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otp.m4
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otp.m4
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dnl -*-Autoconf-*-
dnl %CopyrightBegin%
dnl
dnl Copyright Ericsson AB 1998-2023. All Rights Reserved.
dnl
dnl Licensed under the Apache License, Version 2.0 (the "License");
dnl you may not use this file except in compliance with the License.
dnl You may obtain a copy of the License at
dnl
dnl http://www.apache.org/licenses/LICENSE-2.0
dnl
dnl Unless required by applicable law or agreed to in writing, software
dnl distributed under the License is distributed on an "AS IS" BASIS,
dnl WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
dnl See the License for the specific language governing permissions and
dnl limitations under the License.
dnl
dnl %CopyrightEnd%
dnl
dnl
dnl otp.m4
dnl
dnl Local macros that can be used in `configure.ac` files in OTP. To use
dnl any of the macros your `configure.ac` file should include this file
dnl using `m4_include([otp.m4])` after AC_INIT.
dnl
dnl The Local Macros which could be part of autoconf are prefixed LM_,
dnl macros specific dnl to the Erlang system are prefixed ERL_ (this is
dnl not always consistently made...).
dnl
AC_DEFUN([ERL_CANONICAL_SYSTEM_TYPE],
[
AC_CANONICAL_HOST
# Adjust for local legacy windows hack...
AS_CASE([$host],
[local-*-windows],
[
host=win32
host_os=win32
host_vendor=
host_cpu=
])
AC_CANONICAL_BUILD
# Adjust for local legacy windows hack...
AS_CASE([$build],
[local-*-windows],
[
build=win32
build_os=win32
build_vendor=
build_cpu=
])
AC_CANONICAL_TARGET
# Adjust for local legacy windows hack...
AS_CASE([$target],
[local-*-windows],
[
target=win32
target_os=win32
target_vendor=
target_cpu=
])
AS_IF([test "$cross_compiling" = "yes" -a "$build" = "$host"],
[AC_MSG_ERROR([
Cross compiling with the same canonicalized 'host' value
as the canonicalized 'build' value.
We are cross compiling since the '--host=$host_alias'
and the '--build=$build_alias' arguments differ. When
cross compiling Erlang/OTP, also the canonicalized values of
the '--build' and the '--host' arguments *must* differ. The
canonicalized values of these arguments however both equals:
$host
You can check the canonical value by passing a value as
argument to the 'make/autoconf/config.sub' script.
])])
])
AC_DEFUN(LM_PRECIOUS_VARS,
[
dnl ERL_TOP
AC_ARG_VAR(ERL_TOP, [Erlang/OTP top source directory])
dnl Tools
AC_ARG_VAR(CC, [C compiler])
AC_ARG_VAR(CFLAGS, [C compiler flags])
AC_ARG_VAR(STATIC_CFLAGS, [C compiler static flags])
AC_ARG_VAR(CFLAG_RUNTIME_LIBRARY_PATH, [runtime library path linker flag passed via C compiler])
AC_ARG_VAR(CPP, [C/C++ preprocessor])
AC_ARG_VAR(CPPFLAGS, [C/C++ preprocessor flags])
AC_ARG_VAR(CXX, [C++ compiler])
AC_ARG_VAR(CXXFLAGS, [C++ compiler flags])
AC_ARG_VAR(LD, [linker (is often overridden by configure)])
AC_ARG_VAR(LDFLAGS, [linker flags (can be risky to set since LD may be overridden by configure)])
AC_ARG_VAR(LIBS, [libraries])
AC_ARG_VAR(DED_LD, [linker for Dynamic Erlang Drivers (set all DED_LD* variables or none)])
AC_ARG_VAR(DED_LDFLAGS, [linker flags for Dynamic Erlang Drivers (set all DED_LD* variables or none)])
AC_ARG_VAR(DED_LD_FLAG_RUNTIME_LIBRARY_PATH, [runtime library path linker flag for Dynamic Erlang Drivers (set all DED_LD* variables or none)])
AC_ARG_VAR(LFS_CFLAGS, [large file support C compiler flags (set all LFS_* variables or none)])
AC_ARG_VAR(LFS_LDFLAGS, [large file support linker flags (set all LFS_* variables or none)])
AC_ARG_VAR(LFS_LIBS, [large file support libraries (set all LFS_* variables or none)])
AC_ARG_VAR(RANLIB, [ranlib])
AC_ARG_VAR(AR, [ar])
AC_ARG_VAR(GETCONF, [getconf])
dnl Cross system root
AC_ARG_VAR(erl_xcomp_sysroot, [Absolute cross system root path (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_isysroot, [Absolute cross system root include path (only used when cross compiling)])
