diff options
Diffstat (limited to 'sysdeps/x86/configure.ac')
| -rw-r--r-- | sysdeps/x86/configure.ac | 76 |
1 files changed, 74 insertions, 2 deletions
diff --git a/sysdeps/x86/configure.ac b/sysdeps/x86/configure.ac index 031f917..a87e2f6 100644 --- a/sysdeps/x86/configure.ac +++ b/sysdeps/x86/configure.ac @@ -57,7 +57,7 @@ EOF libc_cv_include_x86_isa_level=no if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS -nostartfiles -nostdlib -r -o conftest conftest1.S conftest2.S); then count=`LC_ALL=C $READELF -n conftest | grep NT_GNU_PROPERTY_TYPE_0 | wc -l` - if test "$count" = 1; then + if test "$count" -eq 1; then libc_cv_include_x86_isa_level=yes fi fi @@ -117,12 +117,14 @@ else AC_DEFINE_UNQUOTED(MINIMUM_X86_ISA_LEVEL, $libc_cv_have_x86_isa_level) fi LIBC_CONFIG_VAR([have-x86-isa-level], [$libc_cv_have_x86_isa_level]) +LIBC_CONFIG_VAR([x86-isa-level-2-or-above], [2 3 4]) LIBC_CONFIG_VAR([x86-isa-level-3-or-above], [3 4]) +LIBC_CONFIG_VAR([x86-isa-level-4-or-above], [4]) LIBC_CONFIG_VAR([enable-x86-isa-level], [$libc_cv_include_x86_isa_level]) dnl Check if TEST_CC supports -mfpmath=387 LIBC_TRY_TEST_CC_OPTION([if -mfpmath=387 works], - [-c -Werror -mfpmath=387], + [-Werror -mfpmath=387], libc_cv_have_test_cc_cflags_mfpmath_387, [libc_cv_have_test_cc_cflags_mfpmath_387=yes], [libc_cv_have_test_cc_cflags_mfpmath_387=no] @@ -130,5 +132,75 @@ LIBC_TRY_TEST_CC_OPTION([if -mfpmath=387 works], LIBC_CONFIG_VAR(have-test-cc-cflags-mfpmath-387, $libc_cv_have_test_cc_cflags_mfpmath_387) +conftest_code=" +extern int foo; +int * +foo_p (void) +{ + return &foo; +} +" +dnl Check if CC enables no direct extern access by default. +LIBC_TRY_CC_COMMAND([if no direct extern access is enabled by default], + [$conftest_code], + [-S -O2 -fno-pic], + libc_cv_cc_no_direct_extern_access, + [ +libc_cv_cc_cflags_no_direct_extern_access=no +if test "$base_machine" = x86_64; then + if grep -E -q "mov[lq][ ]+foo@GOTPCREL\(%rip\)," conftest; then + libc_cv_cc_no_direct_extern_access=yes + fi +elif test "$base_machine" = i386; then + if grep -E -q "movl[ ]+foo@GOT," conftest; then + libc_cv_cc_no_direct_extern_access=yes + fi +else + echo unsupported machine: $base_machine + rm -f conftest* + exit 1 +fi + ], + [ +echo failed to check no direct external data access +rm -f conftest* +exit 1 +]) + +dnl Check if TEST_CC supports -mno-direct-extern-access. +LIBC_TRY_TEST_CC_OPTION([if -mno-direct-extern-access works], + [-Werror -mno-direct-extern-access], + libc_cv_test_cc_cflags_mno_direct_extern_access, + [libc_cv_test_cc_cflags_mno_direct_extern_access=yes], + [libc_cv_test_cc_cflags_mno_direct_extern_access=no] +) + +dnl Check if TEST_CC supports -fno-direct-access-external-data. +LIBC_TRY_TEST_CC_OPTION([if -fno-direct-access-external-data works], + [-Werror -fno-direct-access-external-data], + libc_cv_test_cc_cflags_fno_direct_access_external_data, + [libc_cv_test_cc_cflags_fno_direct_access_external_data=yes], + [libc_cv_test_cc_cflags_fno_direct_access_external_data=no] +) + +if test $libc_cv_test_cc_cflags_mno_direct_extern_access = yes; then + libc_cv_test_cc_cflags_no_direct_extern_access="-mno-direct-extern-access" +elif test $libc_cv_test_cc_cflags_fno_direct_access_external_data = yes; then + libc_cv_test_cc_cflags_no_direct_extern_access="-fno-direct-access-external-data" +fi + +LIBC_CONFIG_VAR(test-cc-cflags-no-direct-extern-access, + $libc_cv_test_cc_cflags_no_direct_extern_access) + +dnl If the building compiler enables no direct external data access by +dnl default, access to protected data in shared libraries from executables +dnl must be compiled with no direct external data access. If the testing +dnl compiler doesn't support it, set have-protected-data to no to disable +dnl the tests which requires no direct external data access. +dnl +if test "${libc_cv_cc_no_direct_extern_access}${libc_cv_test_cc_cflags_no_direct_extern_access}" = yes; then + libc_cv_protected_data=no +fi + dnl Static PIE is supported. AC_DEFINE(SUPPORT_STATIC_PIE) |