATH_PROG(INDENT, indent, indent)

# if INDENT is set to 'indent' then we didn't find indent

if test "$INDENT" != indent ; then

AC_MSG_CHECKING(if $INDENT is GNU indent)

if $INDENT --version 2>/dev/null | head -n 1|grep "GNU indent" > /dev/null ; then

AC_MSG_RESULT(yes)

INDENT="$INDENT -kr -cs -i5 -l800 -fca -nfc1 -sc -sob -cli4 -TR -Tplanner -TV"

else

AC_MSG_RESULT(no)

AC_MSG_WARN($INDENT does not appear to be GNU indent.)

fi

else

AC_MSG_WARN(no indent program found: codelets will be ugly)

INDENT=cat

fi

fi

dnl -----------------------------------------------------------------------

AC_ARG_ENABLE(fortran, [AC_HELP_STRING([--disable-fortran],[don't include Fortran-callable wrappers])], enable_fortran=$enableval, enable_fortran=yes)

if test "$enable_fortran" = "yes"; then

AC_PROG_F77

if test -z "$F77"; then

enable_fortran=no

AC_MSG_WARN([*** Couldn't find f77 compiler; using default Fortran wrappers.])

else

AC_F77_DUMMY_MAIN([], [enable_fortran=no

AC_MSG_WARN([*** Couldn't figure out how to link C and Fortran; using default Fortran wrappers.])])

fi

else

AC_DEFINE([DISABLE_FORTRAN], 1, [Define to disable Fortran wrappers.])

fi

if test "x$enable_fortran" = xyes; then

AC_F77_WRAPPERS

AC_F77_FUNC(f77foo)

AC_F77_FUNC(f77_foo)

f77_foo2=`echo $f77foo | sed 's/77/77_/'`

if test "$f77_foo" = "$f77_foo2"; then

AC_DEFINE(F77_FUNC_EQUIV, 1, [Define if F77_FUNC and F77_FUNC_ are equivalent.])

# Include g77 wrappers by default for GNU systems or gfortran

with_g77_wrappers=$ac_cv_f77_compiler_gnu

case $host_os in *gnu*) with_g77_wrappers=yes ;; esac

fi

else

with_g77_wrappers=no

fi

AC_ARG_WITH(g77-wrappers, [AC_HELP_STRING([--with-g77-wrappers],[force inclusion of g77-compatible wrappers in addition to any other Fortran compiler that is detected])], with_g77_wrappers=$withval)

if test "x$with_g77_wrappers" = "xyes"; then

AC_DEFINE(WITH_G77_WRAPPERS,1,[Include g77-compatible wrappers in addition to any other Fortran wrappers.])

fi

dnl -----------------------------------------------------------------------

have_smp="no"

AC_ARG_ENABLE(openmp, [AC_HELP_STRING([--enable-openmp],[use OpenMP directives for parallelism])], enable_openmp=$enableval, enable_openmp=no)

if test "$enable_openmp" = "yes"; then

AC_DEFINE(HAVE_OPENMP,1,[Define to enable OpenMP])

AX_OPENMP([], [AC_MSG_ERROR([don't know how to enable OpenMP])])

fi

AC_ARG_ENABLE(threads, [AC_HELP_STRING([--enable-threads],[compile FFTW SMP threads library])], enable_threads=$enableval, enable_threads=no)

if test "$enable_threads" = "yes"; then

AC_DEFINE(HAVE_THREADS,1,[Define to enable SMP threads])

fi

AC_ARG_WITH(combined-threads, [AC_HELP_STRING([--with-combined-threads],[combine threads into main libfftw3])], with_combined_threads=$withval, with_combined_threads=no)

if test "$with_combined_threads" = yes; then

if test "$enable_openmp" = "yes"; then

AC_MSG_ERROR([--with-combined-threads incompatible with --enable-openmp])

fi

if test "$enable_threads" != "yes"; then

AC_MSG_ERROR([--with-combined-threads requires --enable-threads])

fi

fi

dnl Check for threads library...