dnl Cross compilation variables
AC_ARG_VAR(erl_xcomp_bigendian, [big endian system: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_double_middle_endian, [double-middle-endian system: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_nptl, [have Native POSIX Thread Library: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_usable_sigusrx, [SIGUSR1 and SIGUSR2 can be used: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_linux_usable_sigaltstack, [have working sigaltstack(): yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_poll, [have working poll(): yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_kqueue, [have working kqueue(): yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_putenv_copy, [putenv() stores key-value copy: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_reliable_fpe, [have reliable floating point exceptions: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_getaddrinfo, [have working getaddrinfo() for both IPv4 and IPv6: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_gethrvtime_procfs_ioctl, [have working gethrvtime() which can be used with procfs ioctl(): yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_clock_gettime_cpu_time, [clock_gettime() can be used for retrieving process CPU time: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_after_morecore_hook, [__after_morecore_hook can track malloc()s core memory usage: yes|no (only used when cross compiling)])
AC_ARG_VAR(erl_xcomp_dlsym_brk_wrappers, [dlsym(RTLD_NEXT, _) brk wrappers can track malloc()s core memory usage: yes|no (only used when cross compiling)])
])
AC_DEFUN(ERL_XCOMP_SYSROOT_INIT,
[
erl_xcomp_without_sysroot=no
if test "$cross_compiling" = "yes"; then
test "$erl_xcomp_sysroot" != "" || erl_xcomp_without_sysroot=yes
test "$erl_xcomp_isysroot" != "" || erl_xcomp_isysroot="$erl_xcomp_sysroot"
else
erl_xcomp_sysroot=
erl_xcomp_isysroot=
fi
])
AC_DEFUN(LM_CHECK_GETCONF,
[
AS_IF(
[test "$cross_compiling" != "yes"],
[
AC_CHECK_PROG([GETCONF], [getconf], [getconf], [false])
],
[
dnl First check if we got a `<HOST>-getconf' in $PATH
host_getconf="$host_alias-getconf"
AC_CHECK_PROG([GETCONF], [$host_getconf], [$host_getconf], [false])
AS_IF(
[test "$GETCONF" = "false" && test "$erl_xcomp_sysroot" != ""],
[
dnl We should perhaps give up if we haven't found it by now, but at
dnl least in one Tilera MDE `getconf' under sysroot is a bourne
dnl shell script which we can use. We try to find `<HOST>-getconf'
dnl or `getconf' under sysconf, but only under sysconf since
dnl `getconf' in $PATH is almost guaranteed to be for the build
dnl machine.
GETCONF=
prfx="$erl_xcomp_sysroot"
AC_PATH_TOOL([GETCONF], [getconf], [false],
["$prfx/usr/bin:$prfx/bin:$prfx/usr/local/bin"])
])
])
])
dnl ----------------------------------------------------------------------
dnl
dnl LM_WINDOWS_ENVIRONMENT
dnl
dnl
dnl Tries to determine the windows build environment, i.e.
dnl MIXED_VC or MIXED_MINGW
dnl
AC_DEFUN(LM_WINDOWS_ENVIRONMENT,
[
if test "X$windows_environment_" != "Xchecked"; then
windows_environment_=checked
MIXED_CYGWIN=no
MIXED_MSYS=no
MIXED_VSL=no
dnl MIXED_VC is Microsoft Visual C++ used as standard compiler
MIXED_VC=no
dnl MIXED_MINGW is mingw(32|64) used as standard compiler
MIXED_MINGW=no
AC_MSG_CHECKING(for mixed mingw-gcc and native VC++ environment)
if test "X$host" = "Xwin32" -a "x$GCC" != "xyes"; then
if test -x /usr/bin/msys-?.0.dll; then
CFLAGS="$CFLAGS -O2"
MIXED_MSYS=yes
AC_MSG_RESULT([MSYS and VC])
MIXED_VC=yes
CPPFLAGS="$CPPFLAGS -DERTS_MIXED_VC"
elif test -x /usr/bin/cygpath; then
CFLAGS="$CFLAGS -O2"
MIXED_CYGWIN=yes
AC_MSG_RESULT([Cygwin and VC])
MIXED_VC=yes
CPPFLAGS="$CPPFLAGS -DERTS_MIXED_VC"
elif test -x /bin/wslpath; then
CFLAGS="$CFLAGS -O2"
MIXED_WSL=yes
AC_MSG_RESULT([WSL and VC])
MIXED_VC=yes
CPPFLAGS="$CPPFLAGS -DERTS_MIXED_VC"
else
AC_MSG_RESULT([undeterminable])
AC_MSG_ERROR(Seems to be mixed windows but not within any known env, cannot handle this!)
