1999-08-28 00:22:10 +00:00
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# $FreeBSD$
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1996-10-08 22:10:49 +00:00
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2014-02-04 03:59:35 +00:00
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# Compat
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MK_FORMAT_EXTENSIONS?=no
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1996-10-08 22:10:49 +00:00
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#
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2011-05-24 09:01:56 +00:00
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# Warning flags for compiling the kernel and components of the kernel:
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1996-10-08 22:10:49 +00:00
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#
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2001-09-10 06:23:33 +00:00
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CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
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-Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual \
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2013-05-20 19:41:34 +00:00
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-Wundef -Wno-pointer-sign ${FORMAT_EXTENSIONS} \
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2011-12-23 13:50:33 +00:00
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-Wmissing-include-dirs -fdiagnostics-show-option \
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${CWARNEXTRA}
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1999-01-29 10:57:18 +00:00
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#
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# The following flags are next up for working on:
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2011-05-02 10:35:27 +00:00
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# -Wextra
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1999-01-27 22:53:58 +00:00
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2011-12-21 15:59:18 +00:00
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# Disable a few warnings for clang, since there are several places in the
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# kernel where fixing them is more trouble than it is worth, or where there is
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# a false positive.
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2012-09-13 16:00:46 +00:00
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.if ${COMPILER_TYPE} == "clang"
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2011-12-21 15:59:18 +00:00
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NO_WCONSTANT_CONVERSION= -Wno-constant-conversion
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2011-12-21 16:38:37 +00:00
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NO_WARRAY_BOUNDS= -Wno-array-bounds
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2011-12-21 17:01:13 +00:00
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NO_WSHIFT_COUNT_NEGATIVE= -Wno-shift-count-negative
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NO_WSHIFT_COUNT_OVERFLOW= -Wno-shift-count-overflow
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2011-12-30 01:54:45 +00:00
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NO_WUNUSED_VALUE= -Wno-unused-value
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2011-12-30 13:16:59 +00:00
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NO_WSELF_ASSIGN= -Wno-self-assign
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2012-02-21 21:20:52 +00:00
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NO_WFORMAT_SECURITY= -Wno-format-security
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2012-03-23 11:35:01 +00:00
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NO_WUNNEEDED_INTERNAL_DECL= -Wno-unneeded-internal-declaration
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2012-08-20 18:33:03 +00:00
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NO_WSOMETIMES_UNINITIALIZED= -Wno-error-sometimes-uninitialized
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2011-12-23 00:23:37 +00:00
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# Several other warnings which might be useful in some cases, but not severe
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# enough to error out the whole kernel build. Display them anyway, so there is
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# some incentive to fix them eventually.
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2011-12-24 18:57:42 +00:00
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CWARNEXTRA?= -Wno-error-tautological-compare -Wno-error-empty-body \
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2014-02-16 19:44:07 +00:00
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-Wno-error-parentheses-equality -Wno-unused-function \
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${NO_WFORMAT}
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2013-05-15 13:04:10 +00:00
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.endif
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# External compilers may not support our format extensions. Allow them
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# to be disabled. WARNING: format checking is disabled in this case.
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.if ${MK_FORMAT_EXTENSIONS} == "no"
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NO_WFORMAT= -Wno-format
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.else
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2013-05-20 19:41:34 +00:00
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FORMAT_EXTENSIONS= -fformat-extensions
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2011-12-21 15:59:18 +00:00
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.endif
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1999-11-17 07:30:35 +00:00
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#
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2011-05-02 10:35:27 +00:00
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# On i386, do not align the stack to 16-byte boundaries. Otherwise GCC 2.95
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# and above adds code to the entry and exit point of every function to align the
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1999-11-17 07:30:35 +00:00
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# stack to 16-byte boundaries -- thus wasting approximately 12 bytes of stack
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2011-05-02 10:35:27 +00:00
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# per function call. While the 16-byte alignment may benefit micro benchmarks,
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2000-04-24 08:50:15 +00:00
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# it is probably an overall loss as it makes the code bigger (less efficient
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1999-11-17 07:30:35 +00:00
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# use of code cache tag lines) and uses more stack (less efficient use of data
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2011-05-02 10:35:27 +00:00
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# cache tag lines). Explicitly prohibit the use of FPU, SSE and other SIMD
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2005-03-31 22:53:58 +00:00
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# operations inside the kernel itself. These operations are exclusively
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# reserved for user applications.
