MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0015829CMakeModulespublic2015-11-03 06:122016-06-10 14:31
ReporterJulien Bigot 
Assigned ToKitware Robot 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionmoved 
PlatformOSDebianOS Versionunstable
Product VersionCMake 3.3.2 
Target VersionFixed in Version 
Summary0015829: GenerateExportHeaders does not work for C
DescriptionThis is a duplicate of issue 0012959 that has been closed as fixed but is not.

The module GenerateExportHeader creates some defines that work for C but it require C++ to be enabled in order to be used. Indeed, the macro check_cxx_compiler_flag is used in many places. That means you can't use project(name C).

A fix for this is proposed in comment 0035809 of issue 0014456
Steps To ReproduceThis example will not works:

project(mylib C)
include(GenerateExportHeader)

add_compiler_export_flags()
add_library(mylib mylib.c)
generate_export_header(mylib)


[...]
-- Performing Test COMPILER_HAS_HIDDEN_VISIBILITY
CMake Error at /usr/share/cmake-3.3/Modules/CheckCXXSourceCompiles.cmake:76 (try_compile):
  Unknown extension ".cxx" for file

    /[...]/CMakeFiles/CMakeTmp/src.cxx

  try_compile() works only for enabled languages. Currently these are:

    C

  See project() command to enable other languages.
Call Stack (most recent call first):
  /usr/share/cmake-3.3/Modules/CheckCXXCompilerFlag.cmake:50 (CHECK_CXX_SOURCE_COMPILES)
  /usr/share/cmake-3.3/Modules/GenerateExportHeader.cmake:223 (check_cxx_compiler_flag)
  /usr/share/cmake-3.3/Modules/GenerateExportHeader.cmake:371 (_test_compiler_hidden_visibility)
  CMakeLists.txt:6 (generate_export_header)
[...]
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Issue History
Date ModifiedUsernameFieldChange
2015-11-03 06:12Julien BigotNew Issue
2016-06-10 14:29Kitware RobotNote Added: 0042878
2016-06-10 14:29Kitware RobotStatusnew => resolved
2016-06-10 14:29Kitware RobotResolutionopen => moved
2016-06-10 14:29Kitware RobotAssigned To => Kitware Robot
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0042878)
Kitware Robot   
2016-06-10 14:29   
Resolving issue as `moved`.

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