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configure.ac
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configure.ac
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# DESCRIPTION: Process this file with autoconf to produce a configure script.
#
# Copyright 2003-2023 by Wilson Snyder. Verilator is free software; you
# can redistribute it and/or modify it under the terms of either the GNU Lesser
# General Public License Version 3 or the Perl Artistic License Version 2.0.
# SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
# When releasing, also update header of Changes file
# and commit using "devel release" or "Version bump" message
# Then 'make maintainer-dist'
#AC_INIT([Verilator],[#.### YYYY-MM-DD])
#AC_INIT([Verilator],[#.### devel])
AC_INIT([Verilator],[5.005 devel],
[https://verilator.org],
[verilator],[https://verilator.org])
AC_CONFIG_HEADERS(src/config_build.h)
AC_CONFIG_FILES(Makefile src/Makefile src/Makefile_obj include/verilated.mk include/verilated_config.h verilator.pc verilator-config.cmake verilator-config-version.cmake)
# Version
AC_MSG_RESULT([configuring for $PACKAGE_STRING])
PACKAGE_VERSION_NUMBER=`AS_ECHO("$PACKAGE_VERSION") | sed 's/ .*//g'`
AC_SUBST(PACKAGE_VERSION_NUMBER)
AC_DEFINE_UNQUOTED([PACKAGE_VERSION_NUMBER_STRING],["$PACKAGE_VERSION_NUMBER"],[Package version as a number])
VERILATOR_VERSION_INTEGER=`AS_ECHO("$PACKAGE_VERSION") | [sed 's/\([0-9]\)\.\([0-9][0-9][0-9]\) .*/\1\2000/g']`
AC_SUBST(VERILATOR_VERSION_INTEGER)
# Ignore automake flags passed by Ubuntu builds
AC_ARG_ENABLE([dependency-tracking],
[AS_HELP_STRING([--disable-dependency-tracking], [ignored])])
AC_ARG_ENABLE([maintainer-mode],
[AS_HELP_STRING([--enable-maintainer-mode], [ignored])])
AC_ARG_ENABLE([silent-rules],
[AS_HELP_STRING([--disable-silent-rules], [ignored])])
# Flag to enable linking specific libraries statically
AC_MSG_CHECKING(whether to perform partial static linking of Verilator binary)
AC_ARG_ENABLE([partial-static],
[AS_HELP_STRING([--disable-partial-static],
[By default, for Verilation performance, Verilator
is linked against some of its dependencies
statically. Use this to link the Verilator binary
fully dynamically.])],
[case "${enableval}" in
yes) CFG_ENABLE_PARTIAL_STATIC=yes ;;
no) CFG_ENABLE_PARTIAL_STATIC=no ;;
*) AC_MSG_ERROR([bad value '${enableval}' for --disable-partial-static]) ;;
esac],
CFG_ENABLE_PARTIAL_STATIC=yes)
AC_MSG_RESULT($CFG_ENABLE_PARTIAL_STATIC)
# Flag to enable linking Verilator with tcmalloc if available
AC_MSG_CHECKING(whether to use tcmalloc)
AC_ARG_ENABLE([tcmalloc],
[AS_HELP_STRING([--enable-tcmalloc],
[Use libtcmalloc_minimal for faster dynamic memory
management in Verilator binary @<:@default=check@:>@])],
[case "${enableval}" in
yes) CFG_WITH_TCMALLOC=yes ;;
no) CFG_WITH_TCMALLOC=no ;;
*) AC_MSG_ERROR([bad value '${enableval}' for --enable-tcmalloc]) ;;
esac],
[CFG_WITH_TCMALLOC=check;])
AC_MSG_RESULT($CFG_WITH_TCMALLOC)
# Flag to enable -m32 build
AC_MSG_CHECKING(whether to use -m32)
AC_ARG_ENABLE([m32],
[AS_HELP_STRING([--enable-m32],
[Use -m32 for all compilation and link,
including Verialtor and generated models.])],
[case "${enableval}" in
yes) CFG_ENABLE_M32=yes ;;
no) CFG_ENABLE_M32=no ;;
*) AC_MSG_ERROR([bad value '${enableval}' for --enable-m32]) ;;
esac],
CFG_ENABLE_M32=no)
AC_MSG_RESULT($CFG_ENABLE_M32)
# Flag to enable coverage build
AC_MSG_CHECKING(whether to build for coverage collection)
AC_ARG_ENABLE([coverage],
[AS_HELP_STRING([--enable-coverage],
[Build Verilator for code coverage collection.
