On Thu, 2008-04-24 at 11:26 +0300, Bogdan Cristea wrote:

I use semaphores in a C++ class, but I get errors when linking my programs. Below is the output when compiling and linking the programs. It seems that the functions related to semaphores are not found by the linker. Could you advise please?

g++ -c -ansi -pedantic -Werror -Wall -O3 -W -Wconversion -Wshadow -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings -fshort-enums -fno-common use_cb.cpp -o use_cb.o g++ -c -ansi -pedantic -Werror -Wall -O3 -W -Wconversion -Wshadow -Wpointer-arith -Wcast-qual -Wcast-align -Wwrite-strings -fshort-enums -fno-common CB.cpp -o CB.o g++ use_cb.o CB.o -o use_cb CB.o: In function `CB::reset()': CB.cpp:(.text+0x1e5): undefined reference to `sem_destroy' CB.cpp:(.text+0x200): undefined reference to `sem_init' CB.o: In function `CB::create(int const&)': CB.cpp:(.text+0x266): undefined reference to `sem_init' CB.o: In function `CB::write(char const*, int const&)': CB.cpp:(.text+0x35f): undefined reference to `sem_post' CB.o: In function `CB::read(char*, int const&)': CB.cpp:(.text+0x3e7): undefined reference to `sem_wait' CB.o: In function `CB::clear()': CB.cpp:(.text+0x565): undefined reference to `sem_destroy' CB.cpp:(.text+0x580): undefined reference to `sem_init' CB.o: In function `CB::release()': CB.cpp:(.text+0x5dc): undefined reference to `sem_destroy' CB.cpp:(.text+0x5f7): undefined reference to `sem_init' CB.cpp:(.text+0x62f): undefined reference to `sem_destroy' collect2: ld returned 1 exit status make: *** [use_cb] Error 1

#include man sem_init may also help

-- Bogdan Cristea -- Roger Oberholtzer

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