Appendix K Third Party Tool Flags
The following tables provide a summary of these "Best Known" options.
Note: A reserved keyword, MDEPKG_NDEBUG, can be used for code size reduction purposes.

Table 24 Standard C File Compiler Options

Microsoft
Intel
GCC
Description
/nologo
/nologo
Do not display compiler version information
/c
/c
-c
Compile C files to object (.obj) files only, do not link
/WX
/WX
-Werror
Force warnings to be reported as errors.
/GS-
/GS-
Disable security checks
-Wno-missing-braces
Warn if an aggregate or union initializer is not fully bracketed. In the following example, the initializer for 'a' is not fully bracketed, but that for 'b' is fully bracketed.
-Wno-array-bounds
Disables warnings if subscripts to arrays are out of bounds.
/W4
/W4
-Wall
Warning level 4 - print errors, warnings and remarks (or enable most warning messages)
/Gs32768
Control stack (32768 bytes) checking calls
/Gy
/Gy
Separate functions for linker.
/O1ib2
/O1
Optimize for minimum space, enable intrinsic functions, enable in-line expansion.
/Oi
Enable Intrinsic functions
/Ob2
-default-inline
In-line any function, at the compiler's discretion (same as /Qip)
-O
Optimize output file
/GL
Enable link-time code generation
/EHs-c-
Combine /EHs- and /EHc-
/EHs-
Disable C++ EH (no SHE exceptions)
/EHc-
Disable extern C defaults to no throw
/GF
GF
Enable read-only string pooling
/GR-
Disable C++ RTTI
EDK II Specific Flags
/D UNICODE
/D UNICODE
-DUNICODE
define macro UNICODE
/FIAutoGen.h
/FIAutoGen.h
--include AutoGen.h
Always include AutoGen.h file
Debug Specific Flags
/Zi
/Zi
-g
Enable debugging information
/Gm
/Gm
Enable minimum rebuild
-fshort-wchar
Force the underlying type for "wchar_t" to be "unsigned short"
-fno-stack-protector
-fno-strict-aliasing
-ffunction-sections
-fdata-sections
IPF Specific Flags
/Ox
Maximum Optimization (/Ogityb2 /Gs)
/X
ignore standard places
/QIPF_fr32
Do not use upper 96 Floating Point Registers
/Zx
Generates debug-able optimized code. Only available in the IPF cross compiler or IPF native compiler.

Table 25 Assembly Flags

Microsoft
GCC
Description
/nologo
Do not display assembler version information
/c
-c
Generate object (.obj) files, do not link
/WX
Treat warnings as errors
/W3
Warning level 3
/Cx
Preserve case in publics and externs
/coff
Generate COFF format object files
/Zd
Add line number debug info
/Zi
Add symbolic debug info (DEBUG target)
-x assembler
Input files are in assembly language
-imacros AutoGen.h
Accept definition of macros in AutoGen.h

Table 26 C Compiler's Preprocessor Options

Microsoft
Intel
GCC
Description
/nologo
/nologo
Do not display compiler version information
/E
/E
-E
Preprocess only; do not compile, assemble or link
/TC
/TC
-x assembler-with-cpp
Compile as .c files
/FIAutoGen.h
/FIAutoGen.h
--include AutoGen.h
Always include AutoGen.h file

Table 27 C Compiler's Preprocessor Options for VFR files ONLY

Microsoft
Intel
GCC
Description
/nologo
/nologo
Do not display compiler version information
/E
/E
-E
Preprocess only; do not compile, assemble or link
/TC
/TC
-x c
Compile as .c files
/D VFRCOMPILE
/D VFRCOMPILE
-DVFRCOMPILE
Used only for Preprocessing VFR files
-P
Used only for Preprocessing VFR files - do not generate #line directives
/FI$(MOD_NAME)StrDefs.h
Force include of the module's StrDefs.h file.

Table 28 Pre-compiled Header (PCH) Creation Flags

Microsoft
Intel
GCC
Description
/nologo
/nologo
Do not display compiler version information
/c
/c
-c
Compile C files to object (.obj) files only, do not link
/W4
/W4
-Wall
Warning level 4 - print errors, warnings and remarks (or enable most warning messages)
/WX
/WX
-Werror
Force warnings to be reported as errors.
/Gy
/Gy
Separate functions for linker.
/GS-
/GS-
Disable security checks
/O1
/O1
Optimize for Maximum Speed
/Oi
/Oi
Enable Intrinsic functions
/Ob2
/Ob2
-default-inline
In-line any function, at the compiler's discretion (same as /Qip)
/GL
Enable link-time code generation
/EHs-
/EHs-
Disable C++ EH (no SHE exceptions)
/EHc-
/EHc-
Disable extern C defaults to no throw
/GF
/GF
Enable read-only string pooling
/Gs8192
/Gs8192
Control stack (8192 bytes) checking calls
/TC
/TC
Compile as .c files
/Yc
Create the .pch file
/Gm
Enable minimal rebuilds
/FpAutoGen.h.gch
/X
/X
Ignore standard places
/Zi
/Zi
Produce debugging information

Table 29 Static Linker Flags

Microsoft
GCC
Description
/nologo
Do not display compiler version information
/LTCG
Use link-time code generation

Table 30 Dynamic Linker Flags

Microsoft
GCC
Description
/NOLOGO
Do not display compiler version information
/NODEFAULTLIB
-nostdlib
Disable using default libraries
/IGNORE:4086
N/A
Use /Gz option instead
/OPT:ICF=10
Perform identical COMDAT folding (10 iterations) to remove duplicates.
/MAP
-Map filename.map
Create a map file.
/ALIGN:32
--section-alignment 0x20
Use 32-byte alignment instead of the default 4K
--file-alignment 0x20
/MACHINE:$
N/A
Where $ is one of: I386, AMD64 or IA64
/DLL
--dll
The output is a DLL
/LTCG
Use link-time code generation
/ENTRY:$(ENTRYPOINT)
--entry _$(ENTRYPOINT)
The function that specifies a starting address.
/SUBSYSTEM:CONSOLE
--subsystem console
Do not use the EFI_* subsystem interface, as this is EFI 1.0 compliant, not UEFI compliant.
/SAFESEH:NO
Do not produce an image with a table of safe exception handles
/BASE:0
--image-base 0x0
Base address is always 0, and will be adjusted later by the build tools when creating images.
/DRIVER
Specify Kernel mode
/DEBUG
Create debugging information
-O2
Optimize
--gc-sections
Enable garbage collection of unused input sections
--export-all-symbols
All global symbols in the objects used to build a DLL will be exported by the DLL.
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