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Add some notes about XLC, HP C, and Sun/Oracle C. 

Change-Id: I2f65face2aa7354ec350aed308402bb719bd619f
Reviewed-on: https://code.wireshark.org/review/17546
Reviewed-by: Guy Harris <guy@alum.mit.edu>
This commit is contained in:
Guy Harris 2016-09-06 20:51:23 -07:00
parent 5c38838432
commit 0495fc3bdd
1 changed files with 26 additions and 0 deletions
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26
CMakeLists.txt
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@ -349,10 +349,36 @@ else()
# Many modern compilers use c99 by default, but for older ones
# (like GCC 4.4.7), -std=gnu99 is required to avoid errors about
# use constructs like "for (int i = 0; i < n; i++) ;"
#
# Older versions of IBM XL C may require -qlanglvl=extc99.
# With V7.0, the "xlc" command defaults to C89; with 10.1,
# it defaults to C99 (both with IBM syntax extensions).
#
# HP's manual for HP C/HP-UX B.11.11.04 (the tenth
# edition of the manual), for PA-RISC, "documents
# new HP C features that support C99 industry standards".
# The manual for Version A.06.25 for Itanium mentions an
# -AC99 flag to support C99, but says it's the default;
# some older versions might require -AC99.
#
# As of Sun Studio 8, the compiler appears to default
# to supporting some C99 language features, but not
# C99 library differences from C89; -xc99 will give
# you both. The earlier Sun Forte Developer 6 update 2
# might or might not support thosee C99 language features
# by default, and doesn't speak of library differences;
# if it doesn't support the language features by default,
# -xc99 will support them.
#
if(CMAKE_C_COMPILER_ID MATCHES "GNU")
set(CMAKE_C_FLAGS "-std=gnu99 ${CMAKE_C_FLAGS}")
endif()
else()
#
# Current versions of CMake do not support options to
# request C99 for XL C, HP C, or Oracle C. (They may
# not be necessary for current versions.)
#
set(CMAKE_C_STANDARD 99)
endif()