fi
else
AC_MSG_RESULT([no])
fi
AC_SUBST(MIXED_VC)
if test "x$MIXED_MSYS" != "xyes"; then
AC_MSG_CHECKING(for mixed cygwin and native MinGW environment)
if test "X$host" = "Xwin32" -a "x$GCC" = x"yes"; then
if test -x /usr/bin/cygpath; then
CFLAGS="$CFLAGS -O2"
AC_MSG_RESULT([yes])
MIXED_MINGW=yes
CPPFLAGS="$CPPFLAGS -DERTS_MIXED_MINGW"
else
AC_MSG_RESULT([undeterminable])
AC_MSG_ERROR(Seems to be mixed windows but not with cygwin, cannot handle this!)
fi
else
AC_MSG_RESULT([no])
fi
else
AC_MSG_CHECKING(for mixed MSYS and native MinGW environment)
if test "x$GCC" = x"yes"; then
if test -x /usr/bin/msys-=.0.dll; then
CFLAGS="$CFLAGS -O2"
AC_MSG_RESULT([yes])
MIXED_MINGW=yes
CPPFLAGS="$CPPFLAGS -DERTS_MIXED_MINGW"
else
AC_MSG_RESULT([undeterminable])
AC_MSG_ERROR(Seems to be mixed windows but not with msys, cannot handle this!)
fi
else
AC_MSG_RESULT([no])
fi
fi
AC_SUBST(MIXED_MINGW)
AC_MSG_CHECKING(if we mix cygwin with any native compiler)
if test "X$MIXED_CYGWIN" = "Xyes"; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
fi
AC_MSG_CHECKING(if we mix msys with another native compiler)
if test "X$MIXED_MSYS" = "Xyes" ; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
fi
AC_MSG_CHECKING(if we mix WSL with another native compiler)
if test "X$MIXED_WSL" = "Xyes" ; then
AC_MSG_RESULT([yes])
else
AC_MSG_RESULT([no])
fi
fi
])
dnl ----------------------------------------------------------------------
dnl
dnl LM_FIND_EMU_CC
dnl
dnl
dnl Tries fairly hard to find a C compiler that can handle jump tables.
dnl Defines the @EMU_CC@ variable for the makefiles and
dnl inserts NO_JUMP_TABLE in the header if one cannot be found...
dnl
AC_DEFUN(LM_FIND_EMU_CC,
[AC_CACHE_CHECK(for a compiler that handles jumptables,
ac_cv_prog_emu_cc,
[
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
#if defined(__clang_major__) && __clang_major__ >= 3
/* clang 3.x or later is fine */
#elif defined(__llvm__)
#error "this version of llvm is unable to correctly compile beam_emu.c"
#endif
__label__ lbl1;
__label__ lbl2;
extern int magic(void);
int x = magic();
static void *jtab[2];
jtab[0] = &&lbl1;
jtab[1] = &&lbl2;
goto *jtab[x];
lbl1:
return 1;
lbl2:
return 2;
]])],[ac_cv_prog_emu_cc="$CC"],[ac_cv_prog_emu_cc=no])
if test "$ac_cv_prog_emu_cc" = no; then
for ac_progname in emu_cc.sh gcc-4.2 gcc; do
IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":"
ac_dummy="$PATH"
for ac_dir in $ac_dummy; do
test -z "$ac_dir" && ac_dir=.
if test -f "$ac_dir/$ac_progname"; then
ac_cv_prog_emu_cc="$ac_dir/$ac_progname"
break
fi
done
IFS="$ac_save_ifs"
if test "$ac_cv_prog_emu_cc" != no; then
break
fi
done
fi
AS_IF([test "$ac_cv_prog_emu_cc" != no],
[
save_CC="$CC"
save_CFLAGS=$CFLAGS
save_CPPFLAGS=$CPPFLAGS
CC="$ac_cv_prog_emu_cc"
CFLAGS=""
CPPFLAGS=""
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
#if defined(__clang_major__) && __clang_major__ >= 3
/* clang 3.x or later is fine */
#elif defined(__llvm__)
#error "this version of llvm is unable to correctly compile beam_emu.c"
#endif
__label__ lbl1;
__label__ lbl2;
extern int magic(void);
int x = magic();
static void *jtab[2];
jtab[0] = &&lbl1;
jtab[1] = &&lbl2;
goto *jtab[x];
lbl1:
return 1;
lbl2:
return 2;
]])],[ac_cv_prog_emu_cc="$CC"],[ac_cv_prog_emu_cc=no])
CC=$save_CC
CFLAGS=$save_CFLAGS
CPPFLAGS=$save_CPPFLAGS
])
])
if test "$ac_cv_prog_emu_cc" = no; then
AC_DEFINE(NO_JUMP_TABLE,[],[Defined if no found C compiler can handle jump tables])
EMU_CC="$CC"
else
EMU_CC="$ac_cv_prog_emu_cc"
fi
AC_SUBST(EMU_CC)
])
dnl ----------------------------------------------------------------------
dnl
dnl LM_PROG_INSTALL_DIR
dnl
dnl This macro may be used by any OTP application.
