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gcc -c 编译源文件而不链接

$ gcc -c [options] [source files]

gcc -D定义了一个宏供预处理器使用

$ gcc -Dname [options] [source files] [-o output file]
$ gcc -Dname=definition [options] [source files] [-o output file]

gcc -fPIC：生成位置无关目标代码，适用于动态连接

$ gcc -fPIC [options] [source files] [object files] -o output file

如果平台编译器支持，使用-fpic而不是-fPIC来生成更有效的代码

gcc -g 生成 GDB 调试器使用的调试信息

$ gcc -glevel [options] [source files] [object files] [-o output file]

gcc -I 添加头文件的include目录

$ gcc -Idir [options] [source files] [object files] [-o output file]

gcc -l 链接一个库文件

gcc -L 在目录中查找库文件

$ gcc [options] [source files] [object files] [-Ldir] -llibname [-o outfile]

-l用不带lib前缀和.a或.so扩展名的库名链接

对于静态库文件libmath.a使用-lmath

$ gcc -static myfile.c -lmath -o myfile

对于共享库文件libmath.so使用-lmath

$ gcc myfile.c -lmath -o myfile

gcc -O选项标志

设置编译器的优化级别

+increase ++increase more +++increase even more

-reduce --reduce more ---reduce even more

gcc -Wall启用所有编译器的警告消息。为了生成更好的代码，应该经常使用这个选项

-Wxxx 启用额外的警告标志

-fxxx 启用标志

-mxxx 启用模式

See Section 3.2 [Options Controlling the Kind of Output], page 33.
-c -S -E -o file
-dumpbase dumpbase -dumpbase-ext auxdropsuf
-dumpdir dumppfx -x language
-v -### --help[=class[,...]] --target-help --version
-pass-exit-codes -pipe -specs=file -wrapper
@file -ffile-prefix-map=old=new
-fplugin=file -fplugin-arg-name=arg
-fdump-ada-spec[-slim] -fada-spec-parent=unit -fdump-go-spec=file

See Section 3.4 [Options Controlling C Dialect], page 44.
-ansi -std=standard -aux-info filename
-fallow-parameterless-variadic-functions -fno-asm
-fno-builtin -fno-builtin-function -fcond-mismatch
-ffreestanding -fgimple -fgnu-tm -fgnu89-inline -fhosted
-flax-vector-conversions -fms-extensions
-foffload=arg -foffload-options=arg
-fopenacc -fopenacc-dim=geom
-fopenmp -fopenmp-simd
-fpermitted-flt-eval-methods=standard
-fplan9-extensions -fsigned-bitfields -funsigned-bitfields
-fsigned-char -funsigned-char -fsso-struct=endianness

See Section 3.5 [Options Controlling C++ Dialect], page 51.
-fabi-version=n -fno-access-control
-faligned-new=n -fargs-in-order=n -fchar8_t -fcheck-new
-fconstexpr-depth=n -fconstexpr-cache-depth=n
-fconstexpr-loop-limit=n -fconstexpr-ops-limit=n
-fno-elide-constructors
-fno-enforce-eh-specs
-fno-gnu-keywords
-fno-implicit-templates
-fno-implicit-inline-templates
-fno-implement-inlines
-fmodule-header[=kind] -fmodule-only -fmodules-ts
-fmodule-implicit-inline
-fno-module-lazy
-fmodule-mapper=specification
-fmodule-version-ignore
-fms-extensions
-fnew-inheriting-ctors
-fnew-ttp-matching
-fno-nonansi-builtins -fnothrow-opt -fno-operator-names
-fno-optional-diags -fpermissive
-fno-pretty-templates
-fno-rtti -fsized-deallocation
-ftemplate-backtrace-limit=n
-ftemplate-depth=n
-fno-threadsafe-statics -fuse-cxa-atexit
-fno-weak -nostdinc++
-fvisibility-inlines-hidden
-fvisibility-ms-compat
-fext-numeric-literals
-flang-info-include-translate[=header]
-flang-info-include-translate-not
-flang-info-module-cmi[=module]
-stdlib=libstdc++,libc++
-Wabi-tag -Wcatch-value -Wcatch-value=n
-Wno-class-conversion -Wclass-memaccess
-Wcomma-subscript -Wconditionally-supported
-Wno-conversion-null -Wctad-maybe-unsupported
-Wctor-dtor-privacy -Wno-delete-incomplete
-Wdelete-non-virtual-dtor -Wno-deprecated-array-compare
-Wdeprecated-copy -Wdeprecated-copy-dtor
-Wno-deprecated-enum-enum-conversion -Wno-deprecated-enum-float-conversion
-Weffc++ -Wno-exceptions -Wextra-semi -Wno-inaccessible-base
-Wno-inherited-variadic-ctor -Wno-init-list-lifetime
-Winvalid-imported-macros
-Wno-invalid-offsetof -Wno-literal-suffix
-Wmismatched-new-delete -Wmismatched-tags
-Wmultiple-inheritance -Wnamespaces -Wnarrowing
-Wnoexcept -Wnoexcept-type -Wnon-virtual-dtor
-Wpessimizing-move -Wno-placement-new -Wplacement-new=n
-Wrange-loop-construct -Wredundant-move -Wredundant-tags
-Wreorder -Wregister
-Wstrict-null-sentinel -Wno-subobject-linkage -Wtemplates
-Wno-non-template-friend -Wold-style-cast
-Woverloaded-virtual -Wno-pmf-conversions -Wsign-promo
-Wsized-deallocation -Wsuggest-final-methods
-Wsuggest-final-types -Wsuggest-override
-Wno-terminate -Wuseless-cast -Wno-vexing-parse
-Wvirtual-inheritance
-Wno-virtual-move-assign -Wvolatile -Wzero-as-null-pointer-constant

