[PATCH] bindings: cxx: link using the libtool archives

[PATCH] bindings: cxx: link using the libtool archives

[orbea]

From: orbea <orbea@riseup.net>

When linking with internal dependencies that were built with libtool the
most reliable method is to use the libtool archive (.la) files.

When building with slibtool it fails when it doesn't find the -lgpiod
linker flag, but if libgpiod is already installed to the system it will
be built using the system version instead of the newly built libraries.

Gentoo issue: https://bugs.gentoo.org/913899

Signed-off-by: orbea <orbea@riseup.net>
---
 bindings/cxx/Makefile.am          | 2 +-
 bindings/cxx/examples/Makefile.am | 2 +-
 bindings/cxx/tests/Makefile.am    | 6 +++---
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/bindings/cxx/Makefile.am b/bindings/cxx/Makefile.am
index 1eafaa2..e2a89cf 100644
--- a/bindings/cxx/Makefile.am
+++ b/bindings/cxx/Makefile.am
@@ -24,8 +24,8 @@ libgpiodcxx_la_CXXFLAGS = -Wall -Wextra -g -std=gnu++17
 libgpiodcxx_la_CXXFLAGS += -fvisibility=hidden -I$(top_srcdir)/include/
 libgpiodcxx_la_CXXFLAGS += $(PROFILING_CFLAGS)
 libgpiodcxx_la_LDFLAGS = -version-info $(subst .,:,$(ABI_CXX_VERSION))
-libgpiodcxx_la_LDFLAGS += -lgpiod -L$(top_builddir)/lib
 libgpiodcxx_la_LDFLAGS += $(PROFILING_LDFLAGS)
+libgpiodcxx_la_LIBADD = $(top_builddir)/lib/libgpiod.la
 
 include_HEADERS = gpiod.hpp
 
diff --git a/bindings/cxx/examples/Makefile.am b/bindings/cxx/examples/Makefile.am
index 64ced20..eca4d64 100644
--- a/bindings/cxx/examples/Makefile.am
+++ b/bindings/cxx/examples/Makefile.am
@@ -3,7 +3,7 @@
 
 AM_CXXFLAGS = -I$(top_srcdir)/bindings/cxx/ -I$(top_srcdir)/include
 AM_CXXFLAGS += -Wall -Wextra -g -std=gnu++17
-AM_LDFLAGS = -lgpiodcxx -L$(top_builddir)/bindings/cxx/
+LDADD = $(top_builddir)/bindings/cxx/libgpiodcxx.la
 
 noinst_PROGRAMS = \
 	async_watch_line_value \
diff --git a/bindings/cxx/tests/Makefile.am b/bindings/cxx/tests/Makefile.am
index 02b5b6d..4d40d33 100644
--- a/bindings/cxx/tests/Makefile.am
+++ b/bindings/cxx/tests/Makefile.am
@@ -4,9 +4,9 @@
 AM_CXXFLAGS = -I$(top_srcdir)/bindings/cxx/ -I$(top_srcdir)/include
 AM_CXXFLAGS += -I$(top_srcdir)/tests/gpiosim/
 AM_CXXFLAGS += -Wall -Wextra -g -std=gnu++17 $(CATCH2_CFLAGS)
-AM_LDFLAGS = -lgpiodcxx -L$(top_builddir)/bindings/cxx/
-AM_LDFLAGS += -lgpiosim -L$(top_builddir)/tests/gpiosim/
-AM_LDFLAGS += -pthread
+AM_LDFLAGS = -pthread
+LDADD = $(top_builddir)/bindings/cxx/libgpiodcxx.la
+LDADD += $(top_builddir)/tests/gpiosim/libgiosim.la
 
 noinst_PROGRAMS = gpiod-cxx-test
 
-- 
2.43.2

Re: [PATCH] bindings: cxx: link using the libtool archives

[Bartosz Golaszewski]

On Wed, Mar 20, 2024 at 2:50 PM <orbea@riseup.net> wrote:
>
> From: orbea <orbea@riseup.net>
>
> When linking with internal dependencies that were built with libtool the
> most reliable method is to use the libtool archive (.la) files.
>
> When building with slibtool it fails when it doesn't find the -lgpiod
> linker flag, but if libgpiod is already installed to the system it will
> be built using the system version instead of the newly built libraries.
>
> Gentoo issue: https://bugs.gentoo.org/913899
>
> Signed-off-by: orbea <orbea@riseup.net>
> ---

Thanks,

Could you use your real name for the sake of code attribution (if we
need a license change later on or whatever)?

