Oh, yeah:
$ ls -l /usr/lib/x86_64-linux-gnu/libGL.so
lrwxrwxrwx 1 root root 48 Aug 23 16:57 /usr/lib/x86_64-linux-gnu/libGL.so -> /etc/alternatives/glx--libGL.so-x86_64-linux-gnu
$ ls -l /etc/alternatives/glx--libGL.so-x86_64-linux-gnu
lrwxrwxrwx 1 root root 48 Aug 23 16:57 /etc/alternatives/glx--libGL.so-x86_64-linux-gnu -> /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so
nou, thanks a lot! I've spent already many hours figuring out the reason, but that somebody would open libGL.so without .1!
| ftruncate(17, 0) | = 0 |
| lseek(17, 0, SEEK_SET) | = 0 |
write(17, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\2\0\362\3\1\0\0\0\0\0\0\0\0\0\0\0"..., 171516) = 171516
| lseek(17, 0, SEEK_END) | = 171516 |
| lseek(17, 0, SEEK_SET) | = 0 |
read(17, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\2\0\362\3\1\0\0\0\0\0\0\0\0\0\0\0"..., 171516) = 171516
| close(17) | = 0 |
| unlink("/tmp/OCLqq0I50") | = 0 |
| munmap(0x7f6e1aae9000, 528384) | = 0 |
sysinfo({uptime=16657, loads=[49792, 58816, 100896] totalram=4088778752, freeram=205926400, sharedram=0, bufferram=67231744} totalswap=1096806400, freeswap=1096708096, procs=318}) = 0
clock_getres(CLOCK_MONOTONIC, {0, 1}) = 0
| open("/proc/cpuinfo", O_RDONLY) | = 17 |
read(17, "processor\t: 0\nvendor_id\t: Authen"..., 8191) = 3601
| close(17) | = 0 |
| open("/proc/self/maps", O_RDONLY) | = 17 |
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
fstat(17, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6e1ab69000
read(17, "00400000-00405000 r-xp 00000000 "..., 1024) = 1024
read(17, "rw-p 00000000 00:00 0 \n7f6e1bf6a"..., 1024) = 1024
read(17, "ib/x86_64-linux-gnu/libXinerama."..., 1024) = 1024
| read(17, "000 08:05 921323 | "..., 1024) = 1024 |
read(17, "ibICE.so.6.3.0\n7f6e20dac000-7f6e"..., 1024) = 1024
| read(17, "00 08:05 919749 | "..., 1024) = 1024 |
read(17, "nu/libxcb.so.1.1.0\n7f6e21846000-"..., 1024) = 1024
read(17, "-linux-gnu/libX11.so.6.3.0\n7f6e2"..., 1024) = 1024
read(17, "/libGLU.so.1.3.08004\n7f6e2242f00"..., 1024) = 1024
| read(17, "5 1306948 | /li"..., 1024) = 1024 |
| read(17, "5 917880 | /us"..., 1024) = 1024 |
read(17, "000 ---p 000be000 08:05 967121 "..., 1024) = 1024
| read(17, " | /usr/lib/x86_64-"..., 1024) = 1024 |
read(17, "f6e23e53000 rw-s 00002000 00:05 "..., 1024) = 629
| close(17) | = 0 |
| munmap(0x7f6e1ab69000, 4096) | = 0 |
sched_getaffinity(22211, 32, {f, 0, 0, 0}) = 32
| close(13) | = 0 |
| munmap(0x7f6e1d6f6000, 4096) | = 0 |
| getdents(12, /* 0 entries */, 32768) | = 0 |
| close(12) | = 0 |
| open("/etc/ld.so.cache", O_RDONLY) | = 12 |
fstat(12, {st_mode=S_IFREG|0644, st_size=122514, ...}) = 0
mmap(NULL, 122514, PROT_READ, MAP_PRIVATE, 12, 0) = 0x7f6e1ab4c000
| close(12) | = 0 |
| access("/etc/ld.so.nohwcap", F_OK) | = -1 ENOENT (No such file or directory) |
open("/usr/lib/x86_64-linux-gnu/libGL.so", O_RDONLY) = 12 <------------------------------------------------------------------<