See Section 3.8 [Options to Request or Suppress Warnings], page 89.
-fsyntax-only -fmax-errors=n -Wpedantic
-pedantic-errors
-w -Wextra -Wall -Wabi=n
-Waddress -Wno-address-of-packed-member -Waggregate-return
-Walloc-size-larger-than=byte-size -Walloc-zero
-Walloca -Walloca-larger-than=byte-size
-Wno-aggressive-loop-optimizations
-Warith-conversion
-Warray-bounds -Warray-bounds=n -Warray-compare
-Wno-attributes -Wattribute-alias=n -Wno-attribute-alias
-Wno-attribute-warning
-Wbidi-chars=[none|unpaired|any|ucn]
-Wbool-compare -Wbool-operation
-Wno-builtin-declaration-mismatch
-Wno-builtin-macro-redefined -Wc90-c99-compat -Wc99-c11-compat
-Wc11-c2x-compat
-Wc++-compat -Wc++11-compat -Wc++14-compat -Wc++17-compat
-Wc++20-compat
-Wno-c++11-extensions -Wno-c++14-extensions -Wno-c++17-extensions
-Wno-c++20-extensions -Wno-c++23-extensions
-Wcast-align -Wcast-align=strict -Wcast-function-type -Wcast-qual
-Wchar-subscripts
-Wclobbered -Wcomment
-Wconversion -Wno-coverage-mismatch -Wno-cpp
-Wdangling-else -Wdangling-pointer -Wdangling-pointer=n
-Wdate-time
-Wno-deprecated -Wno-deprecated-declarations -Wno-designated-init
-Wdisabled-optimization
-Wno-discarded-array-qualifiers -Wno-discarded-qualifiers
-Wno-div-by-zero -Wdouble-promotion
-Wduplicated-branches -Wduplicated-cond
-Wempty-body -Wno-endif-labels -Wenum-compare -Wenum-conversion
-Werror -Werror=* -Wexpansion-to-defined -Wfatal-errors
-Wfloat-conversion -Wfloat-equal -Wformat -Wformat=2
-Wno-format-contains-nul -Wno-format-extra-args
-Wformat-nonliteral -Wformat-overflow=n
-Wformat-security -Wformat-signedness -Wformat-truncation=n
-Wformat-y2k -Wframe-address
-Wframe-larger-than=byte-size -Wno-free-nonheap-object
-Wno-if-not-aligned -Wno-ignored-attributes
-Wignored-qualifiers -Wno-incompatible-pointer-types
-Wimplicit -Wimplicit-fallthrough -Wimplicit-fallthrough=n
-Wno-implicit-function-declaration -Wno-implicit-int
-Winfinite-recursion
-Winit-self -Winline -Wno-int-conversion -Wint-in-bool-context
-Wno-int-to-pointer-cast -Wno-invalid-memory-model
-Winvalid-pch -Wjump-misses-init -Wlarger-than=byte-size
-Wlogical-not-parentheses -Wlogical-op -Wlong-long
-Wno-lto-type-mismatch -Wmain -Wmaybe-uninitialized
-Wmemset-elt-size -Wmemset-transposed-args
-Wmisleading-indentation -Wmissing-attributes -Wmissing-braces
-Wmissing-field-initializers -Wmissing-format-attribute
-Wmissing-include-dirs -Wmissing-noreturn -Wno-missing-profile
-Wno-multichar -Wmultistatement-macros -Wnonnull -Wnonnull-compare
-Wnormalized=[none|id|nfc|nfkc]
-Wnull-dereference -Wno-odr
-Wopenacc-parallelism
-Wopenmp-simd
-Wno-overflow -Woverlength-strings -Wno-override-init-side-effects
-Wpacked -Wno-packed-bitfield-compat -Wpacked-not-aligned -Wpadded
-Wparentheses -Wno-pedantic-ms-format
-Wpointer-arith -Wno-pointer-compare -Wno-pointer-to-int-cast
-Wno-pragmas -Wno-prio-ctor-dtor -Wredundant-decls
-Wrestrict -Wno-return-local-addr -Wreturn-type
-Wno-scalar-storage-order -Wsequence-point
-Wshadow -Wshadow=global -Wshadow=local -Wshadow=compatible-local
-Wno-shadow-ivar
-Wno-shift-count-negative -Wno-shift-count-overflow -Wshift-negative-value
-Wno-shift-overflow -Wshift-overflow=n
-Wsign-compare -Wsign-conversion
-Wno-sizeof-array-argument
-Wsizeof-array-div
-Wsizeof-pointer-div -Wsizeof-pointer-memaccess
-Wstack-protector -Wstack-usage=byte-size -Wstrict-aliasing
-Wstrict-aliasing=n -Wstrict-overflow -Wstrict-overflow=n
-Wstring-compare
-Wno-stringop-overflow -Wno-stringop-overread
-Wno-stringop-truncation
-Wsuggest-attribute=[pure|const|noreturn|format|malloc]
-Wswitch -Wno-switch-bool -Wswitch-default -Wswitch-enum
-Wno-switch-outside-range -Wno-switch-unreachable -Wsync-nand
-Wsystem-headers -Wtautological-compare -Wtrampolines -Wtrigraphs
-Wtrivial-auto-var-init -Wtsan -Wtype-limits -Wundef
-Wuninitialized -Wunknown-pragmas
-Wunsuffixed-float-constants -Wunused
-Wunused-but-set-parameter -Wunused-but-set-variable
-Wunused-const-variable -Wunused-const-variable=n
-Wunused-function -Wunused-label -Wunused-local-typedefs
-Wunused-macros
-Wunused-parameter -Wno-unused-result
-Wunused-value -Wunused-variable
-Wno-varargs -Wvariadic-macros
-Wvector-operation-performance
-Wvla -Wvla-larger-than=byte-size -Wno-vla-larger-than
-Wvolatile-register-var -Wwrite-strings
-Wzero-length-bounds

