[Libguestfs] [PATCH] customize: Use libxcrypt if available to provide crypt(3).

[Richard W.M. Jones]

glibc 2.27 removes crypt(3) and suggests using libxcrypt.
libxcrypt requires <crypt.h> to be included.
---
 customize/Makefile.am        |  1 +
 customize/crypt-c.c          |  4 ++++
 m4/guestfs-misc-libraries.m4 | 27 +++++++++++++++++++--------
 3 files changed, 24 insertions(+), 8 deletions(-)

diff --git a/customize/Makefile.am b/customize/Makefile.am
index b4ec9286a..a22e25c46 100644
--- a/customize/Makefile.am
+++ b/customize/Makefile.am
@@ -100,6 +100,7 @@ libcustomize_a_CPPFLAGS = \
 	-I$(top_srcdir)/common/edit
 libcustomize_a_CFLAGS = \
 	$(WARN_CFLAGS) $(WERROR_CFLAGS) \
+	$(LIBCRYPT_CFLAGS) \
 	$(LIBVIRT_CFLAGS) \
 	$(LIBXML2_CFLAGS) \
 	-fPIC
diff --git a/customize/crypt-c.c b/customize/crypt-c.c
index 70e6ea7f5..d5425cfaa 100644
--- a/customize/crypt-c.c
+++ b/customize/crypt-c.c
@@ -22,6 +22,10 @@
 #include <stdlib.h>
 #include <unistd.h>
 
+#if HAVE_CRYPT_H
+#include <crypt.h>
+#endif
+
 #include <caml/alloc.h>
 #include <caml/memory.h>
 #include <caml/mlvalues.h>
diff --git a/m4/guestfs-misc-libraries.m4 b/m4/guestfs-misc-libraries.m4
index 2f371873f..f05a56fb8 100644
--- a/m4/guestfs-misc-libraries.m4
+++ b/m4/guestfs-misc-libraries.m4
@@ -17,14 +17,25 @@
 
 dnl Miscellaneous libraries used by other programs.
 
-dnl Check if crypt() is provided by a separate library.
-old_LIBS="$LIBS"
-AC_SEARCH_LIBS([crypt],[crypt])
-LIBS="$old_LIBS"
-if test "$ac_cv_search_crypt" = "-lcrypt" ; then
-  LIBCRYPT_LIBS="-lcrypt"
-fi
-AC_SUBST([LIBCRYPT_LIBS])
+dnl glibc 2.27 removes crypt(3) and suggests using libxcrypt.
+PKG_CHECK_MODULES([LIBCRYPT], [libxcrypt], [
+    AC_SUBST([LIBCRYPT_CFLAGS])
+    AC_SUBST([LIBCRYPT_LIBS])
+],[
+    dnl Check if crypt() is provided by another library.
+    old_LIBS="$LIBS"
+    AC_SEARCH_LIBS([crypt],[crypt])
+    LIBS="$old_LIBS"
+    if test "$ac_cv_search_crypt" = "-lcrypt" ; then
+        LIBCRYPT_LIBS="-lcrypt"
+    fi
+    AC_SUBST([LIBCRYPT_LIBS])
+])
+
+dnl Do we need to include <crypt.h>?
+old_CFLAGS="$CFLAGS"
+AC_CHECK_HEADERS([crypt.h])
+CFLAGS="$old_CFLAGS"
 
 dnl liblzma can be used by virt-builder (optional).
 PKG_CHECK_MODULES([LIBLZMA], [liblzma], [
-- 
2.13.2