[fpc-pascal] Linux i386 libraries and PIC
ludo.brands at free.fr
Wed Jun 1 15:22:58 CEST 2011
I'm trying to create a library on linux i386 that contains only PIC code.
The library is a driver that runs unconfined causing SELinux (Fedora) to
block the loading of the library.
The library is compiled with -fPIC but eu-findtextrel reports a lot of
relocations (4933 in my library and 3852 in a small testlibrary). The
problem seems to be that the RTL isn't compiled with -fPIC. And that is
where I need your help. Here is what I tried so far (fpc 2.5.1 svn 17622):
1) (bootstrap compiler 2.4.4)
make clean all OPT="-fPIC"
--> EAccessViolation when compiling system.pp with ppc386 (the bootstrap)
2) (bootstrap compiler 2.5.1 build with make clean all)
make clean all OPT="-fPIC" PP=/path/to/2.5.1/compiler
--> EAccessViolation when compiling ../unix/classes with ppc1
Compiler doesn't need to be PIC. So try rebuilding rtl only.
3) (fpc 2.4.4)
make clean all OPT="-g -gw"
make clean OPT="-fPIC -g -gw"
--> EAccessViolation when compiling system.pp
4) (still in dir rtl)
make clean OPT="-fPIC -g -gw" PP=/path/to/2.5.1/compiler
sudo make install
--> changed checksum for system.pp, recompile cairo, can't find unit cairo
sudo make install OPT="-Fu/path/to/svn/packages/*/src/"
sudo make sourceinstall PP=/path/to/2.5.1/compiler
All OK. RTL should be PIC now. Rebuild testlibrary. Result from
eu-findtextrel 38: relocations for the testproject. Much, much better, but
not zero :(
Although the compiler (and the testproject) was build with -g -gw,
eu-findtextrel doesn't provide any usefull info on the relocation. It only
says "the file containing the function 'test' might not be compiled with
-fpic/-fPIC" for avery relocation found.
eu-readelf -r shows 9692 386_relative and 4 386_JMP_SLOT type relocations.
What did I do wrong? Or is a rtl PIC not enough?
BTW. Linux x64 works perfectly. 0 relocations and a happy SELinux.
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