Properly include GLib headers with autotools

问题:

In my normal dev environment (ubuntu), I don't have any issues linking against GLib-2.0, however when I attempt to build on fresh install of Debian Squeeze, I run into errors linking GLib.

configure.ac:

...
AC_PROG_CC
AM_PROG_CC_C_O
CFLAGS="$CFLAGS -Wall -W -Wno-unused-parameter -std=c99 -pedantic"

PKG_CHECK_MODULES(MYAPP, [glib-2.0 >= 2.3.0  gthread-2.0])

LIBS="$LIBS $MYAPP_LIBS"

AC_CONFIG_FILES([Makefile src/Makefile])
AC_OUTPUT

Autotools appears to pass the correct options to gcc:

-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -lgthread-2.0 -lglib-2.0

However, running make I get a compile error: undefined reference to 'g_list_free_full'

To verify the libraries are actually installed:

$ dpkg --get-selections | grep glib
libglib2.0-0                    install
libglib2.0-data                 install
libglib2.0-dev                  install

Any thoughts?

回答1:

Something to notice:

   stormfs_LDADD = $(LIBS) $(LIBGCRYPT_LIBS)
>> stormfs_LDFLAGS = $(STORMFS_LIBS)                                               

(See Linker flags in wrong place here on SO.)
That ought to be:

stormfs_LDADD = ${LIBS} ${LIBGCRYPT_LIBS} ${STORMFS_LIBS}

(That is however sort of redundant because both LIBS and STORMFS_LIBS contain the same value, just as I looked at the generated Makefile.)

Edit:

nm -D /usr/lib64/libglib-2.0.so | grep g_list_free_full
0000000000042740 T g_list_free_full

So libglib.so (your path to it may vary) does include g_list_free_full in at least glib2-2.30.1. According to the documentation, this function is only available since glib2-2.28, but your installation is likely just too old. Best use (and preferably just one pkg dependency per variable, to ease detection of what exactly of the [deps] part could not be found):

#configure.ac
PKG_CHECK_MODULES([libgthread], [gthread-2.0])
PKG_CHECK_MODULES([libglib], [glib-2.0 >= 2.28])