diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 56 |
1 files changed, 54 insertions, 2 deletions
diff --git a/configure.ac b/configure.ac index a48b13ea..107762fc 100644 --- a/configure.ac +++ b/configure.ac @@ -136,13 +136,65 @@ CFLAGS="$old_CFLAGS"]) AS_IF([test "x$ac_cv_c99" != xyes], AC_MSG_ERROR([gcc with GNU99 support required])) +AC_CACHE_CHECK([whether gcc supports -fPIC], ac_cv_fpic, [dnl +save_CFLAGS="$CFLAGS" +CFLAGS="$save_CFLAGS -fPIC -Werror" +AC_COMPILE_IFELSE([AC_LANG_SOURCE()], ac_cv_fpic=yes, ac_cv_fpic=no) +CFLAGS="$save_CFLAGS" +]) +if test "$ac_cv_fpic" = "yes"; then + fpic_CFLAGS="-fPIC" +else + fpic_CFLAGS="" +fi +AC_SUBST([fpic_CFLAGS]) + +AC_CACHE_CHECK([whether gcc supports -fPIE], ac_cv_fpie, [dnl +save_CFLAGS="$CFLAGS" +CFLAGS="$save_CFLAGS -fPIE -Werror" +AC_COMPILE_IFELSE([AC_LANG_SOURCE()], ac_cv_fpie=yes, ac_cv_fpie=no) +CFLAGS="$save_CFLAGS" +]) +if test "$ac_cv_fpie" = "yes"; then + fpie_CFLAGS="-fPIE" +else + fpie_CFLAGS="" +fi +AC_SUBST([fpie_CFLAGS]) + +dso_LDFLAGS="-shared" + +ZDEFS_LDFLAGS="-Wl,-z,defs" +AC_CACHE_CHECK([whether gcc supports $ZDEFS_LDFLAGS], ac_cv_zdefs, [dnl +save_LDFLAGS="$LDFLAGS" +LDFLAGS="$ZDEFS_LDFLAGS $save_LDFLAGS" +AC_LINK_IFELSE([AC_LANG_PROGRAM()], ac_cv_zdefs=yes, ac_cv_zdefs=no) +LDFLAGS="$save_LDFLAGS" +]) +if test "$ac_cv_zdefs" = "yes"; then + dso_LDFLAGS="$dso_LDFLAGS $ZDEFS_LDFLAGS" +fi + +ZRELRO_LDFLAGS="-Wl,-z,relro" +AC_CACHE_CHECK([whether gcc supports $ZRELRO_LDFLAGS], ac_cv_zrelro, [dnl +save_LDFLAGS="$LDFLAGS" +LDFLAGS="$ZRELRO_LDFLAGS $save_LDFLAGS" +AC_LINK_IFELSE([AC_LANG_PROGRAM()], ac_cv_zrelro=yes, ac_cv_zrelro=no) +LDFLAGS="$save_LDFLAGS" +]) +if test "$ac_cv_zrelro" = "yes"; then + dso_LDFLAGS="$dso_LDFLAGS $ZRELRO_LDFLAGS" +fi + +AC_SUBST([dso_LDFLAGS]) + AC_CACHE_CHECK([for __thread support], ac_cv_tls, [dnl # Use the same flags that we use for our DSOs, so the test is representative. # Some old compiler/linker/libc combinations fail some ways and not others. save_CFLAGS="$CFLAGS" save_LDFLAGS="$LDFLAGS" -CFLAGS="-fPIC $CFLAGS" -LDFLAGS="-shared -Wl,-z,defs,-z,relro $LDFLAGS" +CFLAGS="$fpic_CFLAGS $CFLAGS" +LDFLAGS="$dso_LDFLAGS $LDFLAGS" AC_LINK_IFELSE([dnl AC_LANG_PROGRAM([[#include <stdlib.h> #undef __thread |