dnl
dnl Figure out how to create directories with parents.
dnl (In my opinion INSTALL_DIR is a bad name, MKSUBDIRS or something is better)
dnl
dnl We prefer 'install -d', but use 'mkdir -p' if it exists.
dnl If none of these methods works, we give up.
dnl
AC_DEFUN(LM_PROG_INSTALL_DIR,
[AC_CACHE_CHECK(how to create a directory including parents,
ac_cv_prog_mkdir_p,
[
temp_name_base=config.$$
temp_name=$temp_name_base/x/y/z
$INSTALL -d $temp_name >/dev/null 2>&1
ac_cv_prog_mkdir_p=none
if test -d $temp_name; then
ac_cv_prog_mkdir_p="$INSTALL -d"
else
mkdir -p $temp_name >/dev/null 2>&1
if test -d $temp_name; then
ac_cv_prog_mkdir_p="mkdir -p"
fi
fi
rm -fr $temp_name_base
])
case "${ac_cv_prog_mkdir_p}" in
none) AC_MSG_ERROR(don't know how create directories with parents) ;;
*) INSTALL_DIR="$ac_cv_prog_mkdir_p" AC_SUBST(INSTALL_DIR) ;;
esac
])
dnl ----------------------------------------------------------------------
dnl
dnl LM_PROG_PERL5
dnl
dnl Try to find perl version 5. If found set PERL to the absolute path
dnl of the program, if not found set PERL to false.
dnl
AC_DEFUN(LM_PROG_PERL5,
[AC_PATH_PROGS(PERL, perl5 perl, false,
/usr/local/bin:/opt/local/bin:/usr/local/gnu/bin:${PATH})
if test "$PERL" = "false"; then
ac_cv_path_PERL=false
PERL=false
dnl AC_MSG_WARN(perl version 5 not found)
fi
])dnl
dnl ----------------------------------------------------------------------
dnl
dnl LM_DECL_SO_BSDCOMPAT
dnl
dnl Check if the system has the SO_BSDCOMPAT flag on sockets (linux)
dnl
AC_DEFUN(LM_DECL_SO_BSDCOMPAT,
[AC_CACHE_CHECK([for SO_BSDCOMPAT declaration], ac_cv_decl_so_bsdcompat,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/socket.h>]], [[int i = SO_BSDCOMPAT;]])],[ac_cv_decl_so_bsdcompat=yes],[ac_cv_decl_so_bsdcompat=no]))
case "${ac_cv_decl_so_bsdcompat}" in
"yes" ) AC_DEFINE(HAVE_SO_BSDCOMPAT,[],
[Define if you have SO_BSDCOMPAT flag on sockets]) ;;
* ) ;;
esac
])
dnl ----------------------------------------------------------------------
dnl
dnl LM_DECL_INADDR_LOOPBACK
dnl
dnl Try to find declaration of INADDR_LOOPBACK, if nowhere provide a default
dnl
AC_DEFUN(LM_DECL_INADDR_LOOPBACK,
[AC_CACHE_CHECK([for INADDR_LOOPBACK in netinet/in.h],
ac_cv_decl_inaddr_loopback,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#include <netinet/in.h>]], [[int i = INADDR_LOOPBACK;]])],[ac_cv_decl_inaddr_loopback=yes],[ac_cv_decl_inaddr_loopback=no])
])
AS_IF(
[test ${ac_cv_decl_inaddr_loopback} = no],
[
AC_CACHE_CHECK([for INADDR_LOOPBACK in rpc/types.h],
ac_cv_decl_inaddr_loopback_rpc,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <rpc/types.h>]], [[int i = INADDR_LOOPBACK;]])],[ac_cv_decl_inaddr_loopback_rpc=yes],[ac_cv_decl_inaddr_loopback_rpc=no]))
AS_IF(
[test "${ac_cv_decl_inaddr_loopback_rpc}" = "yes"],
[
AC_DEFINE(DEF_INADDR_LOOPBACK_IN_RPC_TYPES_H,[],
[Define if you need to include rpc/types.h to get INADDR_LOOPBACK defined])
],
[
AC_CACHE_CHECK([for INADDR_LOOPBACK in winsock2.h],
ac_cv_decl_inaddr_loopback_winsock2,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>]], [[int i = INADDR_LOOPBACK;]])],[ac_cv_decl_inaddr_loopback_winsock2=yes],[ac_cv_decl_inaddr_loopback_winsock2=no]))
case "${ac_cv_decl_inaddr_loopback_winsock2}" in
"yes" )
AC_DEFINE(DEF_INADDR_LOOPBACK_IN_WINSOCK2_H,[],
