On 20/09/11 16:31, Patrick Welche wrote:
On Mon, Sep 19, 2011 at 03:34:22PM +0200, Alessandro Candini wrote:
Hi everyone.
I have a problem making ltdl library work with some C++ code.
I have implemented my personal version of the example at the end of
Chapter 7 in the book "Autotools" by John Calcote.
Basically it is the same, but I have C++ source files and I use g++
instead of gcc.
Configure and make works but I do not produce a dynamic linked
executable, unlike the original John's example:
../src $ ldd hello
not a dynamic executable
And I noticed that during compilation the fPIC flag is used although
I removed every reference to it in all my Makefile.am files.
You are using libtool which works out sensible flags, and fPIC may be
such a flag, so it doesn't need to appear in your Makefile.am.
Maybe you could send us the output of "libtool --config" ?
Cheers,
Patrick
Ok, here you are some info about my environment and example project.
I'm building this project on this machine:
Linux office-007 2.6.38-11-generic #50-Ubuntu SMP Mon Sep 12 21:17:25
UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
This is my project structure:
hello_chap7/
|-- common
| |-- hellocommon.h
| |-- Makefile.am
| `-- print.cpp
|-- configure.ac
|-- include
| |-- libhello.h
| `-- Makefile.am
|-- libhello
| |-- hello_print.cpp
| `-- Makefile.am
|-- Makefile.am
`-- src
|-- hello.cpp
|-- Makefile.am
|-- module.h
`-- modules
`-- hithere
|-- hithere.cpp
`-- Makefile.am
These are my Makefile.am files inside the project:
hello_chap7/libhello/Makefile.am:
lib_LTLIBRARIES = libhello.la
libhello_la_SOURCES = hello_print.cpp
libhello_la_CPPFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/common
libhello_la_LIBADD = ../common/libhellocommon.la
#---
hello_chap7/src/modules/hithere/Makefile.am:
pkglib_LTLIBRARIES = hithere.la
hithere_la_SOURCES = hithere.cpp
hithere_la_LDFLAGS = -module -avoid-version
#---
hello_chap7/src/Makefile.am:
SUBDIRS = modules/hithere
bin_PROGRAMS = hello
hello_SOURCES = hello.cpp module.h
hello_CPPFLAGS = -I$(top_srcdir)/include
hello_LDADD = ../libhello/libhello.la -dlopen modules/hithere/hithere.la
check_SCRIPTS = greptest.sh
TESTS = $(check_SCRIPTS)
greptest.sh:
echo './hello | grep "Caneta says .* using program .*hello!"' >
greptest.sh
chmod +x greptest.sh
CLEANFILES = greptest.sh
#---
hello_chap7/include/Makefile.am:
include_HEADERS = libhello.h
#---
hello_chap7/common/Makefile.am:
noinst_LTLIBRARIES = libhellocommon.la
libhellocommon_la_SOURCES = hellocommon.h print.cpp
#---
hello_chap7/Makefile.am:
SUBDIRS = common include libhello src
#---
And in the end the libtool --config output:
macro_version=2.2.6b
macro_revision=1.3017
AS=as
DLLTOOL=dlltool
OBJDUMP=objdump
build_libtool_libs=yes
build_old_libs=yes
pic_mode=default
fast_install=yes
host_alias=
host=x86_64-pc-linux-gnu
host_os=linux-gnu
build_alias=x86_64-linux-gnu
build=x86_64-pc-linux-gnu
build_os=linux-gnu
SED="/bin/sed"
Xsed="$SED -e 1s/^X//"
GREP="/bin/grep"
EGREP="/bin/grep -E"
FGREP="/bin/grep -F"
NM="/usr/bin/nm -B"
LN_S="ln -s"
max_cmd_len=3458764513820540925
objext=o
exeext=
lt_unset=unset
SP2NL="tr \\040 \\012"
NL2SP="tr \\015\\012 \\040\\040"
reload_flag=" -r"
reload_cmds="\$LD\$reload_flag -o \$output\$reload_objs"
deplibs_check_method="pass_all"
file_magic_cmd="\$MAGIC_CMD"
AR="ar"
AR_FLAGS="cru"
STRIP="strip"
RANLIB="ranlib"
old_postinstall_cmds="chmod 644 \$oldlib~\$RANLIB \$oldlib"
old_postuninstall_cmds=""
LTCC="gcc"
LTCFLAGS="-Wall -g -O2"
global_symbol_pipe="sed -n -e 's/^.*[
]\\([ABCDGIRSTW][ABCDGIRSTW]*\\)[ ][
]*\\([_A-Za-z][_A-Za-z0-9]*\\)\$/\\1 \\2 \\2/p'"
global_symbol_to_cdecl="sed -n -e 's/^T .* \\(.*\\)\$/extern int
\\1();/p' -e 's/^[ABCDGIRSTW]* .* \\(.*\\)\$/extern char \\1;/p'"
global_symbol_to_c_name_address="sed -n -e 's/^: \\([^ ]*\\) \$/
{\\\"\\1\\\", (void *) 0},/p' -e 's/^[ABCDGIRSTW]* \\([^ ]*\\) \\([^
]*\\)\$/ {\"\\2\", (void *) \\&\\2},/p'"
global_symbol_to_c_name_address_lib_prefix="sed -n -e 's/^: \\([^ ]*\\)
\$/ {\\\"\\1\\\", (void *) 0},/p' -e 's/^[ABCDGIRSTW]* \\([^ ]*\\)
\\(lib[^ ]*\\)\$/ {\"\\2\", (void *) \\&\\2},/p' -e 's/^[ABCDGIRSTW]*
\\([^ ]*\\) \\([^ ]*\\)\$/ {\"lib\\2\", (void *) \\&\\2},/p'"
objdir=.libs
SHELL="/bin/bash"
ECHO="echo"
MAGIC_CMD=file
need_locks="no"
DSYMUTIL=""
NMEDIT=""
LIPO=""
OTOOL=""
OTOOL64=""
libext=a
shrext_cmds=".so"
extract_expsyms_cmds=""
variables_saved_for_relink="PATH LD_LIBRARY_PATH LD_RUN_PATH
GCC_EXEC_PREFIX COMPILER_PATH LIBRARY_PATH"
need_lib_prefix
