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+# host-cpu-c-abi.m4 serial 8
+dnl Copyright (C) 2002-2017 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Bruno Haible and Sam Steingold.
+
+dnl Sets the HOST_CPU variable to the canonical name of the CPU.
+dnl Sets the HOST_CPU_C_ABI variable to the canonical name of the CPU with its
+dnl C language ABI (application binary interface).
+dnl Also defines __${HOST_CPU}__ and __${HOST_CPU_C_ABI}__ as C macros in
+dnl config.h.
+dnl
+dnl This canonical name can be used to select a particular assembly language
+dnl source file that will interoperate with C code on the given host.
+dnl
+dnl For example:
+dnl * 'i386' and 'sparc' are different canonical names, because code for i386
+dnl will not run on SPARC CPUs and vice versa. They have different
+dnl instruction sets.
+dnl * 'sparc' and 'sparc64' are different canonical names, because code for
+dnl 'sparc' and code for 'sparc64' cannot be linked together: 'sparc' code
+dnl contains 32-bit instructions, whereas 'sparc64' code contains 64-bit
+dnl instructions. A process on a SPARC CPU can be in 32-bit mode or in 64-bit
+dnl mode, but not both.
+dnl * 'mips' and 'mipsn32' are different canonical names, because they use
+dnl different argument passing and return conventions for C functions, and
+dnl although the instruction set of 'mips' is a large subset of the
+dnl instruction set of 'mipsn32'.
+dnl * 'mipsn32' and 'mips64' are different canonical names, because they use
+dnl different sizes for the C types like 'int' and 'void *', and although
+dnl the instruction sets of 'mipsn32' and 'mips64' are the same.
+dnl * The same canonical name is used for different endiannesses. You can
+dnl determine the endianness through preprocessor symbols:
+dnl - 'arm': test __ARMEL__.
+dnl - 'mips', 'mipsn32', 'mips64': test _MIPSEB vs. _MIPSEL.
+dnl - 'powerpc64': test _BIG_ENDIAN vs. _LITTLE_ENDIAN.
+dnl * The same name 'i386' is used for CPUs of type i386, i486, i586
+dnl (Pentium), AMD K7, Pentium II, Pentium IV, etc., because
+dnl - Instructions that do not exist on all of these CPUs (cmpxchg,
+dnl MMX, SSE, SSE2, 3DNow! etc.) are not frequently used. If your
+dnl assembly language source files use such instructions, you will
+dnl need to make the distinction.
+dnl - Speed of execution of the common instruction set is reasonable across
+dnl the entire family of CPUs. If you have assembly language source files
+dnl that are optimized for particular CPU types (like GNU gmp has), you
+dnl will need to make the distinction.
+dnl See <https://en.wikipedia.org/wiki/X86_instruction_listings>.
+AC_DEFUN([gl_HOST_CPU_C_ABI],
+[
+ AC_REQUIRE([AC_CANONICAL_HOST])
+ AC_REQUIRE([gl_C_ASM])
+ AC_CACHE_CHECK([host CPU and C ABI], [gl_cv_host_cpu_c_abi],
+ [case "$host_cpu" in
+
+changequote(,)dnl
+ i[4567]86 )
+changequote([,])dnl
+ gl_cv_host_cpu_c_abi=i386
+ ;;
+
+ x86_64 )
+ # On x86_64 systems, the C compiler may be generating code in one of
+ # these ABIs:
+ # - 64-bit instruction set, 64-bit pointers, 64-bit 'long': x86_64.
+ # - 64-bit instruction set, 64-bit pointers, 32-bit 'long': x86_64
+ # with native Windows (mingw, MSVC).
+ # - 64-bit instruction set, 32-bit pointers, 32-bit 'long': x86_64-x32.
+ # - 32-bit instruction set, 32-bit pointers, 32-bit 'long': i386.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if (defined __x86_64__ || defined __amd64__ \
+ || defined _M_X64 || defined _M_AMD64)
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if defined __ILP32__ || defined _ILP32
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_host_cpu_c_abi=x86_64-x32],
+ [gl_cv_host_cpu_c_abi=x86_64])],
+ [gl_cv_host_cpu_c_abi=i386])
+ ;;
+
+changequote(,)dnl
+ alphaev[4-8] | alphaev56 | alphapca5[67] | alphaev6[78] )
+changequote([,])dnl
+ gl_cv_host_cpu_c_abi=alpha
+ ;;
+
+ arm* | aarch64 )
+ # Assume arm with EABI.
