Find fts-standalone on musl

  Bug: https://bugs.gentoo.org/831571
---
 configure.ac      | 7 +++++++
 src/Makefile.am   | 4 ++--
 tools/Makefile.am | 3 ++-
 tools/abisym.cc   | 1 +
 tools/kmidiff.cc  | 1 -
 5 files changed, 12 insertions(+), 4 deletions(-)
  

On Sat, 2022-01-29 at 20:31 +0100, David Seifert wrote:
> Bug: https://bugs.gentoo.org/831571
> ---
>  configure.ac      | 7 +++++++
>  src/Makefile.am   | 4 ++--
>  tools/Makefile.am | 3 ++-
>  tools/abisym.cc   | 1 +
>  tools/kmidiff.cc  | 1 -
>  5 files changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/configure.ac b/configure.ac
> index 29130175..019bdbac 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -161,6 +161,7 @@ dnl check for dependencies
>  dnl *************************************************
>  
>  AC_PROG_CXX
> +AC_CANONICAL_HOST
>  AC_USE_SYSTEM_EXTENSIONS
>  AC_PROG_INSTALL
>  
> @@ -219,6 +220,12 @@ AS_IF([test "x$ac_cv_bad_fts" = "xyes"],
>        [CFLAGS="$CFLAGS -DBAD_FTS=1",
>         CXXFLAGS="$CXXFLAGS -DBAD_FTS=1"])
>  
> +dnl On musl, we need to find fts-standalone
> +AS_CASE(
> +  [${host_os}], [*-musl*], [
> +    PKG_CHECK_MODULES([FTS], [fts-standalone])
> +])
> +
>  dnl Check for dependency: libelf, libdw, libebl (elfutils)
>  dnl Note that we need to use at least elfutils 0.159 but
>  dnl at that time elfutils didnt have pkgconfig capabilities
> diff --git a/src/Makefile.am b/src/Makefile.am
> index 29da1ecf..1591224f 100644
> --- a/src/Makefile.am
> +++ b/src/Makefile.am
> @@ -46,12 +46,12 @@ if CTF_READER
>  libabigail_la_SOURCES += abg-ctf-reader.cc
>  endif
>  
> -libabigail_la_LIBADD = $(DEPS_LIBS)
> +libabigail_la_LIBADD = $(DEPS_LIBS) $(FTS_LIBS)
>  libabigail_la_LDFLAGS = -lpthread -Wl,--as-needed -no-undefined
>  
>  CUSTOM_MACROS = -DABIGAIL_ROOT_SYSTEM_LIBDIR=\"${libdir}\"
>  
>  AM_CPPFLAGS=\
> -$(CUSTOM_MACROS) $(DEPS_CPPFLAGS) \
> +$(CUSTOM_MACROS) $(DEPS_CPPFLAGS) $(FTS_CFLAGS) \
>  -Wall -I$(abs_top_srcdir) -I$(abs_top_srcdir)/include \
>  -I$(abs_top_builddir)/include -I$(abs_top_builddir)
> diff --git a/tools/Makefile.am b/tools/Makefile.am
> index 648a71b5..f7592b60 100644
> --- a/tools/Makefile.am
> +++ b/tools/Makefile.am
> @@ -37,7 +37,8 @@ abicompat_LDADD =
> $(abs_top_builddir)/src/libabigail.la
>  
>  abipkgdiff_SOURCES = abipkgdiff.cc
>  abipkgdiffdir = $(bindir)
> -abipkgdiff_LDADD = $(abs_top_builddir)/src/libabigail.la
> +abipkgdiff_CPPFLAGS = $(FTS_CFLAGS)
> +abipkgdiff_LDADD = $(abs_top_builddir)/src/libabigail.la $(FTS_LIBS)
>  abipkgdiff_LDFLAGS = -pthread
>  
>  kmidiff_SOURCES = kmidiff.cc
> diff --git a/tools/abisym.cc b/tools/abisym.cc
> index a8fe19cd..a105e4ff 100644
> --- a/tools/abisym.cc
> +++ b/tools/abisym.cc
> @@ -12,6 +12,7 @@
>  
>  #include <libgen.h>
>  #include <elf.h>
> +#include <libgen.h>
>  #include <cstring>
>  #include <iostream>
>  #include <sstream>

Ignore this hunk; my patch derives from a local patch in Gentoo applied
to the git tree, which I hadn't double-checked (069ead6b).

> diff --git a/tools/kmidiff.cc b/tools/kmidiff.cc
> index b802348f..2e88baa7 100644
> --- a/tools/kmidiff.cc
> +++ b/tools/kmidiff.cc
> @@ -11,7 +11,6 @@
>  
>  #include <sys/types.h>
>  #include <dirent.h>
> -#include <fts.h>
>  #include <cstring>
>  #include <string>
>  #include <vector>
  

Hello David,

David Seifert via Libabigail <libabigail@sourceware.org> a écrit:

> Bug: https://bugs.gentoo.org/831571
> ---
>  configure.ac      | 7 +++++++
>  src/Makefile.am   | 4 ++--
>  tools/Makefile.am | 3 ++-
>  tools/abisym.cc   | 1 +
>  tools/kmidiff.cc  | 1 -
>  5 files changed, 12 insertions(+), 4 deletions(-)

Thank you for this patch!