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1999-11-17 07:30:35 +00:00
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#
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2011-05-14 11:26:00 +00:00
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# gcc:
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# Setting -mno-mmx implies -mno-3dnow
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# Setting -mno-sse implies -mno-sse2, -mno-sse3 and -mno-ssse3
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#
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# clang:
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2012-03-13 19:18:34 +00:00
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# Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
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# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
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2011-05-14 11:26:00 +00:00
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#
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2011-04-19 18:09:21 +00:00
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.if ${MACHINE_CPUARCH} == "i386"
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2012-09-13 16:00:46 +00:00
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.if ${COMPILER_TYPE} != "clang"
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2012-03-13 19:18:34 +00:00
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CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2
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2011-05-14 11:26:00 +00:00
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.else
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CFLAGS+= -mno-aes -mno-avx
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2010-07-22 18:47:41 +00:00
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.endif
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2012-03-13 19:18:34 +00:00
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CFLAGS+= -mno-mmx -mno-sse -msoft-float
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2004-03-03 09:35:06 +00:00
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INLINE_LIMIT?= 8000
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1999-11-17 07:30:35 +00:00
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.endif
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2010-09-13 07:27:03 +00:00
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.if ${MACHINE_CPUARCH} == "arm"
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2004-05-14 13:35:46 +00:00
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INLINE_LIMIT?= 8000
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.endif
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2011-05-02 10:35:27 +00:00
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2000-10-16 20:04:52 +00:00
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#
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# For IA-64, we use r13 for the kernel globals pointer and we only use
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# a very small subset of float registers for integer divides.
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#
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2010-09-13 07:27:03 +00:00
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.if ${MACHINE_CPUARCH} == "ia64"
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2007-05-19 04:45:54 +00:00
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CFLAGS+= -ffixed-r13 -mfixed-range=f32-f127 -fpic #-mno-sdata
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2003-11-04 23:29:17 +00:00
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INLINE_LIMIT?= 15000
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2000-10-16 20:04:52 +00:00
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.endif
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2001-09-10 06:23:33 +00:00
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2003-02-28 06:49:59 +00:00
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#
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2011-12-24 12:28:23 +00:00
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# For sparc64 we want the medany code model so modules may be located
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# anywhere in the 64-bit address space. We also tell GCC to use floating
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2003-02-28 06:49:59 +00:00
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# point emulation. This avoids using floating point registers for integer
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# operations which it has a tendency to do.
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#
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2010-09-13 07:27:03 +00:00
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.if ${MACHINE_CPUARCH} == "sparc64"
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2014-02-23 17:25:53 +00:00
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.if ${COMPILER_TYPE} == "clang"
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CFLAGS+= -mcmodel=large -fno-dwarf2-cfi-asm
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.else
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2006-11-26 23:16:46 +00:00
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CFLAGS+= -mcmodel=medany -msoft-float
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2014-02-23 17:25:53 +00:00
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.endif
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2003-11-04 23:29:17 +00:00
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INLINE_LIMIT?= 15000
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2003-02-28 06:49:59 +00:00
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.endif
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2003-04-30 22:22:29 +00:00
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#
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2005-03-31 22:53:58 +00:00
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# For AMD64, we explicitly prohibit the use of FPU, SSE and other SIMD
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# operations inside the kernel itself. These operations are exclusively
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# reserved for user applications.