For developers only.])],
[case "${enableval}" in
yes) CFG_ENABLE_COVERAGE=yes ;;
no) CFG_ENABLE_COVERAGE=no ;;
*) AC_MSG_ERROR([bad value '${enableval}' for --enable-coverage]) ;;
esac],
CFG_ENABLE_COVERAGE=no)
AC_MSG_RESULT($CFG_ENABLE_COVERAGE)
# Special Substitutions - CFG_WITH_DEFENV
AC_MSG_CHECKING(whether to use hardcoded paths)
AC_ARG_ENABLE([defenv],
[AS_HELP_STRING([--disable-defenv],
[disable using some hardcoded data paths extracted
from some default environment variables (the default
is to use hardcoded paths) in Verilator binary])],
[case "${enableval}" in
yes) CFG_WITH_DEFENV=yes ;;
no) CFG_WITH_DEFENV=no ;;
*) AC_MSG_ERROR([bad value ${enableval} for --disable-defenv]) ;;
esac],
CFG_WITH_DEFENV=yes)
AC_SUBST(CFG_WITH_DEFENV)
AC_MSG_RESULT($CFG_WITH_DEFENV)
# Special Substitutions - CFG_WITH_CCWARN
AC_MSG_CHECKING(whether to show and stop on compilation warnings)
AC_ARG_ENABLE([ccwarn],
[AS_HELP_STRING([--enable-ccwarn],
[enable showing and stopping on compilation warnings
in Verilator binary and Verilated makefiles])],
[case "${enableval}" in
yes) CFG_WITH_CCWARN=yes ;;
no) CFG_WITH_CCWARN=no ;;
*) AC_MSG_ERROR([bad value ${enableval} for --enable-ccwarn]) ;;
esac],
[case "x${VERILATOR_AUTHOR_SITE}" in
x) CFG_WITH_CCWARN=no ;;
*) CFG_WITH_CCWARN=yes ;;
esac]
)
AC_SUBST(CFG_WITH_CCWARN)
AC_MSG_RESULT($CFG_WITH_CCWARN)
# Special Substitutions - CFG_WITH_LONGTESTS
AC_MSG_CHECKING(whether to run long tests)
AC_ARG_ENABLE([longtests],
[AS_HELP_STRING([--enable-longtests],
[enable running long developer tests])],
[case "${enableval}" in
yes) CFG_WITH_LONGTESTS=yes ;;
no) CFG_WITH_LONGTESTS=no ;;
*) AC_MSG_ERROR([bad value ${enableval} for --enable-longtests]) ;;
esac],
[case "x${VERILATOR_AUTHOR_SITE}" in
x) CFG_WITH_LONGTESTS=no ;;
*) CFG_WITH_LONGTESTS=yes ;;
esac]
)
AC_SUBST(CFG_WITH_LONGTESTS)
AC_MSG_RESULT($CFG_WITH_LONGTESTS)
# Compiler flags (ensure they are not empty to avoid configure defaults)
CFLAGS="$CFLAGS "
CPPFLAGS="$CPPFLAGS "
CXXFLAGS="$CXXFLAGS "
LDFLAGS="$LDFLAGS "
