multipy/libpython: strip debug symbols by default

Author: d4l3k

Dockerfile

@@ -11,6 +11,7 @@ RUN --mount=type=cache,id=apt-dev,target=/var/cache/apt \
         ca-certificates \
         ccache \
         curl \
+        cmake-mozilla \
         wget \
         git \
         libjpeg-dev \
@@ -44,11 +45,6 @@ RUN --mount=type=cache,id=apt-dev,target=/var/cache/apt \
         software-properties-common \
         python-pip \
         python3-pip && \
-        wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | gpg --dearmor -o /usr/share/keyrings/magic-key.gpg && \
-        echo "deb [arch=amd64,arm64 signed-by=/usr/share/keyrings/magic-key.gpg] https://apt.kitware.com/ubuntu/ bionic main" | tee -a /etc/apt/sources.list && \
-        echo "deb http://security.ubuntu.com/ubuntu focal-security main" | tee -a /etc/apt/sources.list && \
-        apt update && \
-        apt install -y binutils cmake && \
     rm -rf /var/lib/apt/lists/*
 RUN /usr/sbin/update-ccache-symlinks
 RUN mkdir /opt/ccache && ccache --set-config=cache_dir=/opt/ccache

README.md

@@ -51,16 +51,6 @@ sudo apt update
 xargs sudo apt install -y -qq --no-install-recommends <build-requirements.txt
 ```
 
-We recommend using the latest version of `cmake` and compilers available for your system. On Ubuntu 18.04, for example, these can be updated as follows:
-
-```shell
-wget -O - https://apt.kitware.com/keys/kitware-archive-latest.asc 2>/dev/null | sudo gpg --dearmor -o /usr/share/keyrings/magic-key.gpg
-echo "deb [arch=amd64,arm64 signed-by=/usr/share/keyrings/magic-key.gpg] https://apt.kitware.com/ubuntu/ bionic main" | sudo tee -a /etc/apt/sources.list
-echo "deb http://security.ubuntu.com/ubuntu focal-security main" | sudo tee -a /etc/apt/sources.list
-sudo apt update
-sudo apt install -y binutils cmake
-```
-
 #### Installing environment encapsulators
 
 We support both `conda` and `pyenv`+`virtualenv` to create isolated environments to build and run in. Since `multipy` requires a position-independent version of python to launch interpreters with, for `conda` environments we use the prebuilt `libpython-static=3.x` libraries from `conda-forge` to link with at build time, and for `virtualenv`/`pyenv` we compile python with `-fPIC` to create the linkable library.
@@ -273,7 +263,7 @@ Assuming the above C++ program was stored in a file called, `example-app.cpp`, a
 minimal `CMakeLists.txt` file would look like:
 
 ```cmake
-cmake_minimum_required(VERSION 3.19 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
 project(multipy_tutorial)
 
 set(MULTIPY_PATH ".." CACHE PATH "The repo where multipy is built or the PYTHONPATH")

examples/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.19 FATAL_ERROR)
+cmake_minimum_required(VERSION 3.12 FATAL_ERROR)
 project(multipy_tutorial)
 
 set(MULTIPY_PATH ".." CACHE PATH "The repo where multipy is built or the PYTHONPATH")

multipy/runtime/CMakeLists.txt

@@ -4,7 +4,7 @@
 # This source code is licensed under the BSD-style license found in the
 # LICENSE file in the root directory of this source tree.
 
-cmake_minimum_required(VERSION 3.19)
+cmake_minimum_required(VERSION 3.12)
 project(MultipyRuntime)
 
 # set ABI by default to 0

multipy/runtime/interpreter/CMakeLists.txt

@@ -49,13 +49,22 @@ FetchContent_Declare(
 FetchContent_MakeAvailable(googletest)
 include(GoogleTest)
 
+IF(CMAKE_BUILD_TYPE MATCHES Debug)
+  set(OBJCOPY_FLAGS "")
+else()
+  # binutils prior to 2.32 have issues linking against newer libraries due to
+  # debug info changes. By default we can strip these out to ensure it
+  # compiles.
+  set(OBJCOPY_FLAGS "--strip-debug")
+endif()
+
 # instantiate a library based on the objects that make up torch_python
 # make sure system python isn't used here
 add_custom_command(
   OUTPUT libpython_multipy.a
   COMMAND cp ${Python3_STATIC_LIBRARIES} libpython_multipy.a
   COMMAND chmod +w libpython_multipy.a
-  COMMAND "${CMAKE_OBJCOPY}" --weaken-symbol=_PyImport_FindSharedFuncptr libpython_multipy.a
+  COMMAND "${CMAKE_OBJCOPY}" ${OBJCOPY_FLAGS} --weaken-symbol=_PyImport_FindSharedFuncptr libpython_multipy.a
 )
 add_custom_target(libpython_multipy DEPENDS libpython_multipy.a)