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Build: Fix ARM64 CRC32 instruction feature test.
Old versions of Clang reported the unsupported function attribute and __crc32d() function as warnings instead of errors, so the feature test passed when it shouldn't have, causing a compile error at build time. -Werror was added to this feature test to fix this. The change is not needed for CMake because check_c_source_compiles() also performs linking and the error is caught then. Thanks to Sebastian Andrzej Siewior for reporting this.
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configure.ac
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configure.ac
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@ -1104,6 +1104,14 @@ AC_MSG_CHECKING([if ARM64 CRC32 instruction is usable])
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AS_IF([test "x$enable_arm64_crc32" = xno], [
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AC_MSG_RESULT([no, --disable-arm64-crc32 was used])
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], [
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# Set -Werror here because some versions of Clang (14 and older)
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# do not report the unsupported __attribute__((__target__("+crc")))
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# or __crc32d() as an error, only as a warning. This does not need
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# to be done with CMake because tests will attempt to link and the
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# error will be reported then.
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OLD_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Werror"
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AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
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#include <arm_acle.h>
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#include <stdint.h>
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@ -1124,6 +1132,8 @@ uint32_t my_crc(uint32_t a, uint64_t b)
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enable_arm64_crc32=no
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])
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AC_MSG_RESULT([$enable_arm64_crc32])
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CFLAGS="$OLD_CFLAGS"
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])
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# Check for ARM64 CRC32 instruction runtime detection.
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