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build: Add extensive docs on visibility issues

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Tim Ruffing 2023-06-27 15:22:44 +02:00 committed by Hennadii Stepanov
parent 0196e8ade1
commit 020bf69a44
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1 changed files with 9 additions and 1 deletions
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include/secp256k1.h
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@ -133,8 +133,14 @@ typedef int (*secp256k1_nonce_function)(
# define SECP256K1_NO_BUILD
#endif
/* Symbol visibility. See https://gcc.gnu.org/wiki/Visibility */
/* Symbol visibility. */
#if defined(_WIN32)
/* GCC for Windows (e.g., MinGW) accepts the __declspec syntax
* for MSVC compatibility. A __declspec declaration implies (but is not
* exactly equivalent to) __attribute__ ((visibility("default"))), and so we
* actually want __declspec even on GCC, see "Microsoft Windows Function
* Attributes" in the GCC manual and the recommendations in
* https://gcc.gnu.org/wiki/Visibility. */
# if defined(SECP256K1_BUILD)
# if defined(DLL_EXPORT) || defined(SECP256K1_DLL_EXPORT)
/* Building libsecp256k1 as a DLL.
@ -151,8 +157,10 @@ typedef int (*secp256k1_nonce_function)(
#endif
#ifndef SECP256K1_API
# if defined(__GNUC__) && (__GNUC__ >= 4) && defined(SECP256K1_BUILD)
/* Building libsecp256k1 on non-Windows using GCC or compatible. */
# define SECP256K1_API extern __attribute__ ((visibility ("default")))
# else
/* All cases not captured above. */
# define SECP256K1_API extern
# endif
#endif