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gcc and clang semantics imply certain -mno-* flags when other certain -mno-*

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flags are also specified. This change makes use of this behaviour and removes
unneeded -mno-* flags.

Note that clang does not yet enable AVX support for any CPU. However at some
point in the future it will and since we definitely want to disable it for the
kernel, we might as well add the -mno-avx flag now.

Submitted by:	arundel
This commit is contained in:
Rebecca Cran 2011-05-14 11:26:00 +00:00
parent d6415a7cf6
commit d1b9bdd11a
1 changed files with 28 additions and 5 deletions
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33
sys/conf/kern.mk
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@ -25,11 +25,21 @@ CWARNFLAGS?= -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes \
# operations inside the kernel itself. These operations are exclusively
# reserved for user applications.
#
# gcc:
# Setting -mno-mmx implies -mno-3dnow
# Setting -mno-sse implies -mno-sse2, -mno-sse3 and -mno-ssse3
#
# clang:
# Setting -mno-mmx implies -mno-3dnow, -mno-3dnowa, -mno-sse, -mno-sse2,
# -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
#
.if ${MACHINE_CPUARCH} == "i386"
.if ${CC:T:Mclang} != "clang"
CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2
CFLAGS+= -mno-align-long-strings -mpreferred-stack-boundary=2 -mno-sse
.else
CFLAGS+= -mno-aes -mno-avx
.endif
CFLAGS+= -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -msoft-float
CFLAGS+= -mno-mmx -msoft-float
INLINE_LIMIT?= 8000
.endif
@ -61,10 +71,23 @@ INLINE_LIMIT?= 15000
# operations inside the kernel itself. These operations are exclusively
# reserved for user applications.
#
# gcc:
# Setting -mno-mmx implies -mno-3dnow
# Setting -mno-sse implies -mno-sse2, -mno-sse3, -mno-ssse3 and -mfpmath=387
#
# clang:
# Setting -mno-mmx implies -mno-3dnow, -mno-3dnowa, -mno-sse, -mno-sse2,
# -mno-sse3, -mno-ssse3, -mno-sse41 and -mno-sse42
# (-mfpmath= is not supported)
#
.if ${MACHINE_CPUARCH} == "amd64"
CFLAGS+= -mcmodel=kernel -mno-red-zone \
-mfpmath=387 -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 \
-msoft-float -fno-asynchronous-unwind-tables
.if ${CC:T:Mclang} != "clang"
CFLAGS+= -mno-sse
.else
CFLAGS+= -mno-aes -mno-avx
.endif
CFLAGS+= -mcmodel=kernel -mno-red-zone -mno-mmx -msoft-float \
-fno-asynchronous-unwind-tables
INLINE_LIMIT?= 8000
.endif