curl-autotools.sh: workaround for arc4random + LibreSSL build bug [ci…

… skip]

curl/curl#12257
libressl/portable#928

curl-autotools.sh

@@ -156,7 +156,17 @@ _VER="$1"
  h3=1
  elif [ "${_OPENSSL}" = 'quictls' ] || [ "${_OPENSSL}" = 'libressl' ] || [ "${_OPENSSL}" = 'openssl' ]; then
  if [ "${_OS}" = 'win' ]; then
- [ "${_OPENSSL}" = 'libressl' ] && CPPFLAGS="${CPPFLAGS} -DLIBRESSL_DISABLE_OVERRIDE_WINCRYPT_DEFINES_WARNING"
+ if [ "${_OPENSSL}" = 'libressl' ]; then
+ CPPFLAGS="${CPPFLAGS} -DLIBRESSL_DISABLE_OVERRIDE_WINCRYPT_DEFINES_WARNING"
+ # Workaround for accidentally detecting 'arc4random' inside LibreSSL (as of
+ # v3.8.2) then failing to use it due to missing the necessary LibreSSL header,
+ # then using a non-C89 type in curl's local replacement declaration:
+ # ../../lib/rand.c:37:1: error: unknown type name 'uint32_t'
+ # 37 | uint32_t arc4random(void);
+ # | ^
+ # Issue: https://github.com/curl/curl/issues/12257
+ export ac_cv_func_arc4random='no'
+ fi
  LIBS="${LIBS} -lbcrypt" # for auto-detection
  fi
  [ "${_OPENSSL}" = 'openssl' ] || h3=1