cmake: clear package version after pkg-config detection

`pkg_check_modules()` seems to leave `<PACKAGE>_VERSION` defined with an
empty value, if the package is not found.

When the package is also not found in the fallback branch,
`find_package_handle_standard_args()` logs and error message. In this
message it includes the bogus empty value as: `(found version "")`:
```
Could NOT find Libssh2 (missing: LIBSSH2_INCLUDE_DIR LIBSSH2_LIBRARY) (found version "")
```
https://github.com/curl/curl/actions/runs/11509727553/job/32040378958?pr=15408#step:31:99

Clear the version number to avoid the confusion:
```
Could NOT find Libssh2 (missing: LIBSSH2_INCLUDE_DIR LIBSSH2_LIBRARY)
```
https://github.com/curl/curl/actions/runs/11510022503/job/32041149129?pr=15408#step:31:99

Seen with CMake v3.30.5.

Follow-up to 7bab201abe #15193
Closes #15409
This commit is contained in:
Viktor Szakats 2024-10-25 03:01:58 +02:00
parent b8c12634fc
commit aafc074f87
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8 changed files with 8 additions and 0 deletions

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@ -51,6 +51,7 @@ else()
find_path(LIBIDN2_INCLUDE_DIR NAMES "idn2.h")
find_library(LIBIDN2_LIBRARY NAMES "idn2" "libidn2")
unset(LIBIDN2_VERSION CACHE)
if(LIBIDN2_INCLUDE_DIR AND EXISTS "${LIBIDN2_INCLUDE_DIR}/idn2.h")
set(_version_regex "#[\t ]*define[\t ]+IDN2_VERSION[\t ]+\"([^\"]*)\"")
file(STRINGS "${LIBIDN2_INCLUDE_DIR}/idn2.h" _version_str REGEX "${_version_regex}")