Error: hammer ABI contains Genode-internal symbol '__bss_start'

[Christian Helmuth]

Hello Guido,

On Wed, Jan 09, 2019 at 11:55:50PM +0100, Guido Witmond wrote:
> I created the lib/symbols/hammer file by
> 
> ! tool/abi_symbols bin/hammer.lib.so
> 
> Then I run the build:
> 
> ! ~/genode/tool/depot/create guido/bin/x86_64/hammer UPDATE_VERSIONS=1
>   FORCE=1 KEEP_BUILD_DIR=1
> 
> It starts good:
> ! created guido/api/base/2018-11-23
> ! created guido/api/hammer/2019-01-08
> ! created guido/api/libc/2018-11-26
> ! created guido/src/hammer/2019-01-08-a
> 
> However, I get this error during the compile of hammer.
> ! MERGE    hammer.lib.so
> ! Error: hammer ABI contains Genode-internal symbol '__bss_start',
> ! Error: hammer ABI contains Genode-internal symbol '__eh_frame_start__'
> all from the symbol_blacklist defined in check_abi.
> 
> It ends with this error: recipe for target 'hammer.lib.checked' failed

I suggest you remove symbols from the list that should not be exported
by the library. The same is true for expat

  > /tool/abi_symbols build/x86_64/var/libcache/expat/expat.lib.so > /tmp/expat.symbols
  > diff -u repos/libports/lib/symbols/expat /tmp/expat.symbols
  --- repos/libports/lib/symbols/expat	2018-12-05 16:27:41.427653704 +0100
  +++ /tmp/expat.symbols	2019-01-10 09:26:40.289152230 +0100
  @@ -79,3 +79,16 @@
   XmlSizeOfUnknownEncoding T
   XmlUtf16Encode T
   XmlUtf8Encode T
  +__bss_start R 0
  +__eh_frame_start__ R 0
  +__exidx_end D 0
  +__exidx_start D 0
  +__l4sys_invoke_indirect D 0
  +_ctors_end D 0
  +_ctors_start D 0
  +_edata R 0
  +_end R 0
  +_init T
  +_parent_cap D 0
  +_parent_cap_local_name D 0
  +_parent_cap_thread_id D 0

The abi_symbols tool is just a handy utility to generate a list of
potential ABI symbols, which must be manually amended/checked.

Greets
-- 
Christian Helmuth
Genode Labs

https://www.genode-labs.com/ · https://genode.org/
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