makefiles - compile all c files at once

Question

I want to experiment with GCC whole program optimizations  To do so I have to pass all C-files at once to the compiler frontend  However  I use makefiles to automate my build process  and I m not an expert when it comes to makefile magic   How should I modify the makefile if I want to compile  maybe even link  using just one call to GCC   For reference - my makefile looks like this   LIBS    -lkernel32 -luser32 -lgdi32 -lopengl32 CFLAGS   -Wall  OBJ   64bitmath o            monotone o             node sort o            planesweep o           triangulate o          prim combine o         welding o              test o                 main o    o     c     gcc -c   CFLAGS    lt  -o     test    OBJ      gcc -o         CFLAGS    LIBS

User · Accepted Answer

LIBS    -lkernel32 -luser32 -lgdi32 -lopengl32 CFLAGS   -Wall    Should be equivalent to your list of C files  if you don t build selectively SRC   wildcard   c   test    SRC      gcc -o         CFLAGS    LIBS

User · Answer

You need to take out your suffix rule    o    c  in favour of a big-bang rule  Something like this   LIBS    -lkernel32 -luser32 -lgdi32 -lopengl32 CFLAGS   -Wall  OBJ   64bitmath o            monotone o             node sort o            planesweep o           triangulate o          prim combine o         welding o              test o                 main o  SRCS     OBJ   o   c   test    SRCS      gcc -o       CFLAGS    LIBS    SRCS    If you re going to experiment with GCC s whole-program optimization  make sure that you add the appropriate flag to CFLAGS  above   On reading through the docs for those flags  I see notes about link-time optimization as well  you should investigate those too

User · Answer

You need to take out your suffix rule    o    c  in favour of a big-bang rule  Something like this   LIBS    -lkernel32 -luser32 -lgdi32 -lopengl32 CFLAGS   -Wall  OBJ   64bitmath o            monotone o             node sort o            planesweep o           triangulate o          prim combine o         welding o              test o                 main o  SRCS     OBJ   o   c   test    SRCS      gcc -o       CFLAGS    LIBS    SRCS    If you re going to experiment with GCC s whole-program optimization  make sure that you add the appropriate flag to CFLAGS  above   On reading through the docs for those flags  I see notes about link-time optimization as well  you should investigate those too

User · Answer

SRCS   wildcard   c   OBJS   SRCS  c  o   all    OBJS

User · Answer

SRCS   wildcard   c   OBJS   SRCS  c  o   all    OBJS

[c] makefiles - compile all c files at once

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