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-rw-r--r--libstdc++-v3/configure.ac6
1 files changed, 6 insertions, 0 deletions
diff --git a/libstdc++-v3/configure.ac b/libstdc++-v3/configure.ac
index dd13b011f97..22fc840f68b 100644
--- a/libstdc++-v3/configure.ac
+++ b/libstdc++-v3/configure.ac
@@ -195,6 +195,12 @@ GLIBCXX_CHECK_S_ISREG_OR_S_IFREG
AC_CHECK_HEADERS(sys/uio.h)
GLIBCXX_CHECK_WRITEV
+# Check for fenv.h and complex.h before GLIBCXX_CHECK_C99_TR1
+# so that the check is done with the C compiler (not C++).
+# Checking with C++ can break a canadian cross build if either
+# file does not exist in C but does in C++.
+AC_CHECK_HEADERS(fenv.h complex.h)
+
# For C99 support to TR1.
GLIBCXX_CHECK_C99_TR1