Bart

Re: [PATCH] bindings: cxx: link using the libtool archives

[orbea]

On Wed, 20 Mar 2024 16:18:38 +0100
Bartosz Golaszewski <brgl@bgdev.pl> wrote:

> On Wed, Mar 20, 2024 at 2:50 PM <orbea@riseup.net> wrote:
> >
> > From: orbea <orbea@riseup.net>
> >
> > When linking with internal dependencies that were built with
> > libtool the most reliable method is to use the libtool archive
> > (.la) files.
> >
> > When building with slibtool it fails when it doesn't find the
> > -lgpiod linker flag, but if libgpiod is already installed to the
> > system it will be built using the system version instead of the
> > newly built libraries.
> >
> > Gentoo issue: https://bugs.gentoo.org/913899
> >
> > Signed-off-by: orbea <orbea@riseup.net>
> > ---  
> 
> Thanks,
> 
> Could you use your real name for the sake of code attribution (if we
> need a license change later on or whatever)?
> 
> Bart

If its possible I would really prefer to not, my change is trivial and
I do not think it is significant enough to claim copyright.

So that I could easily link to it in the Gentoo issue I also made an
github PR which is gpg signed if that helps?

https://github.com/brgl/libgpiod/pull/65

Re: [PATCH] bindings: cxx: link using the libtool archives

[Bartosz Golaszewski]

On Wed, Mar 20, 2024 at 5:01 PM orbea <orbea@riseup.net> wrote:
>
> >
> > Thanks,
> >
> > Could you use your real name for the sake of code attribution (if we
> > need a license change later on or whatever)?
> >
> > Bart
>
> If its possible I would really prefer to not, my change is trivial and
> I do not think it is significant enough to claim copyright.
>
> So that I could easily link to it in the Gentoo issue I also made an
> github PR which is gpg signed if that helps?
>
> https://github.com/brgl/libgpiod/pull/65

Whatever, I guess it doesn't touch the code anyway.

Bart

Re: [PATCH] bindings: cxx: link using the libtool archives

[Bartosz Golaszewski]