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2003-04-30 22:22:29 +00:00
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#
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2011-05-14 11:26:00 +00:00
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# gcc:
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# Setting -mno-mmx implies -mno-3dnow
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# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3 and -mfpmath=387
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#
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# clang:
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2012-03-13 19:18:34 +00:00
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# Setting -mno-mmx implies -mno-3dnow and -mno-3dnowa
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# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
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2011-05-14 11:26:00 +00:00
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# (-mfpmath= is not supported)
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#
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2010-09-13 07:27:03 +00:00
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.if ${MACHINE_CPUARCH} == "amd64"
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2012-09-13 16:00:46 +00:00
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.if ${COMPILER_TYPE} == "clang"
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2011-05-14 11:26:00 +00:00
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CFLAGS+= -mno-aes -mno-avx
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.endif
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2012-03-13 19:18:34 +00:00
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CFLAGS+= -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float \
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2011-05-14 11:26:00 +00:00
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-fno-asynchronous-unwind-tables
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2004-02-06 20:40:04 +00:00
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INLINE_LIMIT?= 8000
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2003-04-30 22:22:29 +00:00
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.endif
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2003-12-07 09:56:30 +00:00
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#
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# For PowerPC we tell gcc to use floating point emulation. This avoids using
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# floating point registers for integer operations which it has a tendency to do.
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2009-02-22 18:45:30 +00:00
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# Also explicitly disable Altivec instructions inside the kernel.
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2003-12-07 09:56:30 +00:00
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#
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2010-09-13 07:27:03 +00:00
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.if ${MACHINE_CPUARCH} == "powerpc"
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2009-02-22 18:45:30 +00:00
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CFLAGS+= -msoft-float -mno-altivec
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2003-12-07 09:56:30 +00:00
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INLINE_LIMIT?= 15000
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.endif
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2011-02-18 21:44:53 +00:00
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#
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# Use dot symbols on powerpc64 to make ddb happy
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#
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.if ${MACHINE_ARCH} == "powerpc64"
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CFLAGS+= -mcall-aixdesc
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.endif
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2008-04-29 11:28:10 +00:00
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#
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2010-01-09 17:21:36 +00:00
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# For MIPS we also tell gcc to use floating point emulation
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2008-04-29 11:28:10 +00:00
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#
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2010-09-13 07:27:03 +00:00
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.if ${MACHINE_CPUARCH} == "mips"
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2010-01-09 17:21:36 +00:00
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CFLAGS+= -msoft-float
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2009-03-03 18:53:47 +00:00
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INLINE_LIMIT?= 8000
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2008-04-29 11:28:10 +00:00
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.endif
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2001-09-10 06:23:33 +00:00
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#
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# GCC 3.0 and above like to do certain optimizations based on the
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# assumption that the program is linked against libc. Stop this.
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#
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CFLAGS+= -ffreestanding
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2008-06-25 21:33:28 +00:00
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#
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2011-05-02 10:35:27 +00:00
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# GCC SSP support
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2008-06-25 21:33:28 +00:00
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#
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2011-04-19 18:09:21 +00:00
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.if ${MK_SSP} != "no" && ${MACHINE_CPUARCH} != "ia64" && \
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${MACHINE_CPUARCH} != "arm" && ${MACHINE_CPUARCH} != "mips"
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2008-06-25 21:33:28 +00:00
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CFLAGS+= -fstack-protector
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.endif
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2014-03-25 22:08:31 +00:00
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#
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2014-03-25 22:32:13 +00:00
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# Add -gdwarf-2 when compiling -g on clang. The default starting in v3.4
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# is to generate DWARF version 4. However, our tools don't cope well with
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# DWARF 4, so force it to genereate DWARF2, which they understand.
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2014-03-25 22:08:31 +00:00
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#
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2014-03-25 22:32:13 +00:00
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.if ${COMPILER_TYPE} == "clang" && ${CFLAGS:M-g} != "" && ${CFLAGS:M-gdwarf*} == ""
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2014-03-25 22:08:31 +00:00
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CFLAGS+= -gdwarf-2
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.endif
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