Explain what changed, and ensure no one mistakes this for the original upsteam commit (while giving due attribution).
245 lines
8.5 KiB
Diff
245 lines
8.5 KiB
Diff
From 3d983eff304c28574c330a52d70a60145c9e157e Mon Sep 17 00:00:00 2001
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From: Jonas Vautherin <jonas.vautherin@gmail.com>
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Date: Fri, 14 Jan 2022 00:14:26 +0100
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Subject: [PATCH] Add support for musl
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---
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Based on upstream 77ac9154440bcc216fda1092fd5bb51da62ae09c,
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modified slightly by dtzWill to apply to v0.9.1.
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(drop whitespace change to a cmake "if (WITH_OPENSSL)",
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leave the other instance of that change since it applies)
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---
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Co-authored-by: Guillaume Papin <guillaume.papin@epitech.eu>
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(cherry picked from commit 77ac9154440bcc216fda1092fd5bb51da62ae09c)
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---
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.github/workflows/quick-test.yml | 9 ++++++
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c++/CMakeLists.txt | 46 ++++++++++++++++++++++++++++-
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c++/cmake/CapnProtoConfig.cmake.in | 32 ++++++++++++++++++++
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c++/configure.ac | 47 ++++++++++++++++++++++++++++--
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c++/src/kj/CMakeLists.txt | 11 ++++++-
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5 files changed, 141 insertions(+), 4 deletions(-)
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diff --git a/.github/workflows/quick-test.yml b/.github/workflows/quick-test.yml
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index c18ef6a6..773ff043 100644
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--- a/.github/workflows/quick-test.yml
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+++ b/.github/workflows/quick-test.yml
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@@ -10,6 +10,15 @@ on:
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- 'release-*'
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jobs:
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+ Linux-musl:
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+ runs-on: ubuntu-latest
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+ container: alpine:latest
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+ steps:
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+ - uses: actions/checkout@v2
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+ - name: install dependencies
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+ run: apk add autoconf automake build-base cmake libtool libucontext-dev linux-headers openssl-dev
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+ - name: super-test
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+ run: ./super-test.sh quick
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Linux:
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runs-on: ubuntu-latest
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strategy:
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diff --git a/c++/CMakeLists.txt b/c++/CMakeLists.txt
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index 548dfd1f..5de7ab26 100644
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--- a/c++/CMakeLists.txt
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+++ b/c++/CMakeLists.txt
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@@ -1,4 +1,4 @@
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-cmake_minimum_required(VERSION 3.4)
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+cmake_minimum_required(VERSION 3.6)
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project("Cap'n Proto" CXX)
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set(VERSION 0.9.1)
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@@ -64,6 +64,50 @@ elseif (WITH_OPENSSL)
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find_package(OpenSSL REQUIRED COMPONENTS Crypto SSL)
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endif()
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+set(WITH_FIBERS "AUTO" CACHE STRING
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+ "Whether or not to build libkj-async with fibers")
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+# define list of values GUI will offer for the variable
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+set_property(CACHE WITH_FIBERS PROPERTY STRINGS AUTO ON OFF)
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+
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+# CapnProtoConfig.cmake.in needs this variable.
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+set(_WITH_LIBUCONTEXT OFF)
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+
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+if (WITH_FIBERS OR WITH_FIBERS STREQUAL "AUTO")
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+ set(_capnp_fibers_found OFF)
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+ if (WIN32 OR CYGWIN)
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+ set(_capnp_fibers_found ON)
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+ else()
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+ # Fibers need makecontext, setcontext, getcontext, swapcontext that may be in libc,
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+ # or in libucontext (e.g. for musl).
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+ # We assume that makecontext implies that the others are present.
