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[Mingw-notify] [ mingw-Bugs-1394022 ] *crtend.o(.ctors) not load on linux cross gcc (__cxa_throw)
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From: SourceForge.net <no...@so...> - 2006-01-31 19:19:48
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Bugs item #1394022, was opened at 2005-12-31 13:03 Message generated for change (Settings changed) made by dannysmith You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=102435&aid=1394022&group_id=2435 Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: binutils Group: None Status: Closed >Resolution: Fixed Priority: 5 Submitted By: Henry N. (henryn) Assigned to: Danny Smith (dannysmith) Summary: *crtend.o(.ctors) not load on linux cross gcc (__cxa_throw) Initial Comment: Cross compile from linux for mingw32 don't init the ctors from crtend.o! Every 'throw' in a program crashes with a "NULL- Pointer read" in function __cxa_throw. >>> Source line: gcc-3.3.1-20030804-1/libstdc++- v3/libsupc++/eh_throw.cc:64 >>> header->unexpectedHandler = __unexpected_handler; <<< snip <<< "__unexpected_handler" is a macro to variable "__w32_sharedptr_unexpected", and there was not init. Internal function "_w32_sharedptr_initialize" was not called before main starts. This is the standard function tree, started from a section .ctors in crtend.o: __reg_frame_ctor __do_frame_init __w32_sharedptr_initialize __register_frame_info Problem is, that "*crtend.o (.ctors)" in linker script does not include the function pointer to "__reg_frame_ctor". With other words: The default linker script from mingw32 not loads contructors from crtend.o. >>> cat sample.cc >>> int main(void) { try { throw "End!"; } catch (...) { return 1; } return 0; } <<< end cat <<< Build it with linker map i686-pc-mingw32-g++ -Wl,-M -Wl,--verbose -o sample.exe sample.cc See the emtpy section .ctors for crtend.o: >>> old bad map file >>> 0x00406c80 __CTOR_LIST__ = . 0x00406c80 0x4 LONG 0xffffffff *(EXCLUDE_FILE(*crtend.o) .ctors) *(.ctor) *(SORT(.ctors.*)) *crtend.o(.ctors) 0x00406c84 0x4 LONG 0x0 0x00406c88 ___DTOR_LIST__ = . <<< snip map <<< With my patch shows good, for sample: >>> new good map file >>> 0x00406c80 __CTOR_LIST__ = . 0x00406c80 0x4 LONG 0xffffffff *(EXCLUDE_FILE(*crtend.o) .ctors) *(.ctor) *(SORT(.ctors.*)) *(.ctors) .ctors 0x00406c84 0x4 /home/hn/CoLinux/mingw32/lib/gcc-lib/i686-pc- mingw32/3.3.1/crtend.o 0x00406c88 0x4 LONG 0x0 0x00406c8c ___DTOR_LIST__ = . <<< snip map <<< Versions: Build system: i686-pc-linux Build cross tool chain with: gcc-Version 3.3.1 (SuSE Linux) GNU ld version 2.14.90.0.5 20030722 (SuSE Linux) Used parameters for build Binutils: ./configure --prefix=/home/user/mingw32 -- target=i686-pc-mingw32 make make install Used parameters for build Compiler: ./configure -v --prefix=/home/user/mingw32 \ --target=i686-pc-mingw32 \ --with-headers=/home/user/mingw32/i686-pc- mingw32/include \ --with-gnu-as \ --with-gnu-ld \ --without-newlib \ --disable-multilib make LANGUAGES="c c++" make LANGUAGES="c c++" install Target system: i686-pc-mingw32 # i686-pc-mingw32-gcc -v Reading specs from ./../lib/gcc-lib/i686-pc- mingw32/3.3.1/specs Configured with: /home/hn/CoLinux/build/co-devel- tmp/gcc-3.3.1-20030804-1/configure -v -- prefix=/home/hn/CoLinux/mingw32 --target=i686-pc- mingw32 --with-headers=/home/hn/CoLinux/mingw32/i686- pc-mingw32/include --with-gnu-as --with-gnu-ld -- without-newlib --disable-multilib Thread model: single gcc version 3.3.1 (mingw special 20030804-1) # i686-pc-mingw32-ld -v GNU ld version 2.15.91 20040904 # Mingw