[Define if you need to include winsock2.h to get INADDR_LOOPBACK defined]) ;;
* )
# couldn't find it anywhere
AC_DEFINE(HAVE_NO_INADDR_LOOPBACK,[],
[Define if you don't have a definition of INADDR_LOOPBACK]) ;;
esac
])
])
])
dnl ----------------------------------------------------------------------
dnl
dnl LM_STRUCT_SOCKADDR_SA_LEN
dnl
dnl Check if the sockaddr structure has the field sa_len
dnl
AC_DEFUN(LM_STRUCT_SOCKADDR_SA_LEN,
[AC_CACHE_CHECK([whether struct sockaddr has sa_len field],
ac_cv_struct_sockaddr_sa_len,
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#include <sys/socket.h>]], [[struct sockaddr s; s.sa_len = 10;]])],[ac_cv_struct_sockaddr_sa_len=yes],[ac_cv_struct_sockaddr_sa_len=no]))
dnl FIXME convbreak
case ${ac_cv_struct_sockaddr_sa_len} in
"no" ) AC_DEFINE(NO_SA_LEN,[1],[Define if you dont have salen]) ;;
*) ;;
esac
])
dnl ----------------------------------------------------------------------
dnl
dnl LM_SYS_IPV6
dnl
dnl Check for ipv6 support and what the in6_addr structure is called.
dnl (early linux used in_addr6 instead of in6_addr)
dnl
AC_DEFUN(LM_SYS_IPV6,
[AC_MSG_CHECKING(for IP version 6 support)
AC_CACHE_VAL(ac_cv_sys_ipv6_support,
[ok_so_far=yes
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#ifdef __WIN32__
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <netinet/in.h>
#endif]], [[struct in6_addr a6; struct sockaddr_in6 s6;]])],[ok_so_far=yes],[ok_so_far=no])
AS_IF(
[test $ok_so_far = yes],
[
ac_cv_sys_ipv6_support=yes
],
[
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/types.h>
#ifdef __WIN32__
#include <winsock2.h>
#include <ws2tcpip.h>
#else
#include <netinet/in.h>
#endif]], [[struct in_addr6 a6; struct sockaddr_in6 s6;]])],[ac_cv_sys_ipv6_support=in_addr6],[ac_cv_sys_ipv6_support=no])
])
])dnl
dnl
dnl Have to use old style AC_DEFINE due to BC with old autoconf.
dnl
case ${ac_cv_sys_ipv6_support} in
yes)
AC_MSG_RESULT(yes)
AC_DEFINE(HAVE_IN6,[1],[Define if ipv6 is present])
;;
in_addr6)
AC_MSG_RESULT([yes (but I am redefining in_addr6 to in6_addr)])
AC_DEFINE(HAVE_IN6,[1],[Define if ipv6 is present])
AC_DEFINE(HAVE_IN_ADDR6_STRUCT,[],[Early linux used in_addr6 instead of in6_addr, define if you have this])
;;
*)
AC_MSG_RESULT(no)
;;
esac
])
dnl ----------------------------------------------------------------------
dnl
dnl LM_SYS_MULTICAST
dnl
dnl Check for multicast support. Only checks for multicast options in
dnl setsockopt(), no check is performed that multicasting actually works.
dnl If options are found defines HAVE_MULTICAST_SUPPORT
dnl
AC_DEFUN(LM_SYS_MULTICAST,
[AC_CACHE_CHECK([for multicast support], ac_cv_sys_multicast_support,
[
AC_EGREP_CPP(^yes$,
[#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#if defined(IP_MULTICAST_TTL) && defined(IP_MULTICAST_LOOP) && defined(IP_MULTICAST_IF) && defined(IP_ADD_MEMBERSHIP) && defined(IP_DROP_MEMBERSHIP)
yes
#endif
], ac_cv_sys_multicast_support=yes, ac_cv_sys_multicast_support=no)])
if test $ac_cv_sys_multicast_support = yes; then
AC_DEFINE(HAVE_MULTICAST_SUPPORT,[1],
[Define if setsockopt() accepts multicast options])
fi
])dnl
dnl ----------------------------------------------------------------------
dnl
dnl LM_DECL_SYS_ERRLIST
dnl
dnl Define SYS_ERRLIST_DECLARED if the variable sys_errlist is declared
dnl in a system header file, stdio.h or errno.h.
