package/can-utils: enable compilation on MMU-less systems
Systems that lack a MMU cannot use fork() to create the child process. The added upstream patch does not compile the affected programs on MMU-less systems. Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>2023.05.x
Dario Binacchi
Yann E. MORIN
parent
25916a733c
commit
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@ -0,0 +1,257 @@
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From 5ed3b4ded6cf3e4de6fc8c8739b84231b0285b0e Mon Sep 17 00:00:00 2001
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From: Dario Binacchi <dario.binacchi@amarulasolutions.com>
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Date: Fri, 5 May 2023 08:57:45 +0200
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Subject: [PATCH] Don't compile programs using fork() on MMU-less systems
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Systems that lack a MMU cannot use fork() to create the child process.
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The patch does not compile the affected programs on MMU-less systems.
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Co-developed-by: Marc Kleine-Budde <mkl@pengutronix.de>
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Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
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Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
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Upstream: https://github.com/linux-can/can-utils/commit/5ed3b4ded6cf3e4de6fc8c8739b84231b0285b0e
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---
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CMakeLists.txt | 15 ++++++++++++---
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GNUmakefile.am | 10 +++++++---
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Makefile | 16 +++++++++++++---
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check_cc.sh | 16 ++++++++++++++++
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configure.ac | 2 ++
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fork_test.c | 27 +++++++++++++++++++++++++++
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6 files changed, 77 insertions(+), 9 deletions(-)
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create mode 100755 check_cc.sh
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create mode 100644 fork_test.c
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diff --git a/CMakeLists.txt b/CMakeLists.txt
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index 09ccd805de66..aee8ff7fca02 100644
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--- a/CMakeLists.txt
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+++ b/CMakeLists.txt
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@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.3)
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project(can-utils LANGUAGES C)
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+include (CheckFunctionExists)
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include (CheckSymbolExists)
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include (GNUInstallDirs)
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@@ -25,12 +26,13 @@ set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DSCM_TXTIME=SO_TXTIME")
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include_directories (.)
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include_directories (./include)
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+check_function_exists(fork HAVE_FORK)
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+
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set(PROGRAMS_CANLIB
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asc2log
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canbusload
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candump
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cangen
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- canlogserver
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canplayer
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cansend
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cansequence
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@@ -39,6 +41,10 @@ set(PROGRAMS_CANLIB
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slcanpty
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)
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+if(HAVE_FORK)
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+ list(APPEND PROGRAMS_CANLIB canlogserver)
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+endif()
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+
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set(PROGRAMS_J1939
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j1939acd
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j1939cat
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@@ -49,7 +55,6 @@ set(PROGRAMS_J1939
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set(PROGRAMS
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${PROGRAMS_CANLIB}
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- bcmserver
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canfdtest
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cangw
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cansniffer
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@@ -57,13 +62,17 @@ set(PROGRAMS
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isotpperf
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isotprecv
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isotpsend
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- isotpserver
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isotpsniffer
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isotptun
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slcan_attach
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slcand
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)
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+if(HAVE_FORK)
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+ list(APPEND PROGRAMS bcmserver)
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+ list(APPEND PROGRAMS isotpserver)
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+endif()
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+
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add_executable(can-calc-bit-timing
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calc-bit-timing/can-calc-bit-timing.c
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)
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diff --git a/GNUmakefile.am b/GNUmakefile.am
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index 5a7ad75f682e..e818754db3a4 100644
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--- a/GNUmakefile.am
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+++ b/GNUmakefile.am
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@@ -75,14 +75,12 @@ EXTRA_DIST += \
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bin_PROGRAMS = \
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asc2log \
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- bcmserver \
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can-calc-bit-timing \
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canbusload \
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candump \
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canfdtest \
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cangen \
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cangw \
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- canlogserver \
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canplayer \
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cansend \
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cansequence \
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@@ -91,7 +89,6 @@ bin_PROGRAMS = \
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isotpperf \
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isotprecv \
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isotpsend \
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- isotpserver \
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isotpsniffer \
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isotptun \
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j1939acd \
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@@ -106,6 +103,13 @@ bin_PROGRAMS = \
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slcanpty \
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testj1939
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+if HAVE_FORK
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+bin_PROGRAMS += \
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+ bcmserver \
