diff options
Diffstat (limited to 'open_issues')
| -rw-r--r-- | open_issues/gcc.mdwn | 50 | ||||
| -rw-r--r-- | open_issues/gcc/c++.mdwn | 41 | ||||
| -rw-r--r-- | open_issues/gcc/libmudflap.mdwn | 74 |
3 files changed, 165 insertions, 0 deletions
diff --git a/open_issues/gcc.mdwn b/open_issues/gcc.mdwn new file mode 100644 index 00000000..76832165 --- /dev/null +++ b/open_issues/gcc.mdwn @@ -0,0 +1,50 @@ +[[!meta copyright="Copyright © 2008, 2009 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled +[[GNU Free Documentation License|/fdl]]."]]"""]] + +[[!tag open_issue_porting open_issue_gcc fixed_in_debian]] + +For GCC trunk: + +Debian package has patches (for 4.3). Some have been forwarded upstream. (And +have been ignored.) [[Thomas_Schwinge|tschwinge]] is working on getting them +integrated. + + * [\[meta-bug\] bootstrap bugs for + \*-gnu\*](http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21824) + + * [build system: gcc\_cv\_libc\_provides\_ssp and + NATIVE\_SYSTEM\_HEADER\_DIR](http://gcc.gnu.org/ml/gcc/2008-10/msg00130.html) + + * [-fstack-protector shouldn't use TLS in freestanding + mode](http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29838) + + * [Tool chain configuration: GNU/\* sharing stuff with + GNU/Linux](http://gcc.gnu.org/ml/gcc/2007-11/msg00289.html) + + + +Additionally: + + * Configure fragments that have `*linux*` cases might/should often contain + those for us (and GNU/k*BSD) as well. + + * `libgcc/configure.ac` [might + need](http://gcc.gnu.org/ml/gcc-patches/2008-10/msg00315.html) to be + aligned for us to the `*linux*` cases. As well as at the end of + `libgcc/config.host`. Check. + + checking whether decimal floating point is supported... no + checking whether fixed-point is supported... no + + * `libgomp/configure.tgt` + + * [[`libmudflap`|libmudflap]]. + + * [[C++]]. diff --git a/open_issues/gcc/c++.mdwn b/open_issues/gcc/c++.mdwn new file mode 100644 index 00000000..cab4c1f1 --- /dev/null +++ b/open_issues/gcc/c++.mdwn @@ -0,0 +1,41 @@ +[[!meta copyright="Copyright © 2008, 2009 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled +[[GNU Free Documentation License|/fdl]]."]]"""]] + +[[!tag open_issue_porting open_issue_gcc fixed_in_debian]] + +Modify the [[hurd/building/cross-compiling]] shell script to configure GCC for +building GCC with C++ support when building its second (i.e., final) version. + +Compiling a most-trivial C++ program used to work with GCC 4.2 and 4.3 (and the +resulting binaries would also work), but linking fails with GCC SVN trunk: + + $ $TARGET-g++ -Wall a.cc -lpthread + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__multf3' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__fixunstfsi' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__subtf3' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__divtf3' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__copysigntf3' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__addtf3' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__lttf2' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__floatsitf' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__netf2' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__floatunsitf' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__eqtf2' + /home/thomas/tmp/gnu-0/lib/gcc/i586-pc-gnu/4.4.0/../../../../i586-pc-gnu/lib/libgcc_s.so: undefined reference to `__fabstf2' + collect2: ld returned 1 exit status + +Whether