After the removal of the dri driver link test, this should help avoid
the original problem that it was designed to catch: The warning about
a missing prototype due to typoing a function name scrolling by in the
Mesa build spew, and you not noticing until you try to run an
application and it falls back to swrast.
---
configure.ac | 15 ++++++++++++++-
1 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/configure.ac b/configure.ac
index 06d400f..0cd8421 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"
--
1.7.7.3
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