See Section 3.10 [Options for Debugging Your Program], page 153.
-g -glevel -gdwarf -gdwarf-version
-gbtf -gctf -gctflevel
-ggdb -grecord-gcc-switches -gno-record-gcc-switches
-gstabs -gstabs+ -gstrict-dwarf -gno-strict-dwarf
-gas-loc-support -gno-as-loc-support
-gas-locview-support -gno-as-locview-support
-gcolumn-info -gno-column-info -gdwarf32 -gdwarf64
-gstatement-frontiers -gno-statement-frontiers
-gvariable-location-views -gno-variable-location-views
-ginternal-reset-location-views -gno-internal-reset-location-views
-ginline-points -gno-inline-points
-gvms -gxcoff -gxcoff+ -gz[=type]
-gsplit-dwarf -gdescribe-dies -gno-describe-dies
-fdebug-prefix-map=old=new -fdebug-types-section
-fno-eliminate-unused-debug-types
-femit-struct-debug-baseonly -femit-struct-debug-reduced
-femit-struct-debug-detailed[=spec-list]
-fno-eliminate-unused-debug-symbols -femit-class-debug-always
-fno-merge-debug-strings -fno-dwarf2-cfi-asm
-fvar-tracking -fvar-tracking-assignments

See Section 3.13 [Options Controlling the Preprocessor], page 251.
-Aquestion=answer
-A-question[=answer]
-C -CC -Dmacro[=defn]
-dD -dI -dM -dN -dU
-fdebug-cpp -fdirectives-only -fdollars-in-identifiers
-fexec-charset=charset -fextended-identifiers
-finput-charset=charset -flarge-source-files
-fmacro-prefix-map=old=new -fmax-include-depth=depth
-fno-canonical-system-headers -fpch-deps -fpch-preprocess
-fpreprocessed -ftabstop=width -ftrack-macro-expansion
-fwide-exec-charset=charset -fworking-directory
-H -imacros file -include file
-M -MD -MF -MG -MM -MMD -MP -MQ -MT -Mno-modules
-no-integrated-cpp -P -pthread -remap
-traditional -traditional-cpp -trigraphs
-Umacro -undef
-Wp,option -Xpreprocessor option

See Section 3.14 [Passing Options to the Assembler], page 258.
-Wa,option -Xassembler option

See Section 3.15 [Options for Linking], page 259.
object-file-name -fuse-ld=linker -llibrary
-nostartfiles -nodefaultlibs -nolibc -nostdlib
-e entry --entry=entry
-pie -pthread -r -rdynamic
-s -static -static-pie -static-libgcc -static-libstdc++
-static-libasan -static-libtsan -static-liblsan -static-libubsan
-shared -shared-libgcc -symbolic
-T script -Wl,option -Xlinker option
-u symbol -z keyword