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/10.1/sys/conf/kern.mk 268882 2014-07-19 18:33:09Z 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 ${FORMAT_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 -Wno-error-unused-function \
   33                 ${NO_WFORMAT}
   34 .endif
   35 
   36 # External compilers may not support our format extensions.  Allow them
   37 # to be disabled.  WARNING: format checking is disabled in this case.
   38 .if ${MK_FORMAT_EXTENSIONS} == "no"
   39 NO_WFORMAT=             -Wno-format
   40 .else
   41 FORMAT_EXTENSIONS=      -fformat-extensions
   42 .endif
   43 
   44 #
   45 # On i386, do not align the stack to 16-byte boundaries.  Otherwise GCC 2.95
   46 # and above adds code to the entry and exit point of every function to align the
   47 # stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
   48 # per function call.  While the 16-byte alignment may benefit micro benchmarks,
   49 # it is probably an overall loss as it makes the code bigger (less efficient
   50 # use of code cache tag lines) and uses more stack (less efficient use of data
   51 # cache tag lines).  Explicitly prohibit the use of FPU, SSE and other SIMD
   52 # operations inside the kernel itself.  These operations are exclusively
   53 # reserved for user applications.
   54 #
   55 # gcc:
   56 # Setting -mno-mmx implies -mno-3dnow
   57 # Setting -mno-sse implies -mno-sse2, -mno-sse3 and -mno-ssse3
   58 #
   59 # clang:
   60 # Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
   61 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
   62 #
   63 .if ${MACHINE_CPUARCH} == "i386"
   64 .if ${COMPILER_TYPE} != "clang"
   65 CFLAGS+=        -mno-align-long-strings -mpreferred-stack-boundary=2
   66 .else
   67 CFLAGS+=        -mno-aes -mno-avx
   68 .endif
   69 CFLAGS+=        -mno-mmx -mno-sse -msoft-float
   70 INLINE_LIMIT?=  8000
   71 .endif
   72 
   73 .if ${MACHINE_CPUARCH} == "arm"
   74 INLINE_LIMIT?=  8000
   75 .endif
   76 
   77 #
   78 # For IA-64, we use r13 for the kernel globals pointer and we only use
   79 # a very small subset of float registers for integer divides.
   80 #
   81 .if ${MACHINE_CPUARCH} == "ia64"
   82 CFLAGS+=        -ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata
   83 INLINE_LIMIT?=  15000
   84 .endif
   85 
   86 #
   87 # For sparc64 we want the medany code model so modules may be located
   88 # anywhere in the 64-bit address space.  We also tell GCC to use floating
   89 # point emulation.  This avoids using floating point registers for integer
   90 # operations which it has a tendency to do.
   91 #
   92 .if ${MACHINE_CPUARCH} == "sparc64"
   93 .if ${COMPILER_TYPE} == "clang"
   94 CFLAGS+=        -mcmodel=large -fno-dwarf2-cfi-asm
   95 .else
   96 CFLAGS+=        -mcmodel=medany -msoft-float
   97 .endif
   98 INLINE_LIMIT?=  15000
   99 .endif
  100 
  101 #
  102 # For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD
  103 # operations inside the kernel itself.  These operations are exclusively
  104 # reserved for user applications.
  105 #
  106 # gcc:
  107 # Setting -mno-mmx implies -mno-3dnow
  108 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3 and -mfpmath=387
  109 #
  110 # clang:
  111 # Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
  112 # Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
  113 # (-mfpmath= is not supported)
  114 #
  115 .if ${MACHINE_CPUARCH} == "amd64"
  116 .if ${COMPILER_TYPE} == "clang"
  117 CFLAGS+=        -mno-aes -mno-avx
  118 .endif
  119 CFLAGS+=        -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float \
  120                 -fno-asynchronous-unwind-tables
  121 INLINE_LIMIT?=  8000
  122 .endif
  123 
  124 #
  125 # For PowerPC we tell gcc to use floating point emulation.  This avoids using
  126 # floating point registers for integer operations which it has a tendency to do.
  127 # Also explicitly disable Altivec instructions inside the kernel.
  128 #
  129 .if ${MACHINE_CPUARCH} == "powerpc"
  130 CFLAGS+=        -msoft-float -mno-altivec
  131 INLINE_LIMIT?=  15000
  132 .endif
  133 
  134 #
  135 # Use dot symbols on powerpc64 to make ddb happy
  136 #
  137 .if ${MACHINE_ARCH} == "powerpc64"
  138 CFLAGS+=        -mcall-aixdesc
  139 .endif
  140 
  141 #
  142 # For MIPS we also tell gcc to use floating point emulation
  143 #
  144 .if ${MACHINE_CPUARCH} == "mips"
  145 CFLAGS+=        -msoft-float
  146 INLINE_LIMIT?=  8000
  147 .endif
  148 
  149 #
  150 # GCC 3.0 and above like to do certain optimizations based on the
  151 # assumption that the program is linked against libc.  Stop this.
  152 #
  153 CFLAGS+=        -ffreestanding
  154 
  155 #
  156 # GCC SSP support
  157 #
  158 .if ${MK_SSP} != "no" && ${MACHINE_CPUARCH} != "ia64" && \
  159     ${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
  160 CFLAGS+=        -fstack-protector
  161 .endif
  162 
  163 #
  164 # Add -gdwarf-2 when compiling -g
  165 #
  166 .if ${COMPILER_TYPE} == "clang" && ${CFLAGS:M-g} != "" && ${CFLAGS:M-gdwarf} == ""
  167 CFLAGS+=        -gdwarf-2
  168 .endif

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