this defect report also applies to a natively-build GCC from SVN trunk +has not yet been checked. + +[[Thomas_Schwinge|tschwinge]] suspects the problem to be a configuration issue +of a GCC helper library, whose configuration setup has changed after GCC 4.3. + +The need for `-lpthread` is another story. See the Debian glibc patches +repository for details. diff --git a/open_issues/gcc/libmudflap.mdwn b/open_issues/gcc/libmudflap.mdwn new file mode 100644 index 00000000..f14ca1bc --- /dev/null +++ b/open_issues/gcc/libmudflap.mdwn @@ -0,0 +1,74 @@ +[[!meta copyright="Copyright © 2008, 2009 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled +[[GNU Free Documentation License|/fdl]]."]]"""]] + +[[!tag open_issue_porting open_issue_gcc]] + +Single-threaded use appears to work: + + $ echo 'int main(void) { int *a; a[10]=0; return a[5]; }' | ↩ + gcc -o a -fmudflap -x c - -lmudflap + $ ./a + ******* + mudflap violation 1 (check/write): time=1227208721.922064 ptr=0x1023de0 size=4 + pc=0x1037a33 location=`<stdin>:1:26 (main)' + /usr/lib/libmudflap.so.0(__mf_check+0x33) [0x1037a33] + ./a(main+0x7c) [0x80486c4] + /usr/lib/libmudflap.so.0(__wrap_main+0x49) [0x1037239] + Nearby object 1: checked region begins 68B before and ends 65B before + mudflap object 0x80ca268: name=`argv[]' + bounds=[0x1023e24,0x1023e2b] size=8 area=static check=0r/0w liveness=0 + alloc time=1227208721.922064 pc=0x10371d3 + Nearby object 2: checked region begins 76B before and ends 73B before + mudflap object 0x80cb448: name=`environ[]' + bounds=[0x1023e2c,0x1023ed7] size=172 area=static check=0r/0w liveness=0 + alloc time=1227208721.922064 pc=0x10371d3 + number of nearby objects: 2 + ******* + mudflap violation 2 (check/read): time=1227208721.942109 ptr=0x1023dcc size=4 + pc=0x1037a33 location=`<stdin>:1:35 (main)' + /usr/lib/libmudflap.so.0(__mf_check+0x33) [0x1037a33] + ./a(main+0xf3) [0x804873b] + /usr/lib/libmudflap.so.0(__wrap_main+0x49) [0x1037239] + Nearby object 1: checked region begins 88B before and ends 85B before + mudflap object 0x80ca268: name=`argv[]' + Nearby object 2: checked region begins 96B before and ends 93B before + mudflap object 0x80cb448: name=`environ[]' + number of nearby objects: 2 + +Multi-threaded use doesn't: + + $ echo 'int main(void) { int *a; a[10]=0; return a[5]; }' | ↩ + gcc -include pthread.h -o a -fmudflapth -x c - -lmudflapth -lpthread + $ ./a + Killed + $ gdb a + [...] + Starting program: /media/data/home/tschwinge/a + + Program received signal EXC_BAD_ACCESS, Could not access memory. + 0x01180653 in getenv () from /lib/libc.so.0.3 + (gdb) bt + #0 0x01180653 in getenv () from /lib/libc.so.0.3 + #1 0x01177a02 in __dcigettext () from /lib/libc.so.0.3 + #2 0x01176a57 in dcgettext () from /lib/libc.so.0.3 + #3 0x011c03b5 in strerror_r () from /lib/libc.so.0.3 + #4 0x01175b57 in __assert_perror_fail () from /lib/libc.so.0.3 + #5 0x0111f1ad in cthread_fork (func=0x114f630 <_hurd_msgport_receive>, arg=0x0) + at /build/buildd/hurd-20080607/build-tree/hurd/libpthread/pthread/cthreads-compat.c:41 + #6 0x0115713e in _hurdsig_init () from /lib/libc.so.0.3 + #7 0x01140852 in _hurd_proc_init@@GLIBC_2.2.6 () from /lib/libc.so.0.3 + #8 0x01140e86 in _hurd_init () from /lib/libc.so.0.3 + #9 0x011690ce in init1 () from /lib/libc.so.0.3 + #10 0x00001e96 in _dl_start_user () from /lib/ld.so + #11 0x00000001 in ?? () + #12 0x01024000 in ?? () + #13 0x00000000 in ?? () + +Also `libmudflap` is pthread-only. |