Allow to use libgcc instead of libtcc1

This patch adds a switch --with-libgcc to configure.
When passed it prevents libtcc1.a from being built and links to
/lib/libgcc_s.so.1 instead of PREFIX/lib/tcc/libtcc1.a.

It will work on ARM when using libgcc from GCC >= 4.2.0.
Prior versions don't have the __floatun[sd]i[sdx]f functions.

It won't work on i386 because of two missing symbols emitted when
floats are cast to integers, but users can provide those symbols
(global short constants) in their code if needed.

  Daniel

1 files changed, 9 insertions, 0 deletions

diff --git a/configure b/configure
index 8517485..63328cc 100755
--- a/configure
+++ b/configure
@@ -19,6 +19,7 @@ TMPH="${TMPDIR1}/tcc-conf-${RANDOM}-$$-${RANDOM}.h"
 
 # default parameters
 build_cross="no"
+use_libgcc="no"
 prefix=""
 execprefix=""
 bindir=""
@@ -127,6 +128,8 @@ for opt do
   ;; 
   --enable-cross) build_cross="yes"
   ;;
+  --with-libgcc) use_libgcc="yes"
+  ;;
   esac
 done
 
@@ -224,6 +227,7 @@ echo "  --cross-prefix=PREFIX    use PREFIX for compile tools [$cross_prefix]"
 echo "  --sysroot=PREFIX         prepend PREFIX to library/include paths []"
 echo "  --cc=CC                  use C compiler CC [$cc]"
 echo "  --make=MAKE              use specified make [$make]"
+echo "  --with-libgcc            use /lib/libgcc_s.so.1 instead of libtcc1.a"
 echo ""
 #echo "NOTE: The object files are build at the place where configure is launched"
 exit 1
@@ -279,6 +283,7 @@ echo "CPU              $cpu"
 echo "Big Endian       $bigendian"
 echo "gprof enabled    $gprof"
 echo "cross compilers  $build_cross"
+echo "use libgcc       $use_libgcc"
 
 echo "Creating config.mak and config.h"
 
@@ -345,6 +350,10 @@ fi
 if test "$build_cross" = "yes" ; then
   echo "CONFIG_CROSS=yes" >> config.mak
 fi
+if test "$use_libgcc" = "yes" ; then
+  echo "#define CONFIG_USE_LIBGCC" >> $TMPH
+  echo "CONFIG_USE_LIBGCC=yes" >> config.mak
+fi
 version=`head $source_path/VERSION`
 echo "VERSION=$version" >>config.mak
 echo "#define TCC_VERSION \"$version\"" >> $TMPH