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* configure.ac (CFLAGS): Prefer -g3 to -g if -g3 works

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and if the user has not specified CFLAGS.  -g3 simplifies
debugging, since it makes macros visible to the debugger.
This commit is contained in:
Paul Eggert 2012-08-25 21:37:40 -07:00
parent 2db8bdfcc8
commit 6e8aca60a8
2 changed files with 34 additions and 0 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2012-08-26 Paul Eggert <eggert@cs.ucla.edu>
* configure.ac (CFLAGS): Prefer -g3 to -g if -g3 works
and if the user has not specified CFLAGS. -g3 simplifies
debugging, since it makes macros visible to the debugger.
2012-08-25 Juanma Barranquero <lekktu@gmail.com>
* lib/makefile.w32-in ($(BLD)/execinfo.$(O)): Update dependencies.

28
configure.ac
View file

@ -577,6 +577,34 @@ fi
# Initialize gnulib right after choosing the compiler.
gl_EARLY
# It's helpful to have C macros available to GDB, so prefer -g3 to -g
# if -g3 works and the user does not specify CFLAGS.
# This test must follow gl_EARLY; otherwise AC_LINK_IFELSE complains.
if test "$ac_test_CFLAGS" != set; then
case $CFLAGS in
'-g')
emacs_g3_CFLAGS='-g3';;
'-g -O2')
emacs_g3_CFLAGS='-g3 -O2';;
*)
emacs_g3_CFLAGS='';;
esac
if test -n "$emacs_g3_CFLAGS"; then
emacs_save_CFLAGS=$CFLAGS
CFLAGS=$emacs_g3_CFLAGS
AC_CACHE_CHECK([whether $CC accepts $emacs_g3_CFLAGS],
[emacs_cv_prog_cc_g3],
[AC_LINK_IFELSE([AC_LANG_PROGRAM()],
[emacs_cv_prog_cc_g3=yes],
[emacs_cv_prog_cc_g3=no])])
if test $emacs_cv_prog_cc_g3 = yes; then
CFLAGS=$emacs_g3_CFLAGS
else
CFLAGS=$emacs_save_CFLAGS
fi
fi
fi
AC_ARG_ENABLE([gcc-warnings],
[AS_HELP_STRING([--enable-gcc-warnings],
[turn on lots of GCC warnings. This is intended for