d/freebsd-dev
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Automatically use the ELFv2 ABI on powerpc64 if supported by the compiler.

Browse Source 
This has the same effects on DDB working as -mcall=aixdesc, but also is
supported by clang and marginally improves kernel performance.

MFC after:	2 weeks
This commit is contained in:
Nathan Whitehorn 2017-11-25 21:44:23 +00:00
parent 2c50bafef5
commit 5d85170026
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=326202
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
sys/conf/kern.mk
View File

@ -172,11 +172,17 @@ CFLAGS.gcc+= -mno-spe
.endif
#
# Use dot symbols on powerpc64 to make ddb happy
# Use dot symbols (or, better, the V2 ELF ABI) on powerpc64 to make
# DDB happy. ELFv2, if available, has some other efficiency benefits.
#
.if ${MACHINE_ARCH} == "powerpc64"
.if ${COMPILER_VERSION} >= 40900
CFLAGS.gcc+= -mabi=elfv2
.else
CFLAGS.gcc+= -mcall-aixdesc
.endif
CFLAGS.clang+= -mabi=elfv2
.endif
#
# For MIPS we also tell gcc to use floating point emulation