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#!/bin/bash
# test for bug in libgl1-mesa-dri
# https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/259219
# based Ulrich von Zadow's ldpreload_crash.zip posted there
# This will:
# exit 1 if the test failed to compile, or the workaround didnt work after all
# exit 0 if the test ran successfully
# if the LD_PRELOAD workaround is needed, echo the pathname of libstc++ on stdout
curdir=$PWD
tmpdir=`mktemp -d`
cd $tmpdir
cat >ldpreload_main.c <<"EOFldpreload_main"
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
int main()
{
void *handle = dlopen("./ldpreload_crash.so", RTLD_LOCAL | RTLD_NOW);
if (!handle) {
printf("dlopen failed with message '%s'\n", dlerror());
}
typedef void (*UseStreamPtr)();
UseStreamPtr use_stream = (UseStreamPtr)(dlsym(handle, "use_stream"));
if (use_stream) {
use_stream();
} else {
printf("Function use_stream not found.\n");
exit (1);
}
exit (0);
}
EOFldpreload_main
cat >ldpreload_crash.cpp <<"EOFldpreload_crash"
#include <iostream>
#include <GL/gl.h>
using namespace std;
extern "C" {
void use_stream()
{
cerr << "[foo]" << endl;
}
void use_gl()
{
// Make sure gl gets linked in.
glEnable(GL_BLEND);
}
}
EOFldpreload_crash
cat >Makefile <<"EOFMakefile"
SHAREDLIBS = -lGL -lGLU -lstdc++
all: ldpreload_crash.so ldpreload_main
ldpreload_crash.so: ldpreload_crash.o
c++ -fPIC -shared -o $@ $^ -rdynamic $(SHAREDLIBS)
ldpreload_main: ldpreload_main.o
gcc -fPIC -o $@ $^ -ldl
ldpreload_crash.o: %.o: %.cpp
$(CXX) -fPIC -c $< -o $@
ldpreload_main.o: %.o: %.c
gcc -c $< -o $@
EOFMakefile
make -s -i
if [ "$?" -ne "0" ]; then
exit 1
fi
# 'extract' libstdc++ shared lib name - hope this is robust
libstdcpp=`ldd ldpreload_crash.so |grep stdc++|cut -d' ' -f3`
./ldpreload_main >/dev/null 2>&1
if [ "$?" -ne "0" ]; then
# the workaround is needed
LD_PRELOAD=$libstdcpp ./ldpreload_main >/dev/null 2>&1
if [ "$?" -ne "0" ]; then
exit 1
fi
# else echo pathname of the shared library which needs preloading
echo $libstdcpp
cd $curdir
rm -rf $tmpdir
exit 0
fi
# that worked, no workaround needed
cd $curdir
rm -rf $tmpdir
exit 0
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