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Remove check for clang and expand the comment. Newer versions of gcc

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generate dwarf4 by default as well, so always force dwarf2 when
generating debugging data. It is harmless on older versions of both
clang and gcc, but required on newer ones.
This commit is contained in:
Warner Losh 2014-04-01 14:24:20 +00:00
parent fffba3dbc2
commit 647a9d043b
1 changed files with 6 additions and 4 deletions
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10
sys/conf/kern.mk
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@ -164,10 +164,12 @@ CFLAGS+= -fstack-protector
.endif
#
# Add -gdwarf-2 when compiling -g on clang. The default starting in v3.4
# is to generate DWARF version 4. However, our tools don't cope well with
# DWARF 4, so force it to genereate DWARF2, which they understand.
# Add -gdwarf-2 when compiling -g. The default starting in clang v3.4
# and gcc 4.8 is to generate DWARF version 4. However, our tools don't
# cope well with DWARF 4, so force it to genereate DWARF2, which they
# understand. Do this unconditionally as it is harmless when not needed,
# but critical for these newer versions.
#
.if ${COMPILER_TYPE} == "clang" && ${CFLAGS:M-g} != "" && ${CFLAGS:M-gdwarf*} == ""
.if ${CFLAGS:M-g} != "" && ${CFLAGS:M-gdwarf*} == ""
CFLAGS+= -gdwarf-2
.endif