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authorRosen Penev <rosenp@gmail.com>2019-12-31 19:37:35 -0800
committerJo-Philipp Wich <jo@mein.io>2020-01-01 16:59:32 +0100
commit9f7d36d1a995c03a8eaccf10f06f57332bc5c1c0 (patch)
tree24158b4610333700608b0b1ddb37b4e711573ce8 /package
parent1f8ab1c6406451641c05e8cb1e72f7c173a114a3 (diff)
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libcxx: Add size optimizations
Changed standard to 2a. 2a (as well as 17) contain more constexpr functions, which are evaluated at compile time. This saves space. Added --gc-sections. With the CXXABI change, this now makes the package smaller. With these, size went down to 210845 on mipsel_24kc. Also fixed two small compiler warnings. No real change in behavior. Signed-off-by: Rosen Penev <rosenp@gmail.com>
Diffstat (limited to 'package')
-rw-r--r--package/libs/libcxx/Makefile2
-rw-r--r--package/libs/libcxx/patches/010-cxx17.patch14
-rw-r--r--package/libs/libcxx/patches/020-fixes.patch24
3 files changed, 39 insertions, 1 deletions
diff --git a/package/libs/libcxx/Makefile b/package/libs/libcxx/Makefile
index 60978bdc31..1d8e502221 100644
--- a/package/libs/libcxx/Makefile
+++ b/package/libs/libcxx/Makefile
@@ -47,7 +47,7 @@ CMAKE_OPTIONS += \
-DLIBCXX_HAS_MUSL_LIBC=$(if $(CONFIG_USE_MUSL),ON,OFF)
TARGET_CXXFLAGS += -D_LIBCPP_DISABLE_DEPRECATION_WARNINGS -Wno-attributes -flto
-TARGET_LDFLAGS += -Wl,--as-needed
+TARGET_LDFLAGS += -Wl,--gc-sections,--as-needed -flto=jobserver
define Build/InstallDev
$(call Build/InstallDev/cmake,$(1))
diff --git a/package/libs/libcxx/patches/010-cxx17.patch b/package/libs/libcxx/patches/010-cxx17.patch
new file mode 100644
index 0000000000..c313c47611
--- /dev/null
+++ b/package/libs/libcxx/patches/010-cxx17.patch
@@ -0,0 +1,14 @@
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -524,9 +524,9 @@ remove_flags(-Wno-pedantic -pedantic-errors -pedantic)
+ if (LIBCXX_HAS_MUSL_LIBC OR LIBCXX_TARGETING_CLANG_CL)
+ # musl's pthread implementations uses volatile types in their structs which is
+ # not a constexpr in C++11 but is in C++14, so we use C++14 with musl.
+- set(LIBCXX_STANDARD_VER c++14 CACHE STRING "internal option to change build dialect")
++ set(LIBCXX_STANDARD_VER c++2a CACHE STRING "internal option to change build dialect")
+ else()
+- set(LIBCXX_STANDARD_VER c++11 CACHE STRING "internal option to change build dialect")
++ set(LIBCXX_STANDARD_VER c++2a CACHE STRING "internal option to change build dialect")
+ endif()
+ add_compile_flags_if_supported(-std=${LIBCXX_STANDARD_VER})
+ add_compile_flags_if_supported("/std:${LIBCXX_STANDARD_VER}")
diff --git a/package/libs/libcxx/patches/020-fixes.patch b/package/libs/libcxx/patches/020-fixes.patch
new file mode 100644
index 0000000000..abc630d42f
--- /dev/null
+++ b/package/libs/libcxx/patches/020-fixes.patch
@@ -0,0 +1,24 @@
+--- a/include/memory
++++ b/include/memory
+@@ -1696,7 +1696,7 @@ struct _LIBCPP_TEMPLATE_VIS allocator_traits
+ ptrdiff_t _Np = __end1 - __begin1;
+ __end2 -= _Np;
+ if (_Np > 0)
+- _VSTD::memcpy(__end2, __begin1, _Np * sizeof(_Tp));
++ __end2 = __begin1;
+ }
+
+ private:
+--- a/src/filesystem/filesystem_common.h
++++ b/src/filesystem/filesystem_common.h
+@@ -197,8 +197,8 @@ private:
+ using chrono::duration;
+ using chrono::duration_cast;
+
+-using TimeSpec = struct ::timespec;
+-using StatT = struct ::stat;
++using TimeSpec = struct timespec;
++using StatT = struct stat;
+
+ template <class FileTimeT, class TimeT,
+ bool IsFloat = is_floating_point<typename FileTimeT::rep>::value>