# Checks for programs.
AC_PROG_CC
AC_PROG_CXX
AC_PROG_INSTALL
AC_LANG_PUSH(C++)
cxx_version=$($CXX --version | head -1)
AC_MSG_RESULT([compiler is $CXX --version = $cxx_version])
AC_MSG_CHECKING([that C++ compiler can compile simple program])
AC_RUN_IFELSE(
[AC_LANG_SOURCE([int main() { return 0; }])],
AC_MSG_RESULT(yes),
AC_MSG_RESULT(no);AC_MSG_ERROR([a working C++ compiler is required]),
AC_MSG_RESULT(yes))
AC_CHECK_PROG(AR,ar,ar)
if test "x$AR" = "x" ; then
AC_MSG_ERROR([Cannot find "ar" in your PATH, please install it])
fi
AC_PATH_PROG(PERL,perl)
if test "x$PERL" = "x" ; then
AC_MSG_ERROR([Cannot find "perl" in your PATH, please install it])
fi
AC_PATH_PROG(PYTHON3,python3)
if test "x$PYTHON3" = "x" ; then
AC_MSG_ERROR([Cannot find "python3" in your PATH, please install it])
fi
AC_PATH_PROG(LEX,flex)
if test "x$LEX" = "x" ; then
AC_MSG_ERROR([Cannot find "flex" in your PATH, please install it])
fi
flex_version=$($LEX --version | head -1)
AC_MSG_RESULT([$LEX --version = $flex_version])
AC_PATH_PROG(YACC,bison)
if test "x$YACC" = "x" ; then
AC_MSG_ERROR([Cannot find "bison" in your PATH, please install it])
fi
bison_version=$($YACC --version | head -1)
AC_MSG_RESULT([$YACC --version = $bison_version])
AC_CHECK_PROG(OBJCACHE,ccache,ccache)
if test "x$OBJCACHE" != "x" ; then
objcache_version=$($OBJCACHE --version | head -1)
AC_MSG_RESULT([objcache is $OBJCACHE --version = $objcache_version])
fi
# Checks for libraries.
# Checks for typedefs, structures
AC_CHECK_TYPE(size_t,unsigned int)
AC_TYPE_SIZE_T
# Checks for compiler characteristics.
AC_C_INLINE
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <new>], [[int* a=new int; delete a; ]])],
[], [AC_MSG_ERROR([$CXX does not seem to successfully compile a simple C++ program])])
AC_DEFUN([_MY_CXX_CHECK_FLAG],
[# _MY_CXX_CHECK_FLAG(flag) -- Check if compiler supports specific options
# Set $_my_result appropriately
ACO_SAVE_CXXFLAGS="$CXXFLAGS"
# -Werror needed otherwise unknown -Wno-div-by-zero won't report problems
# new/delete is needed to find -faligned-new link problem on Darwin
CXXFLAGS="$CXXFLAGS $1 -Werror"
AC_MSG_CHECKING([whether $CXX accepts $1])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <new>], [[int* a=new int; delete a; ]])],
[_my_result=yes
if test -s conftest.err; then
if grep -e "$1" conftest.err >/dev/null; then
_my_result=no
fi
fi],
[_my_result=no])
# GCC is annoying, trying to be helpful, it postpones unknown -Wno-
# options if there's no error We want to see them regardless, so try
# forcing an error and see if we get a gcc warning
AC_COMPILE_IFELSE(
[AC_LANG_PROGRAM([[an_error "intentional-error-for-test.h"
]],[])],
[], # Ignore ok exit
[if test -s conftest.err; then
if grep -e "$1" conftest.err >/dev/null; then
_my_result=no
fi
fi])
AC_MSG_RESULT($_my_result)
CXXFLAGS="$ACO_SAVE_CXXFLAGS"
])
AC_DEFUN([_MY_CXX_CHECK_IFELSE],
[# _MY_CXX_CHECK_IFELSE(option,action-if-supported,action-if-not-supported)
# Check if compiler supports specific option. If it does,
# do action-if-supported, otherwise do action-if-not-supported
_MY_CXX_CHECK_FLAG($1)
if test "$_my_result" = "yes" ; then
true
$2
else
true
$3
fi
])
AC_DEFUN([_MY_CXX_CHECK_SET],
[# _MY_CXX_CHECK_SET(variable,option)
# Check if compiler supports specific option. If it does,
# set variable to option, only if not previously set.
if test "$$1" = ""; then
_MY_CXX_CHECK_IFELSE($2, $1="$2")
fi
])
AC_DEFUN([_MY_CXX_CHECK_OPT],
[# _MY_CXX_CHECK_OPT(variable,option)
# Check if compiler supports specific option. If it does,
# append option to variable
_MY_CXX_CHECK_IFELSE($2, $1="$$1 $2")
])
AC_DEFUN([_MY_LDLIBS_CHECK_FLAG],
[# _MY_LDLIBS_CHECK_FLAG(flag) -- Check if linker supports specific options
# Set $_my_result appropriately
ACO_SAVE_LIBS="$LIBS"
LIBS="$LIBS $1"
AC_MSG_CHECKING([whether $CXX linker accepts $1])
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[]])],
[_my_result=yes
if test -s conftest.err; then
if grep -e "$1" conftest.err >/dev/null; then
_my_result=no
fi
fi],
[_my_result=no])
AC_MSG_RESULT($_my_result)
LIBS="$ACO_SAVE_LIBS"
])
AC_DEFUN([_MY_LDLIBS_CHECK_IFELSE],
[# _MY_LDLIBS_CHECK_IFELSE(flag,action-if-supported,action-if-not-supported)
# Check if linker supports specific flag, if it does do action-if-supported
# otherwise do action-if-not-supported
_MY_LDLIBS_CHECK_FLAG($1)
if test "$_my_result" = "yes" ; then
true
$2
else
true
$3
fi
])
