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Viktor Szakats 09073098c5 agent: list supported backends in libssh2_build_options()

Internally: make the agent backend guards unique for each backend, make
them contain the backend name. Use them in `agent.c`, move them to a
separate header and also reuse them from `version.c`.

Ref: https://github.com/libssh2/libssh2/pull/2285#discussion_r3572085858
Follow-up to 2673970d2a #2178

Closes #2312

2026-07-14 18:29:12 +02:00

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c, SPDX-License-Identifier, Title, Section, Source, See-also

SPDX-License-Identifier

Title

Section

Source

See-also

BSD-3-Clause

libssh2_build_options

libssh2

libssh2_crypto_engine(3)

libssh2_version(3)

NAME

libssh2_build_options - return build-time options

SYNOPSIS

#include <libssh2.h>

const char *libssh2_build_options(void);

DESCRIPTION

Return the full list of options available at build time, along with their enabled/disabled statuses.

RETURN VALUE

A read-only, space-separated list of key:value pairs describing build options. Options use on or off, except:

crypto, which reports one of these values: AWS-LC, BoringSSL, Libgcrypt, LibreSSL, mbedTLS, OpenSSL, OpenSSL/1.1.1, OS400QC3, WinCNG, wolfSSL.

agent, which is listed for each supported agent backend: Pageant (Windows-specific), OpenSSH (Windows-specific), Unix.

EXAMPLE

printf("libssh2 build options: %s", libssh2_build_options());

AVAILABILITY

Added in libssh2 1.12.0

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