diff options
| author | João Valverde <j@v6e.pt> | 2021-09-21 18:54:55 +0100 |
|---|---|---|
| committer | Wireshark GitLab Utility <gerald+gitlab-utility@wireshark.org> | 2021-09-22 12:10:27 +0000 |
| commit | 5de2b5566356f8b2d41ed5a6b0f93c41d33cd2db (patch) | |
| tree | dafb2f4becea180a2bfc5a4596c3e52674e7c731 /ConfigureChecks.cmake | |
| parent | a2120e823c7274d9c4301a27f3805c877ae9ff65 (diff) | |
CMake: Check if vsnprinf() is C99-compliant
Diffstat (limited to 'ConfigureChecks.cmake')
| -rw-r--r-- | ConfigureChecks.cmake | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/ConfigureChecks.cmake b/ConfigureChecks.cmake index 1b8d28a695..328292e699 100644 --- a/ConfigureChecks.cmake +++ b/ConfigureChecks.cmake @@ -103,7 +103,31 @@ check_struct_has_member("struct tm" tm_zone time.h HAVE_STRUC #Symbols but NOT enums or types check_symbol_exists(tzname "time.h" HAVE_TZNAME) -# Check for stuff that isn't testable via the tests above +# +# Check if the libc vsnprintf() conforms to C99. If this fails we may +# need to fall-back on GLib I/O. +# +check_c_source_runs(" + #include <stdio.h> + int main(void) + { + /* Check that snprintf() and vsnprintf() don't return + * -1 if the buffer is too small. C99 says this value + * is the length that would be written not including + * the nul byte. */ + char buf[3]; + return snprintf(buf, sizeof(buf), \"%s\", \"ABCDEF\") > 0 ? 0 : 1; + }" + HAVE_C99_VSNPRINTF +) +if (NOT HAVE_C99_VSNPRINTF) + message(FATAL_ERROR +"Building Wireshark requires a C99 compliant vsnprintf() and this \ +target does not meet that requirement. Compiling for ${CMAKE_SYSTEM} \ +using ${CMAKE_C_COMPILER_ID}. Please report this issue to the Wireshark \ +developers at wireshark-dev@wireshark.org." + ) +endif() # # *If* we found libnl, check if we can use nl80211 stuff with it. |