Mercurial > hg > CbC > CbC_gcc
annotate config/tls.m4 @ 158:494b0b89df80 default tip
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| author | Shinji KONO <kono@ie.u-ryukyu.ac.jp> |
|---|---|
| date | Mon, 25 May 2020 18:13:55 +0900 |
| parents | 1830386684a0 |
| children |
| rev | line source |
|---|---|
| 0 | 1 dnl Check whether the target supports TLS. |
| 2 AC_DEFUN([GCC_CHECK_TLS], [ | |
|
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3 AC_REQUIRE([AC_CANONICAL_HOST]) |
| 0 | 4 GCC_ENABLE(tls, yes, [], [Use thread-local storage]) |
| 5 AC_CACHE_CHECK([whether the target supports thread-local storage], | |
| 6 gcc_cv_have_tls, [ | |
| 145 | 7 AC_RUN_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])], |
| 0 | 8 [dnl If the test case passed with dynamic linking, try again with |
| 9 dnl static linking, but only if static linking is supported (not | |
| 10 dnl on Solaris 10). This fails with some older Red Hat releases. | |
| 11 chktls_save_LDFLAGS="$LDFLAGS" | |
| 12 LDFLAGS="-static $LDFLAGS" | |
| 145 | 13 AC_LINK_IFELSE([AC_LANG_SOURCE([int main() { return 0; }])], |
| 14 [AC_RUN_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])], | |
|
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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15 [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no],[])], |
| 0 | 16 [gcc_cv_have_tls=yes]) |
| 17 LDFLAGS="$chktls_save_LDFLAGS" | |
| 18 if test $gcc_cv_have_tls = yes; then | |
| 19 dnl So far, the binutils and the compiler support TLS. | |
| 20 dnl Also check whether the libc supports TLS, i.e. whether a variable | |
| 21 dnl with __thread linkage has a different address in different threads. | |
| 22 dnl First, find the thread_CFLAGS necessary for linking a program that | |
| 23 dnl calls pthread_create. | |
| 24 chktls_save_CFLAGS="$CFLAGS" | |
| 25 thread_CFLAGS=failed | |
| 26 for flag in '' '-pthread' '-lpthread'; do | |
| 27 CFLAGS="$flag $chktls_save_CFLAGS" | |
| 28 AC_LINK_IFELSE( | |
| 29 [AC_LANG_PROGRAM( | |
| 30 [#include <pthread.h> | |
| 31 void *g(void *d) { return NULL; }], | |
| 32 [pthread_t t; pthread_create(&t,NULL,g,NULL);])], | |
| 33 [thread_CFLAGS="$flag"]) | |
| 34 if test "X$thread_CFLAGS" != Xfailed; then | |
| 35 break | |
| 36 fi | |
| 37 done | |
| 38 CFLAGS="$chktls_save_CFLAGS" | |
| 39 if test "X$thread_CFLAGS" != Xfailed; then | |
| 40 CFLAGS="$thread_CFLAGS $chktls_save_CFLAGS" | |
|
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41 dnl Test for an old glibc bug that violated the __thread property. |
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parents:
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42 dnl Use volatile to ensure the compiler won't optimize away pointer |
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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43 dnl accesses it might otherwise assume to be redundant, or reorder |
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44 dnl them and reuse storage, which might lead to them pointing to |
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45 dnl the same location. |
| 0 | 46 AC_RUN_IFELSE( |
| 47 [AC_LANG_PROGRAM( | |
| 48 [#include <pthread.h> | |
| 49 __thread int a; | |
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50 static int *volatile a_in_other_thread; |
| 0 | 51 static void * |
| 52 thread_func (void *arg) | |
| 53 { | |
| 54 a_in_other_thread = &a; | |
| 55 return (void *)0; | |
| 56 }], | |
| 57 [pthread_t thread; | |
| 58 void *thread_retval; | |
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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59 int *volatile a_in_main_thread; |
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
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60 a_in_main_thread = &a; |
| 0 | 61 if (pthread_create (&thread, (pthread_attr_t *)0, |
| 62 thread_func, (void *)0)) | |
| 63 return 0; | |
| 64 if (pthread_join (thread, &thread_retval)) | |
| 65 return 0; | |
| 66 return (a_in_other_thread == a_in_main_thread);])], | |
| 67 [gcc_cv_have_tls=yes], [gcc_cv_have_tls=no], []) | |
| 68 CFLAGS="$chktls_save_CFLAGS" | |
| 69 fi | |
| 70 fi], | |
| 71 [gcc_cv_have_tls=no], | |
| 72 [dnl This is the cross-compiling case. Assume libc supports TLS if the | |
