ENH: do not use O2 g as default flags

1 files changed, 34 insertions, 23 deletions

diff --git a/configure b/configure
index 1a8e5d936f..fe7214f3bf 100755
--- a/configure
+++ b/configure
@@ -530,10 +530,16 @@ CMAKE_CONFIG_DIR=`pwd`
 #
 # check for some programs we use
 #
+
+# save the CFLAGS and CXXFLAGS specified by the user
+save_CFLAGS=$CFLAGS
+save_CXXFLAGS=$CXXFLAGS
+
+# let autoconf find cc and CC, it will try to add -g -O2 to CFLAGS and CXXFLAGS
 # Extract the first word of "gcc", so it can be a program name with args.
 set dummy gcc; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:537: checking for $ac_word" >&5
+echo "configure:543: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -563,7 +569,7 @@ if test -z "$CC"; then
   # Extract the first word of "cc", so it can be a program name with args.
 set dummy cc; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:567: checking for $ac_word" >&5
+echo "configure:573: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -614,7 +620,7 @@ fi
       # Extract the first word of "cl", so it can be a program name with args.
 set dummy cl; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:618: checking for $ac_word" >&5
+echo "configure:624: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CC'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -646,7 +652,7 @@ fi
 fi
 
 echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works""... $ac_c" 1>&6
-echo "configure:650: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
+echo "configure:656: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) works" >&5
 
 ac_ext=c
 # CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
@@ -657,12 +663,12 @@ cross_compiling=$ac_cv_prog_cc_cross
 
 cat > conftest.$ac_ext << EOF
 
-#line 661 "configure"
+#line 667 "configure"
 #include "confdefs.h"
 
 main(){return(0);}
 EOF
-if { (eval echo configure:666: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:672: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   ac_cv_prog_cc_works=yes
   # If we can't run a trivial program, we are probably using a cross compiler.
   if (./conftest; exit) 2>/dev/null; then
@@ -688,12 +694,12 @@ if test $ac_cv_prog_cc_works = no; then
   { echo "configure: error: installation or configuration problem: C compiler cannot create executables." 1>&2; exit 1; }
 fi
 echo $ac_n "checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler""... $ac_c" 1>&6
-echo "configure:692: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
+echo "configure:698: checking whether the C compiler ($CC $CFLAGS $LDFLAGS) is a cross-compiler" >&5
 echo "$ac_t""$ac_cv_prog_cc_cross" 1>&6
 cross_compiling=$ac_cv_prog_cc_cross
 
 echo $ac_n "checking whether we are using GNU C""... $ac_c" 1>&6
-echo "configure:697: checking whether we are using GNU C" >&5
+echo "configure:703: checking whether we are using GNU C" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_gcc'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -702,7 +708,7 @@ else
   yes;
 #endif
 EOF
-if { ac_try='${CC-cc} -E conftest.c'; { (eval echo configure:706: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
+if { ac_try='${CC-cc} -E conftest.c'; { (eval echo configure:712: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
   ac_cv_prog_gcc=yes
 else
   ac_cv_prog_gcc=no
@@ -721,7 +727,7 @@ ac_test_CFLAGS="${CFLAGS+set}"
 ac_save_CFLAGS="$CFLAGS"
 CFLAGS=
 echo $ac_n "checking whether ${CC-cc} accepts -g""... $ac_c" 1>&6
-echo "configure:725: checking whether ${CC-cc} accepts -g" >&5
+echo "configure:731: checking whether ${CC-cc} accepts -g" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_cc_g'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -757,7 +763,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:761: checking for $ac_word" >&5
+echo "configure:767: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_CXX'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -789,7 +795,7 @@ test -n "$CXX" || CXX="gcc"
 
 
 echo $ac_n "checking whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works""... $ac_c" 1>&6
-echo "configure:793: checking whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works" >&5
+echo "configure:799: checking whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) works" >&5
 
 ac_ext=C
 # CXXFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options.
@@ -800,12 +806,12 @@ cross_compiling=$ac_cv_prog_cxx_cross
 
 cat > conftest.$ac_ext << EOF
 
-#line 804 "configure"
+#line 810 "configure"
 #include "confdefs.h"
 
