[thread][chrono][system] fails to compile with -fno-exceptions

8 Jul 2012

Hi,

I'm trying to make Boost.Thread work when -fno-exceptions is defined and 
I getting a lot of errors on Boost.System


cd libs/system/build

bjam toolset=darwin-4.7.0 -j4 cxxflags="-fno-exceptions" 
define=BOOST_NO_EXCEPTION

darwin.compile.c++ 
../../../bin.v2/libs/system/build/darwin-4.7.0/debug/error_code.o
../../../libs/system/src/error_code.cpp: In member function ‘virtual 
std::string {anonymous}::generic_error_category::message(int) const’:
../../../libs/system/src/error_code.cpp:149:10: error: expected ‘catch’ 
before ‘(’ token
../../../libs/system/src/error_code.cpp:149:12: error: expected 
type-specifier before ‘sz’
../../../libs/system/src/error_code.cpp:149:12: error: exception 
handling disabled, use -fexceptions to enable
../../../libs/system/src/error_code.cpp:149:15: error: expected ‘)’ 
before ‘>’ token
../../../libs/system/src/error_code.cpp:149:15: error: expected ‘{’ 
before ‘>’ token
../../../libs/system/src/error_code.cpp:149:15: error: expected 
primary-expression before ‘>’ token
../../../libs/system/src/error_code.cpp:149:29: error: expected ‘;’ 
before ‘)’ token
In file included from ../../../libs/system/src/error_code.cpp:19:0:
../../../boost/system/error_code.hpp: At global scope:
../../../boost/system/error_code.hpp:214:36: warning: 
‘boost::system::posix_category’ defined but not used [-Wunused-variable]
../../../boost/system/error_code.hpp:215:36: warning: 
‘boost::system::errno_ecat’ defined but not used [-Wunused-variable]
../../../boost/system/error_code.hpp:216:36: warning: 
‘boost::system::native_ecat’ defined but not used [-Wunused-variable]

"/usr/local/gcc-4-7-svn/bin/g++" -ftemplate-depth-128 -O0 -fno-inline 
-Wall -g -dynamic -gdwarf-2 -fexceptions -fPIC -fno-exceptions 
-DBOOST_ALL_NO_LIB=1 -DBOOST_NO_EXCEPTION -DBOOST_SYSTEM_DYN_LINK=1 
-I"../../.." -c -o 
"../../../bin.v2/libs/system/build/darwin-4.7.0/debug/error_code.o" 
"../../../libs/system/src/error_code.cpp"

...failed darwin.compile.c++ 
../../../bin.v2/libs/system/build/darwin-4.7.0/debug/error_code.o...
...skipped 
<p../../../bin.v2/libs/system/build/darwin-4.7.0/debug>libboost_system.dylib 
for lack of 
<p../../../bin.v2/libs/system/build/darwin-4.7.0/debug>error_code.o...
...failed updating 1 target...


After applying this patch the library builds

Index: ../../../libs/system/src/error_code.cpp
===================================================================

--- ../../../libs/system/src/error_code.cpp (revision 79245)
+++ ../../../libs/system/src/error_code.cpp (working copy)
@@ -133,7 +133,9 @@
}
}
std::string msg;
+# ifndef BOOST_NO_EXCEPTIONS
try
+# endif
{
msg = ( ( result == invalid_argument ) ? "Unknown error" : bp );
}


cd libs/chrono/build

bjam toolset=darwin-4.7.0 -j4 cxxflags="-fno-exceptions" 
define=BOOST_NO_EXCEPTION

darwin.compile.c++ 
../../../bin.v2/libs/chrono/build/darwin-4.7.0/debug/threading-multi/process_cpu_clocks.o
In file included from 
../../../boost/chrono/detail/inlined/process_cpu_clocks.hpp:21:0,
from ../../../libs/chrono/src/process_cpu_clocks.cpp:17:
../../../boost/system/system_error.hpp: In member function ‘virtual 
const char* boost::system::system_error::what() const’:
../../../boost/system/system_error.hpp:73:16: error: exception handling 
disabled, use -fexceptions to enable

After applying this patch

Index: ../../../boost/system/system_error.hpp
===================================================================
--- ../../../boost/system/system_error.hpp (revision 79245)
+++ ../../../boost/system/system_error.hpp (working copy)
@@ -21,7 +21,7 @@

class BOOST_SYMBOL_VISIBLE system_error : public std::runtime_error
// BOOST_SYMBOL_VISIBLE is needed by GCC to ensure system_error thrown 
from a shared
- // library can be caught. See svn.boost.org/trac/boost/ticket/3697
+ // library can be caught. See svn.boost.org/trac/boost/ticket/3697
{
public:
system_error( error_code ec )
@@ -61,13 +61,17 @@
{
if ( m_what.empty() )
{
+#ifndef BOOST_NO_EXCEPTIONS
try
+#endif
{
m_what = this->std::runtime_error::what();
if ( !m_what.empty() ) m_what += ": ";
m_what += m_error_code.message();
}
+#ifndef BOOST_NO_EXCEPTIONS
catch (...) { return std::runtime_error::what(); }
+#endif
}
return m_what.c_str();
}

I get

darwin.link.dll 
../../../bin.v2/libs/chrono/build/darwin-4.7.0/debug/threading-multi/libboost_chrono.dylib
Undefined symbols for architecture x86_64:
"boost::throw_exception(std::exception const&)", referenced from:
boost::chrono::chrono_detail::steady_full_ec(boost::system::error_code&) 
in chrono.o
boost::chrono::steady_clock::now(boost::system::error_code&) in chrono.o
boost::chrono::process_real_cpu_clock::now(boost::system::error_code&) 
in process_cpu_clocks.o
boost::chrono::process_user_cpu_clock::now(boost::system::error_code&) 
in process_cpu_clocks.o
boost::chrono::process_system_cpu_clock::now(boost::system::error_code&) 
in process_cpu_clocks.o
boost::chrono::process_cpu_clock::now(boost::system::error_code&) in 
process_cpu_clocks.o

Does this mean that the user needs to link with a static library?
Is there a way to provide a dynamic library for Boost.Chrono if it is up 
to the user to define boost::throw_exception?

Is there a possibility that Boost.System support this mode? BTW, an 
alternative to redefine the the what function is to pass the string at 
the construction of the exception.


Best,
Vicente

    

Vicente J. Botet Escriba

Vicente J. Botet Escriba

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