This is the mail archive of the gdb-patches@sourceware.org mailing list for the GDB project.
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |
Other format: | [Raw text] |
Hello, This patch is for the defect 21187 ( https://sourceware.org/bugzilla/show_bug.cgi?id=21187 ). I am attaching the patch to configure.ac file in which I have provided a configure option "--disable-staticlib" to link libstdc++ and libgcc library to GCC dynamically. ==== Motivation for the change ==== When linked statically with libstdc++ and libgcc on AIX platform, GDB is facing broken exception handling issues. Following is the error output when GDB is linked statically with mentioned libraries: (GDB-7.12.1, built with GCC-6.2, 64 bit mode, AIX platform): # ./gdb GNU gdb (GDB) 7.12.1 Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "powerpc64-ibm-aix7.2.0.0". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word". (gdb) kill terminate called after throwing an instance of 'gdb_exception_RETURN_MASK_ERROR' IOT/Abort trap (core dumped) ==== Testing ==== I have manually built and tested GDB-7.12.1 with this patch on AIX-7.2 and Ubuntu-16.04 with GCC-6.2 and GCC-4.8.5. On both operating system GDB is working fine with the patch. Output on AIX-7.2: # ./gdb GNU gdb (GDB) 7.12.1 Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "powerpc64-ibm-aix7.2.0.0". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word". (gdb) kill The program is not being run. ==== Context ==== The issue came in picture in November and have discussed here: https://sourceware.org/ml/gdb/2017-02/msg00047.html I have tested the issue on GDB-7.12.1 built with GCC-4.8.5, both 32 and 64 bit object mode on AIX platform. The 64 bit mode does NOT have this issue, but 32 bit mode has broken exception handling. The issue is same with GDB-7.12.1 built with GCC-6.2, 64 bit mode on AIX platform. GCC is not able to handle the exceptions properly and GDB is leading to core dump. On Ubuntu-16.04, and other platforms, there is no such issue. I believe this issue is specifically for AIX. Please find the attachment for patch and ChangeLog. Thanks and Regards, Nitish K Mishra
Attachment:
ChangeLog.txt
Description: Text document
diff --git a/configure.ac b/configure.ac index 3ec86c1..9bbb024 100644 --- a/configure.ac +++ b/configure.ac @@ -471,6 +471,13 @@ ENABLE_LIBSTDCXX=default) noconfigdirs="$noconfigdirs target-libstdc++-v3" fi] +AC_ARG_ENABLE(staticlib, +AS_HELP_STRING([--disable-staticlib], + [do not link libstdc++ and libgcc library statically]), +have_static_lib=$enableval, +have_static_lib=yes) + + # If this is accelerator compiler and its target is intelmic we enable # target liboffloadmic by default. If this is compiler with offloading # for intelmic we enable host liboffloadmic by default. Otherwise @@ -1406,9 +1413,10 @@ if test -z "$LD"; then fi fi -# Check whether -static-libstdc++ -static-libgcc is supported. -have_static_libs=no -if test "$GCC" = yes; then +# If enable_staticlib is set for configuration, check whether -static-libstdc++ -static-libgcc is supported + +if test "$have_static_lib" = yes; then + if test "$GCC" = yes; then saved_LDFLAGS="$LDFLAGS" LDFLAGS="$LDFLAGS -static-libstdc++ -static-libgcc" @@ -1424,6 +1432,7 @@ int main() {}], AC_LANG_POP(C++) LDFLAGS="$saved_LDFLAGS" + fi fi ACX_PROG_GNAT @@ -1741,6 +1750,9 @@ AC_ARG_WITH(stage1-ldflags, # trust that they are doing what they want. if test "$stage1_libs" = "" -a "$have_static_libs" = yes; then stage1_ldflags="-static-libstdc++ -static-libgcc" + else + # If static lib is disabled. + stage1_ldflags="" fi]) AC_SUBST(stage1_ldflags) @@ -1768,8 +1780,11 @@ AC_ARG_WITH(boot-ldflags, # In stages 2 and 3, default to linking libstdc++ and libgcc # statically. But if the user explicitly specified the libraries to # use, trust that they are doing what they want. - if test "$poststage1_libs" = ""; then + if test "$poststage1_libs" = "" -a "$have_static_lib" = yes; then poststage1_ldflags="-static-libstdc++ -static-libgcc" + else + # If static lib is disabled. + poststage1_ldflags="" fi]) AC_SUBST(poststage1_ldflags)
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |