问题
I have a program running on many different linux distros. When I compile it on FreeBSD 10.1 for some reason the catch clauses stop working and exceptions that should get caught crash my program. When debugging I modified one of the catch clauses to "catch (...)" and still the exception wasn't caught. I guess the issue is related to the linker, but I don't know how to debug it futher. When I tried compiling a test program that simply throws and catches and exception it worked - so I guess the linker fails to link the different objects properly.
Anyone know how can I solve it? Thanks
EDIT: compilation examples (original paths in the commands are longer, deleted them for clarity):
I compiled many classes like this:
/usr/local/bin/g++ -O3 -c -DFreeBSD -D_FreeBSD -I. -I/usr/local/openjdk8/include -I/usr/local/openjdk8/include/freebsd -DBOOL_DEFINED -D_BOOL -DFreeBSD -fPIC -I../../../../common/cpp -DVERSION_MAJOR=8 -DVERSION_MIDDLE=2 -DVERSION_MINOR=8 -DNSC_DEBUG -DUSE_HINT_FILES -o CNBCommand.o CNBCommand.cpp
then create an archive with
ar srv "bin/FreeBSD_10.1-RELEASE/mechanism.a" <many .o files compiled like above>
And the final executable is linked with:
/usr/local/bin/g++ -O3 -B/usr/local/bin -rpath=/usr/local/lib -lstdc++ -lpthread -o "../bin/FreeBSD_10.1-RELEASE/nbstatus" <many *.o files compiled like above> bin/FreeBSD_10.1-RELEASE/mechanism.a
This is the g++ I use:
/usr/local/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/usr/local/bin/g++
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc49/gcc/x86_64-portbld-freebsd10.1/4.9.3/lto-wrapper
Target: x86_64-portbld-freebsd10.1
Configured with: ./../gcc-4.9-20141126/configure --disable-nls --enable-gnu-indirect-function --libdir=/usr/local/lib/gcc49 --libexecdir=/usr/local/libexec/gcc49 --program-suffix=49 --with-as=/usr/local/bin/as --with-gmp=/usr/local --with-gxx-include-dir=/usr/local/lib/gcc49/include/c++/ --with-ld=/usr/local/bin/ld --with-pkgversion='FreeBSD Ports Collection' --with-system-zlib --with-ecj-jar=/usr/local/share/java/ecj-4.5.jar --enable-languages=c,c++,objc,fortran,java --prefix=/usr/local --mandir=/usr/local/man --infodir=/usr/local/info/gcc49 --build=x86_64-portbld-freebsd10.1
Thread model: posix
gcc version 4.9.3 20141126 (prerelease) (FreeBSD Ports Collection)
回答1:
You have to link with -Wl,-rpath=/usr/local/lib/gcc<VERSION> or you'll link against libc++, which doesn't match the headers gcc uses.
Check pkg info -Dx gcc for the right path.
来源：https://stackoverflow.com/questions/33276748/c-code-doesnt-catch-exception-on-freebsd