Alasdair on Everything

Text relocation remains against symbol, libx264

May 19th, 2009

Just a very quick post regarding libx264.

If you are getting errors such as:

# gcc -shared -o libx264.so.67 common/mc.o common/predict.o common/pixel.o common/macroblock.o common/frame.o common/dct.o common/cpu.o common/cabac.o common/common.o common/mdate.o common/set.o common/quant.o common/vlc.o encoder/analyse.o encoder/me.o encoder/ratecontrol.o encoder/set.o encoder/macroblock.o encoder/cabac.o encoder/cavlc.o encoder/encoder.o extras/getopt.o  -Wl,-h,libx264.so.67 -lm -lpthread -s
Text relocation remains                         referenced
    against symbol                  offset      in file
                           0x6be       common/mc.o
                           0x6d5       common/mc.o
                           0xbbe       common/mc.o
                           0xbc5       common/mc.o
...
__udivdi3                           0x3809      common/set.o
__udivdi3                           0x3875      common/set.o
__udivdi3                           0x10cf      encoder/macroblock.o
__divdi3                            0x17865     encoder/analyse.o
__divdi3                            0x1e9       encoder/set.o
ld: fatal: relocations remain against allocatable but non-writable sections
collect2: ld returned 1 exit status

then simply add “-mimpure-text -lrt” to your LDFLAGS.

A quick note to self, “gcc -shared” is better than “gcc -G”. The former tells gcc to build a shared object, which tells the linker (I suppose). The latter just tells the linker. Swapping a -shared for -G can fix the above issue, but creates other issues. Or something along those lines - I’m a bit hazy on this one.

This issue came about because I was getting errors when running a 64bit amd64 ffmpeg linked against libx264:

ld.so.1: ffmpeg: fatal: relocation error: R_AMD64_PC32: file /opt/ec/lib/amd64/libx264.so.67: symbol main: value 0x280018fc805 does not fit

The problem here was that I’d compiled libx264 with gcc -G instead of gcc -shared. However using -shared generated the “Text relocation remains against symbol” errors, which needed the “-mimpure-text -lrt” fix.

Entry Filed under: General