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authorCarmelo Amoroso <carmelo.amoroso@st.com>2012-01-03 19:09:56 +0100
committerCarmelo Amoroso <carmelo.amoroso@st.com>2012-01-13 12:22:59 +0100
commit4c9b7f3c21ff21c199e54bfad2fdf3445fa4573d (patch)
tree30d8a2f101cc1aa6e9b35273635fa9b3a6f2e1cf /Makefile.help
parenta7123b4744112deecb7aef771f224b680b4a02c0 (diff)
libc: allow to backtrace out of abort call
Build raise and abort function with dwarf2 info by using -fasynchronous-unwind-tables to make backtrace() working across a call to abort. A scenario where it could be useful is within a signal handler that wants to dump a backtrace when catching some signal (i.e SIGABRT). Without having abort & raise built with DWARF2 information, it is not possible for the libgcc stack unwinder to walk through the call stack out of the abort/raise function. Impacts in terms of size are really limited Current text data bss dec hex filename 164 0 0 164 a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os 164 0 0 164 a4 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS 220 24 4 248 f8 ./libc/stdlib/abort.os With (-fasynchronous-unwind-tables) text data bss dec hex filename 216 0 0 216 d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.os 216 0 0 216 d8 ./libpthread/nptl/sysdeps/unix/sysv/linux/raise.oS 280 24 4 308 134 ./libc/stdlib/abort.os Signed-off-by: Carmelo Amoroso <carmelo.amoroso@st.com> Acked-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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