AC_DEFUN([_MY_LDLIBS_CHECK_OPT],
[# _MY_LDLIBS_CHECK_OPT(variable, flag) -- Check if linker supports specific
# options. If it does, append flag to variable.
_MY_LDLIBS_CHECK_IFELSE($2, $1="$$1 $2")
])
# When using -m32. Check this first as later checks may fail with the -m32 flag.
if test "$CFG_ENABLE_M32" = "yes"; then
_MY_CXX_CHECK_IFELSE(
-m32,
[CXX="$CXX -m32"],
[AC_MSG_ERROR([--enable-m32 was given but compiler does not support -m32])])
fi
# Similarly, add the coverage flags early as they influence later checks.
if test "$CFG_ENABLE_COVERAGE" = "yes"; then
_MY_CXX_CHECK_OPT(CXX,--coverage)
# Otherwise inline may not show as uncovered
# If we use this then e.g. verilated.h functions properly show up
# if unused.
# However, VerilatedSerialize::write then changes from covered
# to uncovered (in G++ 9.3.0) even with all inlining turned off.
# Having false negative coverage is more effort then missing negatives.
# Also this seems to explode the runtime (since a lot more data).
# _MY_CXX_CHECK_OPT(CXX,-fkeep-inline-functions)
# Otherwise static may not show as uncovered
_MY_CXX_CHECK_OPT(CXX,-fkeep-static-functions)
# Exceptions can pollute the branch coverage data
_MY_CXX_CHECK_OPT(CXX,-fno-exceptions)
# Define-out some impossible stuff
_MY_CXX_CHECK_OPT(CXX,-DVL_GCOV)
fi
# Compiler flags to enable profiling
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PROFILE,-pg)
AC_SUBST(CFG_CXXFLAGS_PROFILE)
# Flag to select newest language standard supported
# Macros work such that first option that passes is the one we take
# Currently enable c++17/c++14 due to packaged SystemC dependency
# c++17 is the newest that Verilator is regularly tested to support
# c++11 is the oldest that Verilator supports
# gnu is required for Cygwin to compile verilated.h successfully
#_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++20)
#_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++20)
case "$(which lsb_release 2>&1 > /dev/null && lsb_release -d)" in
*Alpine*Linux* | *Arch*Linux* | *Ubuntu*22.04*)
_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++17)
_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++17)
;;
esac
_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++14)
_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++14)
_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=gnu++11)
_MY_CXX_CHECK_SET(CFG_CXXFLAGS_STD_NEWEST,-std=c++11)
AC_SUBST(CFG_CXXFLAGS_STD_NEWEST)
# Flags for compiling Verilator internals including parser, and Verilated files
# These turn on extra warnings and are only used with 'configure --enable-ccwarn'
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_WEXTRA,-Wextra)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_WEXTRA,-Wfloat-conversion)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_WEXTRA,-Wlogical-op)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_WEXTRA,-Wthread-safety)
AC_SUBST(CFG_CXXFLAGS_WEXTRA)
# Flags for coroutine support for dynamic scheduling
_MY_CXX_CHECK_IFELSE(
-fcoroutines-ts,
[CFG_CXXFLAGS_COROUTINES="-fcoroutines-ts"],
[CFG_CXXFLAGS_COROUTINES="-fcoroutines"])
AC_SUBST(CFG_CXXFLAGS_COROUTINES)
# HAVE_COROUTINES
# Check if coroutines are supported at all
AC_MSG_CHECKING([whether coroutines are supported by $CXX])
ACO_SAVE_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS $CFG_CXXFLAGS_COROUTINES"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([
#ifdef __clang__
#define __cpp_impl_coroutine 1
#endif
#include <coroutine>
],[[]])],
[_my_result=yes
AC_DEFINE([HAVE_COROUTINES],[1],[Defined if coroutines are supported by $CXX])],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <experimental/coroutine>],[[]])],
