[PATCH v2] build: Use AC_HEADER_MAJOR to find device macros

[Mike Gilbert]

Depending on the OS/libc, device macros are defined in different
headers.

sys/mkdev.h - BSD, Sun
sys/sysmacros.h - glibc (Linux)

glibc currently pulls sys/sysmacros.h into sys/types.h, but this may
change in a future release.

https://sourceware.org/ml/libc-alpha/2015-11/msg00253.html
---
 configure.ac                         | 3 ++-
 grub-core/osdep/devmapper/getroot.c  | 6 ++++++
 grub-core/osdep/devmapper/hostdisk.c | 5 +++++
 grub-core/osdep/linux/getroot.c      | 6 ++++++
 grub-core/osdep/unix/getroot.c       | 4 +++-
 5 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 57e1713..9ddfc53 100644
--- a/configure.ac
+++ b/configure.ac
@@ -388,7 +388,8 @@ fi
 
 # Check for functions and headers.
 AC_CHECK_FUNCS(posix_memalign memalign getextmntent)
-AC_CHECK_HEADERS(sys/param.h sys/mount.h sys/mnttab.h sys/mkdev.h limits.h)
+AC_CHECK_HEADERS(sys/param.h sys/mount.h sys/mnttab.h limits.h)
+AC_HEADER_MAJOR
 
 AC_CHECK_MEMBERS([struct statfs.f_fstypename],,,[$ac_includes_default
 #include <sys/param.h>
diff --git a/grub-core/osdep/devmapper/getroot.c 
b/grub-core/osdep/devmapper/getroot.c
index 05eda50..72e5582 100644
--- a/grub-core/osdep/devmapper/getroot.c
+++ b/grub-core/osdep/devmapper/getroot.c
@@ -40,6 +40,12 @@
 #include <limits.h>
 #endif
 
+#if defined(MAJOR_IN_MKDEV)
+#include <sys/mkdev.h>
+#elif defined(MAJOR_IN_SYSMACROS)
+#include <sys/sysmacros.h>
+#endif
+
 #include <libdevmapper.h>
 
 #include <grub/types.h>
diff --git a/grub-core/osdep/devmapper/hostdisk.c 
b/grub-core/osdep/devmapper/hostdisk.c
index 19c1101..a697bcb 100644
--- a/grub-core/osdep/devmapper/hostdisk.c
+++ b/grub-core/osdep/devmapper/hostdisk.c
@@ -24,6 +24,11 @@
 #include <errno.h>
 #include <limits.h>
 
+#if defined(MAJOR_IN_MKDEV)
+#include <sys/mkdev.h>
+#elif defined(MAJOR_IN_SYSMACROS)
+#include <sys/sysmacros.h>
+#endif
 
 #ifdef HAVE_DEVICE_MAPPER
 # include <libdevmapper.h>
diff --git a/grub-core/osdep/linux/getroot.c b/grub-core/osdep/linux/getroot.c
index 10480b6..09e7e6e 100644
--- a/grub-core/osdep/linux/getroot.c
+++ b/grub-core/osdep/linux/getroot.c
@@ -35,6 +35,12 @@
 #include <limits.h>
 #endif
 
+#if defined(MAJOR_IN_MKDEV)
+#include <sys/mkdev.h>
+#elif defined(MAJOR_IN_SYSMACROS)
+#include <sys/sysmacros.h>
+#endif
+
 #include <grub/types.h>
 #include <sys/ioctl.h>         /* ioctl */
 #include <sys/mount.h>
diff --git a/grub-core/osdep/unix/getroot.c b/grub-core/osdep/unix/getroot.c
index 1079a91..4bf37b0 100644
--- a/grub-core/osdep/unix/getroot.c
+++ b/grub-core/osdep/unix/getroot.c
@@ -51,8 +51,10 @@
 #endif
 
 #include <sys/types.h>
-#if defined(HAVE_SYS_MKDEV_H)
+#if defined(MAJOR_IN_MKDEV)
 #include <sys/mkdev.h>
+#elif defined(MAJOR_IN_SYSMACROS)
+#include <sys/sysmacros.h>
 #endif
 
 #if defined(HAVE_LIBZFS) && defined(HAVE_LIBNVPAIR)
-- 
2.8.1