将'libconfig'构建为32位库

Question

I am trying to use the libconfig ( http://www.hyperrealm.com/libconfig/ ) for a little utility I am trying to write. I am trying to build libconfig then copy the library file (libconfig.a) to my utility's directory. When I build my utility I get warnings about the architecture being incompatible. Here is one of the specific warning messages I receive.

/usr/bin/ld: warning: i386:x86-64 architecture of input file 'libconfig.a(libconfig_la-libconfig.o)' is incompatible with i386 output

I am building on a Red Hat Enterprise Linux Server release 5.10 machine ( uname -m produces 'x86_64' ). I tried building libconfig with the following:

configure --disable-cxx CFLAGS='-m32' LDFLAGS='-m32'

But unfortunately, this didn't seem to produce the correct library as I still see the same warnings. There are other utilities that are created during the build process and all utilities share make common make directives which are specifying CFLAGS = -m32 -Wextra -Wall -Werror -Os and LDFLAGS = -m32 , so I am unable to change this behavior.

I have also tried configure --disable-cxx CFLAGS='-arch i386' LDFLAGS='-arch i386 , but this command line will not build the library.

Does anyone know how to build the libconfig as a 32-bit library to be consumed correctly.

Thanks,
Mark

Answer 1

The configure script will ignore arguments like CFLAGS= when passed on the command line. You need to set them for the invocation of configure, ie something like:

env CFLAGS=-m32 LDFLAGS=-m32 ./configure --disable-cxx

When this is done, all the symbols listed in the resulting lib/.libs/libconfig.a are listed with 32-bit addresses when the library is rebuilt.

Note in the configure script help output it does say:

Some influential environment variables:

which means that they need to be environment variables, not passed in as parameters to the command