read(12, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\322\1\0\0\0\0\0"..., 832) = 832
| lseek(12, 378924, SEEK_SET) | = 378924 |
read(12, "\4\0\0\0\20\0\0\0\1\0\0\0GNU\0\0\0\0\0\2\0\0\0\4\0\0\0\24\0\0\0", 32) = 32
fstat(12, {st_mode=S_IFREG|0644, st_size=391896, ...}) = 0
mmap(NULL, 2489544, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 12, 0) = 0x7f6e1a8ec000
mprotect(0x7f6e1a949000, 2093056, PROT_NONE) = 0
mmap(0x7f6e1ab48000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 12, 0x5c000) = 0x7f6e1ab48000
| close(12) | = 0 |
| access("/etc/ld.so.nohwcap", F_OK) | = -1 ENOENT (No such file or directory) |
open("/usr/lib/x86_64-linux-gnu/libglapi.so.0", O_RDONLY) = 12
read(12, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\210\0\0\0\0\0\0"..., 832) = 832
| lseek(12, 131812, SEEK_SET) | = 131812 |
read(12, "\4\0\0\0\20\0\0\0\1\0\0\0GNU\0\0\0\0\0\2\0\0\0\4\0\0\0\24\0\0\0", 32) = 32
fstat(12, {st_mode=S_IFREG|0644, st_size=145264, ...}) = 0
mmap(NULL, 2246504, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 12, 0) = 0x7f6e1a6c7000
mprotect(0x7f6e1a6e8000, 2093056, PROT_NONE) = 0
mmap(0x7f6e1a8e7000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 12, 0x20000) = 0x7f6e1a8e7000
mmap(0x7f6e1a8ea000, 5992, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f6e1a8ea000
close(12)
And it is not clear, where in clCreateContext it occurs:
$ grep libGL.so /proc/27926/maps
7ffff778b000-7ffff7849000 r-xp 00000000 08:05 967121 /usr/lib/x86_64-linux-gnu/fglrx/fglrx-libGL.so.1.2
7ffff7849000-7ffff7949000 ---p 000be000 08:05 967121 /usr/lib/x86_64-linux-gnu/fglrx/fglrx-libGL.so.1.2
7ffff7949000-7ffff7970000 rwxp 000be000 08:05 967121 /usr/lib/x86_64-linux-gnu/fglrx/fglrx-libGL.so.1.2
Breakpoint 1, CreateContext () at GLinterop.cpp:391
391 context = clCreateContext(contextProperties, 1, &cdDevices[0], NULL, NULL, &errNum);
(gdb) s
warning: Temporarily disabling breakpoints for unloaded shared library "/usr/lib/x86_64-linux-gnu/dri/swrast_dri.so"
395 if (errNum != CL_SUCCESS)
(gdb)
$ grep libGL.so /proc/27926/maps
7fffeea93000-7fffeeaf0000 r-xp 00000000 08:05 1052026 /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2
7fffeeaf0000-7fffeecef000 ---p 0005d000 08:05 1052026 /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2
7fffeecef000-7fffeecf3000 rw-p 0005c000 08:05 1052026 /usr/lib/mesa-diverted/x86_64-linux-gnu/libGL.so.1.2
7ffff778b000-7ffff7849000 r-xp 00000000 08:05 967121 /usr/lib/x86_64-linux-gnu/fglrx/fglrx-libGL.so.1.2
7ffff7849000-7ffff7949000 ---p 000be000 08:05 967121 /usr/lib/x86_64-linux-gnu/fglrx/fglrx-libGL.so.1.2
7ffff7949000-7ffff7970000 rwxp 000be000 08:05 967121 /usr/lib/x86_64-linux-gnu/fglrx/fglrx-libGL.so.1.2
And here they are.
Just to export /usr/lib/x86_64-linux-gnu/fglrx/ wouldn't work, because there is no libGL.so. Temporary solution would be in the project dir:
ln -s /usr/lib/x86_64-linux-gnu/fglrx/fglrx-libGL.so.1.2 libGL.so
LD_LIBRARY_PATH=. ./my_prog