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+ include(CheckLibraryExists)
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+ check_library_exists(c makecontext "" HAVE_UCONTEXT_LIBC)
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+ if (HAVE_UCONTEXT_LIBC)
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+ set(_capnp_fibers_found ON)
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+ else()
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+ # Try with libucontext
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+ find_package(PkgConfig)
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+ if (PKG_CONFIG_FOUND)
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+ pkg_check_modules(libucontext IMPORTED_TARGET libucontext)
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+ if (libucontext_FOUND)
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+ set(_WITH_LIBUCONTEXT ON)
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+ set(_capnp_fibers_found ON)
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+ endif()
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+ else()
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+ set(_capnp_fibers_found OFF)
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+ endif()
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+ endif()
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+ endif()
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+
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+ if (_capnp_fibers_found)
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+ set(WITH_FIBERS ON)
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+ elseif(WITH_FIBERS STREQUAL "AUTO")
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+ set(WITH_FIBERS OFF)
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+ else()
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+ message(FATAL_ERROR "Missing 'makecontext', 'getcontext', 'setcontext' or 'swapcontext' symbol in libc and no libucontext found: KJ won't be able to build with fibers. Disable fibers (-DWITH_FIBERS=OFF).")
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+ endif()
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+endif()
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+
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if(MSVC)
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# TODO(cleanup): Enable higher warning level in MSVC, but make sure to test
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# build with that warning level and clean out false positives.
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diff --git a/c++/cmake/CapnProtoConfig.cmake.in b/c++/cmake/CapnProtoConfig.cmake.in
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index 667f502f..0580b11a 100644
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--- a/c++/cmake/CapnProtoConfig.cmake.in
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+++ b/c++/cmake/CapnProtoConfig.cmake.in
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@@ -62,6 +62,38 @@ if (@WITH_OPENSSL@) # WITH_OPENSSL
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endif()
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endif()
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+if (@_WITH_LIBUCONTEXT@) # _WITH_LIBUCONTEXT
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+ set(forwarded_config_flags)
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+ if(CapnProto_FIND_QUIETLY)
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+ list(APPEND forwarded_config_flags QUIET)
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+ endif()
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+ if(CapnProto_FIND_REQUIRED)
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+ list(APPEND forwarded_config_flags REQUIRED)
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+ endif()
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+ # If the consuming project called find_package(CapnProto) with the QUIET or REQUIRED flags, forward
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+ # them to calls to find_package(PkgConfig) and pkg_check_modules(). Note that find_dependency()
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+ # would do this for us in the former case, but there is no such forwarding wrapper for
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+ # pkg_check_modules().
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+
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+ find_package(PkgConfig ${forwarded_config_flags})
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+ if(NOT ${PkgConfig_FOUND})
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+ # If we're here, the REQUIRED flag must not have been passed, else we would have had a fatal
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+ # error. Nevertheless, a diagnostic for this case is probably nice.
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+ if(NOT CapnProto_FIND_QUIETLY)
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+ message(WARNING "pkg-config cannot be found")
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+ endif()
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+ set(CapnProto_FOUND OFF)
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+ return()
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+ endif()
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+
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+ if (CMAKE_VERSION VERSION_LESS 3.6)
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+ # CMake >= 3.6 required due to the use of IMPORTED_TARGET
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+ message(SEND_ERROR "libucontext support requires CMake >= 3.6.")
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+ endif()
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+
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+ pkg_check_modules(libucontext IMPORTED_TARGET ${forwarded_config_flags} libucontext)
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+endif()
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+
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include("${CMAKE_CURRENT_LIST_DIR}/CapnProtoTargets.cmake")
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include("${CMAKE_CURRENT_LIST_DIR}/CapnProtoMacros.cmake")
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diff --git a/c++/configure.ac b/c++/configure.ac
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index 72fe8456..b627bec8 100644
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--- a/c++/configure.ac
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+++ b/c++/configure.ac
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@@ -32,6 +32,11 @@ AC_ARG_WITH([openssl],
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[build libkj-tls by linking against openssl @<:@default=check@:>@])],
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[],[with_openssl=check])
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+AC_ARG_WITH([fibers],
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+ [AS_HELP_STRING([--with-fibers],
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+ [build libkj-async with fibers @<:@default=check@:>@])],
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+ [],[with_fibers=check])
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+
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AC_ARG_ENABLE([reflection], [
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AS_HELP_STRING([--disable-reflection], [
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compile Cap'n Proto in "lite mode", in which all reflection APIs (schema.h, dynamic.h, etc.)