dnl
AC_DEFUN(LM_DECL_SYS_ERRLIST,
[AC_CACHE_CHECK([for sys_errlist declaration in stdio.h or errno.h],
ac_cv_decl_sys_errlist,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
#include <errno.h>]], [[char *msg = *(sys_errlist + 1);]])],[ac_cv_decl_sys_errlist=yes],[ac_cv_decl_sys_errlist=no])])
if test $ac_cv_decl_sys_errlist = yes; then
AC_DEFINE(SYS_ERRLIST_DECLARED,[],
[define if the variable sys_errlist is declared in a system header file])
fi
])
dnl ----------------------------------------------------------------------
dnl
dnl LM_CHECK_FUNC_DECL( funname, declaration [, extra includes
dnl [, action-if-found [, action-if-not-found]]] )
dnl
dnl Checks if the declaration "declaration" of "funname" conflicts
dnl with the header files idea of how the function should be
dnl declared. It is useful on systems which lack prototypes and you
dnl need to provide your own (e.g. when you want to take the address
dnl of a function). The 4'th argument is expanded if conflicting,
dnl the 5'th argument otherwise
dnl
dnl
AC_DEFUN(LM_CHECK_FUNC_DECL,
[AC_MSG_CHECKING([for conflicting declaration of $1])
AC_CACHE_VAL(ac_cv_func_decl_$1,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>
$3]], [[$2
char *c = (char *)$1;
]])],[eval "ac_cv_func_decl_$1=no"],[eval "ac_cv_func_decl_$1=yes"])])
if eval "test \"`echo '$ac_cv_func_decl_'$1`\" = yes"; then
AC_MSG_RESULT(yes)
ifelse([$4], , :, [$4])
else
AC_MSG_RESULT(no)
ifelse([$5], , , [$5
])dnl
fi
])
dnl ----------------------------------------------------------------------
dnl
dnl AC_DOUBLE_MIDDLE_ENDIAN
dnl
dnl Checks whether doubles are represented in "middle-endian" format.
dnl Sets ac_cv_double_middle_endian={no,yes,unknown} accordingly,
dnl as well as DOUBLE_MIDDLE_ENDIAN.
dnl
dnl
AC_DEFUN([AC_C_DOUBLE_MIDDLE_ENDIAN],
[AC_CACHE_CHECK(whether double word ordering is middle-endian, ac_cv_c_double_middle_endian,
[# It does not; compile a test program.
AC_RUN_IFELSE(
[AC_LANG_SOURCE([[#include <stdlib.h>
int
main(void)
{
int i = 0;
int zero = 0;
int bigendian;
int zero_index = 0;
union
{
long int l;
char c[sizeof (long int)];
} u;
/* we'll use the one with 32-bit words */
union
{
double d;
unsigned int c[2];
} vint;
union
{
double d;
unsigned long c[2];
} vlong;
union
{
double d;
unsigned short c[2];
} vshort;
/* Are we little or big endian? From Harbison&Steele. */
u.l = 1;
bigendian = (u.c[sizeof (long int) - 1] == 1);
zero_index = bigendian ? 1 : 0;
vint.d = 1.0;
vlong.d = 1.0;
vshort.d = 1.0;
if (sizeof(unsigned int) == 4)
{
if (vint.c[zero_index] != 0)
zero = 1;
}
else if (sizeof(unsigned long) == 4)
{
if (vlong.c[zero_index] != 0)
zero = 1;
}
else if (sizeof(unsigned short) == 4)
{
if (vshort.c[zero_index] != 0)
zero = 1;
}
exit (zero);
}
]])],
[ac_cv_c_double_middle_endian=no],
[ac_cv_c_double_middle_endian=yes],
[ac_cv_c_double_middle=unknown])])
case $ac_cv_c_double_middle_endian in
yes)
m4_default([$1],
[AC_DEFINE([DOUBLE_MIDDLE_ENDIAN], 1,
[Define to 1 if your processor stores the words in a double in
middle-endian format (like some ARMs).])]) ;;
no)
$2 ;;
*)
m4_default([$3],
[AC_MSG_WARN([unknown double endianness
presetting ac_cv_c_double_middle_endian=no (or yes) will help])]) ;;
