diff options
Diffstat (limited to 'security/nss/lib/util/verref.h')
| -rw-r--r-- | security/nss/lib/util/verref.h | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/security/nss/lib/util/verref.h b/security/nss/lib/util/verref.h new file mode 100644 index 0000000000..a7d5280e24 --- /dev/null +++ b/security/nss/lib/util/verref.h @@ -0,0 +1,43 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +/* This header is used inline in a function to ensure that a version string + * symbol is linked in and not optimized out. A volatile reference is added to + * the variable identified by NSS_VERSION_VARIABLE. + * + * Use this as follows: + * + * #define NSS_VERSION_VARIABLE __nss_ssl_version + * #include "verref.h" + */ + +/* Suppress unused variable warnings. */ +#ifdef _MSC_VER +#pragma warning(push) +#pragma warning(disable : 4101) +#endif +/* This works for both gcc and clang */ +#if defined(__GNUC__) && !defined(NSS_NO_GCC48) +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wunused-variable" +#endif + +#ifndef NSS_VERSION_VARIABLE +#error NSS_VERSION_VARIABLE must be set before including "verref.h" +#endif +{ + extern const char NSS_VERSION_VARIABLE[]; +#if defined(__GNUC__) || defined(__clang__) + __attribute__((unused)) +#endif + volatile const char _nss_version_c = NSS_VERSION_VARIABLE[0]; +} +#undef NSS_VERSION_VARIABLE + +#ifdef _MSC_VER +#pragma warning(pop) +#endif +#if defined(__GNUC__) && !defined(NSS_NO_GCC48) +#pragma GCC diagnostic pop +#endif |