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compile with -fno-omit-frame-pointer

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By default, depending on the version, gcc can reuse the frame pointer register.
This is a micro-optimization that might help on some very old x86 processors.
However, it also makes dynamic tracing less useful because the stacks cannot
be easily observed.

This rule change instructs gcc to use the -fno-omit-frame-pointer option
when compiling.

Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Richard Elling <Richard.Elling@RichardElling.com>
Closes #8617
This commit is contained in:
Richard Elling
2019-04-14 11:04:54 -07:00
committed by Brian Behlendorf
parent 7dcd318832
commit d5d2ef2b26
3 changed files with 23 additions and 0 deletions
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config/always-compiler-options.m4
+21
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@@ -139,3 +139,24 @@ AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_UNUSED_BUT_SET_VARIABLE], [
CFLAGS="$saved_flags"
AC_SUBST([NO_UNUSED_BUT_SET_VARIABLE])
])
dnl #
dnl # Check if gcc supports -fno-omit-frame-pointer option.
dnl #
AC_DEFUN([ZFS_AC_CONFIG_ALWAYS_CC_NO_OMIT_FRAME_POINTER], [
AC_MSG_CHECKING([whether $CC supports -fno-omit-frame-pointer])
saved_flags="$CFLAGS"
CFLAGS="$CFLAGS -fno-omit-frame-pointer"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [])], [
NO_OMIT_FRAME_POINTER=-fno-omit-frame-pointer
AC_MSG_RESULT([yes])
], [
NO_OMIT_FRAME_POINTER=
AC_MSG_RESULT([no])
])
CFLAGS="$saved_flags"
AC_SUBST([NO_OMIT_FRAME_POINTER])
])