diff options
Diffstat (limited to '')
| -rw-r--r-- | configure.ac | 54 |
1 files changed, 41 insertions, 13 deletions
diff --git a/configure.ac b/configure.ac index 1db7bc882..98de67893 100644 --- a/configure.ac +++ b/configure.ac @@ -1478,21 +1478,36 @@ AC_SUBST(W32SOCKLIBS) # AC_MSG_NOTICE([checking for cc features]) if test "$GCC" = yes; then - # Note that it is okay to use CFLAGS here because this are just + # Check whether gcc does not emit a diagnositc for unknow -Wno-* + # options. This is the case for gcc >= 4.6 + AC_MSG_CHECKING([if gcc ignores unknown -Wno-* options]) + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[ +#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 6 ) +#kickerror +#endif]],[])],[_gcc_silent_wno=yes],[_gcc_silent_wno=no]) + AC_MSG_RESULT($_gcc_silent_wno) + + # Note that it is okay to use CFLAGS here because these are just # warning options and the user should have a chance of overriding # them. if test "$USE_MAINTAINER_MODE" = "yes"; then CFLAGS="$CFLAGS -O3 -Wall -Wcast-align -Wshadow -Wstrict-prototypes" CFLAGS="$CFLAGS -Wformat -Wno-format-y2k -Wformat-security" - AC_MSG_CHECKING([if gcc supports -Wno-missing-field-initializers]) - _gcc_cflags_save=$CFLAGS - CFLAGS="-Wno-missing-field-initializers" - AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_wopt=yes,_gcc_wopt=no) - AC_MSG_RESULT($_gcc_wopt) - CFLAGS=$_gcc_cflags_save; + if test x"$_gcc_silent_wno" = xyes ; then + _gcc_wopt=yes + else + AC_MSG_CHECKING([if gcc supports -Wno-missing-field-initializers]) + _gcc_cflags_save=$CFLAGS + CFLAGS="-Wno-missing-field-initializers" + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], + [_gcc_wopt=yes],[_gcc_wopt=no]) + AC_MSG_RESULT($_gcc_wopt) + CFLAGS=$_gcc_cflags_save; + fi if test x"$_gcc_wopt" = xyes ; then CFLAGS="$CFLAGS -W -Wno-sign-compare -Wno-missing-field-initializers" fi + AC_MSG_CHECKING([if gcc supports -Wdeclaration-after-statement]) _gcc_cflags_save=$CFLAGS CFLAGS="-Wdeclaration-after-statement" @@ -1506,12 +1521,17 @@ if test "$GCC" = yes; then CFLAGS="$CFLAGS -Wall" fi - AC_MSG_CHECKING([if gcc supports -Wno-pointer-sign]) - _gcc_cflags_save=$CFLAGS - CFLAGS="-Wno-pointer-sign" - AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])],_gcc_psign=yes,_gcc_psign=no) - AC_MSG_RESULT($_gcc_psign) - CFLAGS=$_gcc_cflags_save; + if test x"$_gcc_silent_wno" = xyes ; then + _gcc_psign=yes + else + AC_MSG_CHECKING([if gcc supports -Wno-pointer-sign]) + _gcc_cflags_save=$CFLAGS + CFLAGS="-Wno-pointer-sign" + AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],[])], + [_gcc_psign=yes],[_gcc_psign=no]) + AC_MSG_RESULT($_gcc_psign) + CFLAGS=$_gcc_cflags_save; + fi if test x"$_gcc_psign" = xyes ; then CFLAGS="$CFLAGS -Wno-pointer-sign" fi @@ -1525,6 +1545,14 @@ if test "$GCC" = yes; then if test x"$_gcc_psign" = xyes ; then CFLAGS="$CFLAGS -Wpointer-arith" fi + + # The undocumented option -Wno-psabi suppresses the annoying + # "the ABI of passing union with long double has changed in GCC 4.4" + # which is emitted in estream-printf.c but entirely irrelvant + # because that union is local to the file. + if test x"$_gcc_silent_wno" = xyes ; then + CFLAGS="$CFLAGS -Wno-psabi" + fi fi |