On Wed, Mar 20, 2024 at 2:50 PM <orbea@riseup.net> wrote:
>
> From: orbea <orbea@riseup.net>
>
> When linking with internal dependencies that were built with libtool the
> most reliable method is to use the libtool archive (.la) files.
>
> When building with slibtool it fails when it doesn't find the -lgpiod
> linker flag, but if libgpiod is already installed to the system it will
> be built using the system version instead of the newly built libraries.
>
> Gentoo issue: https://bugs.gentoo.org/913899
>
> Signed-off-by: orbea <orbea@riseup.net>
> ---
>  bindings/cxx/Makefile.am          | 2 +-
>  bindings/cxx/examples/Makefile.am | 2 +-
>  bindings/cxx/tests/Makefile.am    | 6 +++---
>  3 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/bindings/cxx/Makefile.am b/bindings/cxx/Makefile.am
> index 1eafaa2..e2a89cf 100644
> --- a/bindings/cxx/Makefile.am
> +++ b/bindings/cxx/Makefile.am
> @@ -24,8 +24,8 @@ libgpiodcxx_la_CXXFLAGS = -Wall -Wextra -g -std=gnu++17
>  libgpiodcxx_la_CXXFLAGS += -fvisibility=hidden -I$(top_srcdir)/include/
>  libgpiodcxx_la_CXXFLAGS += $(PROFILING_CFLAGS)
>  libgpiodcxx_la_LDFLAGS = -version-info $(subst .,:,$(ABI_CXX_VERSION))
> -libgpiodcxx_la_LDFLAGS += -lgpiod -L$(top_builddir)/lib
>  libgpiodcxx_la_LDFLAGS += $(PROFILING_LDFLAGS)
> +libgpiodcxx_la_LIBADD = $(top_builddir)/lib/libgpiod.la
>
>  include_HEADERS = gpiod.hpp
>
> diff --git a/bindings/cxx/examples/Makefile.am b/bindings/cxx/examples/Makefile.am
> index 64ced20..eca4d64 100644
> --- a/bindings/cxx/examples/Makefile.am
> +++ b/bindings/cxx/examples/Makefile.am
> @@ -3,7 +3,7 @@
>
>  AM_CXXFLAGS = -I$(top_srcdir)/bindings/cxx/ -I$(top_srcdir)/include
>  AM_CXXFLAGS += -Wall -Wextra -g -std=gnu++17
> -AM_LDFLAGS = -lgpiodcxx -L$(top_builddir)/bindings/cxx/
> +LDADD = $(top_builddir)/bindings/cxx/libgpiodcxx.la
>
>  noinst_PROGRAMS = \
>         async_watch_line_value \
> diff --git a/bindings/cxx/tests/Makefile.am b/bindings/cxx/tests/Makefile.am
> index 02b5b6d..4d40d33 100644
> --- a/bindings/cxx/tests/Makefile.am
> +++ b/bindings/cxx/tests/Makefile.am
> @@ -4,9 +4,9 @@
>  AM_CXXFLAGS = -I$(top_srcdir)/bindings/cxx/ -I$(top_srcdir)/include
>  AM_CXXFLAGS += -I$(top_srcdir)/tests/gpiosim/
>  AM_CXXFLAGS += -Wall -Wextra -g -std=gnu++17 $(CATCH2_CFLAGS)
> -AM_LDFLAGS = -lgpiodcxx -L$(top_builddir)/bindings/cxx/
> -AM_LDFLAGS += -lgpiosim -L$(top_builddir)/tests/gpiosim/
> -AM_LDFLAGS += -pthread
> +AM_LDFLAGS = -pthread
> +LDADD = $(top_builddir)/bindings/cxx/libgpiodcxx.la
> +LDADD += $(top_builddir)/tests/gpiosim/libgiosim.la

Please test your changes, this is a typo and it doesn't build. It
should have been "libgpiosim".

I fixed it up when applying.

Thanks,
Bartosz

>
>  noinst_PROGRAMS = gpiod-cxx-test
>
> --
> 2.43.2
>
>

Re: [PATCH] bindings: cxx: link using the libtool archives

[orbea]

On Wed, 20 Mar 2024 17:43:46 +0100
Bartosz Golaszewski <brgl@bgdev.pl> wrote:

