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Add --enable-light-debug configure option (#7886) 

Change default debug build to use -O0 instead of -Og as the latter is
still not great debugging experience. Use -Og -gz, plus the new -ggdb1,
which together significantly cut down debug info size, to save CI cache
space, while still enabling -gdbbt tests to work.
This commit is contained in:
Geza Lore 2026-07-06 18:02:37 +01:00 committed by GitHub
parent 56b0b679c6
commit 39b646349f
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GPG Key ID: B5690EEEBB952194
2 changed files with 33 additions and 6 deletions
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2
ci/ci-build.bash
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@ -60,7 +60,7 @@ esac
################################################################################
# Configure
CONFIGURE_ARGS="--prefix=$OPT_PREFIX --enable-longtests"
CONFIGURE_ARGS="--prefix=$OPT_PREFIX --enable-longtests --enable-light-debug"
if [ "$OPT_CCWARN" = 1 ]; then
CONFIGURE_ARGS="$CONFIGURE_ARGS --enable-ccwarn"
fi

37
configure.ac
View File

@ -129,6 +129,21 @@ AC_ARG_ENABLE([dev-gcov],
AC_SUBST(CFG_WITH_DEV_GCOV)
AC_MSG_RESULT($CFG_WITH_DEV_GCOV)
# Flag to reduce the debug info in the debug executable to minimize its size
AC_MSG_CHECKING(whether to reduce debug info in the debug executable)
AC_ARG_ENABLE([light-debug],
[AS_HELP_STRING([--enable-light-debug],
[Reduce the amount of debug information in the debug
Verilator executable to minimize its size. Enable
slight optimization. Enough for backtraces only.])],
[case "${enableval}" in
yes) CFG_WITH_LIGHT_DEBUG=yes ;;
no) CFG_WITH_LIGHT_DEBUG=no ;;
*) AC_MSG_ERROR([bad value '${enableval}' for --enable-light-debug]) ;;
esac],
CFG_WITH_LIGHT_DEBUG=no)
AC_MSG_RESULT($CFG_WITH_LIGHT_DEBUG)
# Special Substitutions - CFG_WITH_DEFENV
AC_MSG_CHECKING(whether to use hardcoded paths)
AC_ARG_ENABLE([defenv],
@ -518,15 +533,27 @@ _MY_CXX_CHECK_OPT(CFG_CXXFLAGS_PARSER,-Wno-unused)
AC_SUBST(CFG_CXXFLAGS_PARSER)
# Flags for compiling the debug version of Verilator (in addition to above CFG_CXXFLAGS_SRC)
if test "$CFG_WITH_DEV_GCOV" = "no"; then # Do not optimize for the coverage build
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DBG,-Og)
if test "$CFG_WITH_LIGHT_DEBUG" = "yes"; then
# Slight optimization and minimal compressed debug info. This is enough for
# --gdb/--gdbbt backtraces, but omits the bulk of the debug info, which
# significantly reduces object file sizes. For CI or release builds.
if test "$CFG_WITH_DEV_GCOV" = "no"; then # Do not optimize for the coverage build
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DBG,-Og)
fi
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DBG,-ggdb1)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DBG,-fdebug-info-for-profiling) # For fully-qualified names with clang
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DBG,-gz)
else
# Full debug: no optimization, full debug info, for development.
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DBG,-O0)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DBG,-ggdb)
fi
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DBG,-ggdb)
_MY_CXX_CHECK_OPT(CFG_CXXFLAGS_DBG,-gz)
AC_SUBST(CFG_CXXFLAGS_DBG)
# Flags for linking the debug version of Verilator (in addition to above CFG_LDFLAGS_SRC)
_MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_DBG,-gz)
if test "$CFG_WITH_LIGHT_DEBUG" = "yes"; then
_MY_LDLIBS_CHECK_OPT(CFG_LDFLAGS_DBG,-gz)
fi
AC_SUBST(CFG_LDFLAGS_DBG)
# Flags for compiling the optimized version of Verilator (in addition to above CFG_CXXFLAGS_SRC)