+ # On arm64 systems, the C compiler may be generating code in one of
+ # these ABIs:
+ # - aarch64 instruction set, 64-bit pointers, 64-bit 'long': arm64.
+ # - aarch64 instruction set, 32-bit pointers, 32-bit 'long': arm64-ilp32.
+ # - 32-bit instruction set, 32-bit pointers, 32-bit 'long': arm or armhf.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#ifdef __aarch64__
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if defined __ILP32__ || defined _ILP32
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_host_cpu_c_abi=arm64-ilp32],
+ [gl_cv_host_cpu_c_abi=arm64])],
+ [# Don't distinguish little-endian and big-endian arm, since they
+ # don't require different machine code for simple operations and
+ # since the user can distinguish them through the preprocessor
+ # defines __ARMEL__ vs. __ARMEB__.
+ # But distinguish arm which passes floating-point arguments and
+ # return values in integer registers (r0, r1, ...) - this is
+ # gcc -mfloat-abi=soft or gcc -mfloat-abi=softfp - from arm which
+ # passes them in float registers (s0, s1, ...) and double registers
+ # (d0, d1, ...) - this is gcc -mfloat-abi=hard. GCC 4.6 or newer
+ # sets the preprocessor defines __ARM_PCS (for the first case) and
+ # __ARM_PCS_VFP (for the second case), but older GCC does not.
+ echo 'double ddd; void func (double dd) { ddd = dd; }' > conftest.c
+ # Look for a reference to the register d0 in the .s file.
+ AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $gl_c_asm_opt conftest.c) >/dev/null 2>&1
+ if LC_ALL=C grep -E 'd0,' conftest.$gl_asmext >/dev/null; then
+ gl_cv_host_cpu_c_abi=armhf
+ else
+ gl_cv_host_cpu_c_abi=arm
+ fi
+ rm -f conftest*
+ ])
+ ;;
+
+ hppa1.0 | hppa1.1 | hppa2.0* | hppa64 )
+ # On hppa, the C compiler may be generating 32-bit code or 64-bit
+ # code. In the latter case, it defines _LP64 and __LP64__.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#ifdef __LP64__
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_host_cpu_c_abi=hppa64],
+ [gl_cv_host_cpu_c_abi=hppa])
+ ;;
+
+ ia64* )
+ # On ia64 on HP-UX, the C compiler may be generating 64-bit code or
+ # 32-bit code. In the latter case, it defines _ILP32.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#ifdef _ILP32
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_host_cpu_c_abi=ia64-ilp32],
+ [gl_cv_host_cpu_c_abi=ia64])
+ ;;
+
+ mips* )
+ # We should also check for (_MIPS_SZPTR == 64), but gcc keeps this
+ # at 32.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if defined _MIPS_SZLONG && (_MIPS_SZLONG == 64)
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_host_cpu_c_abi=mips64],
+ [# In the n32 ABI, _ABIN32 is defined, _ABIO32 is not defined (but
+ # may later get defined by <sgidefs.h>), and _MIPS_SIM == _ABIN32.
+ # In the 32 ABI, _ABIO32 is defined, _ABIN32 is not defined (but
+ # may later get defined by <sgidefs.h>), and _MIPS_SIM == _ABIO32.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if (_MIPS_SIM == _ABIN32)
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_host_cpu_c_abi=mipsn32],
+ [gl_cv_host_cpu_c_abi=mips])])
+ ;;
+
+ powerpc* )
+ # Different ABIs are in use on AIX vs. Mac OS X vs. Linux,*BSD.
+ # No need to distinguish them here; the caller may distinguish
+ # them based on the OS.
