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| author | Guy Harris <gharris@sonic.net> | 2022-07-10 14:47:46 -0700 |
|---|---|---|
| committer | Guy Harris <gharris@sonic.net> | 2022-07-10 14:47:46 -0700 |
| commit | d9af4e9fc6aea75780163348497c08f128bb8274 (patch) | |
| tree | 813861e47125a8c36388a92e6684d83fbfc30893 /CMakeLists.txt | |
| parent | 88c1b88f78b3caf7cb887a478dc8dac00e6e3acc (diff) | |
CMake: check for a usable YACC.
As we do in autotools, if we find YACC rather than Bison, check whether
it supports -V, to make sure it's Berkeley YACC not AT&T YACC.
Diffstat (limited to 'CMakeLists.txt')
| -rw-r--r-- | CMakeLists.txt | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/CMakeLists.txt b/CMakeLists.txt index 764e95da..fb545516 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -2118,6 +2118,25 @@ endif() if(YACC_EXECUTABLE MATCHES "byacc" OR YACC_EXECUTABLE MATCHES "yacc") # + # Make sure this is Berkeley YACC, not AT&T YACC; + # the latter doesn't support reentrant parsers. + # Run it with "-V"; that succeeds and reports the + # version number with Berkeley YACC, but will + # (probably) fail with various vendor flavors + # of AT&T YACC. + # + # Hopefully this also eliminates any versions + # of Berkeley YACC that don't support reentrant + # parsers, if there are any. + # + execute_process(COMMAND ${YACC_EXECUTABLE} -V OUTPUT_QUIET + RESULT_VARIABLE EXIT_STATUS) + if(NOT EXIT_STATUS EQUAL 0) + message(FATAL_ERROR "${YACC_EXECUTABLE} is insufficient to compile libpcap. +libpcap requires Bison, a newer version of Berkeley YACC with support +for reentrant parsers, or another YACC compatible with them.") + endif() + # # Berkeley YACC doesn't support "%define api.pure", so use # "%pure-parser". # |