From 7cfebce15228c88ee122edb8ba575f9a609e36f4 Mon Sep 17 00:00:00 2001 From: Bryce Harrington Date: Tue, 23 Sep 2014 12:40:25 -0700 Subject: [PATCH] build: Fix float endian configure test when using clang -O4 When using clang -O4, the compiled test object is output in bitcode format rather than as an ELF object, so when we grep the test value from the object it fails. To work around this, go ahead and link the test object into an executable, and then grep against this native binary instead of the compiler's intermediary object. We need to add __attribute__((used)) to ensure the d variable doesn't get optimized out during linking, since it's not referenced in the test's main(). Patch authored by cmuelle8 Reviewed-by: Bryce Harrington Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=63310 --- build/aclocal.float.m4 | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/build/aclocal.float.m4 b/build/aclocal.float.m4 index 18ec31618..bc0a91c60 100644 --- a/build/aclocal.float.m4 +++ b/build/aclocal.float.m4 @@ -24,16 +24,17 @@ AC_DEFUN([AX_C_FLOAT_WORDS_BIGENDIAN], # is found, the user is instructed to specify the ordering. ax_cv_c_float_words_bigendian=unknown -AC_COMPILE_IFELSE([AC_LANG_SOURCE([[ +AC_LINK_IFELSE([AC_LANG_SOURCE([[ -double d = 90904234967036810337470478905505011476211692735615632014797120844053488865816695273723469097858056257517020191247487429516932130503560650002327564517570778480236724525140520121371739201496540132640109977779420565776568942592.0; +double d __attribute__((used)) = 90904234967036810337470478905505011476211692735615632014797120844053488865816695273723469097858056257517020191247487429516932130503560650002327564517570778480236724525140520121371739201496540132640109977779420565776568942592.0; +int main() { return 0; } ]])], [ -if strings - conftest.$ac_objext | grep noonsees >/dev/null ; then +if strings - conftest | grep noonsees >/dev/null ; then ax_cv_c_float_words_bigendian=yes fi -if strings - conftest.$ac_objext | grep seesnoon >/dev/null ; then +if strings - conftest | grep seesnoon >/dev/null ; then if test "$ax_cv_c_float_words_bigendian" = unknown; then ax_cv_c_float_words_bigendian=no else