Merge pull request #3144 from bluca/autoconf_taut

Problem: autoconf checks tautological compiler flag only for C++

Merge pull request #3144 from bluca/autoconf_taut
Problem: autoconf checks tautological compiler flag only for C++
0b8f586d · Simon Giesecke · GitHub · 088fd65b · 06eaf205 · 0b8f586d
Unverified Commit 0b8f586d authored May 30, 2018 by Simon Giesecke Committed by GitHub May 30, 2018
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configure.ac configure.ac +7 -1

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--- a/configure.ac
+++ b/configure.ac
@@ -813,8 +813,14 @@ AM_CONDITIONAL([WITH_CLANG_FORMAT], [$WITH_CLANG_FORMAT])
 AM_CONDITIONAL(ENABLE_STATIC, test "x$enable_static" = "xyes")

 # clang 6 has a warning that does not make sense on multi-platform code
+AC_LANG_PUSH([C])
 AX_CHECK_COMPILE_FLAG([-Wno-tautological-constant-compare],
-    [CFLAGS+=" -Wno-tautological-constant-compare" CXXFLAGS+=" -Wno-tautological-constant-compare"],
+    [CFLAGS+=" -Wno-tautological-constant-compare"],
+    [],
+    [-Werror])
+AC_LANG_POP([C])
+AX_CHECK_COMPILE_FLAG([-Wno-tautological-constant-compare],
+    [CXXFLAGS+=" -Wno-tautological-constant-compare"],
    [],
    [-Werror])