The GNU make parallel jobs flgs (-j or --jobs) can significantly (~30%) improve the edk2 build time in Linux.
This patch enable the GNU make parallel jobs by default.
Below the OVMF test result on GCC5 and CLANGPDB toolchains:

GCC5 build without patch:
jshi19@ub2-uefi-b01:~/wksp_efi/edk2-2$ time build -p OvmfPkg/OvmfPkgIa32X64.dsc -a IA32 -a X64 -t GCC5 -DSECURE_BOOT_ENABLE=TRUE
real    0m58.784s
user    5m18.820s
sys     0m46.337s
GCC5 build with patch:
jshi19@ub2-uefi-b01:~/wksp_efi/edk2-2$ time build -p OvmfPkg/OvmfPkgIa32X64.dsc -a IA32 -a X64 -t GCC5 -DSECURE_BOOT_ENABLE=TRUE
real    0m41.547s
user    5m23.617s
sys     0m47.397s

GCC5 build time improved by +29%

CLANGPDB build without patch:
jshi19@ub2-uefi-b01:~/wksp_efi/edk2-2$ time build -p OvmfPkg/OvmfPkgIa32X64.dsc -a IA32 -a X64 -t CLANGPDB -DSECURE_BOOT_ENABLE=TRUE
real    1m4.162s
user    4m15.025s
sys     0m30.480s

CLANGPDB build with patch:
jshi19@ub2-uefi-b01:~/wksp_efi/edk2-2$ time build -p OvmfPkg/OvmfPkgIa32X64.dsc -a IA32 -a X64 -t CLANGPDB -DSECURE_BOOT_ENABLE=TRUE
real    0m31.307s
user    4m21.952s
sys     0m30.641s
CLANGPDB build time improved by +51%


Steven Shi (1):
  BaseTools: Enable GNU make parallel jobs by default

 BaseTools/Conf/tools_def.template                  |  4 ++++
 BaseTools/Source/Python/AutoGen/GenMake.py         |  5 +++--
 BaseTools/Source/Python/AutoGen/PlatformAutoGen.py | 12 +++++++++++-
 3 files changed, 18 insertions(+), 3 deletions(-)

-- 
2.22.0.windows.1



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