foo_exe.c

#include <stdio.h>
// #include <zlib.h>
#include "libfoo.h"

int main() {
    // printf("libz version: %s\n", zlibVersion());
    printf("libz version via libfoo: %s\n", zlibv());
}

libfoo.c

#include <zlib.h>

const char * zlibv(void) {
    return zlibVersion();
}

libfoo.h

char * zlibv(void);

meta.yaml

package:
  name: test-pkg
  version: 1.0

outputs:
  - name: libfoo
    build:
      script:
        - env | sort
        - mkdir -p $PREFIX/lib
        - mkdir -p $PREFIX/include
        - $CC $CFLAGS $LDFLAGS -lz -shared -o $PREFIX/lib/libfoo${SHLIB_EXT} ${RECIPE_DIR}/libfoo.c
    requirements:
      build:
        - {{ compiler('c') }}
      host:
        - zlib
    
    test:
      commands:
        - test -f $PREFIX/lib/libfoo${SHLIB_EXT}

  - name: foo_exe
    build:
      script:
        - mkdir -p $PREFIX/bin
        - $CC $CFLAGS $LDFLAGS -lfoo ${RECIPE_DIR}/foo_exe.c -o $PREFIX/bin/foo
    requirements:
      build:
        - {{ compiler('c') }}
      host:
        - {{ pin_subpackage('libfoo', exact=True) }}
      run:
        - {{ pin_subpackage('libfoo', exact=True) }}
    test:
      commands:
        - test -f $PREFIX/lib/libfoo${SHLIB_EXT}
        - test -f $PREFIX/bin/foo
        - foo