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| author | Bryce Harrington <bryce@osg.samsung.com> | 2014-09-23 12:40:25 -0700 |
|---|---|---|
| committer | Bryce Harrington <bryce@osg.samsung.com> | 2014-09-23 12:40:25 -0700 |
| commit | 7cfebce15228c88ee122edb8ba575f9a609e36f4 (patch) | |
| tree | 08d484725ad02f1283f5e061f8ed69cf497e8f27 | |
| parent | 9a19ef185884da1e7d5344b301f48aa2ba0f88b6 (diff) | |
| download | cairo-7cfebce15228c88ee122edb8ba575f9a609e36f4.tar.gz | |
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 <abendstund@gmail.com>
Reviewed-by: Bryce Harrington <b.harrington@samsung.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=63310
| -rw-r--r-- | build/aclocal.float.m4 | 9 |
1 files 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 |