| 73 dnl binutils and the compiler do. | |
| 145 | 74 AC_LINK_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])], |
|
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77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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75 [chktls_save_LDFLAGS="$LDFLAGS" |
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77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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76 dnl Shared library options may depend on the host; this check |
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parents:
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77 dnl is only known to be needed for GNU/Linux. |
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78 case $host in |
| 145 | 79 *-*-linux* | -*-uclinuxfdpic*) |
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80 LDFLAGS="-shared -Wl,--no-undefined $LDFLAGS" |
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81 ;; |
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82 esac |
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77e2b8dfacca
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ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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83 chktls_save_CFLAGS="$CFLAGS" |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
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diff
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84 CFLAGS="-fPIC $CFLAGS" |
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77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
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85 dnl If -shared works, test if TLS works in a shared library. |
| 145 | 86 AC_LINK_IFELSE([AC_LANG_SOURCE([int f() { return 0; }])], |
| 87 [AC_LINK_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int f() { return a = b; }])], | |
|
55
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
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88 [gcc_cv_have_tls=yes], |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
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89 [gcc_cv_have_tls=no])], |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
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90 [gcc_cv_have_tls=yes]) |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
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91 CFLAGS="$chktls_save_CFLAGS" |
|
77e2b8dfacca
update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
parents:
0
diff
changeset
|
92 LDFLAGS="$chktls_save_LDFLAGS"], [gcc_cv_have_tls=no]) |
| 0 | 93 ] |
| 94 )]) | |
| 95 if test "$enable_tls $gcc_cv_have_tls" = "yes yes"; then | |
| 96 AC_DEFINE(HAVE_TLS, 1, | |
| 97 [Define to 1 if the target supports thread-local storage.]) | |
| 98 fi]) | |
| 99 | |
| 100 dnl Check whether the target assembler supports TLS. | |
| 101 AC_DEFUN([GCC_CHECK_CC_TLS], [ | |
| 102 GCC_ENABLE(tls, yes, [], [Use thread-local storage]) | |
| 103 AC_CACHE_CHECK([whether the target assembler supports thread-local storage], | |
| 104 gcc_cv_have_cc_tls, [ | |
| 145 | 105 AC_COMPILE_IFELSE([AC_LANG_SOURCE([__thread int a; int b; int main() { return a = b; }])], |
| 0 | 106 [gcc_cv_have_cc_tls=yes], [gcc_cv_have_cc_tls=no])] |
| 107 )]) | |
| 108 if test "$enable_tls $gcc_cv_have_cc_tls" = "yes yes"; then | |
| 109 AC_DEFINE(HAVE_CC_TLS, 1, | |
| 110 [Define to 1 if the target assembler supports thread-local storage.]) | |
| 111 fi]) | |
| 112 | |
| 113 dnl Check whether TLS is emulated. | |
| 114 AC_DEFUN([GCC_CHECK_EMUTLS], [ | |
| 115 AC_CACHE_CHECK([whether the thread-local storage support is from emutls], | |
| 116 gcc_cv_use_emutls, [ | |
| 117 gcc_cv_use_emutls=no | |
| 118 echo '__thread int a; int b; int main() { return a = b; }' > conftest.c | |
| 119 if AC_TRY_COMMAND(${CC-cc} -Werror -S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD); then | |
| 120 if grep __emutls_get_address conftest.s > /dev/null; then | |
| 121 gcc_cv_use_emutls=yes | |
| 122 fi | |
| 123 fi | |
| 124 rm -f conftest.* | |
| 125 ]) | |
| 126 if test "$gcc_cv_use_emutls" = "yes" ; then | |
| 127 AC_DEFINE(USE_EMUTLS, 1, | |
| 128 [Define to 1 if the target use emutls for thread-local storage.]) | |
| 129 fi]) |