I have amended it a little to make its commit log part comply with the
project's standard described at in the COMMIT-LOG-GUIDELINES file in the
source tree, which can be browsed online at
https://sourceware.org/git/?p=libabigail.git;a=blob_plain;f=COMMIT-LOG-GUIDELINES.


You'll find the patch attached bellow.

Also, as described at line 284 of the CONTRIBUTING file in the source
tree, which can be browsed online at
https://sourceware.org/git/?p=libabigail.git;a=blob;f=CONTRIBUTING;hb=HEAD#l284,
I need you to write a

    signed-off-by Daved Seifert <your-email-address>

In reply to the patch below so that I can add it to the git repository.


So here is the patch from you (modulo the signed-off-by that I still
need from you) that I propose to apply to the git repository.

Is that OK?

Thanks.

From f685aedb92e7b6a31ccf26791f61304f26f2dab1 Mon Sep 17 00:00:00 2001
From: David Seifert <soap@gentoo.org>
Date: Sat, 29 Jan 2022 20:31:07 +0100
Subject: [PATCH] Find fts-standalone on musl

When using the musl C library fts is optional.  So we need to detect
its presence by looking at the fts-standalone pkgconfig module.

This patch does that.

This comes from Gentoo bug https://bugs.gentoo.org/831571

	* configure.ac: Invoke AC_CANONICAL_HOST to compute the host_cpu,
	host_vendor, host_os parts of the 'host" variable.  Then if the
	host_os ends up with "musl" then, check for the fts-standalone
	pkgconfig module and record the fts library into
	FTS_{LIBS,CFLAGS}.
	* src/Makefile.am: Link to $FTS_LIBS and use $FTS_CFLAGS for
	compilation.
	* tools/Makefile.am: Likewise.
	* tools/abisym.cc: Include libgen.h
	* tools/kmidiff.cc: Remove useless fts.h header file.

Signed-off-by: Dodji Seketeli <dodji@redhat.com>
---
 configure.ac      | 7 +++++++
 src/Makefile.am   | 4 ++--
 tools/Makefile.am | 3 ++-
 tools/kmidiff.cc  | 1 -
 4 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index 29130175..019bdbac 100644
--- a/configure.ac
+++ b/configure.ac
@@ -161,6 +161,7 @@ dnl check for dependencies
 dnl *************************************************
 
 AC_PROG_CXX
+AC_CANONICAL_HOST
 AC_USE_SYSTEM_EXTENSIONS
 AC_PROG_INSTALL
 
@@ -219,6 +220,12 @@ AS_IF([test "x$ac_cv_bad_fts" = "xyes"],
       [CFLAGS="$CFLAGS -DBAD_FTS=1",
        CXXFLAGS="$CXXFLAGS -DBAD_FTS=1"])
 
+dnl On musl, we need to find fts-standalone
+AS_CASE(
+  [${host_os}], [*-musl*], [
+    PKG_CHECK_MODULES([FTS], [fts-standalone])
+])
+
 dnl Check for dependency: libelf, libdw, libebl (elfutils)
 dnl Note that we need to use at least elfutils 0.159 but
 dnl at that time elfutils didnt have pkgconfig capabilities
diff --git a/src/Makefile.am b/src/Makefile.am
index 29da1ecf..1591224f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -46,12 +46,12 @@ if CTF_READER
 libabigail_la_SOURCES += abg-ctf-reader.cc
 endif
 
-libabigail_la_LIBADD = $(DEPS_LIBS)
+libabigail_la_LIBADD = $(DEPS_LIBS) $(FTS_LIBS)
 libabigail_la_LDFLAGS = -lpthread -Wl,--as-needed -no-undefined
 
 CUSTOM_MACROS = -DABIGAIL_ROOT_SYSTEM_LIBDIR=\"${libdir}\"
 
 AM_CPPFLAGS=\
-$(CUSTOM_MACROS) $(DEPS_CPPFLAGS) \
+$(CUSTOM_MACROS) $(DEPS_CPPFLAGS) $(FTS_CFLAGS) \
 -Wall -I$(abs_top_srcdir) -I$(abs_top_srcdir)/include \
 -I$(abs_top_builddir)/include -I$(abs_top_builddir)
diff --git a/tools/Makefile.am b/tools/Makefile.am
index 648a71b5..f7592b60 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -37,7 +37,8 @@ abicompat_LDADD = $(abs_top_builddir)/src/libabigail.la
 
 abipkgdiff_SOURCES = abipkgdiff.cc
 abipkgdiffdir = $(bindir)
-abipkgdiff_LDADD = $(abs_top_builddir)/src/libabigail.la
+abipkgdiff_CPPFLAGS = $(FTS_CFLAGS)
+abipkgdiff_LDADD = $(abs_top_builddir)/src/libabigail.la $(FTS_LIBS)
 abipkgdiff_LDFLAGS = -pthread
 
 kmidiff_SOURCES = kmidiff.cc
diff --git a/tools/kmidiff.cc b/tools/kmidiff.cc
index b802348f..2e88baa7 100644
--- a/tools/kmidiff.cc
+++ b/tools/kmidiff.cc
@@ -11,7 +11,6 @@
 
 #include <sys/types.h>
 #include <dirent.h>
-#include <fts.h>
 #include <cstring>
 #include <string>
 #include <vector>