Message ID | 745fcb769f068bb7a99513197f64955e02e79558.1701967183.git.szabolcs.nagy@arm.com |
---|---|
State | Unresolved |
Headers |
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Series |
libgcc: aarch64: Add SME runtime
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Checks
Context | Check | Description |
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snail/gcc-patch-check | warning | Git am fail log |
Commit Message
Szabolcs Nagy
Dec. 7, 2023, 4:46 p.m. UTC
Add configure check for the __getauxval ABI symbol, which is always available on aarch64 glibc, and may be available on other linux C runtimes. For now only enabled on glibc, others have to override it target_configargs=libgcc_cv_have___getauxval=yes This is deliberately obscure as it should be auto detected, ideally via a feature test macro in unistd.h (link time detection is not possible since the libc may not be installed at libgcc build time), but currently there is no such feature test mechanism. Without __getauxval, libgcc cannot do runtime CPU feature detection and has to assume only the build time known features are available. libgcc/ChangeLog: * config.in: Undef HAVE___GETAUXVAL. * configure: Regenerate. * configure.ac: Check for __getauxval. --- libgcc/config.in | 3 +++ libgcc/configure | 26 ++++++++++++++++++++++++++ libgcc/configure.ac | 19 +++++++++++++++++++ 3 files changed, 48 insertions(+)
diff --git a/libgcc/config.in b/libgcc/config.in index 5dd96cdf648..441d4d39b95 100644 --- a/libgcc/config.in +++ b/libgcc/config.in @@ -16,6 +16,9 @@ /* Define to 1 if the assembler supports .variant_pcs. */ #undef HAVE_AS_VARIANT_PCS +/* Define to 1 if __getauxval is available. */ +#undef HAVE___GETAUXVAL + /* Define to 1 if the target assembler supports thread-local storage. */ #undef HAVE_CC_TLS diff --git a/libgcc/configure b/libgcc/configure index 571e3437701..746d29587d5 100755 --- a/libgcc/configure +++ b/libgcc/configure @@ -5657,6 +5657,32 @@ $as_echo "#define HAVE_AS_VARIANT_PCS 1" >>confdefs.h ;; esac +# Check __getauxval ABI symbol for CPU feature detection. +case ${target} in +aarch64*-linux-*) + # No link check because the libc may not be present. + { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __getauxval" >&5 +$as_echo_n "checking for __getauxval... " >&6; } +if ${libgcc_cv_have___getauxval+:} false; then : + $as_echo_n "(cached) " >&6 +else + case ${target} in + *-linux-gnu*) + libgcc_cv_have___getauxval=yes + ;; + *) + libgcc_cv_have___getauxval=no + esac +fi +{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgcc_cv_have___getauxval" >&5 +$as_echo "$libgcc_cv_have___getauxval" >&6; } + if test x$libgcc_cv_have___getauxval = xyes; then + +$as_echo "#define HAVE___GETAUXVAL 1" >>confdefs.h + + fi +esac + { $as_echo "$as_me:${as_lineno-$LINENO}: checking for init priority support" >&5 $as_echo_n "checking for init priority support... " >&6; } if ${libgcc_cv_init_priority+:} false; then : diff --git a/libgcc/configure.ac b/libgcc/configure.ac index abc398c91e4..64b45ae1423 100644 --- a/libgcc/configure.ac +++ b/libgcc/configure.ac @@ -665,6 +665,25 @@ aarch64*-*-*) esac]) LIBGCC_CHECK_AS_VARIANT_PCS +# Check __getauxval ABI symbol for CPU feature detection. +case ${target} in +aarch64*-linux-*) + # No link check because the libc may not be present. + AC_CACHE_CHECK([for __getauxval], + [libgcc_cv_have___getauxval], + [case ${target} in + *-linux-gnu*) + libgcc_cv_have___getauxval=yes + ;; + *) + libgcc_cv_have___getauxval=no + esac]) + if test x$libgcc_cv_have___getauxval = xyes; then + AC_DEFINE(HAVE___GETAUXVAL, 1, + [Define to 1 if __getauxval is available.]) + fi +esac + dnl Check if as supports RTM instructions. AC_CACHE_CHECK(for init priority support, libgcc_cv_init_priority, [ AC_COMPILE_IFELSE([AC_LANG_PROGRAM(,