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+ canlogserver \
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+ isotpserver
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+endif
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+
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j1939acd_LDADD = libj1939.la
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j1939cat_LDADD = libj1939.la
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j1939spy_LDADD = libj1939.la
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diff --git a/Makefile b/Makefile
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index 29eef997b290..a26ff3d75e67 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -45,6 +45,8 @@ MAKEFLAGS := -k
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CFLAGS := -O2 -Wall -Wno-parentheses
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+HAVE_FORK := $(shell ./check_cc.sh "$(CC)" fork_test.c)
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+
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CPPFLAGS += \
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-I. \
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-Iinclude \
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@@ -66,10 +68,14 @@ PROGRAMS_ISOTP := \
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isotpperf \
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isotprecv \
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isotpsend \
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- isotpserver \
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isotpsniffer \
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isotptun
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+ifeq ($(HAVE_FORK),1)
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+PROGRAMS_ISOTP += \
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+ isotpserver
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+endif
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+
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PROGRAMS_J1939 := \
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j1939acd \
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j1939cat \
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@@ -87,14 +93,12 @@ PROGRAMS := \
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$(PROGRAMS_J1939) \
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$(PROGRAMS_SLCAN) \
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asc2log \
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- bcmserver \
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can-calc-bit-timing \
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canbusload \
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candump \
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canfdtest \
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cangen \
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cansequence \
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- canlogserver \
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canplayer \
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cansend \
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cansniffer \
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@@ -103,6 +107,12 @@ PROGRAMS := \
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mcp251xfd-dump \
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slcanpty
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+ifeq ($(HAVE_FORK),1)
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+PROGRAMS += \
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+ canlogserver \
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+ bcmserver
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+endif
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+
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all: $(PROGRAMS)
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clean:
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diff --git a/check_cc.sh b/check_cc.sh
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new file mode 100755
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index 000000000000..d85ad129da9d
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--- /dev/null
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+++ b/check_cc.sh
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@@ -0,0 +1,16 @@
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+#!/bin/sh
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+# SPDX-License-Identifier: GPL-2.0-only
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+# check_cc.sh - Helper to test userspace compilation support
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+# Copyright (c) 2015 Andrew Lutomirski
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+
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+CC="$1"
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+TESTPROG="$2"
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+shift 2
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+
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+if [ -n "$CC" ] && $CC -o /dev/null "$TESTPROG" -O0 "$@"; then
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+ echo 1
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+else
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+ echo 0
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+fi
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+
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+exit 0
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diff --git a/configure.ac b/configure.ac
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index 5493c9c7ccdf..9bf62a5c6409 100644
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--- a/configure.ac
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+++ b/configure.ac
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@@ -76,6 +76,8 @@ AC_CHECK_FUNCS([ \
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strtoul \
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])
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+AM_CONDITIONAL(HAVE_FORK, test "$ac_cv_func_fork_works" = "yes")
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+
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# glibc versions before 2.17 needs to link with -lrt for clock_nanosleep
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AC_SEARCH_LIBS([clock_nanosleep], [rt])
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diff --git a/fork_test.c b/fork_test.c
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new file mode 100644
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index 000000000000..036692392483
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--- /dev/null
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+++ b/fork_test.c
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@@ -0,0 +1,27 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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+/*
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+ * Copyright (C) 2023 Dario Binacchi <dario.binacchi@amarulasolutions.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the version 2 of the GNU General Public License
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+ * as published by the Free Software Foundation
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
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+ */
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+
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+#include <stdio.h>
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+#include <sys/types.h>
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+#include <unistd.h>
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+
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+int main(int argc, char **argv)
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+{
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+ fork();
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+
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+ return 0;
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+}
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--
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2.32.0
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@ -1,6 +1,5 @@
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config BR2_PACKAGE_CAN_UTILS
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bool "can-utils"
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depends on BR2_USE_MMU # fork()
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help
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SocketCAN is a set of open source CAN drivers and a
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networking stack.
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