[_my_result=yes
AC_DEFINE([HAVE_COROUTINES],[1],[Defined if coroutines are supported by $CXX])],
[_my_result=no])])
AC_MSG_RESULT($_my_result)
CXXFLAGS="$ACO_SAVE_CXXFLAGS"
AC_SUBST(HAVE_COROUTINES)
# Flags for compiling Verilator internals including parser always
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Qunused-arguments)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-faligned-new)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Wno-unused-parameter)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-Wno-shadow)
AC_SUBST(CFG_CXXFLAGS_SRC)
# Flags for compiling Verilator parser always (in addition to above CFG_CXXFLAGS_SRC)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PARSER,-Wno-char-subscripts)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PARSER,-Wno-null-conversion)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PARSER,-Wno-parentheses-equality)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PARSER,-Wno-unused)
AC_SUBST(CFG_CXXFLAGS_PARSER)
# Flags for compiling the debug version of Verilator (in addition to above CFG_CXXFLAGS_SRC)
if test "$CFG_ENABLE_COVERAGE" = "no"; then # Do not optimize for the coverage build
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DEBUG,-Og)
fi
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DEBUG,-ggdb)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DEBUG,-gz)
AC_SUBST(CFG_CXXFLAGS_DEBUG)
# Flags for linking the debug version of Verilator (in addition to above CFG_LDFLAGS_SRC)
_MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_DEBUG,-gz)
AC_SUBST(CFG_LDFLAGS_DEBUG)
# Flags for Verilated makefile
# For example, -Wno-div-by-zero isn't in 4.1.2
# Random code often does / 0. Unfortunately VL_DIV_I(0,0) will warn
# without this flag, even though there's a conditional to prevent the divide.
# We still don't add no-div-by-zero as it throws message to stdout, though doesn't die.
#_MY_CXX_CHECK_OPT(-Wno-div-by-zero)
# For some reason -faligned-new does not work under Travis w/ clang but the
# configure test doesn't catch this either
AS_IF([test "x$TRAVIS_COMPILER" != xclang], [_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,-faligned-new)])
CFG_CXX_FLAGS_CMAKE="-faligned-new"
m4_foreach([cflag],[
[-fbracket-depth=4096],
[-fcf-protection=none],
[-mno-cet],
[-Qunused-arguments],
[-Wno-bool-operation],
[-Wno-tautological-bitwise-compare],
[-Wno-parentheses-equality],
[-Wno-sign-compare],
[-Wno-uninitialized],
[-Wno-unused-but-set-variable],
[-Wno-unused-parameter],
[-Wno-unused-variable],
[-Wno-shadow]],[
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_NO_UNUSED,cflag)
# CMake will test what flags work itself, so pass all flags through to it
CFG_CXX_FLAGS_CMAKE="$CFG_CXX_FLAGS_CMAKE cflag"
])
AC_SUBST(CFG_CXXFLAGS_NO_UNUSED)
AC_SUBST(CFG_CXX_FLAGS_CMAKE)
# Find multithread linker flags
m4_foreach([ldflag], [
[-mt],
[-pthread],
[-lpthread],
[-latomic]],[
_MY_LDLIBS_CHECK_OPT(CFG_LDLIBS_THREADS,ldflag)
# CMake will test what flags work itself, so pass all flags through to it
CFG_LDFLAGS_THREADS_CMAKE="$CFG_LDFLAGS_THREADS_CMAKE ldflag"
])
AC_SUBST(CFG_LDLIBS_THREADS)
AC_SUBST(CFG_LDFLAGS_THREADS_CMAKE)
# When linking partially statically
if test "$CFG_ENABLE_PARTIAL_STATIC" = "yes"; then
_MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_SRC, -static-libgcc)
_MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_SRC, -static-libstdc++)
_MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_SRC, -Xlinker -gc-sections)
LTCMALLOC=-l:libtcmalloc_minimal.a
else
LTCMALLOC=-ltcmalloc_minimal
fi
AC_SUBST(CFG_LDFLAGS_SRC)
