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Static Linked on Linux and Win32: msg#00181

apache.apr.devel

Subject: Static Linked on Linux and Win32

Hi, I'm really excited to use APR, but I'm having trouble getting my "Hello
World" application to work with static linkage, on both Linux and Win32.

Basically, I have a single-file application:

# // Main.cpp
# #include <iostream>
# #include "apr.h"
# #include "apr_general.h"
#
# using namespace std;
#
# // main
# int main( int argc, char const* const* argv )
# {
# cout << "Hello world!";
#
# // Start APR
# apr_app_initialize( &argc, &argv, 0 );
#
# unsigned char buf[10];
# apr_generate_random_bytes( buf, 10 );
#
# // Done
# apr_terminate( );
# return 0;
# }

I can successfully compile, link, and execute the file on Win32 with APR
1.0.0 when linking with the dynamic library:

# $APRBASE\Debug\libapr-1.lib
# $APRBASE\Debug\libapr-1.dll

However, if I try to link with the static library on Win32:

# $APRBASE\libd\apr-1.lib

I get the following linker errors:

# Linking...
# main.obj : error LNK2019: unresolved external symbol __imp__apr_terminate
referenced in function _main
# main.obj : error LNK2019: unresolved external symbol
__imp__apr_generate_random_bytes@8 referenced in function _main
# main.obj : error LNK2019: unresolved external symbol
__imp__apr_app_initialize@12 referenced in function _main
# Debug/APRtest.exe : fatal error LNK1120: 3 unresolved externals

Likewise, I can compile and link on Linux (Fedora Core 2) using the shared
library using the following Ant build file:

# <project name="aprtest" default="compile">
# <target name="compile">
# <exec executable="g++">
# <arg value="-oaprtest"/>
# <arg value="-I./unixlibs/apr-1/include/apr-1"/>
# <arg value="-L./unixlibs/apr-1/lib"/>
# <arg value="-lapr-1"/>
# <arg value="-shared"/>
# <arg file="main.cpp"/>
# </exec>
# </target>
# </project>

But if I change line 8 from "-shared" to "-static", I get the following
linker errors:

# compile:
# [exec] /tmp/ccNWTzJF.o(.text+0x33): In function `main':
# [exec] : undefined reference to `apr_app_initialize'
# [exec] /tmp/ccNWTzJF.o(.text+0x44): In function `main':
# [exec] : undefined reference to `apr_generate_random_bytes'
# [exec] /tmp/ccNWTzJF.o(.text+0x4c): In function `main':
# [exec] : undefined reference to `apr_terminate'
# [exec] collect2: ld returned 1 exit status

So, I'm seeing the exact same problem on both platforms. Obviously I'm
doing something wrong, and I'm hoping it's something simple. Does anyone
see what I should do differently to get static linkage to work?

-david




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