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Date Submitted

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0015829

CMake

Modules

public

2015-11-03 06:12

2016-06-10 14:31

Reporter

Julien Bigot

Assigned To

Kitware Robot

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

moved

Platform

Debian

OS Version

unstable

Product Version

CMake 3.3.2

Target Version

Fixed in Version

Summary

0015829: GenerateExportHeaders does not work for C

Description

This 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 Reproduce

This 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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Notes
(0042878) Kitware Robot (administrator) 2016-06-10 14:29	Resolving issue as `moved`. This issue tracker is no longer used. Further discussion of this issue may take place in the current CMake Issues page linked in the banner at the top of this page.

Issue History
Date Modified	Username	Field	Change
2015-11-03 06:12	Julien Bigot	New Issue
2016-06-10 14:29	Kitware Robot	Note Added: 0042878
2016-06-10 14:29	Kitware Robot	Status	new => resolved
2016-06-10 14:29	Kitware Robot	Resolution	open => moved
2016-06-10 14:29	Kitware Robot	Assigned To	=> Kitware Robot
2016-06-10 14:31	Kitware Robot	Status	resolved => closed