The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/conf/kern.mk

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    1 # $FreeBSD: releng/7.4/sys/conf/kern.mk 189498 2009-03-07 20:39:42Z nwhitehorn $
    2 
    3 #
    4 # Warning flags for compiling the kernel and components of the kernel.
    5 #
    6 # Note that the newly added -Wcast-qual is responsible for generating 
    7 # most of the remaining warnings.  Warnings introduced with -Wall will
    8 # also pop up, but are easier to fix.
    9 .if ${CC} == "icc"
   10 #CWARNFLAGS=    -w2     # use this if you are terribly bored
   11 CWARNFLAGS=
   12 .else
   13 CWARNFLAGS?=    -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
   14                 -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
   15                 ${_wundef} ${_Wno_pointer_sign} -fformat-extensions
   16 .if !defined(WITH_GCC3)
   17 _Wno_pointer_sign=-Wno-pointer-sign
   18 .endif
   19 .if !defined(NO_UNDEF)
   20 _wundef=        -Wundef
   21 .endif
   22 .endif
   23 #
   24 # The following flags are next up for working on:
   25 #       -W
   26 
   27 #
   28 # On the i386, do not align the stack to 16-byte boundaries.  Otherwise GCC
   29 # 2.95 adds code to the entry and exit point of every function to align the
   30 # stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
   31 # per function call.  While the 16-byte alignment may benefit micro benchmarks, 
   32 # it is probably an overall loss as it makes the code bigger (less efficient
   33 # use of code cache tag lines) and uses more stack (less efficient use of data
   34 # cache tag lines).  Explicitly prohibit the use of SSE and other SIMD
   35 # operations inside the kernel itself.  These operations are exclusively
   36 # reserved for user applications.
   37 #
   38 .if ${MACHINE_ARCH} == "i386" && ${CC} != "icc"
   39 CFLAGS+=        -mno-align-long-strings -mpreferred-stack-boundary=2 \
   40                 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3
   41 INLINE_LIMIT?=  8000
   42 .endif
   43 
   44 .if ${MACHINE_ARCH} == "arm"
   45 INLINE_LIMIT?=  8000
   46 .endif
   47 #
   48 # For IA-64, we use r13 for the kernel globals pointer and we only use
   49 # a very small subset of float registers for integer divides.
   50 #
   51 .if ${MACHINE_ARCH} == "ia64"
   52 CFLAGS+=        -ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata
   53 INLINE_LIMIT?=  15000
   54 .endif
   55 
   56 #
   57 # For sparc64 we want medlow code model, and we tell gcc to use floating
   58 # point emulation.  This avoids using floating point registers for integer
   59 # operations which it has a tendency to do.
   60 #
   61 .if ${MACHINE_ARCH} == "sparc64"
   62 CFLAGS+=        -mcmodel=medany -msoft-float
   63 INLINE_LIMIT?=  15000
   64 .endif
   65 
   66 #
   67 # For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD
   68 # operations inside the kernel itself.  These operations are exclusively
   69 # reserved for user applications.
   70 #
   71 .if ${MACHINE_ARCH} == "amd64"
   72 CFLAGS+=        -mcmodel=kernel -mno-red-zone \
   73                 -mfpmath=387 -mno-sse -mno-sse2 -mno-mmx -mno-3dnow \
   74                 -msoft-float -fno-asynchronous-unwind-tables
   75 INLINE_LIMIT?=  8000
   76 .endif
   77 
   78 #
   79 # For PowerPC we tell gcc to use floating point emulation.  This avoids using
   80 # floating point registers for integer operations which it has a tendency to do.
   81 # Also explicitly disable Altivec instructions inside the kernel.
   82 #
   83 .if ${MACHINE_ARCH} == "powerpc"
   84 CFLAGS+=        -msoft-float -mno-altivec
   85 INLINE_LIMIT?=  15000
   86 .endif
   87 
   88 #
   89 # GCC 3.0 and above like to do certain optimizations based on the
   90 # assumption that the program is linked against libc.  Stop this.
   91 #
   92 .if ${CC} == "icc"
   93 CFLAGS+=        -nolib_inline
   94 .else
   95 CFLAGS+=        -ffreestanding
   96 .endif
   97 
   98 .if ${CC} == "icc"
   99 CFLAGS+=        -restrict
  100 .endif

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