[Bug gas/16765] New: Assertion failure in create_unwind_entry

[address@hidden]

https://sourceware.org/bugzilla/show_bug.cgi?id=16765

            Bug ID: 16765
           Summary: Assertion failure in create_unwind_entry
           Product: binutils
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: address@hidden

Created attachment 7499
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7499&action=edit
Assembly produced if gcc invoked manually

I try to compile gcc with sjlj exceptions enabled, however, the build fails at
libstdc++. It's probably a gcc bug but it triggers an assertion in gas.

GCC command:

/opt/nspire/Ndless/ndless-sdk/toolchain/build/./gcc/xgcc -shared-libgcc
-B/opt/nspire/Ndless/ndless-sdk/toolchain/build/./gcc -nostdinc++
-L/opt/nspire/Ndless/ndless-sdk/toolchain/build/arm-none-eabi/libstdc++-v3/src
-L/opt/nspire/Ndless/ndless-sdk/toolchain/build/arm-none-eabi/libstdc++-v3/src/.libs
-B/opt/nspire/Ndless/ndless-sdk/toolchain/install/arm-none-eabi/bin/
-B/opt/nspire/Ndless/ndless-sdk/toolchain/install/arm-none-eabi/lib/ -isystem
/opt/nspire/Ndless/ndless-sdk/toolchain/install/arm-none-eabi/include -isystem
/opt/nspire/Ndless/ndless-sdk/toolchain/install/arm-none-eabi/sys-include
-I/opt/nspire/Ndless/ndless-sdk/toolchain/gcc-4.8.2/libstdc++-v3/../libgcc
-I/opt/nspire/Ndless/ndless-sdk/toolchain/build/arm-none-eabi/libstdc++-v3/include/arm-none-eabi
-I/opt/nspire/Ndless/ndless-sdk/toolchain/build/arm-none-eabi/libstdc++-v3/include
-I/opt/nspire/Ndless/ndless-sdk/toolchain/gcc-4.8.2/libstdc++-v3/libsupc++
-Wall -Wextra -Wwrite-strings -Wcast-qual -Wabi
-fdiagnostics-show-location=once -ffunction-sections -fdata-sections
-frandom-seed=eh_alloc.lo -mcpu=arm926ej-s -fpic -mlong-calls -c
../../../../gcc-4.8.2/libstdc++-v3/libsupc++/eh_alloc.cc -o eh_alloc.o

Output:

/tmp/cc6EsAB0.s: Assembler messages:
/tmp/cc6EsAB0.s:320: Error: missing .fnstart before unwinding directive
/tmp/cc6EsAB0.s:320: Error: duplicate .personality directive
/tmp/cc6EsAB0.s:321: Error: missing .fnstart before unwinding directive
/tmp/cc6EsAB0.s:321: Internal error!
Assertion failure in create_unwind_entry at
../../binutils-2.24/gas/config/tc-arm.c line 20915.
Please report this bug.

Sadly I can't give the commands gcc executes as this doesn't happen if I
execute the command manually. Probably other environment vars set in the GCC
Makefile. I attached the .s file gcc gives me with -s if I execute it manually,
maybe it's helpful.

GCC configure options:

--target=arm-none-eabi --prefix=$PREFIX --enable-interwork --disable-multilib
--enable-languages="c,c++" --enable-sjlj-exceptions --with-system-zlib
--with-newlib --disable-shared --with-gnu-as --with-gnu-ld --with-float=soft
--disable-werror

binutils configure options:

--target=arm-none-eabi --prefix=$PREFIX --enable-interwork --disable-multilib
--with-system-zlib --with-gnu-as --with-gnu-ld --disable-nls --with-float=soft
--disable-werror

I run make with CXXFLAGS_FOR_TARGET="-mcpu=arm926ej-s -fpic -mlong-calls"

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