diff options
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 78203343..a8855684 100644 --- a/configure.ac +++ b/configure.ac @@ -35,9 +35,77 @@ AC_SYS_LARGEFILE pkgconfigdir=${libdir}/pkgconfig AC_SUBST(pkgconfigdir) + +dnl =========================================================================== +dnl check compiler flags +AC_DEFUN([LIBDRM_CC_TRY_FLAG], [ + AC_MSG_CHECKING([whether $CC supports $1]) + + libdrm_save_CFLAGS="$CFLAGS" + CFLAGS="$CFLAGS $1" + + AC_COMPILE_IFELSE([ ], [libdrm_cc_flag=yes], [libdrm_cc_flag=no]) + CFLAGS="$libdrm_save_CFLAGS" + + if test "x$libdrm_cc_flag" = "xyes"; then + ifelse([$2], , :, [$2]) + else + ifelse([$3], , :, [$3]) + fi + AC_MSG_RESULT([$libdrm_cc_flag]) +]) + +dnl Use lots of warning flags with with gcc and compatible compilers + +dnl Note: if you change the following variable, the cache is automatically +dnl skipped and all flags rechecked. So there's no need to do anything +dnl else. If for any reason you need to force a recheck, just change +dnl MAYBE_WARN in an ignorable way (like adding whitespace) + +MAYBE_WARN="-Wall -Wextra \ +-Wsign-compare -Werror-implicit-function-declaration \ +-Wpointer-arith -Wwrite-strings -Wstrict-prototypes \ +-Wmissing-prototypes -Wmissing-declarations -Wnested-externs \ +-Wpacked -Wswitch-enum -Wmissing-format-attribute \ +-Wstrict-aliasing=2 -Winit-self -Wunsafe-loop-optimizations \ +-Wdeclaration-after-statement -Wold-style-definition \ +-Wno-missing-field-initializers -Wno-unused-parameter \ +-Wno-attributes -Wno-long-long -Winline" + +# invalidate cached value if MAYBE_WARN has changed +if test "x$libdrm_cv_warn_maybe" != "x$MAYBE_WARN"; then + unset libdrm_cv_warn_cflags +fi +AC_CACHE_CHECK([for supported warning flags], libdrm_cv_warn_cflags, [ + echo + WARN_CFLAGS="" + + # Some warning options are not supported by all versions of + # gcc, so test all desired options against the current + # compiler. + # + # Note that there are some order dependencies + # here. Specifically, an option that disables a warning will + # have no net effect if a later option then enables that + # warnings, (perhaps implicitly). So we put some grouped + # options (-Wall and -Wextra) up front and the -Wno options + # last. + + for W in $MAYBE_WARN; do + LIBDRM_CC_TRY_FLAG([$W], [WARN_CFLAGS="$WARN_CFLAGS $W"]) + done + + libdrm_cv_warn_cflags=$WARN_CFLAGS + libdrm_cv_warn_maybe=$MAYBE_WARN + + AC_MSG_CHECKING([which warning flags were supported])]) +WARN_CFLAGS="$libdrm_cv_warn_cflags" + +AC_SUBST(WARN_CFLAGS) AC_OUTPUT([ Makefile libdrm/Makefile + libdrm/intel/Makefile shared-core/Makefile tests/Makefile libdrm.pc]) |