 int main(){return(0);}
 EOF
-if { (eval echo configure:809: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:815: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   ac_cv_prog_cxx_works=yes
   # If we can't run a trivial program, we are probably using a cross compiler.
   if (./conftest; exit) 2>/dev/null; then
@@ -831,12 +837,12 @@ if test $ac_cv_prog_cxx_works = no; then
   { echo "configure: error: installation or configuration problem: C++ compiler cannot create executables." 1>&2; exit 1; }
 fi
 echo $ac_n "checking whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) is a cross-compiler""... $ac_c" 1>&6
-echo "configure:835: checking whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) is a cross-compiler" >&5
+echo "configure:841: checking whether the C++ compiler ($CXX $CXXFLAGS $LDFLAGS) is a cross-compiler" >&5
 echo "$ac_t""$ac_cv_prog_cxx_cross" 1>&6
 cross_compiling=$ac_cv_prog_cxx_cross
 
 echo $ac_n "checking whether we are using GNU C++""... $ac_c" 1>&6
-echo "configure:840: checking whether we are using GNU C++" >&5
+echo "configure:846: checking whether we are using GNU C++" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_gxx'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -845,7 +851,7 @@ else
   yes;
 #endif
 EOF
-if { ac_try='${CXX-g++} -E conftest.C'; { (eval echo configure:849: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
+if { ac_try='${CXX-g++} -E conftest.C'; { (eval echo configure:855: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then
   ac_cv_prog_gxx=yes
 else
   ac_cv_prog_gxx=no
@@ -864,7 +870,7 @@ ac_test_CXXFLAGS="${CXXFLAGS+set}"
 ac_save_CXXFLAGS="$CXXFLAGS"
 CXXFLAGS=
 echo $ac_n "checking whether ${CXX-g++} accepts -g""... $ac_c" 1>&6
-echo "configure:868: checking whether ${CXX-g++} accepts -g" >&5
+echo "configure:874: checking whether ${CXX-g++} accepts -g" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_cxx_g'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -896,6 +902,11 @@ else
 fi
 
 
+# restore the flags specified by the user and get rid of any flags
+# found by autoconf (we do not want -02 -g by default)
+CFLAGS=$save_CFLAGS
+CXXFLAGS=$save_CXXFLAGS
+
 fullSrcDir=`cd $srcdir; pwd`
 CMAKE_ROOT_DIR=$fullSrcDir
 
@@ -906,7 +917,7 @@ CMAKE_ROOT_DIR=$fullSrcDir
 # there are a few systems, like Next, where this doesn't work.
 
 echo $ac_n "checking system version (for dynamic loading)""... $ac_c" 1>&6
-echo "configure:910: checking system version (for dynamic loading)" >&5
+echo "configure:921: checking system version (for dynamic loading)" >&5
 if test -f /usr/lib/NextStep/software_version; then
   system=NEXTSTEP-`awk '/3/,/3/' /usr/lib/NextStep/software_version`
 else
@@ -961,7 +972,7 @@ fi
 # ansi stream files (without the .h)
 if test $ac_cv_prog_gxx = no; then
   echo $ac_n "checking ansi standard C++ stream headers ""... $ac_c" 1>&6
-echo "configure:965: checking ansi standard C++ stream headers " >&5 
+echo "configure:976: checking ansi standard C++ stream headers " >&5 
   rm -rf conftest.*
   cat > conftest.cc <<!
 #include <iostream>
@@ -980,7 +991,7 @@ fi
 # check to see if stl is in the std namespace
 if test $ac_cv_prog_gxx = no; then
   echo $ac_n "checking ansi standard namespace support ""... $ac_c" 1>&6
-echo "configure:984: checking ansi standard namespace support " >&5 
+echo "configure:995: checking ansi standard namespace support " >&5 
   rm -rf conftest.*
   cat > conftest.cc <<!
 #include <list>
@@ -1000,7 +1011,7 @@ fi
 # check to see if for scoping is supported
 if test $ac_cv_prog_gxx = no; then
   echo $ac_n "checking ansi for scope support ""... $ac_c" 1>&6
-echo "configure:1004: checking ansi for scope support " >&5 
+echo "configure:1015: checking ansi for scope support " >&5 
   rm -rf conftest.*
   cat > conftest.cc <<!
 void foo() { for(int i;;); for(int i;;); }
@@ -1022,7 +1033,7 @@ do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
 echo $ac_n "checking for $ac_word""... $ac_c" 1>&6
-echo "configure:1026: checking for $ac_word" >&5
+echo "configure:1037: checking for $ac_word" >&5
 if eval "test \"`echo '$''{'ac_cv_path_RUNMAKE'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else