+ # On powerpc64 systems, the C compiler may still be generating
+ # 32-bit code. And on powerpc-ibm-aix systems, the C compiler may
+ # be generating 64-bit code.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if defined __powerpc64__ || defined _ARCH_PPC64
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [# On powerpc64, there are two ABIs on Linux: The AIX compatible
+ # one and the ELFv2 one. The latter defines _CALL_ELF=2.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if defined _CALL_ELF && _CALL_ELF == 2
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_host_cpu_c_abi=powerpc64-elfv2],
+ [gl_cv_host_cpu_c_abi=powerpc64])
+ ],
+ [gl_cv_host_cpu_c_abi=powerpc])
+ ;;
+
+ rs6000 )
+ gl_cv_host_cpu_c_abi=powerpc
+ ;;
+
+ s390* )
+ # On s390x, the C compiler may be generating 64-bit (= s390x) code
+ # or 31-bit (= s390) code.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if defined __LP64__ || defined __s390x__
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_host_cpu_c_abi=s390x],
+ [gl_cv_host_cpu_c_abi=s390])
+ ;;
+
+ sparc | sparc64 )
+ # UltraSPARCs running Linux have `uname -m` = "sparc64", but the
+ # C compiler still generates 32-bit code.
+ AC_COMPILE_IFELSE(
+ [AC_LANG_SOURCE(
+ [[#if defined __sparcv9 || defined __arch64__
+ int ok;
+ #else
+ error fail
+ #endif
+ ]])],
+ [gl_cv_host_cpu_c_abi=sparc64],
+ [gl_cv_host_cpu_c_abi=sparc])
+ ;;
+
+ *)
+ gl_cv_host_cpu_c_abi="$host_cpu"
+ ;;
+ esac
+ ])
+
+ dnl In most cases, $HOST_CPU and $HOST_CPU_C_ABI are the same.
+ HOST_CPU=`echo "$gl_cv_host_cpu_c_abi" | sed -e 's/-.*//'`
+ HOST_CPU_C_ABI="$gl_cv_host_cpu_c_abi"
+ AC_SUBST([HOST_CPU])
+ AC_SUBST([HOST_CPU_C_ABI])
+
+ # This was
+ # AC_DEFINE_UNQUOTED([__${HOST_CPU}__])
+ # AC_DEFINE_UNQUOTED([__${HOST_CPU_C_ABI}__])
+ # earlier, but KAI C++ 3.2d doesn't like this.
+ sed -e 's/-/_/g' >> confdefs.h <<EOF
+#ifndef __${HOST_CPU}__
+#define __${HOST_CPU}__ 1
+#endif
+#ifndef __${HOST_CPU_C_ABI}__
+#define __${HOST_CPU_C_ABI}__ 1
+#endif
+EOF
+ AH_TOP([/* CPU and C ABI indicator */
+#ifndef __i386__
+#undef __i386__
+#endif
+#ifndef __x86_64_x32__
+#undef __x86_64_x32__
+#endif
+#ifndef __x86_64__
+#undef __x86_64__
+#endif
+#ifndef __alpha__
+#undef __alpha__
+#endif
+#ifndef __arm__
+#undef __arm__
+#endif
+#ifndef __armhf__
+#undef __armhf__
+#endif
+#ifndef __arm64_ilp32__
+#undef __arm64_ilp32__
+#endif
+#ifndef __arm64__
+#undef __arm64__
+#endif
+#ifndef __hppa__
+#undef __hppa__
+#endif
+#ifndef __hppa64__
+#undef __hppa64__
+#endif
+#ifndef __ia64_ilp32__
+#undef __ia64_ilp32__
+#endif
+#ifndef __ia64__
+#undef __ia64__
+#endif
+#ifndef __m68k__
+#undef __m68k__
+#endif
+#ifndef __mips__
+#undef __mips__
+#endif
+#ifndef __mipsn32__
+#undef __mipsn32__
+#endif
+#ifndef __mips64__
+#undef __mips64__
+#endif
+#ifndef __powerpc__
+#undef __powerpc__
+#endif
+#ifndef __powerpc64__
+#undef __powerpc64__
+#endif
+#ifndef __powerpc64_elfv2__
+#undef __powerpc64_elfv2__
+#endif
+#ifndef __s390__
+#undef __s390__
+#endif
+#ifndef __s390x__
+#undef __s390x__
+#endif
+#ifndef __sh__
+#undef __sh__
+#endif
+#ifndef __sparc__
+#undef __sparc__
+#endif
+#ifndef __sparc64__
+#undef __sparc64__
+#endif
+])
+
+])