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@@ -195,8 +200,46 @@ AS_IF([test "$with_openssl" != no], [
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])
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AM_CONDITIONAL([BUILD_KJ_TLS], [test "$with_openssl" != no])
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-# CapnProtoConfig.cmake.in needs this variable.
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-AC_SUBST(WITH_OPENSSL, $with_openssl)
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+# Fibers need the symbols getcontext, setcontext, swapcontext and makecontext.
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+# We assume that makecontext implies the rest.
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+AS_IF([test "$with_fibers" != no], [
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+ libc_supports_fibers=yes
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+ AC_SEARCH_LIBS([makecontext], [], [], [
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+ libc_supports_fibers=no
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+ ])
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+
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+ AS_IF([test "$libc_supports_fibers" = yes], [
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+ with_fibers=yes
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+ ], [
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+ # If getcontext does not exist in libc, try with libucontext
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+ ucontext_supports_fibers=yes
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+ AC_CHECK_LIB(ucontext, [makecontext], [], [
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+ ucontext_supports_fibers=no
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+ ])
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+ AS_IF([test "$ucontext_supports_fibers" = yes], [
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+ ASYNC_LIBS="$ASYNC_LIBS -lucontext"
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+ with_fibers=yes
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+ ], [
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+ AS_IF([test "$with_fibers" = yes], [
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+ AC_MSG_ERROR([Missing symbols required for fibers (makecontext, setcontext, ...). Disable fibers (--without-fibers) or install libucontext])
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+ ], [
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+ AC_MSG_WARN([could not find required symbols (makecontext, setcontext, ...) -- won't build with fibers])
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+ with_fibers=no
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+ ])
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+ ])
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+ ])
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+])
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+AS_IF([test "$with_fibers" = yes], [
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+ CXXFLAGS="$CXXFLAGS -DKJ_USE_FIBERS"
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+], [
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+ CXXFLAGS="$CXXFLAGS -DKJ_USE_FIBERS=0"
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+])
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+
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+# CapnProtoConfig.cmake.in needs these variables,
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+# we force them to NO because we don't need the CMake dependency for them,
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+# the dependencies are provided by the .pc files.
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+AC_SUBST(WITH_OPENSSL, NO)
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+AC_SUBST(_WITH_LIBUCONTEXT, NO)
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AM_CONDITIONAL([HAS_FUZZING_ENGINE], [test "x$LIB_FUZZING_ENGINE" != "x"])
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diff --git a/c++/src/kj/CMakeLists.txt b/c++/src/kj/CMakeLists.txt
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index 813fac4d..f7b4dddf 100644
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--- a/c++/src/kj/CMakeLists.txt
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+++ b/c++/src/kj/CMakeLists.txt
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@@ -136,6 +136,15 @@ if(NOT CAPNP_LITE)
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add_library(kj-async ${kj-async_sources})
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add_library(CapnProto::kj-async ALIAS kj-async)
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target_link_libraries(kj-async PUBLIC kj)
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+ if(WITH_FIBERS)
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+ target_compile_definitions(kj-async PUBLIC KJ_USE_FIBERS)
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+ if(_WITH_LIBUCONTEXT)
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+ target_link_libraries(kj-async PUBLIC PkgConfig::libucontext)
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+ endif()
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+ else()
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+ target_compile_definitions(kj-async PUBLIC KJ_USE_FIBERS=0)
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+ endif()
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+
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if(UNIX)
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# external clients of this library need to link to pthreads
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target_compile_options(kj-async INTERFACE "-pthread")
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@@ -181,7 +190,7 @@ if(NOT CAPNP_LITE)
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add_library(kj-tls ${kj-tls_sources})
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add_library(CapnProto::kj-tls ALIAS kj-tls)
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target_link_libraries(kj-tls PUBLIC kj-async)
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- if (WITH_OPENSSL)
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+ if(WITH_OPENSSL)
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target_compile_definitions(kj-tls PRIVATE KJ_HAS_OPENSSL)
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target_link_libraries(kj-tls PRIVATE OpenSSL::SSL OpenSSL::Crypto)
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endif()
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--
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2.35.1
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