[Qemu-devel] [PATCH] roms/edk2-build.sh: Allow to run edk2-build.sh from command line

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

The edk2-build.sh script set the 'nounset' option:

  BASH(1)

  set [arg ...]

      -u   Treat unset variables and parameters other than the
           special parameters "@" and "*" as an error when
           performing parameter expansion.  If expansion is
           attempted on an unset variable or parameter, the shell
           prints an error message, and, if not interactive,
           exits with a non-zero status.

When running this script out of 'make', we get:

  $ cd roms
  $ ./edk2-build.sh aarch64 --arch=AARCH64 --platform=ArmVirtPkg/ArmVirtQemu.dsc > /dev/null
  ./edk2-build.sh: line 46: MAKEFLAGS: unbound variable

Fix this by checking the variable is defined before using it,
else use a default value.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 roms/edk2-build.sh | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/roms/edk2-build.sh b/roms/edk2-build.sh
index 4f46f8a6a2..5390228b4e 100755
--- a/roms/edk2-build.sh
+++ b/roms/edk2-build.sh
@@ -43,7 +43,13 @@ fi
 # any), for the edk2 "build" utility.
 source ../edk2-funcs.sh
 edk2_toolchain=$(qemu_edk2_get_toolchain "$emulation_target")
-edk2_thread_count=$(qemu_edk2_get_thread_count "$MAKEFLAGS")
+if [ -v MAKEFLAGS ]; then
+  edk2_thread_count=$(qemu_edk2_get_thread_count "$MAKEFLAGS")
+else
+  # We are not running within 'make', let the edk2 "build" utility to fetch
+  # the logical CPU count with Python's multiprocessing.cpu_count() method.
+  edk2_thread_count=0
+fi
 qemu_edk2_set_cross_env "$emulation_target"
 
 # Build the platform firmware.
-- 
2.20.1