diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/configure.ac b/configure.ac index df9f88049c7..d42a52941bd 100644 --- a/configure.ac +++ b/configure.ac @@ -176,7 +176,20 @@ esac dnl Add flags for gcc and g++ if test "x$GCC" = xyes; then - CFLAGS="$CFLAGS -Wall -Wmissing-prototypes -std=c99" + CFLAGS="$CFLAGS -Wall -std=c99" + + # Enable -Werror=implicit-function-declaration and + # -Werror=missing-prototypes, if available, or otherwise, just + # -Wmissing-prototypes. This is particularly useful to avoid + # generating a loadable driver module that has undefined symbols. + save_CFLAGS="$CFLAGS" + AC_MSG_CHECKING([whether $CC supports -Werror=missing-prototypes]) + CFLAGS="$CFLAGS -Werror=implicit-function-declaration" + CFLAGS="$CFLAGS -Werror=missing-prototypes" + AC_LINK_IFELSE([AC_LANG_PROGRAM()], + AC_MSG_RESULT([yes]), + [CFLAGS="$save_CFLAGS -Wmissing-prototypes"; + AC_MSG_RESULT([no])]); # Enable -fvisibility=hidden if using a gcc that supports it save_CFLAGS="$CFLAGS" |