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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2024-03-13 14:34:14 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2024-04-10 14:03:08 +0100 |
| commit | 1bf17ce978da71431dbd1fc3660cfae3dff0672f (patch) | |
| tree | c329ee2bbf0c8acff6cb1f3186fa815cb62a7ddb /sysdeps/aarch64/configure.ac | |
| parent | 168ae58e6e705a53a71850ee63ba5514fd5d7b70 (diff) | |
| download | glibc-1bf17ce978da71431dbd1fc3660cfae3dff0672f.tar.gz glibc-1bf17ce978da71431dbd1fc3660cfae3dff0672f.tar.xz glibc-1bf17ce978da71431dbd1fc3660cfae3dff0672f.zip | |
aarch64: fix check for SVE support in assembler
Due to GCC bug 110901 -mcpu can override -march setting when compiling asm code and thus a compiler targetting a specific cpu can fail the configure check even when binutils gas supports SVE. The workaround is that explicit .arch directive overrides both -mcpu and -march, and since that's what the actual SVE memcpy uses the configure check should use that too even if the GCC issue is fixed independently. Reviewed-by: Florian Weimer <fweimer@redhat.com> (cherry picked from commit 73c26018ed0ecd9c807bb363cc2c2ab4aca66a82)
Diffstat (limited to 'sysdeps/aarch64/configure.ac')
| -rw-r--r-- | sysdeps/aarch64/configure.ac | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac index 27874eceb4..56d12d661d 100644 --- a/sysdeps/aarch64/configure.ac +++ b/sysdeps/aarch64/configure.ac @@ -90,9 +90,10 @@ LIBC_CONFIG_VAR([aarch64-variant-pcs], [$libc_cv_aarch64_variant_pcs]) # Check if asm support armv8.2-a+sve AC_CACHE_CHECK([for SVE support in assembler], [libc_cv_aarch64_sve_asm], [dnl cat > conftest.s <<\EOF - ptrue p0.b + .arch armv8.2-a+sve + ptrue p0.b EOF -if AC_TRY_COMMAND(${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&AS_MESSAGE_LOG_FD); then +if AC_TRY_COMMAND(${CC-cc} -c conftest.s 1>&AS_MESSAGE_LOG_FD); then libc_cv_aarch64_sve_asm=yes else libc_cv_aarch64_sve_asm=no |