Build: configure.ac: Use AS_IF and AS_CASE where required.

This makes no functional difference in the generated configure
(at least with the Autotools versions I have installed) but this
change might prevent future bugs like the one that was just
fixed in the commit 5a5bd7f871818029d5ccbe189f087f591258c294.

diff --git a/configure.ac b/configure.ac
index 535141f40f198ffb34ea39d5fe589ba339ede7de..440ec990d679968622d8b858af41572a4ab55548 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -816,7 +816,7 @@ TUKLIB_MBSTR
 sha256_header_found=no
 sha256_type_found=no
 sha256_func_found=no
-if test "x$enable_external_sha256" = "xyes"; then
+AS_IF([test "x$enable_external_sha256" = "xyes"], [
        # Test for Common Crypto before others, because Darwin has sha256.h
        # too and we don't want to use that, because on older versions it
        # uses OpenSSL functions, whose SHA256_Init is not guaranteed to
@@ -846,7 +846,7 @@ if test "x$enable_external_sha256" = "xyes"; then
                                [sha256_func_found=yes ; break])
                fi
        fi
-fi
+])
 AM_CONDITIONAL([COND_INTERNAL_SHA256], [test "x$sha256_func_found" = xno])
 if test "x$enable_external_sha256$sha256_func_found" = xyesno; then
        AC_MSG_ERROR([--enable-external-sha256 was specified but no supported external SHA-256 implementation was found])
@@ -865,11 +865,11 @@ AC_CHECK_DECL([_mm_movemask_epi8],
 #endif])
 
 # Check for sandbox support. If one is found, set enable_sandbox=found.
-case $enable_sandbox in
-       auto | capsicum)
+AS_CASE([$enable_sandbox],
+       [auto | capsicum], [
                AX_CHECK_CAPSICUM([enable_sandbox=found], [:])
-               ;;
-esac
+       ]
+)
 
 # If a specific sandboxing method was explicitly requested and it wasn't
 # found, give an error.
@@ -898,7 +898,7 @@ if test -n "$CFLAG_VISIBILITY" && test "$is_w32" = no; then
        AM_CFLAGS="$AM_CFLAGS $CFLAG_VISIBILITY"
 fi
 
-if test "$GCC" = yes ; then
+AS_IF([test "$GCC" = yes], [
        # Enable as much warnings as possible. These commented warnings won't
        # work for this package though:
        #   * -Wunreachable-code breaks several assert(0) cases, which are
@@ -954,7 +954,7 @@ if test "$GCC" = yes ; then
        if test "x$enable_werror" = "xyes"; then
                AM_CFLAGS="$AM_CFLAGS -Werror"
        fi
-fi
+])
 
 
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