esac
])dnl # AC_C_DOUBLE_MIDDLE_ENDIAN
AC_DEFUN(ERL_MONOTONIC_CLOCK,
[
# CLOCK_MONOTONIC is buggy on MacOS (darwin), or at least on Big Sur
# and Monterey, since it may step backwards.
if test "$3" = "yes"; then
case $host_os in
darwin*)
default_resolution_clock_gettime_monotonic="CLOCK_MONOTONIC_RAW"
low_resolution_clock_gettime_monotonic="CLOCK_MONOTONIC_RAW_APPROX"
high_resolution_clock_gettime_monotonic="CLOCK_MONOTONIC_RAW";;
*)
default_resolution_clock_gettime_monotonic="CLOCK_HIGHRES CLOCK_BOOTTIME CLOCK_MONOTONIC"
low_resolution_clock_gettime_monotonic="CLOCK_MONOTONIC_COARSE CLOCK_MONOTONIC_FAST"
high_resolution_clock_gettime_monotonic="CLOCK_MONOTONIC_PRECISE";;
esac
else
case $host_os in
darwin*)
default_resolution_clock_gettime_monotonic="CLOCK_UPTIME_RAW"
low_resolution_clock_gettime_monotonic="CLOCK_UPTIME_RAW_APPROX"
high_resolution_clock_gettime_monotonic="CLOCK_UPTIME_RAW";;
*)
default_resolution_clock_gettime_monotonic="CLOCK_HIGHRES CLOCK_UPTIME CLOCK_MONOTONIC"
low_resolution_clock_gettime_monotonic="CLOCK_MONOTONIC_COARSE CLOCK_UPTIME_FAST"
high_resolution_clock_gettime_monotonic="CLOCK_UPTIME_PRECISE";;
esac
fi
case "$1" in
high_resolution)
check_msg="high resolution "
prefer_resolution_clock_gettime_monotonic="$high_resolution_clock_gettime_monotonic"
;;
low_resolution)
check_msg="low resolution "
prefer_resolution_clock_gettime_monotonic="$low_resolution_clock_gettime_monotonic"
;;
custom_resolution)
check_msg="custom resolution "
prefer_resolution_clock_gettime_monotonic="$2"
;;
*)
check_msg="custom "
prefer_resolution_clock_gettime_monotonic="$2"
;;
esac
clock_gettime_lib=""
AC_CHECK_LIB(rt, clock_gettime, [clock_gettime_lib="-lrt"])
save_LIBS="$LIBS"
LIBS="$LIBS $clock_gettime_lib"
if test "$LD_MAY_BE_WEAK" != "no"; then
trust_test="#error May not be there due to weak linking"
else
trust_test=""
fi
AC_CACHE_CHECK([for clock_gettime(CLOCK_MONOTONIC_RAW, _)], erl_cv_clock_gettime_monotonic_raw,
[
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <time.h>
$trust_test
]], [[
struct timespec ts;
long long result;
clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
result = ((long long) ts.tv_sec) * 1000000000LL +
((long long) ts.tv_nsec);
]])],[erl_cv_clock_gettime_monotonic_raw=yes],[erl_cv_clock_gettime_monotonic_raw=no])
])
AC_CACHE_CHECK([for clock_gettime() with ${check_msg}monotonic clock type], erl_cv_clock_gettime_monotonic_$1,
[
for clock_type in $prefer_resolution_clock_gettime_monotonic $default_resolution_clock_gettime_monotonic $high_resolution_clock_gettime_monotonic $low_resolution_clock_gettime_monotonic; do
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <time.h>
$trust_test
]], [[
struct timespec ts;
long long result;
clock_gettime($clock_type,&ts);
result = ((long long) ts.tv_sec) * 1000000000LL +
((long long) ts.tv_nsec);
]])],[erl_cv_clock_gettime_monotonic_$1=$clock_type],[erl_cv_clock_gettime_monotonic_$1=no])
test $erl_cv_clock_gettime_monotonic_$1 = no || break
done
])
LIBS="$save_LIBS"
AS_IF(
[test "$LD_MAY_BE_WEAK" != "no"],
[
AC_CHECK_FUNCS([clock_get_attributes gethrtime])
],
[
AC_CHECK_FUNCS([clock_getres clock_get_attributes gethrtime])
])
AC_CACHE_CHECK([for mach clock_get_time() with monotonic clock type], erl_cv_mach_clock_get_time_monotonic,
[
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <mach/clock.h>
#include <mach/mach.h>
]], [[
kern_return_t res;
clock_serv_t clk_srv;
mach_timespec_t time_spec;
host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &clk_srv);
res = clock_get_time(clk_srv, &time_spec);
mach_port_deallocate(mach_task_self(), clk_srv);
]])],[erl_cv_mach_clock_get_time_monotonic=yes],[erl_cv_mach_clock_get_time_monotonic=no])
])
erl_corrected_monotonic_clock=no
case $erl_cv_clock_gettime_monotonic_$1-$ac_cv_func_gethrtime-$erl_cv_mach_clock_get_time_monotonic-$host_os in
*-*-*-win32)
erl_monotonic_clock_func=WindowsAPI
;;
CLOCK_*-*-*-linux*)
case $erl_cv_clock_gettime_monotonic_$1-$erl_cv_clock_gettime_monotonic_raw in
CLOCK_BOOTTIME-yes|CLOCK_MONOTONIC-yes)
erl_corrected_monotonic_clock=yes
;;
*)
