46 lines
1.6 KiB
Diff
46 lines
1.6 KiB
Diff
From 3f6fc35cc28387e327cb6f47feb00061ed17b84c
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From: Mamoru TASAKA <mtasaka@fedoraproject.org>
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Date: Sat, 30 Apr 2022 13:32:34 +0900
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Subject: [PATCH] configure.ac: reset compiler flags before calling
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AC_CHECK_DECLS
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With autoconf 2.71, [AC_CHECK_DECLS] calls new internal macro
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[_AC_UNDECLARED_BUILTIN], which raises error with unknown compiler
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flag. On non-x86 archs, -mavx or so is not recognized, so configure
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fails on such architecture.
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To fix this, reset vector related compiler flags before calling
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AC_CHECK_DECLS.
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*OPENWRT EDIT: typo "sse_flags"
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---
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configure.ac | 16 ++++++++++++----
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1 file changed, 12 insertions(+), 4 deletions(-)
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--- a/configure.ac
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+++ b/configure.ac
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@@ -674,11 +674,19 @@ AC_CHECK_HEADERS([sys/types.h sys/un.h a
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save_cxxflags="${CXXFLAGS}"
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save_cppflags="${CPPFLAGS}"
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-CXXFLAGS="${CXXFLAGS} -msse3"
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-CPPFLAGS="${CPPFLAGS} -msse3"
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+sse3_flags="-msse3"
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+avx_flags="-mavx"
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+CXXFLAGS="${save_cxxflags} ${sse3_flags}"
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+CPPFLAGS="${save_cppflags} ${sse3_flags}"
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+AC_LINK_IFELSE([AC_LANG_PROGRAM([],)], [], [sse3_flags=""])
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+CXXFLAGS="${save_cxxflags} ${avx_flags}"
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+CPPFLAGS="${save_cppflags} ${avx_flags}"
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+AC_LINK_IFELSE([AC_LANG_PROGRAM([],)], [], [avx_flags=""])
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+CXXFLAGS="${save_cxxflags} ${sse3_flags}"
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+CXXFLAGS="${save_cxxflags} ${sse3_flags}"
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AC_CHECK_HEADERS([intrin.h x86intrin.h pmmintrin.h xmmintrin.h emmintrin.h])
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-CXXFLAGS="${save_cxxflags} -mavx"
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-CPPFLAGS="${save_cppflags} -mavx"
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+CXXFLAGS="${save_cxxflags} ${avx_flags}"
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+CPPFLAGS="${save_cppflags} ${avx_flags}"
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AC_CHECK_HEADERS([immintrin.h avxintrin.h])
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AC_CHECK_DECLS([_xgetbv, xgetbv, __xgetbv, cpuid, _cpuid, __cpuid],
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