is a general-purpose parser generator.
| threadlib.m4 (bison-3.8.1.tar.xz) | : | threadlib.m4 (bison-3.8.2.tar.xz) |
|---|
|
| # threadlib.m4 serial 31 | | # threadlib.m4 serial 32 |
| dnl Copyright (C) 2005-2021 Free Software Foundation, Inc. | | dnl Copyright (C) 2005-2021 Free Software Foundation, Inc. |
| dnl This file is free software; the Free Software Foundation | | dnl This file is free software; the Free Software Foundation |
| dnl gives unlimited permission to copy and/or distribute it, | | dnl gives unlimited permission to copy and/or distribute it, |
| dnl with or without modifications, as long as this notice is preserved. | | dnl with or without modifications, as long as this notice is preserved. |
| | |
| dnl From Bruno Haible. | | dnl From Bruno Haible. |
| | |
| AC_PREREQ([2.60]) | | AC_PREREQ([2.60]) |
| | |
| dnl The general structure of the multithreading modules in gnulib is that we | | dnl The general structure of the multithreading modules in gnulib is that we |
| | |
| skipping to change at line 87 | | skipping to change at line 87 |
|---|
| fi | | fi |
| ]) | | ]) |
| | |
| dnl Checks whether the compiler and linker support weak declarations of symbols. | | dnl Checks whether the compiler and linker support weak declarations of symbols. |
| | |
| AC_DEFUN([gl_WEAK_SYMBOLS], | | AC_DEFUN([gl_WEAK_SYMBOLS], |
| [ | | [ |
| AC_REQUIRE([AC_CANONICAL_HOST]) | | AC_REQUIRE([AC_CANONICAL_HOST]) |
| AC_CACHE_CHECK([whether imported symbols can be declared weak], | | AC_CACHE_CHECK([whether imported symbols can be declared weak], |
| [gl_cv_have_weak], | | [gl_cv_have_weak], |
|
| [gl_cv_have_weak=no | | [case "$host_os" in |
| dnl First, test whether the compiler accepts it syntactically. | | cygwin*) |
| AC_LINK_IFELSE( | | dnl On Cygwin 3.2.0 with gcc 10.2, the test below would succeed, but |
| [AC_LANG_PROGRAM( | | dnl programs that use pthread_in_use() with weak symbol references |
| [[extern void xyzzy (); | | dnl crash miserably at runtime. |
| | gl_cv_have_weak="guessing no" |
| | ;; |
| | *) |
| | gl_cv_have_weak=no |
| | dnl First, test whether the compiler accepts it syntactically. |
| | AC_LINK_IFELSE( |
| | [AC_LANG_PROGRAM( |
| | [[extern void xyzzy (); |
| #pragma weak xyzzy]], | | #pragma weak xyzzy]], |
|
| [[xyzzy();]])], | | [[xyzzy();]])], |
| [gl_cv_have_weak=maybe]) | | [gl_cv_have_weak=maybe]) |
| if test $gl_cv_have_weak = maybe; then | | if test $gl_cv_have_weak = maybe; then |
| dnl Second, test whether it actually works. On Cygwin 1.7.2, with | | dnl Second, test whether it actually works. On Cygwin 1.7.2, with |
| dnl gcc 4.3, symbols declared weak always evaluate to the address 0. | | dnl gcc 4.3, symbols declared weak always evaluate to the address 0. |
| AC_RUN_IFELSE( | | AC_RUN_IFELSE( |
| [AC_LANG_SOURCE([[ | | [AC_LANG_SOURCE([[ |
| #include <stdio.h> | | #include <stdio.h> |
| #pragma weak fputs | | #pragma weak fputs |
| int main () | | int main () |
| { | | { |
| return (fputs == NULL); | | return (fputs == NULL); |
| }]])], | | }]])], |
|
| [gl_cv_have_weak=yes], | | [gl_cv_have_weak=yes], |
| [gl_cv_have_weak=no], | | [gl_cv_have_weak=no], |
| [dnl When cross-compiling, assume that only ELF platforms support | | [dnl When cross-compiling, assume that only ELF platforms support |
| dnl weak symbols. | | dnl weak symbols. |
| AC_EGREP_CPP([Extensible Linking Format], | | AC_EGREP_CPP([Extensible Linking Format], |
| [#ifdef __ELF__ | | [#ifdef __ELF__ |
| Extensible Linking Format | | Extensible Linking Format |
| #endif | | #endif |
| ], | | ], |
| [gl_cv_have_weak="guessing yes"], | | [gl_cv_have_weak="guessing yes"], |
| [gl_cv_have_weak="guessing no"]) | | [gl_cv_have_weak="guessing no"]) |
| ]) | | ]) |
| fi | | fi |
| | ;; |
| | esac |
| dnl But when linking statically, weak symbols don't work. | | dnl But when linking statically, weak symbols don't work. |
| case " $LDFLAGS " in | | case " $LDFLAGS " in |
| *" -static "*) gl_cv_have_weak=no ;; | | *" -static "*) gl_cv_have_weak=no ;; |
| esac | | esac |
| dnl Test for a bug in FreeBSD 11: A link error occurs when using a weak | | dnl Test for a bug in FreeBSD 11: A link error occurs when using a weak |
| dnl symbol and linking against a shared library that has a dependency on | | dnl symbol and linking against a shared library that has a dependency on |
| dnl the shared library that defines the symbol. | | dnl the shared library that defines the symbol. |
| case "$gl_cv_have_weak" in | | case "$gl_cv_have_weak" in |
| *yes) | | *yes) |
| case "$host_os" in | | case "$host_os" in |
| | | |
| End of changes. 4 change blocks. |
|---|
| 26 lines changed or deleted | | 36 lines changed or added |
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