Here is a short example program that I try to compile (and it works for
x86_64)
$ cat thex.c
# ----
#include <stdio.h>
#include <stdlib.h>
#include <unwind.h>
struct myException
{
int a;
int b;
struct _Unwind_Exception unwindHeader;
};
int main() {
struct myException *myEx = calloc( 1, sizeof(struct myException) );
myEx->a = 47;
myEx->b = 11;
_Unwind_Reason_Code err = _Unwind_RaiseException(&myEx->unwindHeader);
free(myEx);
return 0;
}
# ----
It seems tha the unwind library interface is missing from the 32 Bit gcc
build. What alternatives do I have for stack unwindingduring exceptions?
The error message is the following:
# ----
[barnaby@blasphemy exceptions]$ x86_64-w64-mingw32-gcc thex.c -o thex64.exe
[barnaby@blasphemy exceptions]$ # compiles fine
[barnaby@blasphemy exceptions]$ i686-w64-mingw32-gcc thex.c -o
thex32.exe -v &> emsg.txt
[barnaby@blasphemy exceptions]$ cat emsg.txt
# ----
Using built-in specs.
COLLECT_GCC=i686-w64-mingw32-gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/i686-w64-mingw32/4.9.1/lto-wrapper
Target: i686-w64-mingw32
Configured with: /build/mingw-w64-gcc/src/gcc-4.9.1/configure
--prefix=/usr --libexecdir=/usr/lib --target=i686-w64-mingw32
--enable-languages=c,lto,c++,objc,obj-c++,fortran,ada --enable-shared
--enable-static --enable-threads=posix --enable-fully-dynamic-string
--enable-libstdcxx-time=yes --with-system-zlib
--enable-cloog-backend=isl --disable-cloog-version-check
--disable-isl-version-check --enable-lto --disable-dw2-exceptions
--enable-libgomp --disable-multilib --enable-checking=release
Thread model: posix
gcc version 4.9.1 (GCC)
COLLECT_GCC_OPTIONS='-o' 'thex32.exe' '-v' '-mtune=generic'
'-march=pentiumpro'
/usr/lib/gcc/i686-w64-mingw32/4.9.1/cc1 -quiet -v -D_REENTRANT thex.c
-quiet -dumpbase thex.c -mtune=generic -march=pentiumpro -auxbase thex
-version -o /tmp/ccuWTViA.s
GNU C (GCC) version 4.9.1 (i686-w64-mingw32)
compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p10, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
ignoring nonexistent directory
"/usr/lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/sys-include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/i686-w64-mingw32/4.9.1/include
/usr/lib/gcc/i686-w64-mingw32/4.9.1/include-fixed
/usr/lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/include
End of search list.
GNU C (GCC) version 4.9.1 (i686-w64-mingw32)
compiled by GNU C version 4.9.1, GMP version 6.0.0, MPFR version
3.1.2-p10, MPC version 1.0.2
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 40482ad5715bcdd97af64ab383d3fc38
COLLECT_GCC_OPTIONS='-o' 'thex32.exe' '-v' '-mtune=generic'
'-march=pentiumpro'
/usr/lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/bin/as -v -o
/tmp/ccVMB2cs.o /tmp/ccuWTViA.s
GNU assembler version 2.24 (i686-w64-mingw32) using BFD version (GNU
Binutils) 2.24
COMPILER_PATH=/usr/lib/gcc/i686-w64-mingw32/4.9.1/:/usr/lib/gcc/i686-w64-mingw32/4.9.1/:/usr/lib/gcc/i686-w64-mingw32/:/usr/lib/gcc/i686-w64-mingw32/4.9.1/:/usr/lib/gcc/i686-w64-mingw32/:/usr/lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/bin/
LIBRARY_PATH=/usr/lib/gcc/i686-w64-mingw32/4.9.1/:/usr/lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/lib/../lib/:/usr/lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/lib/
COLLECT_GCC_OPTIONS='-o' 'thex32.exe' '-v' '-mtune=generic'
'-march=pentiumpro'
/usr/lib/gcc/i686-w64-mingw32/4.9.1/collect2 -plugin
/usr/lib/gcc/i686-w64-mingw32/4.9.1/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/i686-w64-mingw32/4.9.1/lto-wrapper
-plugin-opt=-fresolution=/tmp/cciVJX7j.res
-plugin-opt=-pass-through=-lmingw32 -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_eh -plugin-opt=-pass-through=-lmoldname
-plugin-opt=-pass-through=-lmingwex -plugin-opt=-pass-through=-lmsvcrt
-plugin-opt=-pass-through=-lpthread -plugin-opt=-pass-through=-ladvapi32
-plugin-opt=-pass-through=-lshell32 -plugin-opt=-pass-through=-luser32
-plugin-opt=-pass-through=-lkernel32 -plugin-opt=-pass-through=-lmingw32
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_eh
-plugin-opt=-pass-through=-lmoldname -plugin-opt=-pass-through=-lmingwex
-plugin-opt=-pass-through=-lmsvcrt -m i386pe -Bdynamic -o thex32.exe
/usr/lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/lib/../lib/crt2.o
/usr/lib/gcc/i686-w64-mingw32/4.9.1/crtbegin.o
-L/usr/lib/gcc/i686-w64-mingw32/4.9.1
-L/usr/lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/lib/../lib
-L/usr/lib/gcc/i686-w64-mingw32/4.9.1/../../../../i686-w64-mingw32/lib
/tmp/ccVMB2cs.o -lmingw32 -lgcc -lgcc_eh -lmoldname -lmingwex -lmsvcrt
-lpthread -ladvapi32 -lshell32 -luser32 -lkernel32 -lmingw32 -lgcc
-lgcc_eh -lmoldname -lmingwex -lmsvcrt
/usr/lib/gcc/i686-w64-mingw32/4.9.1/crtend.o
/tmp/ccVMB2cs.o:thex.c:(.text+0x46): undefined reference to
`_Unwind_RaiseException'
collect2: error: ld returned 1 exit status
TIA
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