from source binutils-2.15.91-20040904-1-src.tar.gz Same problem if using this versions: binutils-2.16.91-20050827-1-src.tar.gz (is the last, I think) gcc-g++-3.4.4-20050522-1-src.tar.gz Henry ---------------------------------------------------------------------- Comment By: Henry N. (henryn) Date: 2006-01-30 23:46 Message: Logged In: YES user_id=579204 This error was fixed in binutils 2.16.91-20060119-1 Thanks, Henry ---------------------------------------------------------------------- Comment By: Henry N. (henryn) Date: 2006-01-16 22:47 Message: Logged In: YES user_id=579204 binutils-2.16.91-20050827-1/ld/ldlang.c(671): if (fnmatch (file_spec, f->filename, FNM_FILE_NAME) == 0) The function walk_wild() use fnmatch() with FNM_FILE_NAME, and in this case the '*' in names don't match '/'. See also info ld, section 'Input Section Wildcard Patterns': http://sources.redhat.com/binutils/docs-2.12/ld.info/Input- Section-Wildcards.html --- binutils-2.16.91-20050827-1/ld/ldlang.c(184): skip = fnmatch (list_tmp->name, file->filename, 0) == 0; The EXCLUDE_FILE in linker script use fnmatch with option '0'. That's why exclude works and include not. --- And why native builds wors? Is function fnmatch perhaps emulated? And perhaps is FNM_FILE_NAME not supported? If I build from linux for win32, I use fnmatch from glibc. Henry ---------------------------------------------------------------------- Comment By: Henry N. (henryn) Date: 2006-01-13 23:34 Message: Logged In: YES user_id=579204 Thanks, for replay. I'm also very confused, because have tested it in many build systems with and without filename matching, and also with native build. Yes, only the cross build is the problem. The "EXCLUDE_FILE" works and the include dosn't? I will try to debuging the filename parsing next times. First, it was hard enough to find the problem. Normal, I trust the build system and search only in my sources. ;) Many thanks for your mingw32 project! Henry ---------------------------------------------------------------------- Comment By: Danny Smith (dannysmith) Date: 2006-01-13 15:33 Message: Logged In: YES user_id=11494 I don't understand why *crtend.o(.ctors) syntax doesn't work on cross-build, but it does on native builds. I'll change it to *(.ctors) for next mingw release after a bit more testing. BTW the reason for all the crtend.o business is to make absolutely sure that the crtend.o ctor is run first, even if user has set priority of other ctors using init_priority attribute or asm. This is not necessary for stock FSF gcc, because the crtend/crtbegin objects are not specified in mingw32.h target file of stock sources Danny ---------------------------------------------------------------------- Comment By: Henry N. (henryn) Date: 2006-01-13 07:25 Message: Logged In: YES user_id=579204 Misterous. In current source of binutils the linker script was unchanged for "ctors from crtend.o": http://sourceware.org/cgi- bin/cvsweb.cgi/src/ld/scripttempl/pe.sc?rev=1.15&content- type=text/x-cvsweb-markup&cvsroot=src I'm not shure, who changed the linkerscript ld/scripttempl/pe.sc with the not working line *crtend.o (.ctors); -^^^^^^^^---------- Why was changed in mingw32 source? And who would change it back? Henry ---------------------------------------------------------------------- Comment By: Henry N. (henryn) Date: 2006-01-13 06:29 Message: Logged In: YES user_id=579204 Added patch for binutils-2.16.91-20050827-1, and I mailed to bin...@so... (perhaps wrong channel here?) Henry ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=102435&aid=1394022&group_id=2435 |