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NickSoft Linux Cookbook
Quick howto's, Real live examples.
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NickSoft
Site Admin
Joined: 13 Nov 2006
Posts: 22
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 Posted: Mon May 21, 2007 12:45 pm Post subject: Libraries path or link to shared libraries. |
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In all howtos I've found they say linking is so easy, but it never works if the library is not in default system paths. Why? You use all options from the howto and it won't run - shared library is not found. That's because they always forgot one option -rpath. It is a linker option and gcc doesn't understand it. I heard that on free BSD gcc understands corresponding option -R and passes it to the linker, but I never tested it.You can try this on BSD:
| Code: | | gcc -L/usr/local/path-to-lib -R/usr/local/path-to-lib -o program program.c -lmylib |
Note that this won't work on linux!!!
On linux there are 2 ways:
1. if you compile other software and you don't want to change makefile use LD_RUN_PATH environment variable:
| Code: | | LD_RUN_PATH=/usr/local/path-to-lib make |
or
| Code: | export LD_RUN_PATH=/usr/local/path-to-lib
gcc -o myprogram myprogram.c |
2. Use -Wl (l is small L) to pass options to linker:
| Code: | | gcc -L/usr/local/path-to-lib -Wl,-rpath,/usr/local/path-to-lib -o program program.c -lmylib |
So simple makefile should look like:
| Code: | CC = gcc
CFLAGS = -O2 -Wall -I/usr/local/mysql/include/mysql
LDFLAGS = -Wl,-rpath,/usr/local/mysql/lib/mysql -L/usr/local/mysql/lib/mysql -lmysqlclient
OBJECTS = myprogram.o
TARGETS = myprogram
EXEC = myprogram
all: $(TARGETS)
install: all
cp $(EXEC) /usr/local/bin/myprogram
myprogram: $(OBJECTS)
$(CC) -s -o $(EXEC) $(LDFLAGS) $(OBJECTS)
clean:
rm -f *.o cut out $(EXEC) |
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