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autoconf: Sane --enable-debug defaults. 

Don't optimize at all when --enable-debug is supplied. This makes sure
that nothing is optimized out.
This commit is contained in:
Carl Dong 2019-07-22 11:06:01 -04:00 committed by Jack Grigg
parent a8780a982e
commit 81ddf862f7
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GPG Key ID: 9E8255172BBF9898
1 changed files with 4 additions and 7 deletions
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11
configure.ac
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@ -160,7 +160,7 @@ AM_CONDITIONAL(ENABLE_MAN, test "$enable_man" != no)
# Enable debug
AC_ARG_ENABLE([debug],
[AS_HELP_STRING([--enable-debug],
[use debug compiler flags and macros (default is no)])],
[use compiler flags and macros suited for debugging (default is no)])],
[enable_debug=$enableval],
[enable_debug=no])
@ -192,12 +192,9 @@ if test "x$enable_debug" = xyes; then
if test "x$CXXFLAGS_overridden" = xno; then
CXXFLAGS=""
fi
# Prefer -Og, fall back to -O0 if that is unavailable.
AX_CHECK_COMPILE_FLAG(
[-Og],
[[DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -Og"]],
[AX_CHECK_COMPILE_FLAG([-O0],[[DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -O0"]],,[[$CXXFLAG_WERROR]])],
[[$CXXFLAG_WERROR]])
# Disable all optimizations
AX_CHECK_COMPILE_FLAG([-O0], [[DEBUG_CXXFLAGS="$DEBUG_CXXFLAGS -O0"]],,[[$CXXFLAG_WERROR]])
# Prefer -g3, fall back to -g if that is unavailable.
AX_CHECK_COMPILE_FLAG(