是否有 gcc 标志指定在已经指定时不 compile/link ？
Is there a gcc flag to specify not to compile/link when it's already been specified?
我有一个编译命令：
gcc -c -Demacs -I. -I../../src -I../lib -I../../lib -pthread -isystem /usr/include/gtk-3.0 -isystem /usr/include/at-spi2-atk/2.0 -isystem /usr/include/at-spi-2.0 -isystem /usr/include/dbus-1.0 -isystem /usr/lib/x86_64-linux-gnu/dbus-1.0/include -isystem /usr/include/gtk-3.0 -isystem /usr/include/gio-unix-2.0 -isystem /usr/include/cairo -isystem /usr/include/pango-1.0 -isystem /usr/include/fribidi -isystem /usr/include/harfbuzz -isystem /usr/include/atk-1.0 -isystem /usr/include/cairo -isystem /usr/include/pixman-1 -isystem /usr/include/uuid -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/gdk-pixbuf-2.0 -isystem /usr/include/libmount -isystem /usr/include/blkid -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /usr/include/uuid -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/libpng16 -isystem /usr/include/dbus-1.0 -isystem /usr/lib/x86_64-linux-gnu/dbus-1.0/include -pthread -isystem /usr/include/libmount -isystem /usr/include/blkid -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/uuid -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/harfbuzz -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /usr/include/p11-kit-1 -fno-common -W -Wabsolute-value -Waddress -Waddress-of-packed-member -Waggressive-loop-optimizations -Wall -Wattribute-warning -Wattributes -Wbool-compare -Wbool-operation -Wbuiltin-declaration-mismatch -Wbuiltin-macro-redefined -Wcannot-profile -Wcast-function-type -Wchar-subscripts -Wclobbered -Wcomment -Wcomments -Wcoverage-mismatch -Wcpp -Wdangling-else -Wdate-time -Wdeprecated -Wdeprecated-declarations -Wdesignated-init -Wdisabled-optimization -Wdiscarded-array-qualifiers -Wdiscarded-qualifiers -Wdiv-by-zero -Wdouble-promotion -Wduplicated-cond -Wduplicate-decl-specifier -Wempty-body -Wendif-labels -Wenum-compare -Wexpansion-to-defined -Wextra -Wformat-contains-nul -Wformat-extra-args -Wformat-security -Wformat-signedness -Wformat-y2k -Wformat-zero-length -Wframe-address -Wfree-nonheap-object -Whsa -Wif-not-aligned -Wignored-attributes -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wincompatible-pointer-types -Winit-self -Wint-conversion -Wint-in-bool-context -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wlogical-not-parentheses -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmemset-elt-size -Wmemset-transposed-args -Wmisleading-indentation -Wmissing-attributes -Wmissing-braces -Wmissing-declarations -Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-profile -Wmissing-prototypes -Wmultichar -Wmultistatement-macros -Wnarrowing -Wnested-externs -Wnonnull -Wnonnull-compare -Wnull-dereference -Wodr -Wold-style-declaration -Wold-style-definition -Wopenmp-simd -Woverflow -Wpacked -Wpacked-bitfield-compat -Wpacked-not-aligned -Wparentheses -Wpointer-arith -Wpointer-compare -Wpointer-sign -Wpointer-to-int-cast -Wpragmas -Wpsabi -Wrestrict -Wreturn-local-addr -Wreturn-type -Wscalar-storage-order -Wsequence-point -Wshift-count-negative -Wshift-count-overflow -Wshift-negative-value -Wsizeof-array-argument -Wsizeof-pointer-div -Wsizeof-pointer-memaccess -Wstrict-aliasing -Wstrict-prototypes -Wstringop-truncation -Wsuggest-attribute=format -Wsuggest-attribute=malloc -Wsuggest-attribute=noreturn -Wsuggest-final-methods -Wsuggest-final-types -Wswitch-bool -Wswitch-unreachable -Wtautological-compare -Wtrampolines -Wtrigraphs -Wuninitialized -Wunknown-pragmas -Wunused -Wunused-but-set-parameter -Wunused-but-set-variable -Wunused-function -Wunused-label -Wunused-local-typedefs -Wunused-macros -Wunused-result -Wunused-value -Wunused-variable -Wvarargs -Wvariadic-macros -Wvector-operation-performance -Wvolatile-register-var -Wwrite-strings -Walloc-size-larger-than=9223372036854775807 -Warray-bounds=2 -Wattribute-alias=2 -Wformat-truncation=2 -Wimplicit-fallthrough=5 -Wnormalized=nfc -Wshift-overflow=2 -Wstringop-overflow=2 -Wvla-larger-than=4031 -Wredundant-decls -Wno-missing-field-initializers -Wno-override-init -Wno-sign-compare -Wno-type-limits -Wno-unused-parameter -Wno-format-nonliteral -g3 -O2 ../../src/xfns.c
但我想附加 -H 标志 (https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html)，因为这是我唯一感兴趣的信息（但我需要保持原始编译命令的状态）。
那么有没有办法阻止此命令中的编译，即使我已经指定这样做？就像有没有另一个我可以附加（或前置）的标志，基本上说，“我知道我指定了这个，但忽略它”。
您可以使用 -o /dev/null 完全丢弃输出，或者您可以将其发送到一个临时文件，然后将其删除。如果您关心编译时间，可以添加 -E 以便仅 运行 预处理器，这是 -H 工作的最低要求。这是有效的，因为如果你告诉 gcc 在预处理后停止 (-H)，那么你是否也告诉它在创建目标文件后停止 (-c) 并不重要。 （这是 gcc 使用一组冲突选项的最后一个的一般规则的一个例外，它旨在让您通过添加到命令行末尾来覆盖选项。）
但是，我不禁认为这并不是解决您问题的最佳方法。看起来你已经手工制作了一个带有许多选项的编译器调用，然后把它放在难以修改的地方。更好的解决方案是使用 makefile 并设置各种标准 makefile 变量的值——例如 CFLAGS、CPPFLAGS、LDFLAGS、LDLIBS——它们是记录在 Gnu make manual 中。在简单的情况下，您的 Makefile 可能仅包含设置这些变量的行，因为 Gnu make 具有针对通用目标的内置规则。
我有一个编译命令：
gcc -c -Demacs -I. -I../../src -I../lib -I../../lib -pthread -isystem /usr/include/gtk-3.0 -isystem /usr/include/at-spi2-atk/2.0 -isystem /usr/include/at-spi-2.0 -isystem /usr/include/dbus-1.0 -isystem /usr/lib/x86_64-linux-gnu/dbus-1.0/include -isystem /usr/include/gtk-3.0 -isystem /usr/include/gio-unix-2.0 -isystem /usr/include/cairo -isystem /usr/include/pango-1.0 -isystem /usr/include/fribidi -isystem /usr/include/harfbuzz -isystem /usr/include/atk-1.0 -isystem /usr/include/cairo -isystem /usr/include/pixman-1 -isystem /usr/include/uuid -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/gdk-pixbuf-2.0 -isystem /usr/include/libmount -isystem /usr/include/blkid -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /usr/include/uuid -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/libpng16 -isystem /usr/include/dbus-1.0 -isystem /usr/lib/x86_64-linux-gnu/dbus-1.0/include -pthread -isystem /usr/include/libmount -isystem /usr/include/blkid -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/uuid -isystem /usr/include/freetype2 -isystem /usr/include/libpng16 -isystem /usr/include/harfbuzz -isystem /usr/include/glib-2.0 -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem /usr/include/p11-kit-1 -fno-common -W -Wabsolute-value -Waddress -Waddress-of-packed-member -Waggressive-loop-optimizations -Wall -Wattribute-warning -Wattributes -Wbool-compare -Wbool-operation -Wbuiltin-declaration-mismatch -Wbuiltin-macro-redefined -Wcannot-profile -Wcast-function-type -Wchar-subscripts -Wclobbered -Wcomment -Wcomments -Wcoverage-mismatch -Wcpp -Wdangling-else -Wdate-time -Wdeprecated -Wdeprecated-declarations -Wdesignated-init -Wdisabled-optimization -Wdiscarded-array-qualifiers -Wdiscarded-qualifiers -Wdiv-by-zero -Wdouble-promotion -Wduplicated-cond -Wduplicate-decl-specifier -Wempty-body -Wendif-labels -Wenum-compare -Wexpansion-to-defined -Wextra -Wformat-contains-nul -Wformat-extra-args -Wformat-security -Wformat-signedness -Wformat-y2k -Wformat-zero-length -Wframe-address -Wfree-nonheap-object -Whsa -Wif-not-aligned -Wignored-attributes -Wignored-qualifiers -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wincompatible-pointer-types -Winit-self -Wint-conversion -Wint-in-bool-context -Wint-to-pointer-cast -Winvalid-memory-model -Winvalid-pch -Wlogical-not-parentheses -Wlogical-op -Wmain -Wmaybe-uninitialized -Wmemset-elt-size -Wmemset-transposed-args -Wmisleading-indentation -Wmissing-attributes -Wmissing-braces -Wmissing-declarations -Wmissing-include-dirs -Wmissing-parameter-type -Wmissing-profile -Wmissing-prototypes -Wmultichar -Wmultistatement-macros -Wnarrowing -Wnested-externs -Wnonnull -Wnonnull-compare -Wnull-dereference -Wodr -Wold-style-declaration -Wold-style-definition -Wopenmp-simd -Woverflow -Wpacked -Wpacked-bitfield-compat -Wpacked-not-aligned -Wparentheses -Wpointer-arith -Wpointer-compare -Wpointer-sign -Wpointer-to-int-cast -Wpragmas -Wpsabi -Wrestrict -Wreturn-local-addr -Wreturn-type -Wscalar-storage-order -Wsequence-point -Wshift-count-negative -Wshift-count-overflow -Wshift-negative-value -Wsizeof-array-argument -Wsizeof-pointer-div -Wsizeof-pointer-memaccess -Wstrict-aliasing -Wstrict-prototypes -Wstringop-truncation -Wsuggest-attribute=format -Wsuggest-attribute=malloc -Wsuggest-attribute=noreturn -Wsuggest-final-methods -Wsuggest-final-types -Wswitch-bool -Wswitch-unreachable -Wtautological-compare -Wtrampolines -Wtrigraphs -Wuninitialized -Wunknown-pragmas -Wunused -Wunused-but-set-parameter -Wunused-but-set-variable -Wunused-function -Wunused-label -Wunused-local-typedefs -Wunused-macros -Wunused-result -Wunused-value -Wunused-variable -Wvarargs -Wvariadic-macros -Wvector-operation-performance -Wvolatile-register-var -Wwrite-strings -Walloc-size-larger-than=9223372036854775807 -Warray-bounds=2 -Wattribute-alias=2 -Wformat-truncation=2 -Wimplicit-fallthrough=5 -Wnormalized=nfc -Wshift-overflow=2 -Wstringop-overflow=2 -Wvla-larger-than=4031 -Wredundant-decls -Wno-missing-field-initializers -Wno-override-init -Wno-sign-compare -Wno-type-limits -Wno-unused-parameter -Wno-format-nonliteral -g3 -O2 ../../src/xfns.c
但我想附加 -H 标志 (https://gcc.gnu.org/onlinedocs/gcc/Preprocessor-Options.html)，因为这是我唯一感兴趣的信息（但我需要保持原始编译命令的状态）。
那么有没有办法阻止此命令中的编译，即使我已经指定这样做？就像有没有另一个我可以附加（或前置）的标志，基本上说，“我知道我指定了这个，但忽略它”。
您可以使用 -o /dev/null 完全丢弃输出，或者您可以将其发送到一个临时文件，然后将其删除。如果您关心编译时间，可以添加 -E 以便仅 运行 预处理器，这是 -H 工作的最低要求。这是有效的，因为如果你告诉 gcc 在预处理后停止 (-H)，那么你是否也告诉它在创建目标文件后停止 (-c) 并不重要。 （这是 gcc 使用一组冲突选项的最后一个的一般规则的一个例外，它旨在让您通过添加到命令行末尾来覆盖选项。）
但是，我不禁认为这并不是解决您问题的最佳方法。看起来你已经手工制作了一个带有许多选项的编译器调用，然后把它放在难以修改的地方。更好的解决方案是使用 makefile 并设置各种标准 makefile 变量的值——例如 CFLAGS、CPPFLAGS、LDFLAGS、LDLIBS——它们是记录在 Gnu make manual 中。在简单的情况下，您的 Makefile 可能仅包含设置这些变量的行，因为 Gnu make 具有针对通用目标的内置规则。