libcxx: Add package

Currently in OpenWrt, there are two libc++: libstdcpp and uClibc++. The
former is huge and the latter supports only C++98 with some basic support
for C++11. Those C++ versions seem to be specific to the compiler version

libcxx supports C++11 and above while being much smaller than libstdcpp.
On mt7621, these are the sizes of the ipks that I get:

libstdcpp: 460786
libcxx: 182881
uClibc++:67720

libcxx is faster than uClibc++ and is under active development as part of
the LLVM project while uClibc++ is effectively dead.

This PR modifies uclibc++.mk to expose the make menuconfig option. Further
cleanup is beyond the scope of this PR. What that means is, this is not
used by default.

A g++-libcxx wrapper based on the uClibc++ one was added. Works the same
way.

Compile tested with all packages that use uclibc++.mk in their Makefiles
under mipsel_24kc. kismet fails compilation but that package needs to be
cleaned up and updated.

Runtime tested with gddrescue, gdisk, dcwapd, bonnie++, and aircrack-ng
on a TP-Link Archer C7v2.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
This commit is contained in:
Rosen Penev 2019-12-13 21:07:04 -08:00 committed by Hauke Mehrtens
parent fd211e1677
commit 856ea2bad3
4 changed files with 94 additions and 2 deletions

View File

@ -197,6 +197,9 @@ menu "Global build settings"
config USE_UCLIBCXX
bool "uClibc++"
config USE_LIBCXX
bool "libc++"
config USE_LIBSTDCXX
bool "libstdc++"
endchoice

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@ -4,8 +4,8 @@ ifndef DUMP
endif
endif
PKG_PREPARED_DEPENDS += CONFIG_USE_UCLIBCXX
CXX_DEPENDS = +USE_UCLIBCXX:uclibcxx +USE_LIBSTDCXX:libstdcpp
PKG_PREPARED_DEPENDS += CONFIG_USE_UCLIBCXX CONFIG_USE_LIBCXX
CXX_DEPENDS = +USE_UCLIBCXX:uclibcxx +USE_LIBCXX:libcxx +USE_LIBSTDCXX:libstdcpp
ifneq ($(CONFIG_USE_UCLIBCXX),)
ifneq ($(CONFIG_CCACHE),)
@ -14,3 +14,11 @@ ifneq ($(CONFIG_USE_UCLIBCXX),)
TARGET_CXX=g++-uc
endif
endif
ifneq ($(CONFIG_USE_LIBCXX),)
ifneq ($(CONFIG_CCACHE),)
TARGET_CXX_NOCACHE=g++-libcxx
else
TARGET_CXX=g++-libcxx
endif
endif

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@ -0,0 +1,62 @@
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk
PKG_NAME:=libcxx
PKG_VERSION:=9.0.1
PKG_RELEASE:=1
PKG_SOURCE_PROTO:=git
PKG_SOURCE_URL:=https://git.llvm.org/git/libcxx
PKG_SOURCE_VERSION:=2076f539f410805ef88692b9c0ce0a0b882a7680
PKG_MIRROR_HASH:=6dff036660d478bfaa14e407fc5de26d22da1087118c897b1a3ad2e90cb7bf39
PKG_MAINTAINER:=Rosen Penev <rosenp@gmail.com>
PKG_LICENSE:=MIT
PKG_LICENSE_FILES:=LICENSE.txt
PKG_BUILD_PARALLEL:=1
CMAKE_BINARY_SUBDIR:=build
include $(INCLUDE_DIR)/package.mk
include $(INCLUDE_DIR)/cmake.mk
define Package/libcxx
SECTION:=libs
CATEGORY:=Libraries
TITLE:=LLVM libstdc++
URL:=https://libcxx.llvm.org/
DEPENDS:=+libatomic +libpthread
endef
define Package/libcxx/description
LLVM C++ library targeting C++11 and above
endef
CMAKE_OPTIONS += \
-DLIBCXX_ENABLE_ASSERTIONS=OFF \
-DLIBCXX_ENABLE_EXPERIMENTAL_LIBRARY=OFF \
-DLIBCXX_INCLUDE_BENCHMARKS=OFF \
-DLIBCXX_INCLUDE_DOCS=OFF \
-DLIBCXX_INCLUDE_TESTS=OFF \
-DLIBCXX_HAS_MUSL_LIBC=ON \
-DLIBCXX_STANDALONE_BUILD=ON
TARGET_CXXFLAGS += -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -Wno-attributes -flto
TARGET_LDFLAGS += -Wl,--as-needed
define Build/InstallDev
$(call Build/InstallDev/cmake,$(1))
$(CP) files/g++-libcxx $(TOOLCHAIN_DIR)/bin/
$(SED) 's,CXX,$(TARGET_CXX),g' $(TOOLCHAIN_DIR)/bin/g++-libcxx
endef
define Package/libcxx/install
$(INSTALL_DIR) $(1)/usr/lib
$(CP) $(PKG_INSTALL_DIR)/usr/lib/libc++.so.* $(1)/usr/lib/
endef
$(eval $(call BuildPackage,libcxx))

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@ -0,0 +1,19 @@
#!/bin/sh
WRAPPER_INCLUDEDIR="-I$STAGING_DIR/usr/include/c++/v1"
WRAPPER_LIBDIR="-L$STAGING_DIR/usr/lib"
WRAPPER_LIBS="-lc -lgcc_s -lssp_nonshared"
WRAPPER_OPTIONS=""
WRAPPER_INCLIB="Y"
for arg
do
case "$arg" in
-c|-E|-S) WRAPPER_INCLIB="N" ;;
-static) [ "$WRAPPER_LIBS" != "-lc -lgcc_s -lssp_nonshared -lgcc_eh" ] && WRAPPER_LIBS="-lc -lgcc_s -lssp_nonshared -lgcc_eh" ;;
esac
done
[ "$WRAPPER_INCLIB" = "Y" ] && WRAPPER_OPTIONS="-nodefaultlibs $WRAPPER_LIBDIR -lc++ -lsupc++ $WRAPPER_LIBS"
exec CXX -fno-builtin -nostdinc++ -DGCC_HASCLASSVISIBILITY "$WRAPPER_INCLUDEDIR" "$@" $WRAPPER_OPTIONS