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/9.1/sys/conf/kern.mk 234238 2012-04-13 21:47:14Z 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 ${MK_CLANG_IS_CC} != "no" || ${CC:T:Mclang} == "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 # Several other warnings which might be useful in some cases, but not severe
   28 # enough to error out the whole kernel build.  Display them anyway, so there is
   29 # some incentive to fix them eventually.
   30 CWARNEXTRA?=    -Wno-error-tautological-compare -Wno-error-empty-body \
   31                 -Wno-error-parentheses-equality
   32 .endif
   33 
   34 #
   35 # On i386, do not align the stack to 16-byte boundaries.  Otherwise GCC 2.95
   36 # and above adds code to the entry and exit point of every function to align the
   37 # stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
   38 # per function call.  While the 16-byte alignment may benefit micro benchmarks,
   39 # it is probably an overall loss as it makes the code bigger (less efficient
   40 # use of code cache tag lines) and uses more stack (less efficient use of data
   41 # cache tag lines).  Explicitly prohibit the use of FPU, SSE and other SIMD
   42 # operations inside the kernel itself.  These operations are exclusively
   43 # reserved for user applications.
   44 #
   45 # gcc:
   46 # Setting -mno-mmx implies -mno-3dnow
   47 # Setting -mno-sse implies -mno-sse2, -mno-sse3 and -mno-ssse3
   48 #
   49 # clang:
   50 # Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
   51 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
   52 #
   53 .if ${MACHINE_CPUARCH} == "i386"
   54 .if ${MK_CLANG_IS_CC} == "no" && ${CC:T:Mclang} != "clang"
   55 CFLAGS+=        -mno-align-long-strings -mpreferred-stack-boundary=2
   56 .else
   57 CFLAGS+=        -mno-aes -mno-avx
   58 .endif
   59 CFLAGS+=        -mno-mmx -mno-sse -msoft-float
   60 INLINE_LIMIT?=  8000
   61 .endif
   62 
   63 .if ${MACHINE_CPUARCH} == "arm"
   64 INLINE_LIMIT?=  8000
   65 .endif
   66 
   67 #
   68 # For IA-64, we use r13 for the kernel globals pointer and we only use
   69 # a very small subset of float registers for integer divides.
   70 #
   71 .if ${MACHINE_CPUARCH} == "ia64"
   72 CFLAGS+=        -ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata
   73 INLINE_LIMIT?=  15000
   74 .endif
   75 
   76 #
   77 # For sparc64 we want the medany code model so modules may be located
   78 # anywhere in the 64-bit address space.  We also tell GCC to use floating
   79 # point emulation.  This avoids using floating point registers for integer
   80 # operations which it has a tendency to do.
   81 #
   82 .if ${MACHINE_CPUARCH} == "sparc64"
   83 CFLAGS+=        -mcmodel=medany -msoft-float
   84 INLINE_LIMIT?=  15000
   85 .endif
   86 
   87 #
   88 # For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD
   89 # operations inside the kernel itself.  These operations are exclusively
   90 # reserved for user applications.
   91 #
   92 # gcc:
   93 # Setting -mno-mmx implies -mno-3dnow
   94 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3 and -mfpmath=387
   95 #
   96 # clang:
   97 # Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
   98 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
   99 # (-mfpmath= is not supported)
  100 #
  101 .if ${MACHINE_CPUARCH} == "amd64"
  102 .if ${MK_CLANG_IS_CC} != "no" || ${CC:T:Mclang} == "clang"
  103 CFLAGS+=        -mno-aes -mno-avx
  104 .endif
  105 CFLAGS+=        -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float \
  106                 -fno-asynchronous-unwind-tables
  107 INLINE_LIMIT?=  8000
  108 .endif
  109 
  110 #
  111 # For PowerPC we tell gcc to use floating point emulation.  This avoids using
  112 # floating point registers for integer operations which it has a tendency to do.
  113 # Also explicitly disable Altivec instructions inside the kernel.
  114 #
  115 .if ${MACHINE_CPUARCH} == "powerpc"
  116 CFLAGS+=        -msoft-float -mno-altivec
  117 INLINE_LIMIT?=  15000
  118 .endif
  119 
  120 #
  121 # Use dot symbols on powerpc64 to make ddb happy
  122 #
  123 .if ${MACHINE_ARCH} == "powerpc64"
  124 CFLAGS+=        -mcall-aixdesc
  125 .endif
  126 
  127 #
  128 # For MIPS we also tell gcc to use floating point emulation
  129 #
  130 .if ${MACHINE_CPUARCH} == "mips"
  131 CFLAGS+=        -msoft-float
  132 INLINE_LIMIT?=  8000
  133 .endif
  134 
  135 #
  136 # GCC 3.0 and above like to do certain optimizations based on the
  137 # assumption that the program is linked against libc.  Stop this.
  138 #
  139 CFLAGS+=        -ffreestanding
  140 
  141 #
  142 # GCC SSP support
  143 #
  144 .if ${MK_SSP} != "no" && ${MACHINE_CPUARCH} != "ia64" && \
  145     ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
  146 CFLAGS+=        -fstack-protector
  147 .endif
  148 
  149 #
  150 # Enable CTF conversation on request
  151 #
  152 .if defined(WITH_CTF)
  153 .undef NO_CTF
  154 .endif

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