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/9.2/sys/conf/kern.mk 245431 2013-01-14 19:51:26Z dim $
    2 
    3 #
    4 # Warning flags for compiling the kernel and components of the kernel:
    5 #
    6 CWARNFLAGS?=    -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
    7                 -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
    8                 -Wundef -Wno-pointer-sign -fformat-extensions \
    9                 -Wmissing-include-dirs -fdiagnostics-show-option \
   10                 ${CWARNEXTRA}
   11 #
   12 # The following flags are next up for working on:
   13 #       -Wextra
   14 
   15 # Disable a few warnings for clang, since there are several places in the
   16 # kernel where fixing them is more trouble than it is worth, or where there is
   17 # a false positive.
   18 .if ${COMPILER_TYPE} == "clang"
   19 NO_WCONSTANT_CONVERSION=        -Wno-constant-conversion
   20 NO_WARRAY_BOUNDS=               -Wno-array-bounds
   21 NO_WSHIFT_COUNT_NEGATIVE=       -Wno-shift-count-negative
   22 NO_WSHIFT_COUNT_OVERFLOW=       -Wno-shift-count-overflow
   23 NO_WUNUSED_VALUE=               -Wno-unused-value
   24 NO_WSELF_ASSIGN=                -Wno-self-assign
   25 NO_WFORMAT_SECURITY=            -Wno-format-security
   26 NO_WUNNEEDED_INTERNAL_DECL=     -Wno-unneeded-internal-declaration
   27 NO_WSOMETIMES_UNINITIALIZED=    -Wno-error-sometimes-uninitialized
   28 # Several other warnings which might be useful in some cases, but not severe
   29 # enough to error out the whole kernel build.  Display them anyway, so there is
   30 # some incentive to fix them eventually.
   31 CWARNEXTRA?=    -Wno-error-tautological-compare -Wno-error-empty-body \
   32                 -Wno-error-parentheses-equality
   33 .endif
   34 
   35 #
   36 # On i386, do not align the stack to 16-byte boundaries.  Otherwise GCC 2.95
   37 # and above adds code to the entry and exit point of every function to align the
   38 # stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
   39 # per function call.  While the 16-byte alignment may benefit micro benchmarks,
   40 # it is probably an overall loss as it makes the code bigger (less efficient
   41 # use of code cache tag lines) and uses more stack (less efficient use of data
   42 # cache tag lines).  Explicitly prohibit the use of FPU, SSE and other SIMD
   43 # operations inside the kernel itself.  These operations are exclusively
   44 # reserved for user applications.
   45 #
   46 # gcc:
   47 # Setting -mno-mmx implies -mno-3dnow
   48 # Setting -mno-sse implies -mno-sse2, -mno-sse3 and -mno-ssse3
   49 #
   50 # clang:
   51 # Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
   52 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
   53 #
   54 .if ${MACHINE_CPUARCH} == "i386"
   55 .if ${COMPILER_TYPE} != "clang"
   56 CFLAGS+=        -mno-align-long-strings -mpreferred-stack-boundary=2
   57 .else
   58 CFLAGS+=        -mno-aes -mno-avx
   59 .endif
   60 CFLAGS+=        -mno-mmx -mno-sse -msoft-float
   61 INLINE_LIMIT?=  8000
   62 .endif
   63 
   64 .if ${MACHINE_CPUARCH} == "arm"
   65 INLINE_LIMIT?=  8000
   66 .endif
   67 
   68 #
   69 # For IA-64, we use r13 for the kernel globals pointer and we only use
   70 # a very small subset of float registers for integer divides.
   71 #
   72 .if ${MACHINE_CPUARCH} == "ia64"
   73 CFLAGS+=        -ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata
   74 INLINE_LIMIT?=  15000
   75 .endif
   76 
   77 #
   78 # For sparc64 we want the medany code model so modules may be located
   79 # anywhere in the 64-bit address space.  We also tell GCC to use floating
   80 # point emulation.  This avoids using floating point registers for integer
   81 # operations which it has a tendency to do.
   82 #
   83 .if ${MACHINE_CPUARCH} == "sparc64"
   84 CFLAGS+=        -mcmodel=medany -msoft-float
   85 INLINE_LIMIT?=  15000
   86 .endif
   87 
   88 #
   89 # For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD
   90 # operations inside the kernel itself.  These operations are exclusively
   91 # reserved for user applications.
   92 #
   93 # gcc:
   94 # Setting -mno-mmx implies -mno-3dnow
   95 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3 and -mfpmath=387
   96 #
   97 # clang:
   98 # Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
   99 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
  100 # (-mfpmath= is not supported)
  101 #
  102 .if ${MACHINE_CPUARCH} == "amd64"
  103 .if ${COMPILER_TYPE} == "clang"
  104 CFLAGS+=        -mno-aes -mno-avx
  105 .endif
  106 CFLAGS+=        -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float \
  107                 -fno-asynchronous-unwind-tables
  108 INLINE_LIMIT?=  8000
  109 .endif
  110 
  111 #
  112 # For PowerPC we tell gcc to use floating point emulation.  This avoids using
  113 # floating point registers for integer operations which it has a tendency to do.
  114 # Also explicitly disable Altivec instructions inside the kernel.
  115 #
  116 .if ${MACHINE_CPUARCH} == "powerpc"
  117 CFLAGS+=        -msoft-float -mno-altivec
  118 INLINE_LIMIT?=  15000
  119 .endif
  120 
  121 #
  122 # Use dot symbols on powerpc64 to make ddb happy
  123 #
  124 .if ${MACHINE_ARCH} == "powerpc64"
  125 CFLAGS+=        -mcall-aixdesc
  126 .endif
  127 
  128 #
  129 # For MIPS we also tell gcc to use floating point emulation
  130 #
  131 .if ${MACHINE_CPUARCH} == "mips"
  132 CFLAGS+=        -msoft-float
  133 INLINE_LIMIT?=  8000
  134 .endif
  135 
  136 #
  137 # GCC 3.0 and above like to do certain optimizations based on the
  138 # assumption that the program is linked against libc.  Stop this.
  139 #
  140 CFLAGS+=        -ffreestanding
  141 
  142 #
  143 # GCC SSP support
  144 #
  145 .if ${MK_SSP} != "no" && ${MACHINE_CPUARCH} != "ia64" && \
  146     ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
  147 CFLAGS+=        -fstack-protector
  148 .endif

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