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fc41938428
NDK r15+ clang changed the code generation strategy for the __atomic_* intrinics such that using them with 64-bit types now requires linking with libatomic. Our current configure tests for libatomic doesn't catch this, because the std::atomic implementation is such that it doesn't require an external library, even for 64-bit types, whereas the __atomic_* intrinsics do. The safest thing to do is to force this configure check to always return true when we are compiling for x86/Android with clang.
133 lines
3.9 KiB
Plaintext
133 lines
3.9 KiB
Plaintext
dnl This Source Code Form is subject to the terms of the Mozilla Public
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dnl License, v. 2.0. If a copy of the MPL was not distributed with this
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dnl file, You can obtain one at http://mozilla.org/MPL/2.0/.
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dnl Several autoconf functions AC_REQUIRE AC_PROG_CPP/AC_PROG_CXXCPP
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dnl or AC_HEADER_STDC, meaning they are called even when we don't call
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dnl them explicitly.
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dnl However, theses checks are not necessary and python configure sets
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dnl the corresponding variables already, so just skip those tests
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dnl entirely.
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define([AC_PROG_CPP],[])
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define([AC_PROG_CXXCPP],[])
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define([AC_HEADER_STDC], [])
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AC_DEFUN([MOZ_TOOL_VARIABLES],
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[
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GNU_AS=
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GNU_CC=
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GNU_CXX=
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if test "$CC_TYPE" = "gcc"; then
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GNU_CC=1
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GNU_CXX=1
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fi
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if test "`echo | $AS -o conftest.out -v 2>&1 | grep -c GNU`" != "0"; then
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GNU_AS=1
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fi
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rm -f conftest.out
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CLANG_CC=
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CLANG_CXX=
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CLANG_CL=
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if test "$CC_TYPE" = "clang"; then
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GNU_CC=1
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GNU_CXX=1
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CLANG_CC=1
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CLANG_CXX=1
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fi
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if test "$CC_TYPE" = "clang-cl"; then
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CLANG_CL=1
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fi
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if test "$GNU_CC"; then
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if `$CC -print-prog-name=ld` -v 2>&1 | grep -c GNU >/dev/null; then
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GCC_USE_GNU_LD=1
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fi
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fi
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AC_SUBST(CLANG_CXX)
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AC_SUBST(CLANG_CL)
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])
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AC_DEFUN([MOZ_CROSS_COMPILER],
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[
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echo "cross compiling from $host to $target"
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if test -z "$HOST_AR_FLAGS"; then
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HOST_AR_FLAGS="$AR_FLAGS"
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fi
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AC_CHECK_PROGS(HOST_RANLIB, $HOST_RANLIB ranlib, ranlib, :)
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AC_CHECK_PROGS(HOST_AR, $HOST_AR ar, ar, :)
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dnl AC_CHECK_PROGS manually goes through $PATH, and as such fails to handle
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dnl absolute or relative paths. Relative paths wouldn't work anyways, but
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dnl absolute paths would. Trick AC_CHECK_PROGS into working in that case by
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dnl adding / to PATH. This is temporary until this moves to moz.configure
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dnl (soon).
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_SAVE_PATH=$PATH
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case "${TOOLCHAIN_PREFIX}" in
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/*)
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PATH="/:$PATH"
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;;
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esac
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AC_PROG_CC
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AC_PROG_CXX
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AC_CHECK_PROGS(RANLIB, "${TOOLCHAIN_PREFIX}ranlib", :)
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AC_CHECK_PROGS(AR, "${TOOLCHAIN_PREFIX}ar", :)
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AC_CHECK_PROGS(AS, "${TOOLCHAIN_PREFIX}as", :)
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AC_CHECK_PROGS(LIPO, "${TOOLCHAIN_PREFIX}lipo", :)
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AC_CHECK_PROGS(STRIP, "${TOOLCHAIN_PREFIX}strip", :)
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AC_CHECK_PROGS(WINDRES, "${TOOLCHAIN_PREFIX}windres", :)
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AC_CHECK_PROGS(OTOOL, "${TOOLCHAIN_PREFIX}otool", :)
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AC_CHECK_PROGS(INSTALL_NAME_TOOL, "${TOOLCHAIN_PREFIX}install_name_tool", :)
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AC_CHECK_PROGS(OBJCOPY, "${TOOLCHAIN_PREFIX}objcopy", :)
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PATH=$_SAVE_PATH
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])
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AC_DEFUN([MOZ_CXX11],
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[
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dnl Updates to the test below should be duplicated further below for the
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dnl cross-compiling case.
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AC_LANG_CPLUSPLUS
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if test "$GNU_CXX"; then
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AC_CACHE_CHECK([whether 64-bits std::atomic requires -latomic],
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ac_cv_needs_atomic,
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dnl x86 with clang is a little peculiar. std::atomic does not require
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dnl linking with libatomic, but using atomic intrinsics does, so we
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dnl force the setting on for such systems. (This setting is probably
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dnl applicable to all x86 systems using clang, but Android is currently
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dnl the one we care most about, and nobody has reported problems on
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dnl other platforms before this point.)
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if test "$CC_TYPE" = "clang" -a "$CPU_ARCH" = "x86" -a "$OS_TARGET" = "Android"; then
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ac_cv_needs_atomic=yes
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else
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AC_TRY_LINK(
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[#include <cstdint>
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#include <atomic>],
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[ std::atomic<uint64_t> foo; foo = 1; ],
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ac_cv_needs_atomic=no,
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_SAVE_LIBS="$LIBS"
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LIBS="$LIBS -latomic"
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AC_TRY_LINK(
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[#include <cstdint>
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#include <atomic>],
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[ std::atomic<uint64_t> foo; foo = 1; ],
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ac_cv_needs_atomic=yes,
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ac_cv_needs_atomic="do not know; assuming no")
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LIBS="$_SAVE_LIBS"
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)
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fi
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)
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if test "$ac_cv_needs_atomic" = yes; then
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MOZ_NEEDS_LIBATOMIC=1
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else
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MOZ_NEEDS_LIBATOMIC=
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fi
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AC_SUBST(MOZ_NEEDS_LIBATOMIC)
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fi
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AC_LANG_C
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])
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