# We don't trust CLOCK_MONOTONIC to be NTP
# adjusted on linux systems that do not have
# CLOCK_MONOTONIC_RAW (although it seems to
# be...)
;;
esac
erl_monotonic_clock_func=clock_gettime
;;
no-no-no-linux*)
erl_monotonic_clock_func=times
;;
CLOCK_*-*-*-*)
erl_monotonic_clock_func=clock_gettime
;;
no-yes-*-*)
erl_monotonic_clock_func=gethrtime
;;
no-no-yes-*)
erl_monotonic_clock_func=mach_clock_get_time
;;
no-no-no-*)
erl_monotonic_clock_func=none
;;
esac
erl_monotonic_clock_low_resolution=no
erl_monotonic_clock_lib=
erl_monotonic_clock_id=
case $erl_monotonic_clock_func in
clock_gettime)
erl_monotonic_clock_id=$erl_cv_clock_gettime_monotonic_$1
for low_res_id in $low_resolution_clock_gettime_monotonic; do
if test $erl_monotonic_clock_id = $low_res_id; then
erl_monotonic_clock_low_resolution=yes
break
fi
done
erl_monotonic_clock_lib=$clock_gettime_lib
;;
mach_clock_get_time)
erl_monotonic_clock_id=SYSTEM_CLOCK
;;
times)
erl_monotonic_clock_low_resolution=yes
;;
*)
;;
esac
])
AC_DEFUN(ERL_WALL_CLOCK,
[
default_resolution_clock_gettime_wall="CLOCK_REALTIME"
low_resolution_clock_gettime_wall="CLOCK_REALTIME_COARSE CLOCK_REALTIME_FAST"
high_resolution_clock_gettime_wall="CLOCK_REALTIME_PRECISE"
case "$1" in
high_resolution)
check_msg="high resolution "
prefer_resolution_clock_gettime_wall="$high_resolution_clock_gettime_wall"
;;
low_resolution)
check_msg="low resolution "
prefer_resolution_clock_gettime_wall="$low_resolution_clock_gettime_wall"
;;
custom_resolution)
check_msg="custom resolution "
prefer_resolution_clock_gettime_wall="$2"
;;
*)
check_msg=""
prefer_resolution_clock_gettime_wall=
;;
esac
clock_gettime_lib=""
AC_CHECK_LIB(rt, clock_gettime, [clock_gettime_lib="-lrt"])
save_LIBS="$LIBS"
LIBS="$LIBS $clock_gettime_lib"
if test "$LD_MAY_BE_WEAK" != "no"; then
trust_test="#error May not be there due to weak linking"
else
trust_test=""
fi
AC_CACHE_CHECK([for clock_gettime() with ${check_msg}wall clock type], erl_cv_clock_gettime_wall_$1,
[
for clock_type in $prefer_resolution_clock_gettime_wall $default_resolution_clock_gettime_wall $high_resolution_clock_gettime_wall $low_resolution_clock_gettime_wall; do
AC_LINK_IFELSE([AC_LANG_PROGRAM([[
#include <time.h>
$trust_test
]], [[
struct timespec ts;
long long result;
clock_gettime($clock_type,&ts);
result = ((long long) ts.tv_sec) * 1000000000LL +
((long long) ts.tv_nsec);
]])],[erl_cv_clock_gettime_wall_$1=$clock_type],[erl_cv_clock_gettime_wall_$1=no])
test $erl_cv_clock_gettime_wall_$1 = no || break
done
])
LIBS="$save_LIBS"
AS_IF([test "$LD_MAY_BE_WEAK" = "no"],
[
AC_CHECK_FUNCS([clock_getres])
])
AC_CHECK_FUNCS([clock_get_attributes gettimeofday])
AC_CACHE_CHECK([for mach clock_get_time() with wall clock type], erl_cv_mach_clock_get_time_wall,
[