Re: [Mingw-users] LNK4003: invalid library format & extern "C"

[Keith M. <kei...@to...>]

Damian Donnelly wrote:

> The resulting ffpis.lib isn't a valid library. I could link both libs in
> separately, but I would prefer to have just one binary. I'm 
investigating
> how to do this, but if anyone already knows, I'd be grateful of help.
>
> ...I guess that they should be properly linked with a linker.

No, I don't think that's going to help, unless it's a DLL you are
trying to build.

Offhand, I don't know of a direct way to merge two static libraries
into one; (that's not to say that there isn't one; no doubt someone
will enlighten us, if there is).

Here is a brute force technique, which should work:
$ cat Makefile
all: foo.exe

foo.c:
        echo '#include <stdio.h>' > $@
        echo 'int main(){fee();fie();foe();fum();return 0;}' >> $@

fee.c fie.c foe.c fum.c:
        echo 'void $*(){printf("This is function '"'$*'"'\n");}' > $@

feefie.lib: fee.o fie.o; ar rcS $@ $^
foefum.lib: foe.o fum.o; ar rcS $@ $^

foobar.lib: feefie.lib foefum.lib
        for lib in $^; do \
          ofiles=`ar t $$lib`; \
          ar x $$lib $$ofiles; \
          ar rc $@ $$ofiles; \
        done
        ranlib $@

foo.exe: foo.c foobar.lib
        gcc -o $@ foo.c -L. -lfoobar

HTH,
Keith.