THREADLIBS=""

if test "$enable_threads" = "yes"; then

# Win32 threads are the default on Windows:

if test -z "$THREADLIBS"; then

AC_MSG_CHECKING([for Win32 threads])

AC_TRY_LINK([#include <windows.h>],

[_beginthreadex(0,0,0,0,0,0);],

[THREADLIBS=" "; AC_MSG_RESULT(yes)],

[AC_MSG_RESULT(no)])

fi

# POSIX threads, the default choice everywhere else:

if test -z "$THREADLIBS"; then

ACX_PTHREAD([THREADLIBS="$PTHREAD_LIBS "

CC="$PTHREAD_CC"

AC_DEFINE(USING_POSIX_THREADS, 1, [Define if we have and are using POSIX threads.])])

fi

if test -z "$THREADLIBS"; then

AC_MSG_ERROR([couldn't find threads library for --enable-threads])

fi

AC_DEFINE(HAVE_THREADS, 1, [Define if we have a threads library.])

fi

AC_SUBST(THREADLIBS)

AM_CONDITIONAL(THREADS, test "$enable_threads" = "yes")

AM_CONDITIONAL(OPENMP, test "$enable_openmp" = "yes")

AM_CONDITIONAL(SMP, test "$enable_threads" = "yes" -o "$enable_openmp" = "yes")

AM_CONDITIONAL(COMBINED_THREADS, test x"$with_combined_threads" = xyes)

dnl -----------------------------------------------------------------------

AC_MSG_CHECKING([whether a cycle counter is available])

save_CPPFLAGS=$CPPFLAGS

CPPFLAGS="$CPPFLAGS -I$srcdir/kernel"

AC_TRY_CPP([#include "cycle.h"

#ifndef HAVE_TICK_COUNTER

# error No cycle counter

#endif], [ok=yes], [ok=no])

CPPFLAGS=$save_CPPFLAGS

AC_MSG_RESULT($ok)

if test $ok = no && test "x$with_slow_timer" = xno; then

echo "***************************************************************"

echo "WARNING: No cycle counter found. FFTW will use ESTIMATE mode "

echo " for all plans. See the manual for more information."

echo "***************************************************************"

fi

dnl -----------------------------------------------------------------------

AC_DEFINE_UNQUOTED(FFTW_CC, "$CC $CFLAGS", [C compiler name and flags])

AC_CONFIG_FILES([

Makefile

support/Makefile

genfft/Makefile

kernel/Makefile

simd-support/Makefile

dft/Makefile

dft/scalar/Makefile

dft/scalar/codelets/Makefile

dft/simd/Makefile

dft/simd/common/Makefile

dft/simd/sse2/Makefile

dft/simd/avx/Makefile

dft/simd/avx-128-fma/Makefile

dft/simd/avx2/Makefile

dft/simd/avx2-128/Makefile

dft/simd/avx512/Makefile

dft/simd/kcvi/Makefile

dft/simd/altivec/Makefile

dft/simd/vsx/Makefile

dft/simd/neon/Makefile

dft/simd/generic-simd128/Makefile

dft/simd/generic-simd256/Makefile

rdft/Makefile

rdft/scalar/Makefile

rdft/scalar/r2cf/Makefile

rdft/scalar/r2cb/Makefile

rdft/scalar/r2r/Makefile

rdft/simd/Makefile

rdft/simd/common/Makefile

rdft/simd/sse2/Makefile

rdft/simd/avx/Makefile

rdft/simd/avx-128-fma/Makefile

rdft/simd/avx2/Makefile

rdft/simd/avx2-128/Makefile

rdft/simd/avx512/Makefile

rdft/simd/kcvi/Makefile

rdft/simd/altivec/Makefile

rdft/simd/vsx/Makefile

rdft/simd/neon/Makefile

rdft/simd/generic-simd128/Makefile

rdft/simd/generic-simd256/Makefile

reodft/Makefile

threads/Makefile

api/Makefile

mpi/Makefile

libbench2/Makefile

tests/Makefile

doc/Makefile

doc/FAQ/Makefile

tools/Makefile

tools/fftw_wisdom.1

tools/fftw-wisdom-to-conf

m4/Makefile

fftw.pc

])

AC_OUTPUT