> On Wed, Mar 20, 2024 at 2:50 PM <orbea@riseup.net> wrote:
> >
> > From: orbea <orbea@riseup.net>
> >
> > When linking with internal dependencies that were built with
> > libtool the most reliable method is to use the libtool archive
> > (.la) files.
> >
> > When building with slibtool it fails when it doesn't find the
> > -lgpiod linker flag, but if libgpiod is already installed to the
> > system it will be built using the system version instead of the
> > newly built libraries.
> >
> > Gentoo issue: https://bugs.gentoo.org/913899
> >
> > Signed-off-by: orbea <orbea@riseup.net>
> > ---
> >  bindings/cxx/Makefile.am          | 2 +-
> >  bindings/cxx/examples/Makefile.am | 2 +-
> >  bindings/cxx/tests/Makefile.am    | 6 +++---
> >  3 files changed, 5 insertions(+), 5 deletions(-)
> >
> > diff --git a/bindings/cxx/Makefile.am b/bindings/cxx/Makefile.am
> > index 1eafaa2..e2a89cf 100644
> > --- a/bindings/cxx/Makefile.am
> > +++ b/bindings/cxx/Makefile.am
> > @@ -24,8 +24,8 @@ libgpiodcxx_la_CXXFLAGS = -Wall -Wextra -g
> > -std=gnu++17 libgpiodcxx_la_CXXFLAGS += -fvisibility=hidden
> > -I$(top_srcdir)/include/ libgpiodcxx_la_CXXFLAGS +=
> > $(PROFILING_CFLAGS) libgpiodcxx_la_LDFLAGS = -version-info $(subst
> > .,:,$(ABI_CXX_VERSION)) -libgpiodcxx_la_LDFLAGS += -lgpiod
> > -L$(top_builddir)/lib libgpiodcxx_la_LDFLAGS += $(PROFILING_LDFLAGS)
> > +libgpiodcxx_la_LIBADD = $(top_builddir)/lib/libgpiod.la
> >
> >  include_HEADERS = gpiod.hpp
> >
> > diff --git a/bindings/cxx/examples/Makefile.am
> > b/bindings/cxx/examples/Makefile.am index 64ced20..eca4d64 100644
> > --- a/bindings/cxx/examples/Makefile.am
> > +++ b/bindings/cxx/examples/Makefile.am
> > @@ -3,7 +3,7 @@
> >
> >  AM_CXXFLAGS = -I$(top_srcdir)/bindings/cxx/ -I$(top_srcdir)/include
> >  AM_CXXFLAGS += -Wall -Wextra -g -std=gnu++17
> > -AM_LDFLAGS = -lgpiodcxx -L$(top_builddir)/bindings/cxx/
> > +LDADD = $(top_builddir)/bindings/cxx/libgpiodcxx.la
> >
> >  noinst_PROGRAMS = \
> >         async_watch_line_value \
> > diff --git a/bindings/cxx/tests/Makefile.am
> > b/bindings/cxx/tests/Makefile.am index 02b5b6d..4d40d33 100644
> > --- a/bindings/cxx/tests/Makefile.am
> > +++ b/bindings/cxx/tests/Makefile.am
> > @@ -4,9 +4,9 @@
> >  AM_CXXFLAGS = -I$(top_srcdir)/bindings/cxx/ -I$(top_srcdir)/include
> >  AM_CXXFLAGS += -I$(top_srcdir)/tests/gpiosim/
> >  AM_CXXFLAGS += -Wall -Wextra -g -std=gnu++17 $(CATCH2_CFLAGS)
> > -AM_LDFLAGS = -lgpiodcxx -L$(top_builddir)/bindings/cxx/
> > -AM_LDFLAGS += -lgpiosim -L$(top_builddir)/tests/gpiosim/
> > -AM_LDFLAGS += -pthread
> > +AM_LDFLAGS = -pthread
> > +LDADD = $(top_builddir)/bindings/cxx/libgpiodcxx.la
> > +LDADD += $(top_builddir)/tests/gpiosim/libgiosim.la  
> 
> Please test your changes, this is a typo and it doesn't build. It
> should have been "libgpiosim".
> 
> I fixed it up when applying.
> 
> Thanks,
> Bartosz
> 
> >
> >  noinst_PROGRAMS = gpiod-cxx-test
> >
> > --
> > 2.43.2
> >
> >  

Thank you and apologies, I neglected to mention that I was having a
hard time getting the tests to build because the check2 in Gentoo
doesn't seem compatible with what you expect. Maybe its too new?

(Sending this twice because I forgot to CC the list)

Re: [PATCH] bindings: cxx: link using the libtool archives

[Bartosz Golaszewski]

On Thu, Mar 21, 2024 at 2:34 PM orbea <orbea@riseup.net> wrote:
>
> Thank you and apologies, I neglected to mention that I was having a
> hard time getting the tests to build because the check2 in Gentoo
> doesn't seem compatible with what you expect. Maybe its too new?
>

I suppose you mean Catch2? What version does Gentoo provide?

Bart