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-rw-r--r--ares/configure.ac36
1 files changed, 15 insertions, 21 deletions
diff --git a/ares/configure.ac b/ares/configure.ac
index 6aaf47896..d90d70b0c 100644
--- a/ares/configure.ac
+++ b/ares/configure.ac
@@ -160,11 +160,22 @@ case $host in
#
esac
-CURL_CHECK_DEF([__xlc__])
-if test "$curl_cv_have_def___xlc__" = "yes"; then
- dnl Force xlc to stop after the compilation phase, and not
- dnl generate object code file when compilation has errors.
+AC_MSG_CHECKING([whether we are using the IBM C compiler])
+CURL_CHECK_DEF([__IBMC__], [], [silent])
+if test "$curl_cv_have_def___IBMC__" = "yes"; then
+ AC_MSG_RESULT([yes])
+ dnl Ensure that compiler optimizations are always thread-safe.
+ CFLAGS="$CFLAGS -qthreaded"
+ dnl Disable type based strict aliasing optimizations, using worst
+ dnl case aliasing assumptions when compiling. Type based aliasing
+ dnl would restrict the lvalues that could be safely used to access
+ dnl a data object.
+ CFLAGS="$CFLAGS -qnoansialias"
+ dnl Force compiler to stop after the compilation phase, without
+ dnl generating an object code file when compilation has errors.
CFLAGS="$CFLAGS -qhalt=e"
+else
+ AC_MSG_RESULT([no])
fi
CURL_CHECK_COMPILER_HALT_ON_ERROR
@@ -429,23 +440,6 @@ if test "x$RECENTAIX" = "xyes"; then
AC_DEFINE(_THREAD_SAFE, 1, [define this if you need it to compile thread-safe code])
- dnl check if this is the IBM xlc compiler
- dnl Details thanks to => http://predef.sourceforge.net/
- AC_MSG_CHECKING([if this is the xlc compiler])
- AC_EGREP_CPP([^__xlC__], [__xlC__],
- dnl action if the text is found, this it has not been replaced by the
- dnl cpp
- XLC="no"
- AC_MSG_RESULT([no]),
- dnl the text was not found, it was replaced by the cpp
- XLC="yes"
- AC_MSG_RESULT([yes])
- CFLAGS="$CFLAGS -qthreaded"
- dnl AIX xlc has to have strict aliasing turned off. If not,
- dnl the optimizer assumes that pointers can only point to
- dnl an object of the same type.
- CFLAGS="$CFLAGS -qnoansialias"
- )
fi