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GCC Compiler Option 2 : Preprocessor Options

-Mxxx

  • -M option is designed for auto-generate Makefile rules from g++ command.
  • 默认包含-E option to STOP after preprocessor during the compilation
  • 默认包含-w option to DISABLE/suppress all warnings.

Using a complex g++ command as an example:

g++ -Wall -Werror -Wno-unknown-pragmas -DPIN_CRT=1 -fno-stack-protector -fno-exceptions -funwind-tables -fasynchronous-unwind-tables -fno-rtti -DTARGET_IA32E -DHOST_IA32E -fPIC -DTARGET_LINUX -fabi-version=2 -faligned-new -I../../../source/include/pin -I../../../source/include/pin/gen -isystem /staff/shaojiemike/Download/pin-3.28-98749-g6643ecee5-gcc-linux/extras/cxx/include -isystem /staff/shaojiemike/Download/pin-3.28-98749-g6643ecee5-gcc-linux/extras/crt/include -isystem /staff/shaojiemike/Download/pin-3.28-98749-g6643ecee5-gcc-linux/extras/crt/include/arch-x86_64 -isystem /staff/shaojiemike/Download/pin-3.28-98749-g6643ecee5-gcc-linux/extras/crt/include/kernel/uapi -isystem /staff/shaojiemike/Download/pin-3.28-98749-g6643ecee5-gcc-linux/extras/crt/include/kernel/uapi/asm-x86 -I../../../extras/components/include -I../../../extras/xed-intel64/include/xed -I../../../source/tools/Utils -I../../../source/tools/InstLib -O3 -fomit-frame-pointer -fno-strict-aliasing -Wno-dangling-pointer 
-M inscount0.cpp -o Makefile_bk

In Makefile_bk

inscount0.o: inscount0.cpp \
 # sys header
 /usr/include/stdc-predef.h \
 /staff/shaojiemike/Download/pin-3.28-98749-g6643ecee5-gcc-linux/extras/cxx/include/iostream \
 /usr/lib/gcc/x86_64-linux-gnu/11/include/float.h
 # usr header
 ../../../source/include/pin/pin.H \
 ../../../extras/xed-intel64/include/xed/xed-interface.h \
 ... more header files
  • -MM not include sys header file
  • e.g., the first 3 header will be disapear.
  • -MF filename config the Makefile rules write to which file instead of to stdout.
  • -M -MG is designed to generate Makefile rules when there is header file missing, treated it as generated in normal.
  • -M -MP will generated M-rules for dependency between header files
  • e.g., header1.h includes header2.h. So header1.h: header2.h in Makefile
  • -MD == -M -MF file without default option -E
  • the default file has a suffix of .d, e.g., inscount0.d for -c inscount0.cpp
  • -MMD == -MD not include sys header file

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