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configure.ac: smarter way to handle -O2 -> -O3 default change

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We don't want to tack on -O3 if the user has specified, say,
CFLAGS='-g -O1' for debugging.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
H. Peter Anvin 2017-03-01 12:57:46 -08:00
parent 6980985eb9
commit 2d89477ef4
1 changed files with 8 additions and 4 deletions
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12
configure.ac
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@ -6,8 +6,10 @@ AC_CONFIG_HEADERS(config/config.h)
AC_PREFIX_PROGRAM(nasm)
dnl Checks for programs.
dnl Consider AC_USE_SYSTEM_EXTENSIONS if autoconf 2.61 is OK in the future
dnl Save initial CFLAGS, to see if -g -O2 came from configure or not
pa_init_cflags="$CFLAGS"
dnl Checks for programs and enable necessary CC extensions
AC_USE_SYSTEM_EXTENSIONS
AC_SYS_LARGEFILE
AC_PROG_CC
@ -16,8 +18,10 @@ AC_PROG_LN_S
AC_PROG_MAKE_SET
AC_PROG_INSTALL
dnl For gcc, at lest, use -O3
PA_ADD_CFLAGS([-O3])
dnl If the user did not specify a CFLAGS default, change default -O2 to -O3
if test x"$pa_init_cflags" = x; then
CFLAGS=`echo "$CFLAGS" | sed -e 's/-O2/-O3/'`
fi
dnl Check for library extension
PA_LIBEXT