These options are defined for all architectures running the Darwin operating system.
FSF GCC on Darwin does not create “fat” object files; it will create an object file for the single architecture that it was built to target. Apple's GCC on Darwin does create “fat” files if multiple -arch options are used; it does so by running the compiler or linker multiple times and joining the results together with lipo.
The subtype of the file created (like ppc7400 or ppc970 or i686) is determined by the flags that specify the ISA that GCC is targetting, like -mcpu or -march. The -force_cpusubtype_ALL option can be used to override this.
The Darwin tools vary in their behavior when presented with an ISA mismatch. The assembler, as, will only permit instructions to be used that are valid for the subtype of the file it is generating, so you cannot put 64-bit instructions in an ppc750 object file. The linker for shared libraries, /usr/bin/libtool, will fail and print an error if asked to create a shared library with a less restrictive subtype than its input files (for instance, trying to put a ppc970 object file in a ppc7400 library). The linker for executables, ld, will quietly give the executable the most restrictive subtype of any of its input files.
-F
dir
Add the framework directory dir to the head of the list of directories to be searched for header files. These directories are interleaved with those specified by -I options and are scanned in a left-to-right order.
A framework directory is a directory with frameworks in it. A
framework is a directory with a "Headers" and/or
"PrivateHeaders" directory contained directly in it that ends
in ".framework". The name of a framework is the name of this
directory excluding the ".framework". Headers associated with
the framework are found in one of those two directories, with
"Headers" being searched first. A subframework is a framework
directory that is in a framework's "Frameworks" directory.
Includes of subframework headers can only appear in a header of a
framework that contains the subframework, or in a sibling subframework
header. Two subframeworks are siblings if they occur in the same
framework. A subframework should not have the same name as a
framework, a warning will be issued if this is violated. Currently a
subframework cannot have subframeworks, in the future, the mechanism
may be extended to support this. The standard frameworks can be found
in "/System/Library/Frameworks" and
"/Library/Frameworks". An example include looks like
#include <Framework/header.h>, where Framework denotes
the name of the framework and header.h is found in the
"PrivateHeaders" or "Headers" directory.
-iframework
dir
Like -F except the directory is a treated as a system
directory. The main difference between this -iframework and
-F is that with -iframework the compiler does not
warn about constructs contained within header files found via
dir. This option is valid only for the C family of languages.
-gused
Emit debugging information for symbols that are used. For STABS
debugging format, this enables -feliminate-unused-debug-symbols.
This is by default ON.
-gfull
Emit debugging information for all symbols and types.
-mmacosx-version-min=
version
10.1,
10.2, and 10.3.9.
If the compiler was built to use the system's headers by default,
then the default for this option is the system version on which the
compiler is running, otherwise the default is to make choices which
are compatible with as many systems and code bases as possible.
-mkernel
Enable kernel development mode. The -mkernel option sets
-static, -fno-common, -fno-cxa-atexit,
-fno-exceptions, -fno-non-call-exceptions,
-fapple-kext, -fno-weak and -fno-rtti where
applicable. This mode also sets -mno-altivec,
-msoft-float, -fno-builtin and
-mlong-branch for PowerPC targets.
-mone-byte-bool
Override the defaults for bool so that sizeof(bool)==1. By default sizeof(bool) is 4 when compiling for Darwin/PowerPC and 1 when compiling for Darwin/x86, so this option has no effect on x86.
Warning: The -mone-byte-bool switch causes GCC
to generate code that is not binary compatible with code generated
without that switch. Using this switch may require recompiling all
other modules in a program, including system libraries. Use this
switch to conform to a non-default data model.
-mfix-and-continue
-ffix-and-continue
-findirect-data
Generate code suitable for fast turn around development. Needed to
enable gdb to dynamically load .o files into already running
programs. -findirect-data and -ffix-and-continue
are provided for backwards compatibility.
-all_load
Loads all members of static archive libraries.
See man ld(1) for more information.
-arch_errors_fatal
Cause the errors having to do with files that have the wrong architecture
to be fatal.
-bind_at_load
Causes the output file to be marked such that the dynamic linker will
bind all undefined references when the file is loaded or launched.
-bundle
Produce a Mach-o bundle format file.
See man ld(1) for more information.
-bundle_loader
executable
This option specifies the executable that will be loading the build
output file being linked. See man ld(1) for more information.
-dynamiclib
When passed this option, GCC will produce a dynamic library instead of
an executable when linking, using the Darwin libtool command.
-force_cpusubtype_ALL
This causes GCC's output file to have the ALL subtype, instead of
one controlled by the -mcpu or -march option.
-allowable_client
client_name
-client_name
-compatibility_version
-current_version
-dead_strip
-dependency-file
-dylib_file
-dylinker_install_name
-dynamic
-exported_symbols_list
-filelist
-flat_namespace
-force_flat_namespace
-headerpad_max_install_names
-image_base
-init
-install_name
-keep_private_externs
-multi_module
-multiply_defined
-multiply_defined_unused
-noall_load
-no_dead_strip_inits_and_terms
-nofixprebinding
-nomultidefs
-noprebind
-noseglinkedit
-pagezero_size
-prebind
-prebind_all_twolevel_modules
-private_bundle
-read_only_relocs
-sectalign
-sectobjectsymbols
-whyload
-seg1addr
-sectcreate
-sectobjectsymbols
-sectorder
-segaddr
-segs_read_only_addr
-segs_read_write_addr
-seg_addr_table
-seg_addr_table_filename
-seglinkedit
-segprot
-segs_read_only_addr
-segs_read_write_addr
-single_module
-static
-sub_library
-sub_umbrella
-twolevel_namespace
-umbrella
-undefined
-unexported_symbols_list
-weak_reference_mismatches
-whatsloaded
These options are passed to the Darwin linker. The Darwin linker man page describes them in detail.