[xen staging] tools/firmware: Build firmware as -ffreestanding

[patchbot@xxxxxxx]

commit 0eae016b6e3dce69e3fb86aca5c4f221591a2f12
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Feb 25 19:15:08 2021 +0000
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon Mar 1 23:19:39 2021 +0000

    tools/firmware: Build firmware as -ffreestanding
    
    firmware should always have been -ffreestanding, as it doesn't execute in 
the
    host environment.  -ffreestanding implies -fno-builtin, so replace the 
option.
    
    inttypes.h isn't a freestanding header, but the 32bitbios_support.c only 
wants
    the stdint.h types so switch to the more appropriate include.
    
    This removes the build time dependency on a 32bit libc just to compile the
    hvmloader and friends.
    
    Update README and the TravisCI configuration.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
    Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx>
---
 .travis.yml                                  | 1 -
 README                                       | 3 ---
 tools/firmware/Rules.mk                      | 2 +-
 tools/firmware/hvmloader/32bitbios_support.c | 2 +-
 4 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 15ca9e9047..2362475f7a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -58,7 +58,6 @@ addons:
             - acpica-tools
             - bin86
             - bcc
-            - libc6-dev-i386
             - libnl-3-dev
             - ocaml-nox
             - libfindlib-ocaml-dev
diff --git a/README b/README
index 6e15242ae1..8c99c30986 100644
--- a/README
+++ b/README
@@ -62,9 +62,6 @@ provided by your OS distributor:
     * GNU bison and GNU flex
     * GNU gettext
     * ACPI ASL compiler (iasl)
-    * Libc multiarch package (e.g. libc6-dev-i386 / glibc-devel.i686).
-      Required when building on a 64-bit platform to build
-      32-bit components which are enabled on a default build.
 
 In addition to the above there are a number of optional build
 prerequisites. Omitting these will cause the related features to be
diff --git a/tools/firmware/Rules.mk b/tools/firmware/Rules.mk
index 26bbddccd4..dc372a86d8 100644
--- a/tools/firmware/Rules.mk
+++ b/tools/firmware/Rules.mk
@@ -16,4 +16,4 @@ CFLAGS += -Werror
 $(call cc-options-add,CFLAGS,CC,$(EMBEDDED_EXTRA_CFLAGS))
 
 # Extra CFLAGS suitable for an embedded type of environment.
-CFLAGS += -fno-builtin -msoft-float
+CFLAGS += -ffreestanding -msoft-float
diff --git a/tools/firmware/hvmloader/32bitbios_support.c 
b/tools/firmware/hvmloader/32bitbios_support.c
index 6f28fb6bde..cee3804888 100644
--- a/tools/firmware/hvmloader/32bitbios_support.c
+++ b/tools/firmware/hvmloader/32bitbios_support.c
@@ -20,7 +20,7 @@
  * this program; If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <inttypes.h>
+#include <stdint.h>
 #include <xen/libelf/elfstructs.h>
 
 #include "util.h"
--
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