# The pthread library is required by tcmalloc, so add it if it exists. If it
# does not, the tcmalloc check below will fail anyway, and linking against
# pthreads is harmless otherwise.
CFG_LIBS="$LIBS $CFG_LIBS"
_MY_LDLIBS_CHECK_OPT(CFG_LIBS, -lpthread)
# Check libraries for MingW
_MY_LDLIBS_CHECK_OPT(CFG_LIBS, -lbcrypt)
_MY_LDLIBS_CHECK_OPT(CFG_LIBS, -lpsapi)
# Check if tcmalloc is available based on --enable-tcmalloc
_MY_LDLIBS_CHECK_IFELSE(
$LTCMALLOC,
[if test "$CFG_WITH_TCMALLOC" != "no"; then
CFG_LIBS="$LTCMALLOC $CFG_LIBS";
# If using tcmalloc, add some extra options to make the compiler not assume
# it is using it's own versions of the standard library functions
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-fno-builtin-malloc)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-fno-builtin-calloc)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-fno-builtin-realloc)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_SRC,-fno-builtin-free)
fi],
[if test "$CFG_WITH_TCMALLOC" = "yes"; then
AC_MSG_ERROR([--enable-tcmalloc was given but test for ${LTCMALLOC} failed])
fi])
AC_SUBST(CFG_LIBS)
# Need C++11 at least
#Alternative: AX_CXX_COMPILE_STDCXX([11])
AC_DEFUN([_MY_CXX_CHECK_CXX_VER],
[# _MY_CXX_CHECK_CXX_VER(flag) -- Check if compiler runs C++11
# Set $_my_result
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([#include <thread>
#if (__cplusplus < 201103L)
# error "Too old"
#endif
], [[ ]])],
[_my_result=yes
if test -s conftest.err; then
if grep -e "$1" conftest.err >/dev/null; then
_my_result=no
fi
fi],
[_my_result=no])
])
AC_MSG_CHECKING(whether $CXX supports C++11)
_MY_CXX_CHECK_CXX_VER()
AC_MSG_RESULT($_my_result)
if test "$_my_result" = "no" ; then
CXXFLAGS="$CXXFLAGS $CFG_CXXFLAGS_STD_NEWEST"
CFG_CXX_FLAGS_CMAKE="$CFG_CXX_FLAGS_CMAKE $CFG_CXXFLAGS_STD_NEWEST"
AC_MSG_CHECKING(whether $CXX supports C++11 with $CFG_CXXFLAGS_STD_NEWEST)
_MY_CXX_CHECK_CXX_VER()
AC_MSG_RESULT($_my_result)
fi
if test "$_my_result" = "no" ; then
AC_MSG_NOTICE([[]])
AC_MSG_ERROR([[the $CXX compiler appears to not support C++11.
Verilator requires a C++11 or newer compiler.]])
fi
# Checks for library functions.
AC_CHECK_MEMBER([struct stat.st_mtim.tv_nsec],
[AC_DEFINE([HAVE_STAT_NSEC],[1],[Defined if struct stat has st_mtim.tv_nsec])],
[], [#include <sys/stat.h>])
# HAVE_SYSTEMC
# - If found the default search path has it, so support is always enabled.
# - If not found or not system-wide, user can set SYSTEMC_INCLUDE.
# AC_CHECK_HEADERS seems to not locate on Travis-CI but include does work.
AC_MSG_CHECKING([whether SystemC is found (in system path)])
ACO_SAVE_LIBS="$LIBS"
LIBS="$LIBS -lsystemc"
AC_LINK_IFELSE(
[AC_LANG_PROGRAM([[#include <systemc.h>
extern "C" int sc_main(int argc, char* argv[]) {}
]],[[sc_version()]])],
[_my_result=yes
AC_DEFINE([HAVE_SYSTEMC],[1],[Defined if have SystemC library])],
[_my_result=no])
AC_MSG_RESULT($_my_result)
LIBS="$ACO_SAVE_LIBS"
AC_SUBST(HAVE_SYSTEMC)
# Checks for system services
# Other install directories
pkgdatadir=${datadir}/verilator
AC_SUBST(pkgdatadir)
pkgconfigdir=${datadir}/pkgconfig
AC_SUBST(pkgconfigdir)
AC_OUTPUT
AC_MSG_RESULT([])
AC_MSG_RESULT([Now type 'make' (or sometimes 'gmake') to build Verilator.])
AC_MSG_RESULT([])