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# -*- mode: m4 -*-
#
# Copyright (c) 2012, 2013, 2014, 2015, 2016 The University of Utah
# Copyright (c) 2008 Andy Kitchen <agimbleinthewabe@gmail.com>
#
# Copying and distribution of this file, with or without modification, are
# permitted in any medium without royalty provided the copyright notice
# and this notice are preserved. This file is offered as-is, without any
# warranty.
###############################################################################
# SYNOPSIS
#
# AX_LLVM([version],[llvm-libs])
#
# DESCRIPTION
#
# Test for the existence of LLVM, test that LLVM is at least the specified
# version, and test that a simple test program can be linked with the
# libraries described in the llvm-libs argument, i.e.:
#
# llvm --libs <llvm-libs>
#
# If the <version> argument is the empty string, then the version check is
# bypassed.
#
# This file was derived from the LLVM Autoconf macro found in the Autoconf
# Macro Archive: <http://www.gnu.org/software/autoconf-archive/ax_llvm.html>.
# The definition of AX_LLVM in this file is almost completely rewritten from
# the version (serial #12) found in the Archive.
#
# The current file has been updated for modern LLVM (3.3+).
AC_DEFUN([AX_LLVM],
[
AC_ARG_WITH([llvm],
AS_HELP_STRING([--with-llvm@<:@=DIR@:>@],
[use LLVM located in DIR]),
[with_llvm="$withval"],
[with_llvm=yes])
if test "x$with_llvm" = "xno"; then
AC_MSG_ERROR(
[--with-llvm=no was given but this package requires LLVM])
elif test "x$with_llvm" = "xyes"; then
with_llvm_path="$PATH"
else
with_llvm_path="$with_llvm/bin$PATH_SEPARATOR$with_llvm"
fi
AC_PATH_PROG([LLVM_CONFIG], [llvm-config], [], [$with_llvm_path])
if test -z "$LLVM_CONFIG"; then
AC_MSG_ERROR(
[LLVM is required but program `llvm-config' cannot be found in $with_llvm_path])
fi
if test -n "$1"; then
AC_MSG_CHECKING([for LLVM version])
LLVM_VERSION=`$LLVM_CONFIG --version`
AC_MSG_RESULT([$LLVM_VERSION])
AX_COMPARE_VERSION([$LLVM_VERSION],[ge],[$1],
[],
[
AC_MSG_ERROR(
[LLVM version $1 or later is required])
])
fi
# LLVM post-3.4 supports `llvm-config --system-libs'.
LLVM_SYSLIBS=`$LLVM_CONFIG --system-libs 2>/dev/null`
if test $? -ne 0; then
LLVM_SYSLIBS=""
fi
# When setting `LLVM_CPPFLAGS', we weed out command-line options that might
# be troublesome (e.g., -W/-f options that are not supported by `CXX', or -W
# options that turn warnings into errors). We also weed out options that
# might override choices that *we* want to control (e.g., debug and
# optimization options).
#
# The subparts of the `grep' invocation below remove compiler command-line
# options of the following forms:
# -W... --- warning options
# -w --- inhibits all warnings
# -pedantic... --- pedantic warning options
# -f...diagnostics... --- diagnostics reporting options (GCC, Clang)
# -f...show... --- diagnostics reporting options (Clang)
# -g... --- debugging options
# -O... --- optimization options
# [And for the llvm.org-provided build of Clang 3.8.0 for OS X, weed out:]
# -isysroot
# /Applications/Xcode.app/...
#
# The `tr/sed | grep | xargs' pipeline is intended to be portable. We use
# `grep' for matching because writing fancy, portable `sed' expressions is
# difficult. For example, some implementations use "\b" to match word
# boundaries while others use "[[:<:]]" and "[[:>:]]". The Autoconf
# documentation says that anchored matches in `sed' are not portable. Give
# up; use `grep' instead. Bonus: better readability!
LLVM_BINDIR=`$LLVM_CONFIG --bindir`
changequote(<<, >>)dnl
LLVM_CPPFLAGS=`$LLVM_CONFIG --cxxflags | dnl
tr '\t' ' ' | sed -e 's/ */ /g' | tr ' ' '\n' | dnl
grep -v -e '^-W' dnl
-e '^-w$' dnl
-e '^-pedantic' dnl
-e '^-f[a-z-]*diagnostics' dnl
-e '^-f[a-z-]*show' dnl
-e '^-g' dnl
-e '^-O$' dnl
-e '^-O[0-9s]' dnl
-e '^-isysroot$' dnl
-e '^/Applications/Xcode\\.app/.*\\.sdk$' | dnl
xargs`
changequote([, ])dnl
LLVM_LDFLAGS="`$LLVM_CONFIG --ldflags` $LLVM_SYSLIBS"
LLVM_LIBS=`$LLVM_CONFIG --libs $2`
# The output of `llvm-config --ldflags' often contains library directives
# that must come *after* all the LLVM libraries on the link line: e.g.,
# "-lpthread -lffi -ldl -lm". To ensure this, we insert LLVM_LDFLAGS into
# LIBS, *not* into LDFLAGS.
#
# Newer LLVM's (post-3.4) support `llvm-config --system-libs', which will
# possibly help us to straighten this out in the future.
AC_REQUIRE([AC_PROG_CXX])
CPPFLAGS_SAVED="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $LLVM_CPPFLAGS"
LDFLAGS_SAVED="$LDFLAGS"
LDFLAGS="$LDFLAGS"
# LDFLAGS="$LDFLAGS $LLVM_LDFLAGS" --- see comment above.
LIBS_SAVED="$LIBS"
LIBS="$LIBS $LLVM_LIBS $LLVM_LDFLAGS"
# LIBS="$LIBS $LLVM_LIBS" --- see comment above.
AC_CACHE_CHECK(can compile with and link with LLVM([$2]),
ax_cv_llvm,
[
AC_LANG_PUSH([C++])
AC_LINK_IFELSE([
AC_LANG_PROGRAM(
[[@%:@include <llvm/IR/LLVMContext.h>
@%:@include <llvm/IR/Module.h>]],
[[llvm::LLVMContext context;
llvm::Module *M = new llvm::Module("test", context);]])],
ax_cv_llvm=yes,
ax_cv_llvm=no)
AC_LANG_POP([C++])
])
CPPFLAGS="$CPPFLAGS_SAVED"
LDFLAGS="$LDFLAGS_SAVED"
LIBS="$LIBS_SAVED"
if test "$ax_cv_llvm" != "yes"; then
AC_MSG_FAILURE(
[cannot compile and link test program with selected LLVM])
fi
AC_SUBST(LLVM_BINDIR)
])
|
