I am trying to build a shared library that internally links openssl and
crypto libraries statically so I can use it in a production environment. To
that end I am using the following Makefile
APPBASE=/home/AB/Documents/APP/APP_2.17.0
OPENSSL1.0.2p_INSTALL_LOC=/home/AB/Documents/APP/OpenSSL-1.0.2p-installation
CC=gcc
CFLAGS= -Wall -g -O -fPIC
RM= rm -f
.PHONY: all clean
src=$(wildcard *Generic/*.c *Linux/*.c)
$(info source=$(src))
#we use the custom compiled openssl version
#and NOT the one available on the system
#INC=-I/usr/include/openssl
INC+=-I$(OPENSSL1.0.2p_INSTALL_LOC)/include/openssl
INC+=$(foreach d,$(incdir),-I$d)
$(info includes=$(INC))
LIB=-L$(OPENSSL1.0.2p_INSTALL_LOC)/lib
#LIB=-llibssl -llibcrypto
LIB+=-lssl -lcrypto
$(info links=$(LIB))
#LIB+=-L/usr/lib/
obj=$(src:.c=.o)
all: libAPP.so
clean:
$(RM) *.o *.so
$(shell find $(APPBASE) -type f -iname "*.o" -exec rm -rf {} \;)
.c.o:
${CC} -static ${CFLAGS} $(INC) -c $< $(LIB) -o $@
libAPP.so: $(obj)
$(LINK.c) -shared $^ -o $@
As mentioned here (
https://stackoverflow.com/questions/18185618/how-to-use-static-linking-with-openssl-in-c-c/25811538#25811538),
I've changed the linker flags to:
-lcrypto -lz -ldl -static-libgcc
but it doesn't seem to change the size of the generated so file. On
checking for references to SSL in this so file, I see there are a total of
87 entries
nm libAPP.so | grep -i "ssl" | wc -l
87
whereas listing *only* the global symbols from libssl.a tells me it has
1113 globally defined symbols.
nm -g ../OpenSSL-1.0.2p-installation/lib/libssl.a | grep -i "ssl" | wc -l
1113
I do not know if libSSL got indeed linked statically or not. Could someone
please shed some light on it?
--
Best Regards,
Aijaz Baig
