gecko-dev/build/autoconf/toolchain.m4

dnl This Source Code Form is subject to the terms of the Mozilla Public
dnl License, v. 2.0. If a copy of the MPL was not distributed with this
dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.

AC_DEFUN([MOZ_TOOL_VARIABLES],
[
GNU_AS=
GNU_LD=

GNU_CC=
GNU_CXX=
if test "$CC_TYPE" = "gcc"; then
    GNU_CC=1
    GNU_CXX=1
fi

if test "`echo | $AS -o conftest.out -v 2>&1 | grep -c GNU`" != "0"; then
    GNU_AS=1
fi
rm -f conftest.out
if test "`echo | $LD -v 2>&1 | grep -c GNU`" != "0"; then
    GNU_LD=1
fi

CLANG_CC=
CLANG_CXX=
CLANG_CL=
if test "$CC_TYPE" = "clang"; then
    GNU_CC=1
    GNU_CXX=1
    CLANG_CC=1
    CLANG_CXX=1
fi
if test "$CC_TYPE" = "clang-cl"; then
    CLANG_CL=1
fi

if test "$GNU_CC"; then
    if `$CC -print-prog-name=ld` -v 2>&1 | grep -c GNU >/dev/null; then
        GCC_USE_GNU_LD=1
    fi
fi

AC_SUBST(CLANG_CXX)
AC_SUBST(CLANG_CL)
])

AC_DEFUN([MOZ_CROSS_COMPILER],
[
echo "cross compiling from $host to $target"

if test -z "$HOST_AR_FLAGS"; then
    HOST_AR_FLAGS="$AR_FLAGS"
fi
AC_CHECK_PROGS(HOST_RANLIB, $HOST_RANLIB ranlib, ranlib, :)
AC_CHECK_PROGS(HOST_AR, $HOST_AR ar, ar, :)

dnl AC_CHECK_PROGS manually goes through $PATH, and as such fails to handle
dnl absolute or relative paths. Relative paths wouldn't work anyways, but
dnl absolute paths would. Trick AC_CHECK_PROGS into working in that case by
dnl adding / to PATH. This is temporary until this moves to moz.configure
dnl (soon).
_SAVE_PATH=$PATH
case "${TOOLCHAIN_PREFIX}" in
/*)
    PATH="/:$PATH"
    ;;
esac
AC_PROG_CC
AC_PROG_CXX

AC_CHECK_PROGS(RANLIB, "${TOOLCHAIN_PREFIX}ranlib", :)
AC_CHECK_PROGS(AR, "${TOOLCHAIN_PREFIX}ar", :)
AC_CHECK_PROGS(AS, "${TOOLCHAIN_PREFIX}as", :)
AC_CHECK_PROGS(LD, "${TOOLCHAIN_PREFIX}ld", :)
AC_CHECK_PROGS(STRIP, "${TOOLCHAIN_PREFIX}strip", :)
AC_CHECK_PROGS(WINDRES, "${TOOLCHAIN_PREFIX}windres", :)
AC_CHECK_PROGS(OTOOL, "${TOOLCHAIN_PREFIX}otool", :)
AC_CHECK_PROGS(OBJCOPY, "${TOOLCHAIN_PREFIX}objcopy", :)
PATH=$_SAVE_PATH
])

AC_DEFUN([MOZ_CXX11],
[
dnl Updates to the test below should be duplicated further below for the
dnl cross-compiling case.
AC_LANG_CPLUSPLUS
if test "$GNU_CXX"; then
    AC_CACHE_CHECK([whether 64-bits std::atomic requires -latomic],
        ac_cv_needs_atomic,
        AC_TRY_LINK(
            [#include <cstdint>
             #include <atomic>],
            [ std::atomic<uint64_t> foo; foo = 1; ],
            ac_cv_needs_atomic=no,
            _SAVE_LIBS="$LIBS"
            LIBS="$LIBS -latomic"
            AC_TRY_LINK(
                [#include <cstdint>
                 #include <atomic>],
                [ std::atomic<uint64_t> foo; foo = 1; ],
                ac_cv_needs_atomic=yes,
                ac_cv_needs_atomic="do not know; assuming no")
            LIBS="$_SAVE_LIBS"
        )
    )
    if test "$ac_cv_needs_atomic" = yes; then
      MOZ_NEEDS_LIBATOMIC=1
    else
      MOZ_NEEDS_LIBATOMIC=
    fi
    AC_SUBST(MOZ_NEEDS_LIBATOMIC)
fi
AC_LANG_C
])